地球科学进展

地球科学进展 ›› 2018, Vol. 33 ›› Issue (10): 1058 -1074. doi: 10.11867/j.issn.1001-8166.2018.10.1058.

研究论文 上一篇    下一篇

岩浆混合作用的识别:以义敦岛弧稻城岩体为例
张瑞刚( ), 高雪, 杨立强 *( )   
  1. 中国地质大学地质过程与矿产资源国家重点实验室,北 京 100083
  • 收稿日期:2018-04-18 修回日期:2018-08-13 出版日期:2018-10-10
  • 通讯作者: 杨立强 E-mail:1374113069@qq.com;lqyang@cugb.edu.cn
  • 基金资助:
    国家重点基础研究发展计划项目“中国西南特提斯典型复合成矿系统及深部驱动机制”(编号:2015CB452605);高等学校学科创新引智计划“成矿作用动力学”(编号:B07011)资助.

Identification of Magma Mixing: A Case Study of the Daocheng Batholith in the Yidun Arc

Ruigang Zhang( ), Xue Gao, Liqiang Yang *( )   

  1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
  • Received:2018-04-18 Revised:2018-08-13 Online:2018-10-10 Published:2018-11-16
  • Contact: Liqiang Yang E-mail:1374113069@qq.com;lqyang@cugb.edu.cn
  • About author:

    First author:Zhang Ruigang (1993-), male, Qingyang City, Gansu Province, Master student. Research areas include deposits and geochemistry of mineral deposits. E-mail:1374113069@qq.com

  • Supported by:
    Project supported by the National Key Basic Research and Development Plans "Typical composite metallogenic system and deep drive mechanism of southwest Tethys, in China"(No.2015CB452605);The Program of Academic Innovation and Intelligence Introduction in Iinstitutions of Higher Learning "Dynamics of ore-forming processes"(No.B07011).
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义敦岛弧稻城岩体由花岗岩、花岗闪长岩和钾长花岗岩组成。大量暗色镁铁质微粒包体发育于花岗闪长岩和钾长花岗岩中,且其与寄主岩石的接触界线截然。暗色镁铁质微粒包体具有细粒结构,发育石英眼构造、针状磷灰石和具环带结构的斜长石斑晶。通过暗色镁铁质微粒包体与寄主岩石的岩相学、斜长石环带和主微量稀土元素特征的研究,识别出稻城岩体的岩浆混合作用,并结合前人对该岩体Sr-Nd-Hf同位素的研究成果,对稻城岩体的岩石成因进行了讨论。暗色镁铁质微粒包体中斜长石牌号为29~44,寄主岩石中斜长石牌号为21~50,斜长石斑晶的成分突变和熔蚀结构与岩浆混合作用有关。暗色镁铁质微粒包体的SiO2质量分数较低(56.34%~60.91%),Al2O3质量分数较高(16.06%~17.98%)、富镁铁,具有准铝质特征(A/CNK=0.82~0.98);而寄主岩石属于高钾钙碱性系列,富碱(Na2O+K2O的质量分数为6.25%~7.79%)、贫钙(CaO质量分数为1.40%~3.22%)。暗色镁铁质微粒包体与寄主岩石均富集大离子亲石元素(Rb,K和Pb)和轻稀土元素,亏损高场强元素(Nb,Ta,Zr,Hf,P和Ti),与典型岛弧岩浆岩的微量元素特征一致。但与寄主岩石相比,暗色镁铁质微粒包体具有近平坦的稀土配分曲线((La/Yb)N=1.99~2.46)和较明显的Eu负异常(Eu/Eu*=0.30~0.50)。寄主岩石Rb/Sr值范围为1.0~1.9,与壳源(Rb/Sr>0.5)的物质范围一致;Zr/Hf值范围为27.5~36.9,与地壳和幔源岩石之间Zr/Hf值(33.0~36.3)接近,表明稻城岩体的成因与幔源物质和壳源物质的混合有关。暗色镁铁质微粒包体具有较低Si含量和较高Mg#,Nb/Ta值范围为11.0~14.5,且包体和寄主岩石的主要氧化物与其SiO2呈线性分布,表明暗色镁铁质微粒包体的形成与岩浆混合作用有关。稻城花岗质岩体的母岩浆起源于晚三叠世岛弧下地壳的部分熔融,且源区有少量幔源物质的加入;暗色镁铁质微粒包体是由镁铁质岩浆与长英质岩浆混合形成的。

关键词: 岩浆混合, 岩石成因, 岩石地球化学, 稻城岩体, 义敦岛弧

The Daocheng batholiths, located in the east of the Yidun arc, consist of granite, granodiorite and K-feldspar granite. Abundant massive mafic microgranular enclaves (MMEs) mainly developed within the granodiorite and K-feldspar granite, and they have clear contacts with the hosted granites. The MMEs are characterized by the quartz eye structure, quenched apatite, and plagioclases phenocrysts with obvious oscillatory zones. Petrographical studies on MMEs and host granites, zoned plagioclase and whole-rock geochemical analysis were carried out to identify the presence of magma mixing. Combined with the previous studies on the whole-rock Sr-Nd-Hf isotopic signatures, the petrogenesis of Daocheng batholith was discussed. The zoned plagioclases from MMEs have An contents varying between 29 and 44, while those from the host granites have An contents of 21~50. The compositional variations and corrosion structure of plagioclase are probably related to magma mixing. Geochemically, the MMEs have relatively low SiO2 contents (56.34~60.91wt%), high Al2O3 contents of 16.06~17.98wt%, and are enriched in magnesium and iron, belonging to metalumnious series (A/CNK=0.82~0.98). The Daocheng batholith belongs to high-K calc-alkaline series, which have high alkaline contents (Na2O+K2O=6.25~7.79wt%) and low CaO contents (1.40~3.22wt%). Furthermore, both the MMEs and hosted granites are enriched in LILEs (K, Rb and Pb) and LREEs and depleted in HFSEs (Nb, Ta, Zr, Hf, P and Ti), showing affinities of typical arc magmas. Compared with the host granites, the MMEs are characterized by lower (La/Yb)N ratios of 1.99 to 2.46, and much more obvious Eu depletions (Eu/Eu*=0.30~0.50). The host granites have Rb/Sr ratios ranging from 1.0 to 1.9, and they are consistent with the crust-derived materials (Rb/Sr>0.5). Their Zr/Hf ratios range from 27.5 to 36.9, which are close to the transitional Zr/Hf ratios between mantle-and crust-derived materials. This indicates that the formation of Daocheng batholith is genetically related to the mixing between mantle-and crust-derived materials. In addition, the relatively low silica contents and high Mg# values, and the linear patterns of MgO, Al2O3 and Fe2O3 with SiO2 contents from the MMEs and host granites, show that the formation of MMEs is genetically related to magma mixing. Overall, the parent magmas of Daocheng granites are derived from the partial melting of Late Triassic arc lower crust, with the input of minor mantle-derived materials. The MMEs are generated by the mixing of the mafic magma with felsic magma.

Key words: Magma mixing, Petrogenesis, Geochemistry, Daocheng batholith, The Yindun Arc

中图分类号: 

图1 义敦岛弧地质简图
(a)义敦岛弧及邻区大地构造图(据参考文献[ 32 ]修改);(b)义敦岛弧地质简图(据参考文献[ 29 ]修改)
Fig.1 Geological sketch map of the Yidun Arc
(a)Geotectonic map of the Yidun Arc and adjacent areas (modified after reference[32]);(b)Geological sketch map of the Yidun Arc area (modified after reference[29])
图2 稻城岩体手标本及显微镜下照片
(a)花岗岩,MMEs中有团块状石英、黄铁矿;(b)花岗闪长岩;(c)钾长花岗岩;(d)石英眼构造、斜长石斑晶(-);(e)包体中针状磷灰石,淬火结构(-);(f)角闪石包裹斜长石,不平衡结构(+);(g)显微石英包裹块状石英(+);(h)斜长石环带(+);(i)花岗结构(+);Ap:磷灰石;Bi:黑云母;Hb:角闪石;Pl:斜长石;Q:石英
Fig.2 Photographs of hand specimens and photomicrographs of the granite and MMEs in Daocheng batholith
(a)MMEs with cloudy quartz and pyrite hosted by granite;(b)Granodiorite; (c)K-feldspar granite; (d)Quartz eye and plagioclase phenocryst (-);(e)Quench texture of apatite in MMEs (-); (f)Plagioclase wrapped by hornblende with disequilibrium texture (+); (g)Two-stages quartz (+);(h)The zoned plagioclase (+); (i)Granitic texture (+); Ap. Apatite; Bi. Biotite; Hb. Hornblende; Pl. Plagioclase; Q. Quartz
表1 义敦岛弧稻城岩体与MMEs特征
Table 1 Summary of the hosting granite and MMEs of Daocheng batholith in the Yidun Arc
样品 岩性 取样位置 结构构造 矿物组合及含量* 副矿物
DC16-1 花岗岩 29°05'50″N,
100°15'54″E		 花岗结构 Q(20%)+Pl(15%)+Kf(40%)+Bi(10%)+Hb(5%)
DC16-3 花岗岩 29°04'01″N,
100°19'21″E		 花岗结构 Q(20%)+Pl(20%)+Kf(30%)+Bi(15%)+Hb(10%) Ap
DC16-4 花岗岩 29°04'01″N,
100°19'21″E		 花岗结构 Q(25%)+Pl(20%)+Kf(40%)+Bi(5%) Ap,Mag
DC16-5 MMEs 28°42'36″N,
100°15'39″E		 细粒结构 Q(15%)+Pl(40%)+Kf(15%)+Bi(10%)+Hb(15%) Ap,Mag,Ccp
Py,Gn
DC16-6 花岗闪长岩 28°42'36″N,
100°15'39″E		 花岗结构 Q(20%)+Pl(35%)+Kf(30%)+Bi(5%)+Hb(5%) Ap,Mag
DC16-7 钾长花岗岩 29°19'25″N,
100°05'16″E		 花岗结构 Q(20%)+Pl(25%)+Kf(40%)+Bi(5%) Mag
DC16-8 MMEs 29°22'35″N,
100°08'41″E		 细粒结构 Q(15%)+Pl(40%)+Kf(10%)+Bi(10%)+Hb(15%) Ap,Ccp,Gn
DC16-9 花岗闪长岩 29°22'35″N,
100°08'41″E		 花岗结构 Q(20%)+Pl(35%)+Kf(30%)+Bi(10%)+Hb(5%) Ap,Py
表2 义敦岛弧稻城岩体与MMEs的斜长石化学成分(单位:质量分数,%)
Table 2 Major elements (wt%) of plagioclase of the hosted granite and MMEs of Daocheng batholith in the Yidun Arc
样品
点号		 DC16-3(花岗岩) DC16-6(花岗闪长岩)
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 10
SiO2 60.76 58.57 59.43 59.33 59.49 58.79 59.29 58.64 59.46 57.08 59.91 58.06 58.74 57.93 59.20 56.64 54.80 59.04 60.49
TiO2 0.06 0.02 0.01 0.01 0.10 0.06 0.09 0.00 0.15 0.00 0.21
Al2O3 23.97 25.40 24.80 25.16 24.75 25.31 24.07 25.04 24.79 26.21 24.07 25.47 24.83 25.34 24.82 25.91 27.53 24.84 23.97
FeO 0.09 0.13 0.10 0.06 0.01 0.05 0.19 0.19 0.15 0.07 0.10 0.04
MnO 0.07 0.19 0.08 0.14 0.14 0.00 0.01 0.01 0.17 0.09
MgO 0.04 0.02 0.02 0.03 0.09 0.02 0.06 0.06 0.02 0.03
CaO 5.52 7.35 6.70 6.86 6.39 7.10 6.12 6.93 6.75 7.92 5.99 7.14 6.85 7.50 6.78 8.13 9.86 6.58 5.67
Na2O 9.28 8.05 8.53 8.45 8.63 8.29 8.74 8.22 8.28 7.53 8.92 7.98 8.46 8.00 8.12 7.51 6.37 8.31 9.05
K2O 0.05 0.07 0.20 0.27 0.27 0.22 0.23 0.18 0.26 0.23 0.42 0.28 0.31 0.28 0.30 0.31 0.20 0.39 0.30
P2O5 0.11 0.16 0.09 0.12 0.12 0.14 0.26 0.09 0.13 0.23 0.23 0.13 0.10 0.21 0.09 0.20 0.08 0.22 0.03
合计 99.77 99.69 99.94 100.38 99.85 100.01 98.85 99.34 99.74 99.35 99.73 99.17 99.36 99.65 99.56 98.93 99.22 99.59 99.79
Si 2.72 2.64 2.67 2.65 2.67 2.64 2.69 2.65 2.67 2.59 2.70 2.63 2.65 2.62 2.67 2.59 2.50 2.66 2.71
Al 1.26 1.35 1.31 1.33 1.31 1.34 1.29 1.33 1.31 1.40 1.28 1.36 1.32 1.35 1.32 1.39 1.48 1.32 1.27
Ca 0.26 0.35 0.32 0.33 0.31 0.34 0.30 0.34 0.32 0.38 0.29 0.35 0.33 0.36 0.33 0.40 0.48 0.32 0.27
Na 0.80 0.70 0.74 0.73 0.75 0.72 0.77 0.72 0.72 0.66 0.78 0.70 0.74 0.70 0.71 0.66 0.56 0.73 0.79
K 0.00 0.00 0.01 0.02 0.02 0.01 0.01 0.01 0.02 0.01 0.02 0.02 0.02 0.02 0.02 0.02 0.01 0.02 0.02
An 24.67 33.41 29.95 30.53 28.62 31.75 27.56 31.47 30.62 36.30 26.47 32.58 30.41 33.62 31.06 36.81 45.60 29.80 25.31
Ab 75.06 66.21 68.99 68.04 69.94 67.08 71.21 67.55 67.97 62.45 71.32 65.90 67.96 64.89 67.31 61.52 53.3 68.10 73.10
Or 0.27 0.38 1.06 1.43 1.44 1.17 1.23 0.97 1.40 1.26 2.21 1.52 1.64 1.49 1.64 1.67 1.10 2.10 1.59
样品
点号		 DC16-8(MMEs) DC16-9(花岗闪长岩)
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6
SiO2 59.25 55.63 57.28 55.91 58.32 57.46 57.59 55.26 57.25 53.87 55.70 57.84 58.04 58.06 61.47
TiO2 0.06 0.00 0.14 0.01 0.02 0.04 0.07 0.04 0.05 0.00 0.06 0.00
Al2O3 25.17 26.86 26.22 26.68 25.04 25.97 25.63 27.18 26.25 28.26 26.87 25.64 25.30 25.40 23.38
FeO 0.10 0.08 0.02 0.16 0.16 0.24 0.06 0.02 0.25 0.17 0.11 0.09 0.18 0.06
MnO 0.03 0.05 0.03 0.02 0.07 0.08 0.05 0.10 0.07
MgO 0.02 0 0.05 0
CaO 6.46 9.27 7.75 8.78 7.32 7.91 7.48 9.53 7.97 10.92 8.85 7.57 7.42 7.48 4.73
Na2O 8.43 6.87 7.62 7.05 8.02 7.74 7.97 6.64 7.62 5.93 6.63 7.69 7.94 7.95 9.61
K2O 0.25 0.17 0.16 0.11 0.22 0.26 0.06 0.11 0.13 0.28 0.16 0.21 0.19 0.32
P2O5 0.18 0.19 0.19 0.30 0.13 0.1 0.29 0.22 0.24 0.18 0.08 0.26 0.18 0.15 0.16
合计 99.95 99.12 99.64 99.06 99.24 99.73 99.10 99.12 99.60 99.63 98.75 99.37 99.36 99.46 99.79
Si 2.66 2.54 2.59 2.55 2.64 2.60 2.61 2.52 2.59 2.46 2.55 2.62 2.63 2.63 2.75
Al 1.33 1.44 1.40 1.44 1.34 1.38 1.37 1.46 1.40 1.52 1.45 1.37 1.35 1.35 1.23
Ca 0.31 0.45 0.38 0.43 0.36 0.38 0.36 0.47 0.39 0.53 0.43 0.37 0.36 0.36 0.23
Na 0.73 0.61 0.67 0.62 0.70 0.68 0.70 0.59 0.67 0.52 0.59 0.68 0.70 0.70 0.83
K 0.01 0.01 0.01 0.01 0.01 0.02 0.00 0.00 0.01 0.01 0.02 0.01 0.01 0.01 0.02
An 29.35 42.32 35.67 40.52 33.13 35.59 34.04 44.23 36.41 50.08 41.78 34.92 33.67 33.86 21.02
Ab 69.30 56.76 63.46 58.88 65.68 63.02 65.63 55.77 62.99 49.21 56.64 64.20 65.20 65.12 77.29
Or 1.35 0.92 0.88 0.60 1.19 1.39 0.33 0.00 0.60 0.71 1.57 0.88 1.13 1.02 1.69
表3 义敦岛弧稻城岩体与MMEs的主量(质量分数,%)和微量元素(×10 -6)分析表
Table 3 Major(wt%) and trace elements(×10 -6) compositions for the hosted rock and MMEs of Daocheng batholith in the Yidun Arc
样品 DC16-1 DC16-3 DC16-4 DC16-6 DC16-7 DC16-9 DC16-5 DC16-8
岩性 花岗岩 花岗岩 花岗岩 花岗闪长岩 钾长花岗岩 花岗闪长岩 MMEs MMEs
SiO2 72.44 73.40 73.73 67.90 75.41 70.54 56.34 60.91
TiO2 0.34 0.38 0.26 0.41 0.12 0.42 0.62 0.72
Al2O3 13.79 13.00 13.69 15.66 13.11 14.41 17.98 16.06
FeO 2.13 2.28 1.50 2.33 0.95 2.55 5.05 5.30
TFe2O3 2.71 3.12 2.13 3.11 1.32 3.27 6.76 6.55
MnO 0.05 0.06 0.04 0.07 0.03 0.06 0.20 0.17
MgO 0.69 0.83 0.41 1.29 0.23 1.08 3.20 2.89
CaO 2.61 2.52 1.68 3.02 1.40 3.22 6.09 6.18
Na2O 3.19 2.93 3.40 3.20 3.46 3.18 3.80 3.50
K2O 3.60 3.32 4.05 4.59 4.27 3.28 3.93 2.31
P2O5 0.07 0.07 0.05 0.16 0.03 0.09 0.40 0.13
烧失量 0.50 0.34 0.53 0.57 0.59 0.43 0.64 0.57
合计 99.99 99.97 99.98 99.98 99.96 99.98 99.96 99.98
K2O+Na2O 6.79 6.25 7.45 7.79 7.73 6.46 7.73 5.81
K2O/Na2O 1.13 1.13 1.19 1.43 1.23 1.03 1.03 0.66
A/CNK 0.99 1.00 1.05 1.00 1.02 0.98 0.83 0.82
A/NK 1.51 1.55 1.37 1.53 1.27 1.64 1.71 1.95
Mg# 33.00 34.00 28.00 45.00 25.00 39.00 48.00 46.00
DI 81.00 81.00 87.00 77.00 90.00 76.00 57.00 56.00
Li 36.50 35.80 43.30 30.50 34.60 30.40 32.50 40.50
Be 1.86 1.72 2.43 2.11 2.25 2.02 3.68 2.39
Sc 8.52 9.72 6.40 8.65 3.28 9.84 22.50 24.20
V 27.00 30.80 13.80 59.00 6.93 37.00 154.00 91.90
Cr 8.78 9.14 4.24 12.70 2.31 16.80 13.20 46.10
Co 4.58 6.14 2.72 6.10 1.32 6.35 14.20 14.90
Ni 3.07 3.70 2.11 6.16 0.46 5.19 12.90 11.60
Cu 2.12 4.85 1.77 8.22 0.80 4.38 20.60 16.00
Zn 39.70 43.60 40.20 39.70 21.00 46.8 74.00 85.50
Ga 16.90 16.50 18.20 17.20 15.10 16.10 21.00 18.10
Rb 135.00 129.00 157.00 168.00 178.00 121.00 177.00 125.00
Sr 133.00 121.00 116.00 457.00 63.90 144.00 379.00 131.00
Y 28.50 29.20 35.90 19.30 38.90 25.10 63.00 36.70
Zr 179.00 193.00 253.00 224.00 118.00 186.00 233.00 240.00
Nb 11.20 12.10 19.70 16.60 8.55 11.50 25.60 15.20
Cs 3.41 4.61 4.33 4.02 4.70 4.48 5.23 6.13
Ba 665.00 610.00 780.00 1 516.00 508.00 562.00 834.00 522.00
La 40.30 43.20 32.40 51.80 33.00 30.30 22.50 12.00
Ce 73.40 83.30 97.90 87.40 58.30 54.40 57.20 26.30
Pr 8.08 9.07 6.71 9.24 6.69 6.13 9.08 3.92
Nd 29.40 31.80 23.20 32.20 23.70 24.60 41.80 17.70
Sm 5.46 5.71 4.69 5.47 4.93 4.72 11.80 5.33
Eu 0.83 0.78 0.70 1.12 0.40 0.97 1.14 0.88
Gd 4.85 5.30 4.62 4.26 4.88 4.29 10.90 5.27
Tb 0.83 0.91 0.94 0.68 0.92 0.80 2.00 1.06
Dy 4.79 5.02 5.76 3.54 5.33 4.43 11.00 6.16
Ho 0.88 0.94 1.10 0.63 1.08 0.85 2.03 1.23
Er 2.67 2.85 3.48 1.90 3.45 2.56 6.12 3.77
Tm 0.45 0.44 0.60 0.30 0.58 0.428 0.98 0.64
Yb 2.87 2.85 3.90 1.96 3.78 2.58 6.56 4.33
Lu 0.42 0.42 0.57 0.31 0.57 0.40 0.92 0.65
样品 DC16-1 DC16-3 DC16-4 DC16-6 DC16-7 DC16-9 DC16-5 DC16-8
岩性 花岗岩 花岗岩 花岗岩 花岗闪长岩 钾长花岗岩 花岗闪长岩 MMEs MMEs
Mo 0.28 0.27 0.19 0.39 0.21 0.46 1.41 0.65
W 0.19 0.40 0.20 0.32 0.45 0.19 0.40 0.32
Hf 5.09 5.37 6.99 6.07 4.29 5.69 6.60 6.82
Ta 0.95 1.02 1.85 1.17 1.12 1.05 1.76 1.38
Pb 17.00 15.40 25.50 20.90 20.30 20.10 22.60 17.00
Th 17.40 16.00 19.20 44.30 19.50 12.60 14.80 10.90
U 2.59 1.69 2.85 8.14 3.20 2.59 6.99 3.59
ΣREE 203.73 221.79 222.47 220.11 186.50 162.55 247.02 125.94
LREE/HREE 3.40 3.63 2.91 5.70 2.14 2.92 1.39 1.11
(La/Yb)N 10.07 10.87 5.96 18.96 6.26 8.42 2.46 1.99
(Gd/Yb)N 1.40 1.54 0.98 1.80 1.07 1.38 1.37 1.01
Eu/Eu* 0.48 0.42 0.45 0.68 0.25 0.65 0.30 0.50
Sr/Y 4.67 4.14 3.23 23.68 1.64 5.74 6.02 3.57
Rb/Sr 1.02 1.07 1.35 0.37 2.79 0.84 0.47 0.95
Nb/Ta 11.80 11.86 10.65 14.19 7.63 10.95 14.55 11.01
Zr/Hf 35.17 35.94 36.19 36.90 27.51 32.69 35.30 35.19
TZr/℃ 790.00 800.00 830.00 803.00 761.00 790.00 755.00 769.00
图3 稻城岩体与MMEs地球化学分类图解
(a)据参考文献[ 44 ]修改;(b)据参考文献[ 45 ]修改; (c)据参考文献[ 46 ]修改
Fig.3 Geochemical classification diagrams of host granites and MMEs in Daocheng batholith
(a) Modified after reference[44]; (b) Modified after reference[45]; (c) Modified after reference[46]
图4 稻城岩体与MMEs的稀土元素配分图及微量元素蛛网图
(a)稻城岩体与MMEs稀土元素配分曲线图;(b)微量元素蛛网图
Fig.4 Chondrite-normalized REE patterns and primary mantle-normalized trace element spider diagram for the Dacocheng batholith
(a)Chondrite-normalized REEs patterns in Dacocheng batholith; (b)Primitive mantle-normalized trace element patterns for the MMEs and intrusion in Dacocheng batholith
图5 稻城岩体成因类型与微量元素图解
(a)据参考文献[ 50 ]修改
Fig.5 The diagrams of petrogenesis discrimination and structural setting for Daocheng intrusion and MMEs
(a) Modified after reference[50]
图6 义敦岛弧稻城岩体锆石Hf同位素
Fig.6 Zircon Hf isotopic compositions of Daocheng batholith
图7 MMEs与花岗闪长岩中斜长石环带与成分变化
(a)MMEs;(b)花岗闪长岩
Fig.7 The oscillatory zoning and compositional variation of plagioclase phenocrysts from the MMEs and granodiorite
(a) MMEs; (b) Granodiorite
图8 稻城岩体与MMEs哈克图解
Fig.8 Harker diagrams of MMEs and intrusion in Daocheng
图9 稻城岩体大地构造环境判别图解(据参考文献[ 76 ]修改)
Fig.9 Discrimination diagrams for the tectonic setting of Daocheng granites and MMEs (modified after reference[76])
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