闽西南基性岩脉中捕获锆石SIMS U-Pb年龄及Hf、O同位素特征

doi:10.11867/j.issn.1001-8166.2016.03.0320.

测定了闽西南地区5件基性岩脉的全岩主微量元素,锆石U-Pb年龄和Hf,O同位素。5件岩脉主要为辉绿岩,其全岩SiO₂含量为45%~53%,稀土元素显示轻稀土富集的右倾配分模式。基性岩脉中大部分锆石具明显振荡环带和扇状环带,为典型岩浆结晶锆石特征。锆石U-Pb年龄(96~2 400 Ma)分布较为分散。除少量锆石年龄(96~142 Ma)可能指示岩脉形成年龄外,其余均为捕获锆石。捕获锆石年龄主要分布在4个范围:早元古代(2 467~1 796 Ma),中晚元古代—震旦纪(1 343~647 Ma),志留纪—晚三叠世(427~225 Ma),晚侏罗世(159~140 Ma)。Hf-O同位素显示早元古代锆石来源于接近球粒陨石均一储库的地幔。中晚元古代以后年龄的锆石其Hf-O同位素均具有亏损地幔岩浆与地壳组分混合的特征;志留纪—晚侏罗世锆石主要来源于S型壳源花岗岩的重熔;早白垩世晚期的锆石ε_Hf(t) 值与δ¹⁸O值清晰地显示出亏损地幔与地壳岩浆混合的趋势。闽西南基性岩脉中锆石的二阶段Hf亏损地幔模式年龄(T_DM2)峰值主要分布在1.6~1.9 Ga,说明早元古代晚期幔源岩浆作用形成的基性岩地壳可能是形成后期花岗岩的主要源区。

关键词: SIMS锆石U-Pb测年, Hf-O同位素, 基性岩脉, 闽西南

The study in this paper determined whole rock major and trace elements, zircon U-Pb age and Hf, O isotopes of 5 mafic dikes in the southwestern Fujian province. The 5 dikes are mainly diabase and the whole rock SiO₂ content are between 45%~53%. Most zircons of the mafic dikes display obvious oscillatory zoning and fan-shaped zoning, and have the typical magmatic zircon crystallization characteristics. Zircon U-Pb age is dispersed with 96~2 400 Ma range. In addition to the minimum age (96~142 Ma) which might be the age of the formation of dikes, the remaining are captured zircon. The captured zircon age was mainly distributed in 4 groups: Early Proterozoic (2 467~1 796 Ma); Middle and late Proterozoic (1 343~647 Ma); Silurian to late Triassic Epoch (427~225 Ma); and Late Jurassic (159~140 Ma). Hf-O isotope shows that the early Proterozoic zircon was derived from the mantle of the homogeneous chondrite reservoir, and the others show magmatic mixing characteristics between depleted mantle and crust. Zircon’s ε_Hf(t) and δ¹⁸O of the early Late Cretaceous clearly show the mixing trend of depleted mantle and crustal magma. The peak of zircon Hf two-stage depleted mantle model age T_DM2 was mainly distributed in the 1.6~1.9 Ga. The Early Proterozoic mafic crust might be the main source for latter granite.

Key words: SIMS zircon U-Pb age, Hf-O isotopes, Mafic dikes, Southwestern Fujian.

中图分类号:

P588.12+4

图1 闽西南地区地质简图及基性岩脉采样位置 ^{[

4
]}

Fig.1 Geological sketch map of southwestern Fujian and mafic dikes’ sampling positions ^{[

4
]}

图2 闽西基性岩脉岩相学特征
Act.阳起石;Hy.紫苏辉石;Pl.斜长石

Fig.2 The petrographic characteristics of mafic dikes
Act.Actinolite; Hy.Hypersthene; Pl. Plagioclase

表1 闽西南基性岩脉岩石学特征

Table 1 Petrological characteristics of mafic dikes

样品号	采样位置	岩性	锆石数量	样品描述
YY-1	25°09'39.7″N, 116°22'54.9″E	紫苏辉绿岩	800	岩脉侵入到晚侏罗世二长花岗岩中,出露宽度约20 m。该岩石样品的结构不一致,以辉绿结构为主( 图2 a,b)。长石结晶程度较高,多呈柱状,粒径变化范围为0.1~1 mm,含量约占65%。辉石主要为紫苏辉石,结晶程度与其周围所布斜长石晶体特征有关。未蚀变的辉石其含量约占15%,蚀变后所生成的阳起石含量亦占15%左右。另可见少量的铁质分布,约占5%
SF-5	25°14'30.8″N, 116°25'59.9″E	强蚀变辉绿岩	>1 000	岩脉侵入到早白垩世晚期四坊岩体,出露宽度3~4 m,沿着裂隙见黄铁矿化。岩石深灰色,块状构造。镜下呈显微晶质结构。矿物的粒径均小于0.1 mm,其中,石英和长石难以区分鉴别,两者总体含量约为65%;薄片中还可见少量铁质,含量约为1%。岩石的裂隙十分发育,局部呈碎裂构造,沿着裂隙可见方解石脉、石英脉充填。表明岩石受过多期次的热液影响
SH-1	25°06'02.4″N, 116°28'58.2″E	辉绿岩	110	辉绿岩脉侵入到早白垩世花岗斑岩中,出露宽度约5 m。岩石呈辉绿结构。斜长石多为半自形的柱状( 图2 c,d),粒径主要为0.5~2 mm,聚片双晶常见,其含量约占65%;阳起石多为他形粒状,粒径主要在0.5~1 mm,正中突起,单偏光下呈浅绿色,含量在30%,为辉石或角闪石的次生矿物;铁质矿物含量在5%左右。薄片中未见原生石英颗粒,故而其原岩可能为辉长岩
SH-2	25°25'45.3″N, 116°45'41.3″E	辉绿岩	90	岩脉侵入到晚侏罗世石英二长岩中。岩石为辉绿结构。斜长石多为半自形的柱状颗粒,粒径主要在1~5 mm,聚片双晶的纹路间距较宽,表明这些斜长石偏基性,其含量约占70%;阳起石多为他形粒状,粒径为0.5~2 mm,正中突起,单偏光下呈浅褐色至浅绿色,含量在20%左右,为辉石或角闪石的次生矿物;铁质矿物含量在10%左右。该样品与SH-1岩性较为相似,但SH-2的原生矿物粒径较大一些,其蚀变程度也更强,铁质矿物含量也较高
MK-1	马坑铁矿300 m中段8号穿脉盲竖井车场附近	辉绿岩	53	岩脉侵入到晚侏罗世二长花岗岩中。岩石呈辉绿结构( 图2 e,f),斜长石结晶程度较好,呈柱状,粒径为1~2 mm,聚片双晶现象明显,含量约为45%;阳起石呈他形粒状、板状并充填于斜长石之间,解理发育,其含量约占45%;白云母主要呈片状、板状,含量约占5%;样品内可见较多的铁质矿物,含量约占5%,多呈他形粒状,为原矿物(辉石)在蚀变成阳起石过程中的伴生矿物

表1 闽西南基性岩脉岩石学特征

Table 1 Petrological characteristics of mafic dikes

样品号	采样位置	岩性	锆石数量	样品描述
YY-1	25°09'39.7″N, 116°22'54.9″E	紫苏辉绿岩	800	岩脉侵入到晚侏罗世二长花岗岩中,出露宽度约20 m。该岩石样品的结构不一致,以辉绿结构为主( 图2 a,b)。长石结晶程度较高,多呈柱状,粒径变化范围为0.1~1 mm,含量约占65%。辉石主要为紫苏辉石,结晶程度与其周围所布斜长石晶体特征有关。未蚀变的辉石其含量约占15%,蚀变后所生成的阳起石含量亦占15%左右。另可见少量的铁质分布,约占5%
SF-5	25°14'30.8″N, 116°25'59.9″E	强蚀变辉绿岩	>1 000	岩脉侵入到早白垩世晚期四坊岩体,出露宽度3~4 m,沿着裂隙见黄铁矿化。岩石深灰色,块状构造。镜下呈显微晶质结构。矿物的粒径均小于0.1 mm,其中,石英和长石难以区分鉴别,两者总体含量约为65%;薄片中还可见少量铁质,含量约为1%。岩石的裂隙十分发育,局部呈碎裂构造,沿着裂隙可见方解石脉、石英脉充填。表明岩石受过多期次的热液影响
SH-1	25°06'02.4″N, 116°28'58.2″E	辉绿岩	110	辉绿岩脉侵入到早白垩世花岗斑岩中,出露宽度约5 m。岩石呈辉绿结构。斜长石多为半自形的柱状( 图2 c,d),粒径主要为0.5~2 mm,聚片双晶常见,其含量约占65%;阳起石多为他形粒状,粒径主要在0.5~1 mm,正中突起,单偏光下呈浅绿色,含量在30%,为辉石或角闪石的次生矿物;铁质矿物含量在5%左右。薄片中未见原生石英颗粒,故而其原岩可能为辉长岩
SH-2	25°25'45.3″N, 116°45'41.3″E	辉绿岩	90	岩脉侵入到晚侏罗世石英二长岩中。岩石为辉绿结构。斜长石多为半自形的柱状颗粒,粒径主要在1~5 mm,聚片双晶的纹路间距较宽,表明这些斜长石偏基性,其含量约占70%;阳起石多为他形粒状,粒径为0.5~2 mm,正中突起,单偏光下呈浅褐色至浅绿色,含量在20%左右,为辉石或角闪石的次生矿物;铁质矿物含量在10%左右。该样品与SH-1岩性较为相似,但SH-2的原生矿物粒径较大一些,其蚀变程度也更强,铁质矿物含量也较高
MK-1	马坑铁矿300 m中段8号穿脉盲竖井车场附近	辉绿岩	53	岩脉侵入到晚侏罗世二长花岗岩中。岩石呈辉绿结构( 图2 e,f),斜长石结晶程度较好,呈柱状,粒径为1~2 mm,聚片双晶现象明显,含量约为45%;阳起石呈他形粒状、板状并充填于斜长石之间,解理发育,其含量约占45%;白云母主要呈片状、板状,含量约占5%;样品内可见较多的铁质矿物,含量约占5%,多呈他形粒状,为原矿物(辉石)在蚀变成阳起石过程中的伴生矿物

图3 主量元素硅碱图(据参考文献[20]修改)
Pc.苦橄玄武岩;B.玄武岩;O1.玄武安山岩;O2.安山岩;O3.英安岩;R.流纹岩;S1.粗面玄武岩;S2.玄武质粗面安山岩;S3.粗面安山岩;T.粗面岩、粗面英安岩;F.副长石岩;U1.碱玄岩、碧玄岩;U2.响岩质碱玄岩;U3.碱玄质响岩;Ph.响岩;Ir.Irvine分界线,上方为碱性,下方为亚碱性

Fig.3 Silicon vs. alkali diagram of major elements (modified after reference [20])
Pc.Picrite basalt; B.Basalt; O1.Basaltic andesite; O2.Andesite;O3.Dacite; R.Rhyolite; S1.Trachybasalt; S2.Basaltic trachyandesite;S3.Trachyandesite; T.Trachyte and trachydacite; F.Feldspathoidite;U1.Tephrite and basanite; U2.Phonolitic tephrite; U3.Tephriticphonolite; Ph.Phonolite; Ir.Irvine boundary, upper is alkali series, lower is subalkali series

表2 闽西南基性岩脉全岩主量(%)及微量(μg/g)元素组成

Table 2 Major (%) and trace (μg/g) elements of mafic dikes

样品	YY-1	SF-5	Sh-1	Sh-2	MK-1	样品	YY-1	SF-5	Sh-1	Sh-2	MK-1
SiO₂	50.5	53.5	50.9	45.8	48.4	Y	21.2	41.6	31.2	37.2	29.8
TiO₂	1.00	0.81	1.29	3.67	1.78	La	28.5	58.9	21.4	38.5	9.1
Al₂O₃	16.3	19.9	16.6	14.6	14.4	Ce	58.8	121.3	44.5	87.6	20.8
Fe₂O₃	4.79	1.56	1.87	4.33	2.43	Pr	7.55	13.69	5.78	11.75	3.04
FeO	3.00	5.43	6.97	10.75	9.77	Nd	29.9	49.3	23.8	51.3	14.3
MnO	0.13	0.17	0.20	0.21	0.38	Sm	5.67	8.49	5.36	10.43	4.04
MgO	6.81	4.31	5.86	4.77	7.49	Eu	1.69	1.95	1.63	4.49	1.41
CaO	7.92	2.93	10.01	7.37	9.23	Gd	4.66	7.59	4.91	8.88	3.95
Na₂O	2.84	2.15	2.87	2.98	1.95	Tb	0.76	1.25	0.96	1.45	0.87
K₂O	1.88	3.57	1.34	2.48	0.89	Dy	3.98	6.98	5.65	7.50	5.39
P₂O₅	0.26	0.14	0.15	0.93	0.15	Ho	0.83	1.53	1.24	1.51	1.20
H₂O⁺	3.80	4.24	1.18	1.14	2.00	Er	2.34	4.48	3.55	3.91	3.32
H₂O^-	1.98	0.24	0.08	0.04	0.13	Tm	0.36	0.74	0.57	0.55	0.54
灼失量	4.38	5.32	1.81	1.75	3.00	Yb	2.00	4.22	3.28	3.07	3.12
总和	99.81	99.78	99.88	99.61	99.79	Lu	0.43	0.64	0.47	0.53	0.42
Li	28.4	124.2	33.2	29.5	42.2	Mo	0.46	0.74	0.84	1.21	1.12
Be	1.57	4.80	0.97	1.68	1.56	Cd	0.10	0.05	0.07	0.36	0.07
Sc	27.5	25.8	33.6	32.8	59.8	In	0.07	0.15	0.16	0.11	0.15
V	177	152	195	283	346	Cs	4.10	11.25	6.16	27.00	7.03
Cr	200	110	235	27	112	Ba	623	924	233	1290	89
Co	29.2	21.3	31.5	46.2	43.0	Hf	4.99	4.42	5.23	6.22	7.24
Ni	103.5	57.0	79.4	30.3	69.9	Ta	0.75	1.80	0.93	1.52	0.90
Cu	21.8	13.9	63.4	48.2	31.8	W	0.32	6.43	0.63	0.34	10.74
Zn	85	116	107	168	105	Tl	0.16	0.76	0.50	0.51	0.90
Ga	20.8	32.4	21.4	26.7	24.3	Pb	11.0	16.7	13.4	63.2	5.5
Rb	51.2	166.5	86.3	85.3	98.0	Bi	0.02	0.25	0.54	0.07	0.18
Sr	632	200	316	520	386	Th	6.20	18.82	5.01	2.35	1.59
Zr	175	151	144	230	112	U	1.28	4.41	1.12	0.36	0.44
Nb	12.8	21.4	13.3	26.3	10.2	Ag	0.02	0.07	0.08	0.07	0.04

表2 闽西南基性岩脉全岩主量(%)及微量(μg/g)元素组成

Table 2 Major (%) and trace (μg/g) elements of mafic dikes

样品	YY-1	SF-5	Sh-1	Sh-2	MK-1	样品	YY-1	SF-5	Sh-1	Sh-2	MK-1
SiO₂	50.5	53.5	50.9	45.8	48.4	Y	21.2	41.6	31.2	37.2	29.8
TiO₂	1.00	0.81	1.29	3.67	1.78	La	28.5	58.9	21.4	38.5	9.1
Al₂O₃	16.3	19.9	16.6	14.6	14.4	Ce	58.8	121.3	44.5	87.6	20.8
Fe₂O₃	4.79	1.56	1.87	4.33	2.43	Pr	7.55	13.69	5.78	11.75	3.04
FeO	3.00	5.43	6.97	10.75	9.77	Nd	29.9	49.3	23.8	51.3	14.3
MnO	0.13	0.17	0.20	0.21	0.38	Sm	5.67	8.49	5.36	10.43	4.04
MgO	6.81	4.31	5.86	4.77	7.49	Eu	1.69	1.95	1.63	4.49	1.41
CaO	7.92	2.93	10.01	7.37	9.23	Gd	4.66	7.59	4.91	8.88	3.95
Na₂O	2.84	2.15	2.87	2.98	1.95	Tb	0.76	1.25	0.96	1.45	0.87
K₂O	1.88	3.57	1.34	2.48	0.89	Dy	3.98	6.98	5.65	7.50	5.39
P₂O₅	0.26	0.14	0.15	0.93	0.15	Ho	0.83	1.53	1.24	1.51	1.20
H₂O⁺	3.80	4.24	1.18	1.14	2.00	Er	2.34	4.48	3.55	3.91	3.32
H₂O^-	1.98	0.24	0.08	0.04	0.13	Tm	0.36	0.74	0.57	0.55	0.54
灼失量	4.38	5.32	1.81	1.75	3.00	Yb	2.00	4.22	3.28	3.07	3.12
总和	99.81	99.78	99.88	99.61	99.79	Lu	0.43	0.64	0.47	0.53	0.42
Li	28.4	124.2	33.2	29.5	42.2	Mo	0.46	0.74	0.84	1.21	1.12
Be	1.57	4.80	0.97	1.68	1.56	Cd	0.10	0.05	0.07	0.36	0.07
Sc	27.5	25.8	33.6	32.8	59.8	In	0.07	0.15	0.16	0.11	0.15
V	177	152	195	283	346	Cs	4.10	11.25	6.16	27.00	7.03
Cr	200	110	235	27	112	Ba	623	924	233	1290	89
Co	29.2	21.3	31.5	46.2	43.0	Hf	4.99	4.42	5.23	6.22	7.24
Ni	103.5	57.0	79.4	30.3	69.9	Ta	0.75	1.80	0.93	1.52	0.90
Cu	21.8	13.9	63.4	48.2	31.8	W	0.32	6.43	0.63	0.34	10.74
Zn	85	116	107	168	105	Tl	0.16	0.76	0.50	0.51	0.90
Ga	20.8	32.4	21.4	26.7	24.3	Pb	11.0	16.7	13.4	63.2	5.5
Rb	51.2	166.5	86.3	85.3	98.0	Bi	0.02	0.25	0.54	0.07	0.18
Sr	632	200	316	520	386	Th	6.20	18.82	5.01	2.35	1.59
Zr	175	151	144	230	112	U	1.28	4.41	1.12	0.36	0.44
Nb	12.8	21.4	13.3	26.3	10.2	Ag	0.02	0.07	0.08	0.07	0.04

图4 稀土(a)微量元素(b)标准化图解
闽北赤门晚白垩世角闪辉长岩,强不相容元素及Sr,Nd同位素显示富集岩石圈地幔源区特征 ^{[

19
]}; 球粒陨石及原始地幔值据参考文献[17]

Fig.4 Rare earth (a) trace element (b) standardized diagram
Late Cretaceous Chimen bojite in northern Fujian, strong incompatible element and Sr, Nd isotopes show characteristics of enriched lithospheric mantle source ^{[

19
]};The chondrite meteorites and the primitive mantle after reference[17]

表3 闽西南基性岩脉锆石 U/Pb 年龄组成

Table 3 Zircon U/Pb age of mafic dikes

点号	含量			比值					年龄
样品	U/ (μg/g)	Th/ (μg/g)	Th /U	²⁰⁷Pb /²⁰⁶Pb	±σ/ %	²⁰⁷Pb /²³⁵U	±σ/ %	²⁰⁶Pb /²³⁸U	±σ/ %	²⁰⁷Pb /²⁰⁶Pb	±σ/ %	²⁰⁷Pb /²³⁵U	±σ/ %	²⁰⁶Pb /²³⁸U	±σ/ %
YY-1@1	276	159	0.58	0.04972	1.68	0.16857	2.26	0.0246	1.51	181.8	38.6	158.2	3.3	156.6	2.3
YY-1@2	229	132	0.58	0.04859	2.07	0.16620	2.57	0.0248	1.51	127.9	48.1	156.1	3.7	158.0	2.4
YY-1@4	963	527	0.55	0.04759	1.26	0.10962	2.12	0.0167	1.71	79.1	29.6	105.6	2.1	106.8	1.8
YY-1@5	207	150	0.72	0.05033	1.47	0.17192	2.11	0.0248	1.51	210.2	33.7	161.1	3.1	157.8	2.4
YY-1@6	459	281	0.61	0.04870	1.31	0.16328	2.00	0.0243	1.51	133.5	30.6	153.6	2.9	154.9	2.3
YY-1@7	112	78	0.69	0.05068	2.21	0.17368	2.67	0.0249	1.50	226.1	50.2	162.6	4.0	158.3	2.3
YY-1@8	479	24	0.05	0.04827	1.21	0.11145	1.95	0.0167	1.53	112.3	28.4	107.3	2.0	107.1	1.6
YY-1@9	725	258	0.36	0.04885	0.94	0.16583	1.82	0.0246	1.56	140.8	21.9	155.8	2.6	156.8	2.4
YY-1@10	365	235	0.64	0.04815	1.57	0.16460	2.19	0.0248	1.52	106.6	36.8	154.7	3.1	157.9	2.4
YY-1@11	154	70	0.45	0.04861	1.87	0.14697	2.41	0.0219	1.52	129.0	43.4	139.2	3.1	139.8	2.1
YY-1@12	238	122	0.51	0.04863	2.14	0.16062	2.62	0.0240	1.51	130.1	49.7	151.2	3.7	152.6	2.3
YY-1@13	327	22	0.07	0.04919	1.45	0.11368	2.10	0.0168	1.52	156.8	33.7	109.3	2.2	107.2	1.6
YY-1@14	880	286	0.33	0.04913	0.89	0.16355	1.76	0.0241	1.52	154.2	20.6	153.8	2.5	153.8	2.3
YY-1@15	206	138	0.67	0.04949	1.64	0.17025	2.23	0.0249	1.51	171.3	37.9	159.6	3.3	158.9	2.4
SF-5@1	338	158	0.47	0.08318	0.59	2.53884	1.62	0.2214	1.51	1 273.4	11.4	1 283.2	11.8	1 289.1	17.6
SF-5@2	476	271	0.57	0.04745	2.26	0.09974	2.72	0.0152	1.52	72.0	52.8	96.5	2.5	97.5	1.5
SF-5@3	573	64	0.11	0.07586	0.36	1.93274	1.56	0.1848	1.52	1 091.3	7.2	1 092.5	10.5	1 093.1	15.3
SF-5@4	428	630	1.47	0.07892	0.37	2.18154	1.55	0.2005	1.50	1 170.2	7.2	1 175.2	10.8	1 177.9	16.2
SF-5@5	1 148	372	0.32	0.06228	0.39	0.97977	1.55	0.1141	1.50	683.9	8.4	693.5	7.8	696.4	9.9
SF-5@6	495	102	0.21	0.07591	0.40	1.93906	1.56	0.1853	1.51	1 092.7	8.0	1 094.7	10.5	1 095.7	15.2
SF-5@7	419	243	0.58	0.08348	0.36	2.48669	1.54	0.2161	1.50	1 280.4	7.0	1 268.2	11.2	1 261.0	17.2
SF-5@9	634	351	0.55	0.15848	0.28	9.85425	1.53	0.4510	1.50	2 439.5	4.8	2 421.2	14.2	2 399.6	30.1
SF-5@10	654	262	0.40	0.07318	0.35	1.72979	1.54	0.1714	1.50	1 019.0	7.0	1 019.7	10.0	1 020.0	14.2
SF-5@11	341	146	0.43	0.07555	0.63	1.91387	1.63	0.1837	1.50	1 083.2	12.6	1 085.9	10.9	1 087.3	15.1
SF-5@12	1 487	624	0.42	0.06055	0.38	0.88177	1.75	0.1056	1.71	623.5	8.3	641.9	8.4	647.2	10.5
SF-5@13	1 649	933	0.57	0.07142	0.27	1.60534	1.53	0.1630	1.50	969.5	5.5	972.3	9.6	973.5	13.6
SF-5@14	278	162	0.58	0.06306	0.67	0.99840	1.65	0.1148	1.51	710.1	14.2	703.0	8.4	700.8	10.0
SF-5@15	1 000	795	0.79	0.07612	0.34	1.94049	1.54	0.1849	1.50	1 098.2	6.9	1 095.2	10.4	1 093.7	15.1
SH-1@1	228	306	1.34	0.04962	1.69	0.15645	2.26	0.0229	1.50	177.3	39.0	147.6	3.1	145.8	2.2
SH-1@2	242	120	0.49	0.04788	2.53	0.10078	2.95	0.0153	1.51	93.4	58.8	97.5	2.7	97.7	1.5
SH-1@3	619	341	0.55	0.04888	1.05	0.11643	1.92	0.0173	1.61	142.1	24.5	111.8	2.0	110.4	1.8
SH-1@4	483	280	0.58	0.04878	1.66	0.11753	2.30	0.0175	1.59	137.4	38.4	112.8	2.5	111.7	1.8
SH-1@5	355	236	0.67	0.05133	0.95	0.25182	1.79	0.0356	1.52	255.5	21.6	228.1	3.7	225.4	3.4
SH-1@6	325	53	0.16	0.07717	0.44	2.00244	1.57	0.1882	1.51	1 125.6	8.8	1 116.3	10.7	1 111.6	15.4
SH-1@7	159	119	0.75	0.05063	2.60	0.25403	3.01	0.0364	1.51	224.0	59.1	229.8	6.2	230.4	3.4
SH-1@8	255	150	0.59	0.08330	0.36	2.50036	1.55	0.2177	1.50	1 276.2	7.1	1 272.1	11.3	1 269.7	17.3
SH-1@9	539	385	0.71	0.04970	1.49	0.16790	2.12	0.0245	1.51	181.1	34.3	157.6	3.1	156.0	2.3
SH-1@10	579	459	0.79	0.04708	2.30	0.14201	2.76	0.0219	1.53	53.4	53.9	134.8	3.5	139.5	2.1
SH-1@12	170	128	0.75	0.07336	1.32	1.74233	2.01	0.1723	1.51	1 023.9	26.5	1 024.3	13.0	1 024.5	14.3
SH-1@13	1 552	1 842	1.19	0.04793	1.21	0.15483	1.92	0.0234	1.50	95.7	28.3	146.2	2.6	149.3	2.2
SH-1@14	186	81	0.44	0.05296	1.51	0.49950	2.13	0.0684	1.50	327.3	33.9	411.4	7.2	426.5	6.2
SH-2@1	980	846	0.86	0.04647	1.73	0.10071	2.30	0.0157	1.51	22.1	41.0	97.4	2.1	100.5	1.5
SH-2@4	434	414	0.95	0.04842	1.34	0.10013	2.02	0.0150	1.51	120.0	31.3	96.9	1.9	96.0	1.4
SH-2@9	787	916	1.16	0.04995	0.78	0.17133	1.70	0.0249	1.51	192.6	18.0	160.6	2.5	158.4	2.4
SH-2@10	455	238	0.52	0.04778	1.55	0.11258	2.24	0.0171	1.61	88.5	36.4	108.3	2.3	109.2	1.7
SH-2@11	281	298	1.06	0.05047	1.32	0.17226	2.01	0.0248	1.51	216.7	30.3	161.4	3.0	157.6	2.4
SH-2@13	760	842	1.11	0.04460	2.09	0.09428	2.58	0.0153	1.51	-77.5	50.3	91.5	2.3	98.1	1.5
SH-2@14	1 034	2 087	2.02	0.04769	1.51	0.10501	2.14	0.0160	1.52	83.7	35.3	101.4	2.1	102.1	1.5
SH-2@15	397	179	0.45	0.08625	0.36	2.68155	1.54	0.2255	1.50	1 343.8	6.9	1 323.4	11.5	1 310.8	17.8
MK-1@1	729	351	0.48	0.13473	0.25	7.21785	1.52	0.3885	1.50	2 160.5	4.4	2 138.7	13.7	2 116.1	27.1
MK-1@2	416	282	0.68	0.04954	1.15	0.15034	1.90	0.0220	1.51	173.4	26.6	142.2	2.5	140.4	2.1
MK-1@3	794	413	0.52	0.15012	0.25	9.06767	1.52	0.4381	1.50	2 347.3	4.2	2 344.9	14.0	2 342.0	29.6
MK-1@4	250	189	0.76	0.12395	0.64	5.91163	1.63	0.3459	1.50	2 013.9	11.2	1 962.9	14.3	1 915.0	25.0
MK-1@5	384	173	0.45	0.05134	1.24	0.28846	1.95	0.0407	1.50	256.2	28.2	257.3	4.4	257.5	3.8
MK-1@6	100	105	1.05	0.12633	0.40	6.24081	1.55	0.3583	1.50	2 047.6	7.0	2 010.2	13.7	1 974.0	25.6
MK-1@8	80	41	0.51	0.11961	0.61	5.71955	1.63	0.3468	1.51	1 950.4	10.8	1 934.3	14.1	1 919.3	25.1
MK-1@9	683	307	0.45	0.12229	0.29	5.98532	1.53	0.3550	1.50	1 989.9	5.2	1 973.7	13.4	1 958.3	25.4
MK-1@10	620	153	0.25	0.11446	0.47	5.13954	1.57	0.3257	1.50	1 871.4	8.4	1 842.7	13.5	1 817.3	23.9
MK-1@11	14	2	0.11	0.12222	1.44	5.85915	2.08	0.3477	1.50	1 988.8	25.4	1 955.2	18.2	1 923.6	25.0
MK-1@12	736	283	0.38	0.05168	1.18	0.30197	1.91	0.0424	1.50	271.2	26.8	267.9	4.5	267.6	3.9
MK-1@13	646	916	1.42	0.16109	0.13	9.46211	1.51	0.4260	1.50	2 467.1	2.2	2 383.9	13.9	2 287.7	29.0
MK-1@14	154	119	0.77	0.10979	0.49	4.79047	1.58	0.3164	1.50	1 796.0	9.0	1 783.2	13.4	1 772.3	23.3
MK-1@15	696	393	0.56	0.13742	0.59	7.55371	1.65	0.3987	1.54	2 195.0	10.2	2 179.4	14.9	2 162.9	28.4
MK-1@16	716	112	0.16	0.12149	0.39	5.92494	1.56	0.3537	1.51	1 978.3	7.0	1 964.9	13.7	1 952.2	25.5

表3 闽西南基性岩脉锆石 U/Pb 年龄组成

Table 3 Zircon U/Pb age of mafic dikes

点号	含量			比值					年龄
样品	U/ (μg/g)	Th/ (μg/g)	Th /U	²⁰⁷Pb /²⁰⁶Pb	±σ/ %	²⁰⁷Pb /²³⁵U	±σ/ %	²⁰⁶Pb /²³⁸U	±σ/ %	²⁰⁷Pb /²⁰⁶Pb	±σ/ %	²⁰⁷Pb /²³⁵U	±σ/ %	²⁰⁶Pb /²³⁸U	±σ/ %
YY-1@1	276	159	0.58	0.04972	1.68	0.16857	2.26	0.0246	1.51	181.8	38.6	158.2	3.3	156.6	2.3
YY-1@2	229	132	0.58	0.04859	2.07	0.16620	2.57	0.0248	1.51	127.9	48.1	156.1	3.7	158.0	2.4
YY-1@4	963	527	0.55	0.04759	1.26	0.10962	2.12	0.0167	1.71	79.1	29.6	105.6	2.1	106.8	1.8
YY-1@5	207	150	0.72	0.05033	1.47	0.17192	2.11	0.0248	1.51	210.2	33.7	161.1	3.1	157.8	2.4
YY-1@6	459	281	0.61	0.04870	1.31	0.16328	2.00	0.0243	1.51	133.5	30.6	153.6	2.9	154.9	2.3
YY-1@7	112	78	0.69	0.05068	2.21	0.17368	2.67	0.0249	1.50	226.1	50.2	162.6	4.0	158.3	2.3
YY-1@8	479	24	0.05	0.04827	1.21	0.11145	1.95	0.0167	1.53	112.3	28.4	107.3	2.0	107.1	1.6
YY-1@9	725	258	0.36	0.04885	0.94	0.16583	1.82	0.0246	1.56	140.8	21.9	155.8	2.6	156.8	2.4
YY-1@10	365	235	0.64	0.04815	1.57	0.16460	2.19	0.0248	1.52	106.6	36.8	154.7	3.1	157.9	2.4
YY-1@11	154	70	0.45	0.04861	1.87	0.14697	2.41	0.0219	1.52	129.0	43.4	139.2	3.1	139.8	2.1
YY-1@12	238	122	0.51	0.04863	2.14	0.16062	2.62	0.0240	1.51	130.1	49.7	151.2	3.7	152.6	2.3
YY-1@13	327	22	0.07	0.04919	1.45	0.11368	2.10	0.0168	1.52	156.8	33.7	109.3	2.2	107.2	1.6
YY-1@14	880	286	0.33	0.04913	0.89	0.16355	1.76	0.0241	1.52	154.2	20.6	153.8	2.5	153.8	2.3
YY-1@15	206	138	0.67	0.04949	1.64	0.17025	2.23	0.0249	1.51	171.3	37.9	159.6	3.3	158.9	2.4
SF-5@1	338	158	0.47	0.08318	0.59	2.53884	1.62	0.2214	1.51	1 273.4	11.4	1 283.2	11.8	1 289.1	17.6
SF-5@2	476	271	0.57	0.04745	2.26	0.09974	2.72	0.0152	1.52	72.0	52.8	96.5	2.5	97.5	1.5
SF-5@3	573	64	0.11	0.07586	0.36	1.93274	1.56	0.1848	1.52	1 091.3	7.2	1 092.5	10.5	1 093.1	15.3
SF-5@4	428	630	1.47	0.07892	0.37	2.18154	1.55	0.2005	1.50	1 170.2	7.2	1 175.2	10.8	1 177.9	16.2
SF-5@5	1 148	372	0.32	0.06228	0.39	0.97977	1.55	0.1141	1.50	683.9	8.4	693.5	7.8	696.4	9.9
SF-5@6	495	102	0.21	0.07591	0.40	1.93906	1.56	0.1853	1.51	1 092.7	8.0	1 094.7	10.5	1 095.7	15.2
SF-5@7	419	243	0.58	0.08348	0.36	2.48669	1.54	0.2161	1.50	1 280.4	7.0	1 268.2	11.2	1 261.0	17.2
SF-5@9	634	351	0.55	0.15848	0.28	9.85425	1.53	0.4510	1.50	2 439.5	4.8	2 421.2	14.2	2 399.6	30.1
SF-5@10	654	262	0.40	0.07318	0.35	1.72979	1.54	0.1714	1.50	1 019.0	7.0	1 019.7	10.0	1 020.0	14.2
SF-5@11	341	146	0.43	0.07555	0.63	1.91387	1.63	0.1837	1.50	1 083.2	12.6	1 085.9	10.9	1 087.3	15.1
SF-5@12	1 487	624	0.42	0.06055	0.38	0.88177	1.75	0.1056	1.71	623.5	8.3	641.9	8.4	647.2	10.5
SF-5@13	1 649	933	0.57	0.07142	0.27	1.60534	1.53	0.1630	1.50	969.5	5.5	972.3	9.6	973.5	13.6
SF-5@14	278	162	0.58	0.06306	0.67	0.99840	1.65	0.1148	1.51	710.1	14.2	703.0	8.4	700.8	10.0
SF-5@15	1 000	795	0.79	0.07612	0.34	1.94049	1.54	0.1849	1.50	1 098.2	6.9	1 095.2	10.4	1 093.7	15.1
SH-1@1	228	306	1.34	0.04962	1.69	0.15645	2.26	0.0229	1.50	177.3	39.0	147.6	3.1	145.8	2.2
SH-1@2	242	120	0.49	0.04788	2.53	0.10078	2.95	0.0153	1.51	93.4	58.8	97.5	2.7	97.7	1.5
SH-1@3	619	341	0.55	0.04888	1.05	0.11643	1.92	0.0173	1.61	142.1	24.5	111.8	2.0	110.4	1.8
SH-1@4	483	280	0.58	0.04878	1.66	0.11753	2.30	0.0175	1.59	137.4	38.4	112.8	2.5	111.7	1.8
SH-1@5	355	236	0.67	0.05133	0.95	0.25182	1.79	0.0356	1.52	255.5	21.6	228.1	3.7	225.4	3.4
SH-1@6	325	53	0.16	0.07717	0.44	2.00244	1.57	0.1882	1.51	1 125.6	8.8	1 116.3	10.7	1 111.6	15.4
SH-1@7	159	119	0.75	0.05063	2.60	0.25403	3.01	0.0364	1.51	224.0	59.1	229.8	6.2	230.4	3.4
SH-1@8	255	150	0.59	0.08330	0.36	2.50036	1.55	0.2177	1.50	1 276.2	7.1	1 272.1	11.3	1 269.7	17.3
SH-1@9	539	385	0.71	0.04970	1.49	0.16790	2.12	0.0245	1.51	181.1	34.3	157.6	3.1	156.0	2.3
SH-1@10	579	459	0.79	0.04708	2.30	0.14201	2.76	0.0219	1.53	53.4	53.9	134.8	3.5	139.5	2.1
SH-1@12	170	128	0.75	0.07336	1.32	1.74233	2.01	0.1723	1.51	1 023.9	26.5	1 024.3	13.0	1 024.5	14.3
SH-1@13	1 552	1 842	1.19	0.04793	1.21	0.15483	1.92	0.0234	1.50	95.7	28.3	146.2	2.6	149.3	2.2
SH-1@14	186	81	0.44	0.05296	1.51	0.49950	2.13	0.0684	1.50	327.3	33.9	411.4	7.2	426.5	6.2
SH-2@1	980	846	0.86	0.04647	1.73	0.10071	2.30	0.0157	1.51	22.1	41.0	97.4	2.1	100.5	1.5
SH-2@4	434	414	0.95	0.04842	1.34	0.10013	2.02	0.0150	1.51	120.0	31.3	96.9	1.9	96.0	1.4
SH-2@9	787	916	1.16	0.04995	0.78	0.17133	1.70	0.0249	1.51	192.6	18.0	160.6	2.5	158.4	2.4
SH-2@10	455	238	0.52	0.04778	1.55	0.11258	2.24	0.0171	1.61	88.5	36.4	108.3	2.3	109.2	1.7
SH-2@11	281	298	1.06	0.05047	1.32	0.17226	2.01	0.0248	1.51	216.7	30.3	161.4	3.0	157.6	2.4
SH-2@13	760	842	1.11	0.04460	2.09	0.09428	2.58	0.0153	1.51	-77.5	50.3	91.5	2.3	98.1	1.5
SH-2@14	1 034	2 087	2.02	0.04769	1.51	0.10501	2.14	0.0160	1.52	83.7	35.3	101.4	2.1	102.1	1.5
SH-2@15	397	179	0.45	0.08625	0.36	2.68155	1.54	0.2255	1.50	1 343.8	6.9	1 323.4	11.5	1 310.8	17.8
MK-1@1	729	351	0.48	0.13473	0.25	7.21785	1.52	0.3885	1.50	2 160.5	4.4	2 138.7	13.7	2 116.1	27.1
MK-1@2	416	282	0.68	0.04954	1.15	0.15034	1.90	0.0220	1.51	173.4	26.6	142.2	2.5	140.4	2.1
MK-1@3	794	413	0.52	0.15012	0.25	9.06767	1.52	0.4381	1.50	2 347.3	4.2	2 344.9	14.0	2 342.0	29.6
MK-1@4	250	189	0.76	0.12395	0.64	5.91163	1.63	0.3459	1.50	2 013.9	11.2	1 962.9	14.3	1 915.0	25.0
MK-1@5	384	173	0.45	0.05134	1.24	0.28846	1.95	0.0407	1.50	256.2	28.2	257.3	4.4	257.5	3.8
MK-1@6	100	105	1.05	0.12633	0.40	6.24081	1.55	0.3583	1.50	2 047.6	7.0	2 010.2	13.7	1 974.0	25.6
MK-1@8	80	41	0.51	0.11961	0.61	5.71955	1.63	0.3468	1.51	1 950.4	10.8	1 934.3	14.1	1 919.3	25.1
MK-1@9	683	307	0.45	0.12229	0.29	5.98532	1.53	0.3550	1.50	1 989.9	5.2	1 973.7	13.4	1 958.3	25.4
MK-1@10	620	153	0.25	0.11446	0.47	5.13954	1.57	0.3257	1.50	1 871.4	8.4	1 842.7	13.5	1 817.3	23.9
MK-1@11	14	2	0.11	0.12222	1.44	5.85915	2.08	0.3477	1.50	1 988.8	25.4	1 955.2	18.2	1 923.6	25.0
MK-1@12	736	283	0.38	0.05168	1.18	0.30197	1.91	0.0424	1.50	271.2	26.8	267.9	4.5	267.6	3.9
MK-1@13	646	916	1.42	0.16109	0.13	9.46211	1.51	0.4260	1.50	2 467.1	2.2	2 383.9	13.9	2 287.7	29.0
MK-1@14	154	119	0.77	0.10979	0.49	4.79047	1.58	0.3164	1.50	1 796.0	9.0	1 783.2	13.4	1 772.3	23.3
MK-1@15	696	393	0.56	0.13742	0.59	7.55371	1.65	0.3987	1.54	2 195.0	10.2	2 179.4	14.9	2 162.9	28.4
MK-1@16	716	112	0.16	0.12149	0.39	5.92494	1.56	0.3537	1.51	1 978.3	7.0	1 964.9	13.7	1 952.2	25.5

图5 锆石的U-Pb年龄谱图和阴极发光(CL)图像
CL图像中白色圆代表U/Pb定年和Hf-O同位素分析的位置,数字表示U/Pb年龄/ε _Hf( t)值/δ ¹⁸O值

Fig.5 Zircon U-Pb age spectra and cathode luminescence (CL) images
White circle represents the analysis location of Hf-O and U/Pb isotopes in the CL image, the digital means U/Pb age/ε _Hf( t)/δ ¹⁸O values

图6 基性岩脉锆石中δ ¹⁸O值正态分布图

Fig.6 Normal distribution of δ ¹⁸O values in zircon

表4 闽西南基性岩脉锆石O同位素组成 ^*

Table 4 Zircon O isotopes of mafic dikes

样品	δ¹⁸O	σ	样品	δ¹⁸O	σ	样品	δ¹⁸O	σ	样品	¹⁸O	σ	样品	δ¹⁸O	σ
YY-1@1	8.24	0.30	SF-5@1	8.45	0.32	SH-1@1	6.91	0.37	SH-2@1	7.04	0.26	MK-1@1	6.15	0.27
YY-1@2	8.55	0.26	SF-5@2	7.12	0.24	SH-1@2	7.09	0.19	SH-2@4	6.66	0.27	MK-1@2	7.42	0.33
YY-1@3	8.09	0.22	SF-5@3	8.07	0.28	SH-1@3	6.71	0.29	SH-2@5	8.19	0.23	MK-1@3	6.44	0.40
YY-1@4	5.80	0.30	SF-5@4	8.67	0.35	SH-1@4	6.84	0.24	SH-2@8	6.55	0.27	MK-1@5	8.43	0.26
YY-1@5	8.06	0.23	SF-5@5	7.16	0.36	SH-1@5	9.40	0.29	SH-2@9	7.53	0.32	MK-1@6	4.69	0.29
YY-1@6	7.75	0.28	SF-5@6	7.81	0.38	SH-1@6	8.77	0.39	SH-2@10	6.38	0.30	MK-1@7	6.17	0.25
YY-1@7	7.86	0.27	SF-5@7	6.37	0.26	SH-1@7	9.95	0.21	SH-2@11	7.58	0.37	MK-1@8	6.23	0.27
YY-1@8	8.18	0.33	SF-5@8	6.41	0.28	SH-1@8	6.78	0.26	SH-2@12	5.81	0.39	MK-1@9	6.13	0.22
YY-1@9	7.82	0.28	SF-5@9	5.76	0.30	SH-1@9	8.48	0.28	SH-2@13	7.16	0.23	MK-1@10	4.42	0.36
YY-1@10	8.17	0.21	SF-5@10	6.35	0.37	SH-1@10	8.05	0.34	SH-2@14	7.37	0.35	MK-1@11	8.09	0.24
YY-1@11	8.07	0.29	SF-5@11	8.77	0.25	SH-1@11	4.81	0.26	SH-2@15	6.91	0.25	MK-1@12	7.61	0.34
YY-1@12	8.58	0.27	SF-5@12	7.62	0.41	SH-1@12	6.22	0.28	SH-2@16	9.37	0.38	MK-1@13	5.05	0.25
YY-1@13	7.99	0.33	SF-5@13	7.34	0.32	SH-1@13	6.61	0.24	SH-2@17	6.13	0.24	MK-1@14	4.92	0.39
YY-1@14	8.05	0.32	SF-5@14	8.03	0.33	SH-1@14	10.77	0.34	SH-2@18	5.79	0.39	MK-1@15	4.95	0.39
YY-1@15	8.75	0.31	SF-5@15	7.78	0.45	SH-1@16	6.54	0.38	SH-2@19	7.87	0.27	MK-1@16	6.90	0.35
YY-1@16	9.59	0.29	SF-5@16	8.63	0.27	SH-1@17	12.22	0.33	SH-2@20	6.85	0.31	MK-1@17	11.04	0.26
YY-1@17	8.96	0.34	SF-5@17	7.50	0.31	SH-1@18	7.17	0.35	SH-2@21	7.84	0.19	MK-1@18	7.89	0.33
YY-1@18	8.78	0.22	SF-5@18	7.79	0.26	SH-1@19	8.01	0.31	SH-2@22	7.78	0.22	MK-1@19	4.03	0.42
YY-1@20	8.31	0.25	SF-5@19	11.12	0.48	SH-1@20	6.79	0.20	SH-2@23	6.56	0.23	MK-1@20	8.90	0.38
YY-1@21	8.42	0.28	SF-5@20	5.65	0.19	SH-1@21	5.61	0.27	SH-2@24	8.39	0.30	MK-1@21	6.11	0.30
YY-1@22	8.33	0.25	SF-5@21	6.69	0.55	SH-1@22	6.98	0.37	SH-2@25	7.45	0.28	MK-1@22	7.94	0.14
YY-1@23	8.04	0.26	SF-5@22	6.73	0.27	SH-1@23	7.62	0.22	SH-2@26	8.19	0.29	MK-1@23	6.58	0.27
YY-1@24	11.22	0.38	SF-5@23	7.61	0.36	SH-1@24	6.90	0.31
YY-1@25	9.95	0.29	SF-5@24	8.73	0.36	SH-1@25	7.31	0.24
YY-1@26	6.57	0.26	SF-5@25	5.97	0.33	SH-1@26	4.11	0.39
YY-1@27	6.53	0.38	SF-5@26	7.45	0.49	SH-1@27	7.10	0.20
YY-1@28	7.96	0.30	SF-5@27	5.88	0.26	SH-1@28	6.94	0.24
YY-1@29	6.67	0.32	SF-5@28	8.49	0.40	SH-1@29	5.86	0.27
YY-1@30	11.81	0.37	SF-5@29	8.87	0.28	SH-1@30	9.95	0.26
YY-1@31	11.78	0.38	SF-5@30	9.03	0.26	SH-1@31	7.40	0.27
YY-1@32	9.22	0.27	SF-5@31	7.81	0.34	SH-1@32	7.80	0.31
YY-1@33	8.80	0.38	SF-5@32	8.30	0.48
YY-1@34	8.56	0.26	SF-5@33	6.93	0.27
YY-1@35	8.15	0.46	SF-5@34	6.05	0.33

表4 闽西南基性岩脉锆石O同位素组成 ^*

Table 4 Zircon O isotopes of mafic dikes

样品	δ¹⁸O	σ	样品	δ¹⁸O	σ	样品	δ¹⁸O	σ	样品	¹⁸O	σ	样品	δ¹⁸O	σ
YY-1@1	8.24	0.30	SF-5@1	8.45	0.32	SH-1@1	6.91	0.37	SH-2@1	7.04	0.26	MK-1@1	6.15	0.27
YY-1@2	8.55	0.26	SF-5@2	7.12	0.24	SH-1@2	7.09	0.19	SH-2@4	6.66	0.27	MK-1@2	7.42	0.33
YY-1@3	8.09	0.22	SF-5@3	8.07	0.28	SH-1@3	6.71	0.29	SH-2@5	8.19	0.23	MK-1@3	6.44	0.40
YY-1@4	5.80	0.30	SF-5@4	8.67	0.35	SH-1@4	6.84	0.24	SH-2@8	6.55	0.27	MK-1@5	8.43	0.26
YY-1@5	8.06	0.23	SF-5@5	7.16	0.36	SH-1@5	9.40	0.29	SH-2@9	7.53	0.32	MK-1@6	4.69	0.29
YY-1@6	7.75	0.28	SF-5@6	7.81	0.38	SH-1@6	8.77	0.39	SH-2@10	6.38	0.30	MK-1@7	6.17	0.25
YY-1@7	7.86	0.27	SF-5@7	6.37	0.26	SH-1@7	9.95	0.21	SH-2@11	7.58	0.37	MK-1@8	6.23	0.27
YY-1@8	8.18	0.33	SF-5@8	6.41	0.28	SH-1@8	6.78	0.26	SH-2@12	5.81	0.39	MK-1@9	6.13	0.22
YY-1@9	7.82	0.28	SF-5@9	5.76	0.30	SH-1@9	8.48	0.28	SH-2@13	7.16	0.23	MK-1@10	4.42	0.36
YY-1@10	8.17	0.21	SF-5@10	6.35	0.37	SH-1@10	8.05	0.34	SH-2@14	7.37	0.35	MK-1@11	8.09	0.24
YY-1@11	8.07	0.29	SF-5@11	8.77	0.25	SH-1@11	4.81	0.26	SH-2@15	6.91	0.25	MK-1@12	7.61	0.34
YY-1@12	8.58	0.27	SF-5@12	7.62	0.41	SH-1@12	6.22	0.28	SH-2@16	9.37	0.38	MK-1@13	5.05	0.25
YY-1@13	7.99	0.33	SF-5@13	7.34	0.32	SH-1@13	6.61	0.24	SH-2@17	6.13	0.24	MK-1@14	4.92	0.39
YY-1@14	8.05	0.32	SF-5@14	8.03	0.33	SH-1@14	10.77	0.34	SH-2@18	5.79	0.39	MK-1@15	4.95	0.39
YY-1@15	8.75	0.31	SF-5@15	7.78	0.45	SH-1@16	6.54	0.38	SH-2@19	7.87	0.27	MK-1@16	6.90	0.35
YY-1@16	9.59	0.29	SF-5@16	8.63	0.27	SH-1@17	12.22	0.33	SH-2@20	6.85	0.31	MK-1@17	11.04	0.26
YY-1@17	8.96	0.34	SF-5@17	7.50	0.31	SH-1@18	7.17	0.35	SH-2@21	7.84	0.19	MK-1@18	7.89	0.33
YY-1@18	8.78	0.22	SF-5@18	7.79	0.26	SH-1@19	8.01	0.31	SH-2@22	7.78	0.22	MK-1@19	4.03	0.42
YY-1@20	8.31	0.25	SF-5@19	11.12	0.48	SH-1@20	6.79	0.20	SH-2@23	6.56	0.23	MK-1@20	8.90	0.38
YY-1@21	8.42	0.28	SF-5@20	5.65	0.19	SH-1@21	5.61	0.27	SH-2@24	8.39	0.30	MK-1@21	6.11	0.30
YY-1@22	8.33	0.25	SF-5@21	6.69	0.55	SH-1@22	6.98	0.37	SH-2@25	7.45	0.28	MK-1@22	7.94	0.14
YY-1@23	8.04	0.26	SF-5@22	6.73	0.27	SH-1@23	7.62	0.22	SH-2@26	8.19	0.29	MK-1@23	6.58	0.27
YY-1@24	11.22	0.38	SF-5@23	7.61	0.36	SH-1@24	6.90	0.31
YY-1@25	9.95	0.29	SF-5@24	8.73	0.36	SH-1@25	7.31	0.24
YY-1@26	6.57	0.26	SF-5@25	5.97	0.33	SH-1@26	4.11	0.39
YY-1@27	6.53	0.38	SF-5@26	7.45	0.49	SH-1@27	7.10	0.20
YY-1@28	7.96	0.30	SF-5@27	5.88	0.26	SH-1@28	6.94	0.24
YY-1@29	6.67	0.32	SF-5@28	8.49	0.40	SH-1@29	5.86	0.27
YY-1@30	11.81	0.37	SF-5@29	8.87	0.28	SH-1@30	9.95	0.26
YY-1@31	11.78	0.38	SF-5@30	9.03	0.26	SH-1@31	7.40	0.27
YY-1@32	9.22	0.27	SF-5@31	7.81	0.34	SH-1@32	7.80	0.31
YY-1@33	8.80	0.38	SF-5@32	8.30	0.48
YY-1@34	8.56	0.26	SF-5@33	6.93	0.27
YY-1@35	8.15	0.46	SF-5@34	6.05	0.33

图7 闽西南基性岩脉锆石δ ¹⁸O值与年龄相关图
锆石δ ¹⁸O地幔值范围据参考文献[21, 22]

Fig.7 Zircon δ ¹⁸O vs. age diagram
Mantle δ ¹⁸O value after the references [21, 22]

表5 闽西南基性岩脉锆石Hf同位素组成

Table 5 Zircon Hf isotopes of mafic dikes

点号	¹⁷⁶Yb /¹⁷⁷Hf	σ	¹⁷⁶Lu /¹⁷⁷Hf	σ	¹⁷⁶Hf /¹⁷⁷Hf	σ	¹⁷⁶Hf /¹⁷⁷Hfi	ε_Hf(0)	ε_Hf(t)	T_DM /Ma	T_DM2 /Ma
YY-1@1	0.029313	0.000048	0.001240	0.000002	0.282431	0.000024	0.282427	-12.1	-8.8	1 169	1 757
YY-1@2	0.016859	0.000075	0.000694	0.000002	0.282410	0.000023	0.282408	-12.8	-9.4	1 181	1 800
YY-1@4	0.023772	0.000523	0.001131	0.000021	0.282662	0.000022	0.282660	-3.9	-1.6	839	1 269
YY-1@5	0.023173	0.000256	0.000929	0.000009	0.282251	0.000026	0.282248	-18.4	-15.1	1 411	2 156
YY-1@6	0.028977	0.000218	0.001166	0.000010	0.282460	0.000027	0.282456	-11.0	-7.8	1 126	1 694
YY-1@7	0.026285	0.000195	0.001068	0.000007	0.282368	0.000026	0.282365	-14.3	-10.9	1 252	1 896
YY-1@8	0.009108	0.000020	0.000371	0.000001	0.282423	0.000024	0.282422	-12.3	-10.0	1 154	1 800
YY-1@9	0.030484	0.000153	0.001252	0.000005	0.282440	0.000022	0.282436	-11.7	-8.4	1 157	1 737
YY-1@10	0.023534	0.000060	0.000952	0.000002	0.282419	0.000027	0.282416	-12.5	-9.1	1 177	1 782
YY-1@11	0.016220	0.000056	0.000671	0.000002	0.282471	0.000027	0.282469	-10.6	-7.6	1 096	1 675
YY-1@12	0.035373	0.000887	0.001486	0.000037	0.282432	0.000036	0.282428	-12.0	-8.8	1 175	1 759
YY-1@13	0.006900	0.000014	0.000276	0.000001	0.282512	0.000024	0.282511	-9.2	-6.9	1 028	1 601
YY-1@14	0.034108	0.000234	0.001399	0.000009	0.282410	0.000025	0.282406	-12.8	-9.6	1 204	1 807
YY-1@15	0.029994	0.000172	0.001223	0.000007	0.282379	0.000029	0.282375	-13.9	-10.5	1 242	1 872
SF-5@1	0.049195	0.000262	0.002000	0.000009	0.282034	0.000036	0.281986	-26.1	0.4	1 762	2 030
SF-5@2	0.008705	0.000198	0.000439	0.000009	0.282445	0.000033	0.282444	-11.6	-9.5	1 125	1 757
SF-5@3	0.039487	0.001062	0.001544	0.000041	0.281877	0.000037	0.281845	-31.7	-8.7	1 962	2 456
SF-5@4	0.015149	0.000116	0.000573	0.000003	0.281662	0.000034	0.281649	-39.3	-13.8	2 205	2 836
SF-5@5	0.033856	0.000062	0.001315	0.000003	0.282462	0.000033	0.282445	-11.0	3.8	1 127	1 376
SF-5@6	0.036974	0.002080	0.001375	0.000079	0.282042	0.000029	0.282014	-25.8	-2.7	1 721	2 083
SF-5@7	0.010943	0.000183	0.000488	0.000008	0.282099	0.000032	0.282088	-23.8	4.2	1 603	1 801
SF-5@9	0.022590	0.000453	0.000926	0.000016	0.281332	0.000043	0.281289	-50.9	2.2	2 676	2 817
SF-5@10	0.024615	0.000069	0.000993	0.000003	0.281716	0.000037	0.281697	-37.3	-15.5	2 155	2 827
SF-5@11	0.008459	0.000223	0.000291	0.000008	0.281939	0.000033	0.281933	-29.5	-5.7	1 814	2 267
SF-5@12	0.018547	0.000158	0.000742	0.000007	0.282350	0.000034	0.282341	-14.9	-1.0	1 267	1 640
SF-5@13	0.023679	0.000157	0.000927	0.000006	0.281923	0.000038	0.281906	-30.0	-9.1	1 866	2 396
SF-5@14	0.042394	0.001331	0.001618	0.000049	0.282484	0.000035	0.282463	-10.2	4.5	1 105	1 334
SH-1@1	0.052407	0.002978	0.002301	0.000127	0.282361	0.000039	0.282355	-14.5	-11.6	1 304	1 926
SH-1@2	0.018414	0.000203	0.000865	0.000009	0.282538	0.000034	0.282536	-8.3	-6.2	1 008	1 551
SH-1@3	0.033331	0.001058	0.001610	0.000044	0.282583	0.000035	0.282580	-6.7	-4.4	963	1 446
SH-1@4	0.043479	0.000187	0.001996	0.000008	0.282534	0.000034	0.282530	-8.4	-6.1	1 044	1 557
SH-1@5	0.030341	0.000112	0.001229	0.000004	0.282431	0.000039	0.282426	-12.1	-7.3	1 169	1 717
SH-1@6	0.015187	0.000520	0.000580	0.000020	0.281851	0.000045	0.281839	-32.6	-8.1	1 947	2 448
SH-1@7	0.020139	0.000265	0.000875	0.000011	0.282256	0.000039	0.282252	-18.2	-13.3	1 402	2 101
SH-1@8	0.020725	0.000117	0.000894	0.000006	0.281902	0.000039	0.281880	-30.8	-3.3	1 893	2 261
SH-1@13	0.062233	0.000705	0.002917	0.000041	0.282374	0.000066	0.282366	-14.1	-11.1	1 308	1 899
SH-2@1	0.019693	0.000632	0.000891	0.000026	0.282510	0.000034	0.282508	-9.3	-7.1	1 048	1 612
SH-2@4	0.018621	0.000047	0.000869	0.000003	0.282596	0.000035	0.282594	-6.2	-4.2	926	1 422
SH-2@9	0.052782	0.001405	0.002237	0.000064	0.282434	0.000037	0.282427	-12.0	-8.7	1 196	1 756
MK-1@1	0.023303	0.000200	0.000970	0.000008	0.281289	0.000033	0.281249	-52.4	-5.6	2 738	3 080
MK-1@2	0.028600	0.000413	0.001170	0.000017	0.282447	0.000031	0.282444	-11.5	-8.5	1 144	1 731
MK-1@5	0.026217	0.000259	0.001179	0.000011	0.282415	0.000030	0.282409	-12.6	-7.2	1 190	1 734
MK-1@6	0.021939	0.000109	0.000942	0.000005	0.281413	0.000034	0.281376	-48.1	-3.7	2 567	2 876
MK-1@8	0.011552	0.000108	0.000475	0.000005	0.281555	0.000034	0.281537	-43.0	-0.2	2 344	2 586
MK-1@11	0.004902	0.000077	0.000244	0.000003	0.281582	0.000037	0.281573	-42.1	2.0	2 294	2 485
MK-1@13	0.030628	0.001058	0.001131	0.000039	0.280798	0.000412	0.280745	-69.8	-16.5	3 417	3 973
MK-1@16	0.019704	0.000271	0.000852	0.000013	0.281334	0.000030	0.281302	-50.8	-7.9	2 668	3 081

表5 闽西南基性岩脉锆石Hf同位素组成

Table 5 Zircon Hf isotopes of mafic dikes

点号	¹⁷⁶Yb /¹⁷⁷Hf	σ	¹⁷⁶Lu /¹⁷⁷Hf	σ	¹⁷⁶Hf /¹⁷⁷Hf	σ	¹⁷⁶Hf /¹⁷⁷Hfi	ε_Hf(0)	ε_Hf(t)	T_DM /Ma	T_DM2 /Ma
YY-1@1	0.029313	0.000048	0.001240	0.000002	0.282431	0.000024	0.282427	-12.1	-8.8	1 169	1 757
YY-1@2	0.016859	0.000075	0.000694	0.000002	0.282410	0.000023	0.282408	-12.8	-9.4	1 181	1 800
YY-1@4	0.023772	0.000523	0.001131	0.000021	0.282662	0.000022	0.282660	-3.9	-1.6	839	1 269
YY-1@5	0.023173	0.000256	0.000929	0.000009	0.282251	0.000026	0.282248	-18.4	-15.1	1 411	2 156
YY-1@6	0.028977	0.000218	0.001166	0.000010	0.282460	0.000027	0.282456	-11.0	-7.8	1 126	1 694
YY-1@7	0.026285	0.000195	0.001068	0.000007	0.282368	0.000026	0.282365	-14.3	-10.9	1 252	1 896
YY-1@8	0.009108	0.000020	0.000371	0.000001	0.282423	0.000024	0.282422	-12.3	-10.0	1 154	1 800
YY-1@9	0.030484	0.000153	0.001252	0.000005	0.282440	0.000022	0.282436	-11.7	-8.4	1 157	1 737
YY-1@10	0.023534	0.000060	0.000952	0.000002	0.282419	0.000027	0.282416	-12.5	-9.1	1 177	1 782
YY-1@11	0.016220	0.000056	0.000671	0.000002	0.282471	0.000027	0.282469	-10.6	-7.6	1 096	1 675
YY-1@12	0.035373	0.000887	0.001486	0.000037	0.282432	0.000036	0.282428	-12.0	-8.8	1 175	1 759
YY-1@13	0.006900	0.000014	0.000276	0.000001	0.282512	0.000024	0.282511	-9.2	-6.9	1 028	1 601
YY-1@14	0.034108	0.000234	0.001399	0.000009	0.282410	0.000025	0.282406	-12.8	-9.6	1 204	1 807
YY-1@15	0.029994	0.000172	0.001223	0.000007	0.282379	0.000029	0.282375	-13.9	-10.5	1 242	1 872
SF-5@1	0.049195	0.000262	0.002000	0.000009	0.282034	0.000036	0.281986	-26.1	0.4	1 762	2 030
SF-5@2	0.008705	0.000198	0.000439	0.000009	0.282445	0.000033	0.282444	-11.6	-9.5	1 125	1 757
SF-5@3	0.039487	0.001062	0.001544	0.000041	0.281877	0.000037	0.281845	-31.7	-8.7	1 962	2 456
SF-5@4	0.015149	0.000116	0.000573	0.000003	0.281662	0.000034	0.281649	-39.3	-13.8	2 205	2 836
SF-5@5	0.033856	0.000062	0.001315	0.000003	0.282462	0.000033	0.282445	-11.0	3.8	1 127	1 376
SF-5@6	0.036974	0.002080	0.001375	0.000079	0.282042	0.000029	0.282014	-25.8	-2.7	1 721	2 083
SF-5@7	0.010943	0.000183	0.000488	0.000008	0.282099	0.000032	0.282088	-23.8	4.2	1 603	1 801
SF-5@9	0.022590	0.000453	0.000926	0.000016	0.281332	0.000043	0.281289	-50.9	2.2	2 676	2 817
SF-5@10	0.024615	0.000069	0.000993	0.000003	0.281716	0.000037	0.281697	-37.3	-15.5	2 155	2 827
SF-5@11	0.008459	0.000223	0.000291	0.000008	0.281939	0.000033	0.281933	-29.5	-5.7	1 814	2 267
SF-5@12	0.018547	0.000158	0.000742	0.000007	0.282350	0.000034	0.282341	-14.9	-1.0	1 267	1 640
SF-5@13	0.023679	0.000157	0.000927	0.000006	0.281923	0.000038	0.281906	-30.0	-9.1	1 866	2 396
SF-5@14	0.042394	0.001331	0.001618	0.000049	0.282484	0.000035	0.282463	-10.2	4.5	1 105	1 334
SH-1@1	0.052407	0.002978	0.002301	0.000127	0.282361	0.000039	0.282355	-14.5	-11.6	1 304	1 926
SH-1@2	0.018414	0.000203	0.000865	0.000009	0.282538	0.000034	0.282536	-8.3	-6.2	1 008	1 551
SH-1@3	0.033331	0.001058	0.001610	0.000044	0.282583	0.000035	0.282580	-6.7	-4.4	963	1 446
SH-1@4	0.043479	0.000187	0.001996	0.000008	0.282534	0.000034	0.282530	-8.4	-6.1	1 044	1 557
SH-1@5	0.030341	0.000112	0.001229	0.000004	0.282431	0.000039	0.282426	-12.1	-7.3	1 169	1 717
SH-1@6	0.015187	0.000520	0.000580	0.000020	0.281851	0.000045	0.281839	-32.6	-8.1	1 947	2 448
SH-1@7	0.020139	0.000265	0.000875	0.000011	0.282256	0.000039	0.282252	-18.2	-13.3	1 402	2 101
SH-1@8	0.020725	0.000117	0.000894	0.000006	0.281902	0.000039	0.281880	-30.8	-3.3	1 893	2 261
SH-1@13	0.062233	0.000705	0.002917	0.000041	0.282374	0.000066	0.282366	-14.1	-11.1	1 308	1 899
SH-2@1	0.019693	0.000632	0.000891	0.000026	0.282510	0.000034	0.282508	-9.3	-7.1	1 048	1 612
SH-2@4	0.018621	0.000047	0.000869	0.000003	0.282596	0.000035	0.282594	-6.2	-4.2	926	1 422
SH-2@9	0.052782	0.001405	0.002237	0.000064	0.282434	0.000037	0.282427	-12.0	-8.7	1 196	1 756
MK-1@1	0.023303	0.000200	0.000970	0.000008	0.281289	0.000033	0.281249	-52.4	-5.6	2 738	3 080
MK-1@2	0.028600	0.000413	0.001170	0.000017	0.282447	0.000031	0.282444	-11.5	-8.5	1 144	1 731
MK-1@5	0.026217	0.000259	0.001179	0.000011	0.282415	0.000030	0.282409	-12.6	-7.2	1 190	1 734
MK-1@6	0.021939	0.000109	0.000942	0.000005	0.281413	0.000034	0.281376	-48.1	-3.7	2 567	2 876
MK-1@8	0.011552	0.000108	0.000475	0.000005	0.281555	0.000034	0.281537	-43.0	-0.2	2 344	2 586
MK-1@11	0.004902	0.000077	0.000244	0.000003	0.281582	0.000037	0.281573	-42.1	2.0	2 294	2 485
MK-1@13	0.030628	0.001058	0.001131	0.000039	0.280798	0.000412	0.280745	-69.8	-16.5	3 417	3 973
MK-1@16	0.019704	0.000271	0.000852	0.000013	0.281334	0.000030	0.281302	-50.8	-7.9	2 668	3 081

图8 闽西南基性岩脉锆石年龄与 ε _Hf( t)值相关图
底图据参考文献[18]

Fig.8 Zircon age vs. ε _Hf( t) diagram
Base map after the reference [18]

图9 ε _Hf( t) vs. δ ¹⁸O图解
S型花岗岩锆石的Hf-O同位素范围根据广西印支期大容山堇青石花岗岩的数据计算获得 ^{[

3
]}

Fig.9 ε _Hf( t) vs. δ ¹⁸O diagram
Zircon Hf-O isotope value of S type granite according to data calculation of indosinian cordierite granite from Darongshan, Guangxi ^{[

3
]}

图10 Hf二阶段模式年龄分布直方图

Fig.10 Hf two stage model age distribution histogram

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摘要

Zircon SIMS U-Pb Age, Hf and O Isotopes of Mafic Dikes, Southwest Fujian Province