地球科学进展

地球科学进展 ›› 2018, Vol. 33 ›› Issue (9): 945 -957. doi: 10.11867/j.issn.1001-8166.2018.09.0945

研究论文 上一篇    下一篇

大别造山带内部变沉积岩锆石LA-ICP MS U-Pb定年及其大地构造意义
田自强 1( ), 王勇生 1, *( ), 胡召齐 2, 白桥 1   
  1. 1.合肥工业大学资源与环境工程学院,安徽 合肥 230009
    2.安徽省地质调查院,安徽 合肥 230001
  • 收稿日期:2018-07-09 修回日期:2018-08-20 出版日期:2018-10-20
  • 通讯作者: 王勇生 E-mail:1401478044@qq.com;yshw9007@hfut.edu.cn
  • 基金资助:
    *国家自然科学基金项目“大别造山带北淮阳单元的变形历史与构造属性”(编号:41572186)资助.

LA-ICP MS Zircon U-Pb Dating of Metasedimentary Rocks in Dabie Orogenic Belt and Its Tectonic Implications

Ziqiang Tian 1( ), Yongsheng Wang 1, *( ), Zhaoqi Hu 2, Qiao Bai 1   

  1. 1.School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China
    2.Geological Survey of Anhui Province, Hefei 230001, China
  • Received:2018-07-09 Revised:2018-08-20 Online:2018-10-20 Published:2018-10-24
  • Contact: Yongsheng Wang E-mail:1401478044@qq.com;yshw9007@hfut.edu.cn
  • About author:

    First author:Tian Ziqiang(1994-),male,Bozhou City,Anhui Province,Master student. Research areas include orogenic dynamics. E-mail:1401478044@qq.com

  • Supported by:
    * Foundation item:Project supported by the National Natural Science Foundation of China "Deformation history and tectonic attribute of the Beihuaiyang unit in the Dabie orogenic belt"(No.41572186).
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大别造山带内部零星出露有浅变质岩,其与造山带其他单元内高级变质岩的共生状态可以为造山带的演化过程提供信息。北大别单元东北缘沈桥地区出露有浅变质岩。为了获取该浅变质岩的形成时间、物源信息及与北大别单元岩石之间的接触关系,在详细的野外观察基础上,对出露于沈桥地区的浅变质岩进行了详细的显微鉴定和碎屑锆石LA-ICP MS U-Pb定年。研究发现,沈桥地区浅变质岩具有与佛子岭群诸佛庵岩组一致的岩石学特征,碎屑锆石的最小年龄为431 Ma,年龄频谱特征与佛子岭群变沉积岩一致,表明沈桥地区浅变质岩为佛子岭群的一部分。显微鉴定表明,沈桥变沉积岩中石英动态重结晶型式均表现为完全的亚颗粒旋转(SGR)重结晶,黑云母具有明显的生长边,表明在其形成过程中曾经历了绿帘—角闪岩相变质—变形事件;变沉积岩在露头上显示的韵律层在沉积岩原岩形成时就已经存在,之后经过浅变质作用,岩石中的矿物相发生了改变:原岩中的泥质层变质为颜色较深的层状黑云母,砂质层变质为颜色较浅的动态重结晶石英。

关键词: 大别造山带, 变沉积岩, 锆石定年, 构造演化

Low-grade metamorphic rocks concentrated in the Beihuaiyang unit and were sporadically in other units of the Dabie orogenic belt, whose coexistence with other rocks in the orogenic belt can provide evidence for the evolution of the Dabie orogenic belt. A small number of metasedimentary rocks crop out in the Shenqiao area, northeast of the North Dabie unit. In order to obtain the forming age and provenance of the low-grade metamorphic rocks and their relationship with the rocks in the North Dabie unit, detailed field observations, systematic microscopic identification and detrital zircon LA-ICP MS U-Pb dating were presented for metasedimentary rocks in the Shenqiao area. The results show that metasedimentary rocks in the Shenqiao area have similar petrological characteristics as low-grade metamorphic rocks of the Zhufoan Formation in the Foziling Group. The minimum age of detrital zircon is 431 Ma, which is also similar as the Foziling Group. All these reveal that these low-grade metamorphic rocks in the Shenqiao area may be a part of the Foziling Group. Detailed observations on thin-sections show that quartz are characterized by Subgrain Rotation (SGR) recrystallization and biotite has obvious growth rims, which indicates that the metasedimentary rocks experience an epidote-amphibolite facies metamorphic and deformation event. The rhythmic layers on the outcrop existed before experiencing low-grade metamorphism, during which the argillaceous layer in the protolith transferred to the darker layered biotite and the sandy layer to lighter and recrystallized quartz.

Key words: Dabie orogenic belt, Metasedimentary rocks, Zircon U-Pb dating, Tectonic evolution.

中图分类号: 

图1 大别造山带岳西沈桥地区构造简图及采样位置
(a)秦岭—大别造山带索引图;(b)大别造山带及邻区构造单元划分;1:变沉积岩;2:北大别杂岩;3:主簿源岩体;4:岩脉;5:基性岩浆岩;6:韧性剪切带;7:正断层;8:岩石面理产状;9:采样位置
Fig.1 Structural map of the Shenqiao area in the Dabie orogenic belt and sampling location
(a)Sketch of the Qinling-Dabie-Sulu orogenic belts; (b) Tectonic unit of the Dabie orogenic belt and adjacent region; 1. Metasedimentary rocks;2.Complex rocks in the North Dabie unit; 3.The Zhubuyuan pluton; 4.Dykes; 5.Basic rock; 6.Ductile shear zone;7.Normal fault; 8.Foliation; 9.Sampling location
图1 大别造山带岳西沈桥地区构造简图及采样位置
(a)秦岭—大别造山带索引图;(b)大别造山带及邻区构造单元划分;1:变沉积岩;2:北大别杂岩;3:主簿源岩体;4:岩脉;5:基性岩浆岩;6:韧性剪切带;7:正断层;8:岩石面理产状;9:采样位置
Fig.1 Structural map of the Shenqiao area in the Dabie orogenic belt and sampling location
(a)Sketch of the Qinling-Dabie-Sulu orogenic belts; (b) Tectonic unit of the Dabie orogenic belt and adjacent region; 1. Metasedimentary rocks;2.Complex rocks in the North Dabie unit; 3.The Zhubuyuan pluton; 4.Dykes; 5.Basic rock; 6.Ductile shear zone;7.Normal fault; 8.Foliation; 9.Sampling location
图2 大别造山带内沈桥变沉积岩野外照片和显微照片
(a)韧性变形的二长花岗岩;(b)具韵律层的变沉积岩;(c)风化的二长花岗岩与变沉积岩接触;(d)以捕虏体形式存在于二长花岗岩中的变沉积岩;(e)变形的石英及成带分布的黑云母;(f)变形的石英和具生长边的黑云母
Fig.2 Field photos and photomicrographs of metasedimentary rocks from the Shenqiao area in the Dabie orogenic belt
(a) Ductile deformed monzonitic granite; (b) Metasedimentary rocks with rhythmic texture; (c) The boundary of Weathered monzonitic granite and metasedimentary rocks; (d) Metasedimentary rocks existing in the monzonitic granite as xenolith; (e) Deformed quartz and zoned biotite in metasedimentary rocks; (f) Deformed quartz and biotite with growth edge
图2 大别造山带内沈桥变沉积岩野外照片和显微照片
(a)韧性变形的二长花岗岩;(b)具韵律层的变沉积岩;(c)风化的二长花岗岩与变沉积岩接触;(d)以捕虏体形式存在于二长花岗岩中的变沉积岩;(e)变形的石英及成带分布的黑云母;(f)变形的石英和具生长边的黑云母
Fig.2 Field photos and photomicrographs of metasedimentary rocks from the Shenqiao area in the Dabie orogenic belt
(a) Ductile deformed monzonitic granite; (b) Metasedimentary rocks with rhythmic texture; (c) The boundary of Weathered monzonitic granite and metasedimentary rocks; (d) Metasedimentary rocks existing in the monzonitic granite as xenolith; (e) Deformed quartz and zoned biotite in metasedimentary rocks; (f) Deformed quartz and biotite with growth edge
表1 大别造山带沈桥地区变沉积岩锆石LA-ICP MS U-Pb定年结果
Table 1 Zircon LA-ICP MS U-Pb analysis results of metasediment from the Shenqiao area in the Dabie orogenic belt
测点 U238 Th232 Th/U 同位素比值 年龄(Ma)±1σ
×10-6 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ 208Pb/232Th ±1σ 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th
01 105.2 135.4 0.78 0.05648 0.00259 0.68005 0.0307 0.08759 0.00248 0.02701 0.00094 471±80 527±19 541±15 539±18
02 91.3 443.6 0.21 0.07369 0.00256 1.81606 0.05752 0.17377 0.00465 0.05233 0.00166 1 033±35 1 051±21 1 033±26 1 031±32
03 925.6 1036.4 0.89 0.05527 0.0018 0.56461 0.01836 0.07393 0.00201 0.02277 0.00068 423±41 455±12 460±12 455±13
04 346.8 369.2 0.94 0.16104 0.00508 10.10776 0.30945 0.4544 0.01207 0.12452 0.00362 2 467±26 2 445±28 2 415±54 2 372±65
05 33.0 938.7 0.04 0.0698 0.00232 1.41089 0.05052 0.14614 0.00448 0.04403 0.00196 922±39 894±21 879±25 871±38
06 217.6 602.2 0.36 0.20893 0.00678 15.17866 0.50123 0.52413 0.01427 0.1436 0.00426 2 897±31 2 827±31 2 717±60 2 712±75
07 187.5 335.2 0.56 0.06606 0.00248 1.23826 0.04262 0.13186 0.00368 0.04131 0.00125 808±43 818±19 798±21 818±24
08 76.1 86.2 0.88 0.06693 0.00281 1.34655 0.05903 0.14599 0.0049 0.04484 0.00145 836±60 866±26 878±28 887±28
09 144.4 208.2 0.69 0.14345 0.00585 8.94437 0.28678 0.44539 0.01241 0.12221 0.00362 2 269±28 2 332±29 2 375±55 2 330±65
10 165.6 290.1 0.57 0.07152 0.00236 1.7964 0.0573 0.18133 0.0048 0.05552 0.0017 972±37 1 044±21 1 074±26 1 092±32
11 158.9 218.9 0.73 0.05413 0.00263 0.53679 0.02265 0.06934 0.00194 0.02111 0.00068 377±73 436±15 432±12 422±13
12 92.4 238.0 0.39 0.09825 0.00451 3.33647 0.10916 0.24269 0.0072 0.07492 0.00228 1 591±26 1 490±26 1 401±37 1 460±43
13 134.7 310.3 0.43 0.24405 0.00758 20.37187 0.64107 0.60115 0.01629 0.15645 0.00467 3 147±26 3 109±30 3 034±66 2 938±82
14 319.2 338.0 0.94 0.05948 0.0024 0.68244 0.02746 0.08308 0.00241 0.02528 0.00078 585±62 528±17 514±14 505±15
15 364.8 433.1 0.84 0.10773 0.00469 4.71843 0.17492 0.30806 0.00989 0.08669 0.00276 1 761±35 1 771±31 1 731±49 1 680±51
16 170.7 1909.4 0.09 0.05824 0.00287 0.48748 0.01912 0.06071 0.00182 0.01881 0.00056 539±111 403±13 380±11 377±11
17 287.0 480.3 0.60 0.07879 0.00285 2.20616 0.08713 0.20161 0.00576 0.06398 0.002 1 167±55 1 183±28 1 184±31 1 253±38
18 340.3 445.4 0.76 0.05539 0.00275 0.67335 0.02899 0.08403 0.00273 0.02667 0.00083 428±64 523±18 520±16 532±16
19 83.0 334.9 0.25 0.05476 0.00254 0.71964 0.02782 0.08581 0.00264 0.02877 0.00106 402±54 550±16 531±16 573±21
20 111.4 1369.9 0.08 0.07738 0.00332 1.65878 0.05466 0.15548 0.00428 0.04666 0.00128 1 131±88 993±21 932±24 922±25
21 273.4 685.9 0.40 0.07374 0.00263 1.5334 0.05715 0.15074 0.00476 0.04615 0.00148 1 034±41 944±23 905±27 912±29
22 987.3 2659.8 0.37 0.0581 0.00179 0.7009 0.02201 0.08718 0.0025 0.02517 0.00074 534±29 539±13 539±15 502±15
23 561.0 760.1 0.74 0.06079 0.00211 0.62428 0.0207 0.07446 0.0022 0.02012 0.00072 632±33 493±13 463±13 403±14
24 304.4 810.5 0.38 0.07406 0.00236 1.81698 0.05619 0.1769 0.00485 0.04938 0.00149 1 043±30 1 052±20 1 050±27 974±29
25 78.4 89.5 0.88 0.07033 0.0034 1.65912 0.07506 0.16376 0.0048 0.04785 0.00161 938±72 993±29 978±27 945±31
26 221.8 611.3 0.36 0.05717 0.00225 0.55671 0.02046 0.06918 0.00194 0.02093 0.00068 498±54 449±13 431±12 419±14
27 24.5 43.1 0.57 0.21353 0.00826 17.25944 0.58475 0.56932 0.01712 0.14526 0.00474 2 933±26 2 949±33 2 905±70 2 741±84
28 286.5 536.1 0.53 0.06624 0.00231 1.28659 0.04085 0.13868 0.0038 0.04142 0.00121 814±34 840±18 837±22 820±24
29 371.4 614.8 0.60 0.31166 0.00932 30.35906 0.92707 0.70378 0.01947 0.17144 0.00521 3 529±20 3 499±30 3 435±74 3 198±90
30 56.2 644.8 0.09 0.07403 0.0024 1.66131 0.06014 0.16147 0.00475 0.05543 0.00204 1 042±44 994±23 965±26 1 090±39
31 28.1 23.1 1.22 0.14932 0.00651 9.27236 0.35212 0.43311 0.01348 0.12155 0.00385 2 338±38 2 365±35 2 320±61 2 319±69
32 128.7 328.5 0.39 0.07151 0.00263 1.72432 0.05598 0.16737 0.00457 0.04743 0.00148 972±37 1 018±21 998±25 937±29
33 27.2 60.6 0.45 0.07565 0.00345 1.80908 0.0837 0.17447 0.00557 0.05456 0.00212 1 086±69 1 049±30 1 037±31 1 074±41
34 333.5 661.7 0.50 0.07203 0.00249 1.8119 0.0587 0.17747 0.00498 0.04794 0.00143 987±34 1 050±21 1 053±27 946±27
35 83.4 272.8 0.31 0.11709 0.00387 5.94307 0.28643 0.36581 0.01563 0.1012 0.00533 1 912±41 1 968±42 2 010±74 1 949±98
36 434.8 1246.0 0.35 0.2363 0.00766 19.83641 0.60205 0.60071 0.01708 0.15555 0.00459 3 095±17 3 083±29 3 033±69 2 922±80
37 552.8 635.3 0.87 0.09145 0.00288 3.1251 0.10205 0.24708 0.00708 0.06926 0.00202 1 456±31 1 439±25 1 423±37 1 353±38
38 191.0 227.1 0.84 0.05964 0.00237 0.73917 0.02905 0.08979 0.00246 0.02654 0.00082 591±63 562±17 554±15 529±16
39 127.8 438.7 0.29 0.05794 0.00217 0.56393 0.02031 0.0704 0.00186 0.02058 0.00069 527±55 454±13 439±11 412±14
40 186.9 256.1 0.73 0.16374 0.00512 10.37129 0.32081 0.45611 0.01226 0.12065 0.00373 2 495±26 2 468±29 2 422±54 2 302±67
41 106.2 155.0 0.69 0.0702 0.00261 1.53165 0.05426 0.15933 0.00457 0.04735 0.0015 934±44 943±22 953±25 935±29
42 184.0 298.1 0.62 0.1101 0.0037 4.58318 0.1402 0.29895 0.00792 0.08522 0.00252 1 801±28 1 746±25 1 686±39 1 653±47
43 63.0 135.4 0.47 0.27081 0.00841 23.25844 0.70255 0.61926 0.01664 0.16022 0.005 3 311±22 3 238±29 3 107±66 3 004±87
测点 U238 Th232 Th/U 同位素比值 年龄(Ma)±1σ
×10-6 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ 208Pb/232Th ±1σ 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th
44 499.0 1313.9 0.38 0.07192 0.0022 1.75384 0.0546 0.17631 0.0048 0.05019 0.00146 984±32 1 029±20 1 047±26 990±28
45 65.4 1036.0 0.06 0.07084 0.00235 1.3189 0.04342 0.13406 0.00367 0.04205 0.00143 953±38 854±19 811±21 833±28
46 104.5 231.4 0.45 0.059 0.0027 0.60472 0.0262 0.07447 0.00209 0.0233 0.00082 567±74 480±17 463±13 465±16
47 344.6 328.8 1.05 0.07208 0.0024 1.64724 0.05263 0.16506 0.00436 0.04779 0.00142 988±37 988±20 985±24 944±27
48 71.7 161.7 0.44 0.06588 0.00253 1.09714 0.04097 0.12061 0.00327 0.03691 0.00124 802±55 752±20 734±19 733±24
49 304.1 599.4 0.51 0.18281 0.00604 11.5023 0.34024 0.45389 0.01199 0.12072 0.00349 2 679±23 2 565±28 2 413±53 2 304±63
50 48.3 148.9 0.32 0.05328 0.00253 0.52388 0.02373 0.07136 0.00197 0.02346 0.00089 341±83 428±16 444±12 469±18
51 101.5 731.6 0.14 0.05713 0.00196 0.5589 0.01883 0.07074 0.00189 0.02168 0.00079 497±46 451±12 441±11 434±16
52 225.8 382.4 0.59 0.06934 0.00268 1.60482 0.05374 0.166 0.00475 0.04933 0.00147 909±37 972±21 990±26 973±28
53 290.9 130.1 2.24 0.06501 0.00347 0.86063 0.03752 0.09659 0.00299 0.0124 0.00039 775±66 630±20 594±18 249±8
54 58.3 84.7 0.69 0.07472 0.00326 1.65251 0.07148 0.16044 0.00451 0.04799 0.00168 1 061±68 991±27 959±25 947±32
55 176.5 603.8 0.29 0.06776 0.00229 1.32336 0.04434 0.14102 0.00372 0.04101 0.00127 861±44 856±19 850±21 812±25
56 346.3 396.5 0.87 0.09778 0.00349 3.78914 0.13294 0.28156 0.0085 0.08053 0.00258 1 582±34 1 590±28 1 599±43 1 566±48
57 83.4 156.7 0.53 0.09847 0.0042 4.13399 0.1588 0.2911 0.0097 0.08655 0.00279 1 595±36 1 661±31 1 647±48 1 678±52
58 111.3 130.2 0.85 0.09976 0.0043 4.30876 0.17693 0.29975 0.0105 0.08811 0.00291 1 620±41 1 695±34 1 690±52 1 707±54
59 65.1 299.0 0.22 0.07506 0.00281 1.99306 0.07284 0.18765 0.00593 0.05536 0.00181 1 070±38 1 113±25 1 109±32 1 089±35
60 71.1 136.1 0.52 0.06532 0.00271 1.27632 0.05231 0.14151 0.00444 0.04255 0.00151 785±57 835±23 853±25 842±29
61 62.6 92.6 0.68 0.071 0.00778 1.63906 0.16331 0.16743 0.00761 0.05072 0.00208 957±234 985±63 998±42 1 000±40
62 48.0 93.0 0.52 0.10601 0.00462 4.56498 0.18496 0.30931 0.01019 0.08826 0.00298 1 732±44 1 743±34 1 737±50 1 709±55
63 69.9 104.7 0.67 0.15412 0.00627 9.42084 0.34076 0.45196 0.01531 0.13228 0.00464 2 392±22 2 380±33 2 404±68 2 511±83
64 274.3 699.2 0.39 0.05452 0.00192 0.57114 0.02531 0.0757 0.00261 0.02348 0.00077 392±64 459±16 470±16 469±15
65 310.6 520.2 0.60 0.09376 0.00404 3.63467 0.14642 0.26614 0.00921 0.09028 0.00291 1 503±40 1 557±32 1 521±47 1 747±54
66 256.0 150.0 1.71 0.064 0.00284 1.15934 0.05112 0.1331 0.00454 0.04063 0.00135 742±60 782±24 806±26 805±26
67 461.6 892.7 0.52 0.05865 0.00199 0.80012 0.02909 0.09828 0.00276 0.02882 0.00088 554±51 597±16 604±16 574±17
68 998.8 2727.6 0.37 0.05532 0.00173 0.62551 0.02134 0.0821 0.00258 0.02407 0.00075 425±30 493±13 509±15 481±15
69 104.7 219.8 0.48 0.05448 0.00262 0.55926 0.02737 0.07258 0.00237 0.02482 0.00094 391±84 451±18 452±14 495±19
70 464.4 361.0 1.29 0.15727 0.00522 9.70807 0.3189 0.44882 0.01359 0.11659 0.00434 2 427±22 2 407±30 2 390±60 2 229±79
71 114.2 397.3 0.29 0.05738 0.00222 0.54216 0.02118 0.06925 0.0022 0.01993 0.00069 506±51 440±14 432±13 399±14
72 89.0 1118.7 0.08 0.06577 0.00229 1.32598 0.04822 0.14191 0.00481 0.0456 0.00174 799±28 857±21 855±27 901±34
73 75.8 97.1 0.78 0.06886 0.00305 1.84066 0.07172 0.18706 0.0065 0.05422 0.0018 895±37 1 060±26 1 105±35 1 067±35
74 362.7 651.5 0.56 0.06751 0.00225 1.44788 0.04925 0.15552 0.00462 0.04483 0.00137 853±35 909±20 932±26 886±27
75 37.4 69.7 0.54 0.06551 0.003 1.21987 0.05516 0.13672 0.00445 0.04057 0.00165 791±67 810±25 826±25 804±32
76 82.4 67.9 1.21 0.06412 0.00326 1.15336 0.05778 0.13186 0.00442 0.03865 0.00146 746±81 779±27 798±25 767±28
77 470.3 623.7 0.75 0.06561 0.00257 1.38409 0.04787 0.14754 0.00433 0.03944 0.00125 794±39 882±20 887±24 782±24
78 90.4 278.1 0.32 0.11727 0.00435 5.24953 0.18263 0.32561 0.01027 0.09324 0.00283 1 915±27 1 861±30 1 817±50 1 802±52
79 268.7 217.3 1.24 0.06392 0.00242 1.08634 0.04212 0.12316 0.00379 0.03435 0.00104 739±51 747±21 749±22 683±20
80 151.5 139.6 1.09 0.06292 0.003 1.27261 0.05468 0.14468 0.00482 0.04075 0.00144 706±59 834±24 871±27 807±28
81 436.6 675.1 0.65 0.05662 0.00213 0.54533 0.02102 0.06971 0.0021 0.02009 0.00064 477±54 442±14 434±13 402±13
82 39.8 41.3 0.97 0.14975 0.00586 9.2361 0.33623 0.45296 0.01405 0.12378 0.004 2 343±33 2 362±33 2 408±62 2 359±72
83 64.9 112.4 0.58 0.15483 0.00577 10.02239 0.33838 0.45512 0.01358 0.1295 0.00414 2 400±28 2 437±31 2 418±60 2 461±74
84 139.2 147.5 0.94 0.09108 0.00359 3.20584 0.11362 0.24582 0.00724 0.07195 0.00228 1 448±38 1 459±27 1 417±37 1 404±43
85 127.9 183.9 0.70 0.15548 0.00503 9.68734 0.36137 0.454 0.01628 0.12439 0.00409 2 407±18 2 406±34 2 413±72 2 370±73
86 650.4 1032.5 0.63 0.05148 0.00182 0.50521 0.01872 0.07129 0.00213 0.02217 0.00071 262±52 415±13 444±13 443±14
87 411.4 316.1 1.30 0.06178 0.0023 1.05193 0.03987 0.12362 0.00356 0.03836 0.00124 667±54 730±20 751±20 761±24
88 50.3 181.7 0.28 0.06676 0.00249 1.44448 0.05749 0.15764 0.00533 0.04598 0.00168 830±45 908±24 944±30 909±33
89 218.7 292.4 0.75 0.07979 0.00283 2.53487 0.0957 0.22145 0.00661 0.0661 0.00202 1 192±47 1 282±27 1 290±35 1 294±38
90 324.3 513.2 0.63 0.06259 0.0024 1.12538 0.03905 0.12711 0.00364 0.03746 0.00116 694±43 766±19 771±21 743±23
91 75.1 223.3 0.34 0.06945 0.00259 1.35489 0.04892 0.14165 0.00399 0.04169 0.00133 912±48 870±21 854±23 826±26
92 407.6 193.9 2.10 0.06498 0.00261 1.20286 0.05039 0.13402 0.00431 0.04044 0.0013 774±58 802±23 811±25 801±25
93 210.7 181.4 1.16 0.06677 0.00276 1.09137 0.04247 0.12016 0.00422 0.03487 0.00104 831±36 749±21 732±24 693±20
94 65.7 687.7 0.10 0.06758 0.00221 1.43242 0.05029 0.15362 0.00477 0.0468 0.00157 856±35 903±21 921±27 925±30
95 36.6 1585.6 0.02 0.06105 0.00222 0.84757 0.03136 0.10056 0.00299 0.02935 0.00121 641±48 623±17 618±18 585±24
96 104.9 276.9 0.38 0.11681 0.00384 5.28905 0.18679 0.32688 0.00962 0.08993 0.00286 1 908±36 1 867±30 1 823±47 1 741±53
表1 大别造山带沈桥地区变沉积岩锆石LA-ICP MS U-Pb定年结果
Table 1 Zircon LA-ICP MS U-Pb analysis results of metasediment from the Shenqiao area in the Dabie orogenic belt
测点 U238 Th232 Th/U 同位素比值 年龄(Ma)±1σ
×10-6 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ 208Pb/232Th ±1σ 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th
01 105.2 135.4 0.78 0.05648 0.00259 0.68005 0.0307 0.08759 0.00248 0.02701 0.00094 471±80 527±19 541±15 539±18
02 91.3 443.6 0.21 0.07369 0.00256 1.81606 0.05752 0.17377 0.00465 0.05233 0.00166 1 033±35 1 051±21 1 033±26 1 031±32
03 925.6 1036.4 0.89 0.05527 0.0018 0.56461 0.01836 0.07393 0.00201 0.02277 0.00068 423±41 455±12 460±12 455±13
04 346.8 369.2 0.94 0.16104 0.00508 10.10776 0.30945 0.4544 0.01207 0.12452 0.00362 2 467±26 2 445±28 2 415±54 2 372±65
05 33.0 938.7 0.04 0.0698 0.00232 1.41089 0.05052 0.14614 0.00448 0.04403 0.00196 922±39 894±21 879±25 871±38
06 217.6 602.2 0.36 0.20893 0.00678 15.17866 0.50123 0.52413 0.01427 0.1436 0.00426 2 897±31 2 827±31 2 717±60 2 712±75
07 187.5 335.2 0.56 0.06606 0.00248 1.23826 0.04262 0.13186 0.00368 0.04131 0.00125 808±43 818±19 798±21 818±24
08 76.1 86.2 0.88 0.06693 0.00281 1.34655 0.05903 0.14599 0.0049 0.04484 0.00145 836±60 866±26 878±28 887±28
09 144.4 208.2 0.69 0.14345 0.00585 8.94437 0.28678 0.44539 0.01241 0.12221 0.00362 2 269±28 2 332±29 2 375±55 2 330±65
10 165.6 290.1 0.57 0.07152 0.00236 1.7964 0.0573 0.18133 0.0048 0.05552 0.0017 972±37 1 044±21 1 074±26 1 092±32
11 158.9 218.9 0.73 0.05413 0.00263 0.53679 0.02265 0.06934 0.00194 0.02111 0.00068 377±73 436±15 432±12 422±13
12 92.4 238.0 0.39 0.09825 0.00451 3.33647 0.10916 0.24269 0.0072 0.07492 0.00228 1 591±26 1 490±26 1 401±37 1 460±43
13 134.7 310.3 0.43 0.24405 0.00758 20.37187 0.64107 0.60115 0.01629 0.15645 0.00467 3 147±26 3 109±30 3 034±66 2 938±82
14 319.2 338.0 0.94 0.05948 0.0024 0.68244 0.02746 0.08308 0.00241 0.02528 0.00078 585±62 528±17 514±14 505±15
15 364.8 433.1 0.84 0.10773 0.00469 4.71843 0.17492 0.30806 0.00989 0.08669 0.00276 1 761±35 1 771±31 1 731±49 1 680±51
16 170.7 1909.4 0.09 0.05824 0.00287 0.48748 0.01912 0.06071 0.00182 0.01881 0.00056 539±111 403±13 380±11 377±11
17 287.0 480.3 0.60 0.07879 0.00285 2.20616 0.08713 0.20161 0.00576 0.06398 0.002 1 167±55 1 183±28 1 184±31 1 253±38
18 340.3 445.4 0.76 0.05539 0.00275 0.67335 0.02899 0.08403 0.00273 0.02667 0.00083 428±64 523±18 520±16 532±16
19 83.0 334.9 0.25 0.05476 0.00254 0.71964 0.02782 0.08581 0.00264 0.02877 0.00106 402±54 550±16 531±16 573±21
20 111.4 1369.9 0.08 0.07738 0.00332 1.65878 0.05466 0.15548 0.00428 0.04666 0.00128 1 131±88 993±21 932±24 922±25
21 273.4 685.9 0.40 0.07374 0.00263 1.5334 0.05715 0.15074 0.00476 0.04615 0.00148 1 034±41 944±23 905±27 912±29
22 987.3 2659.8 0.37 0.0581 0.00179 0.7009 0.02201 0.08718 0.0025 0.02517 0.00074 534±29 539±13 539±15 502±15
23 561.0 760.1 0.74 0.06079 0.00211 0.62428 0.0207 0.07446 0.0022 0.02012 0.00072 632±33 493±13 463±13 403±14
24 304.4 810.5 0.38 0.07406 0.00236 1.81698 0.05619 0.1769 0.00485 0.04938 0.00149 1 043±30 1 052±20 1 050±27 974±29
25 78.4 89.5 0.88 0.07033 0.0034 1.65912 0.07506 0.16376 0.0048 0.04785 0.00161 938±72 993±29 978±27 945±31
26 221.8 611.3 0.36 0.05717 0.00225 0.55671 0.02046 0.06918 0.00194 0.02093 0.00068 498±54 449±13 431±12 419±14
27 24.5 43.1 0.57 0.21353 0.00826 17.25944 0.58475 0.56932 0.01712 0.14526 0.00474 2 933±26 2 949±33 2 905±70 2 741±84
28 286.5 536.1 0.53 0.06624 0.00231 1.28659 0.04085 0.13868 0.0038 0.04142 0.00121 814±34 840±18 837±22 820±24
29 371.4 614.8 0.60 0.31166 0.00932 30.35906 0.92707 0.70378 0.01947 0.17144 0.00521 3 529±20 3 499±30 3 435±74 3 198±90
30 56.2 644.8 0.09 0.07403 0.0024 1.66131 0.06014 0.16147 0.00475 0.05543 0.00204 1 042±44 994±23 965±26 1 090±39
31 28.1 23.1 1.22 0.14932 0.00651 9.27236 0.35212 0.43311 0.01348 0.12155 0.00385 2 338±38 2 365±35 2 320±61 2 319±69
32 128.7 328.5 0.39 0.07151 0.00263 1.72432 0.05598 0.16737 0.00457 0.04743 0.00148 972±37 1 018±21 998±25 937±29
33 27.2 60.6 0.45 0.07565 0.00345 1.80908 0.0837 0.17447 0.00557 0.05456 0.00212 1 086±69 1 049±30 1 037±31 1 074±41
34 333.5 661.7 0.50 0.07203 0.00249 1.8119 0.0587 0.17747 0.00498 0.04794 0.00143 987±34 1 050±21 1 053±27 946±27
35 83.4 272.8 0.31 0.11709 0.00387 5.94307 0.28643 0.36581 0.01563 0.1012 0.00533 1 912±41 1 968±42 2 010±74 1 949±98
36 434.8 1246.0 0.35 0.2363 0.00766 19.83641 0.60205 0.60071 0.01708 0.15555 0.00459 3 095±17 3 083±29 3 033±69 2 922±80
37 552.8 635.3 0.87 0.09145 0.00288 3.1251 0.10205 0.24708 0.00708 0.06926 0.00202 1 456±31 1 439±25 1 423±37 1 353±38
38 191.0 227.1 0.84 0.05964 0.00237 0.73917 0.02905 0.08979 0.00246 0.02654 0.00082 591±63 562±17 554±15 529±16
39 127.8 438.7 0.29 0.05794 0.00217 0.56393 0.02031 0.0704 0.00186 0.02058 0.00069 527±55 454±13 439±11 412±14
40 186.9 256.1 0.73 0.16374 0.00512 10.37129 0.32081 0.45611 0.01226 0.12065 0.00373 2 495±26 2 468±29 2 422±54 2 302±67
41 106.2 155.0 0.69 0.0702 0.00261 1.53165 0.05426 0.15933 0.00457 0.04735 0.0015 934±44 943±22 953±25 935±29
42 184.0 298.1 0.62 0.1101 0.0037 4.58318 0.1402 0.29895 0.00792 0.08522 0.00252 1 801±28 1 746±25 1 686±39 1 653±47
43 63.0 135.4 0.47 0.27081 0.00841 23.25844 0.70255 0.61926 0.01664 0.16022 0.005 3 311±22 3 238±29 3 107±66 3 004±87
测点 U238 Th232 Th/U 同位素比值 年龄(Ma)±1σ
×10-6 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ 208Pb/232Th ±1σ 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th
44 499.0 1313.9 0.38 0.07192 0.0022 1.75384 0.0546 0.17631 0.0048 0.05019 0.00146 984±32 1 029±20 1 047±26 990±28
45 65.4 1036.0 0.06 0.07084 0.00235 1.3189 0.04342 0.13406 0.00367 0.04205 0.00143 953±38 854±19 811±21 833±28
46 104.5 231.4 0.45 0.059 0.0027 0.60472 0.0262 0.07447 0.00209 0.0233 0.00082 567±74 480±17 463±13 465±16
47 344.6 328.8 1.05 0.07208 0.0024 1.64724 0.05263 0.16506 0.00436 0.04779 0.00142 988±37 988±20 985±24 944±27
48 71.7 161.7 0.44 0.06588 0.00253 1.09714 0.04097 0.12061 0.00327 0.03691 0.00124 802±55 752±20 734±19 733±24
49 304.1 599.4 0.51 0.18281 0.00604 11.5023 0.34024 0.45389 0.01199 0.12072 0.00349 2 679±23 2 565±28 2 413±53 2 304±63
50 48.3 148.9 0.32 0.05328 0.00253 0.52388 0.02373 0.07136 0.00197 0.02346 0.00089 341±83 428±16 444±12 469±18
51 101.5 731.6 0.14 0.05713 0.00196 0.5589 0.01883 0.07074 0.00189 0.02168 0.00079 497±46 451±12 441±11 434±16
52 225.8 382.4 0.59 0.06934 0.00268 1.60482 0.05374 0.166 0.00475 0.04933 0.00147 909±37 972±21 990±26 973±28
53 290.9 130.1 2.24 0.06501 0.00347 0.86063 0.03752 0.09659 0.00299 0.0124 0.00039 775±66 630±20 594±18 249±8
54 58.3 84.7 0.69 0.07472 0.00326 1.65251 0.07148 0.16044 0.00451 0.04799 0.00168 1 061±68 991±27 959±25 947±32
55 176.5 603.8 0.29 0.06776 0.00229 1.32336 0.04434 0.14102 0.00372 0.04101 0.00127 861±44 856±19 850±21 812±25
56 346.3 396.5 0.87 0.09778 0.00349 3.78914 0.13294 0.28156 0.0085 0.08053 0.00258 1 582±34 1 590±28 1 599±43 1 566±48
57 83.4 156.7 0.53 0.09847 0.0042 4.13399 0.1588 0.2911 0.0097 0.08655 0.00279 1 595±36 1 661±31 1 647±48 1 678±52
58 111.3 130.2 0.85 0.09976 0.0043 4.30876 0.17693 0.29975 0.0105 0.08811 0.00291 1 620±41 1 695±34 1 690±52 1 707±54
59 65.1 299.0 0.22 0.07506 0.00281 1.99306 0.07284 0.18765 0.00593 0.05536 0.00181 1 070±38 1 113±25 1 109±32 1 089±35
60 71.1 136.1 0.52 0.06532 0.00271 1.27632 0.05231 0.14151 0.00444 0.04255 0.00151 785±57 835±23 853±25 842±29
61 62.6 92.6 0.68 0.071 0.00778 1.63906 0.16331 0.16743 0.00761 0.05072 0.00208 957±234 985±63 998±42 1 000±40
62 48.0 93.0 0.52 0.10601 0.00462 4.56498 0.18496 0.30931 0.01019 0.08826 0.00298 1 732±44 1 743±34 1 737±50 1 709±55
63 69.9 104.7 0.67 0.15412 0.00627 9.42084 0.34076 0.45196 0.01531 0.13228 0.00464 2 392±22 2 380±33 2 404±68 2 511±83
64 274.3 699.2 0.39 0.05452 0.00192 0.57114 0.02531 0.0757 0.00261 0.02348 0.00077 392±64 459±16 470±16 469±15
65 310.6 520.2 0.60 0.09376 0.00404 3.63467 0.14642 0.26614 0.00921 0.09028 0.00291 1 503±40 1 557±32 1 521±47 1 747±54
66 256.0 150.0 1.71 0.064 0.00284 1.15934 0.05112 0.1331 0.00454 0.04063 0.00135 742±60 782±24 806±26 805±26
67 461.6 892.7 0.52 0.05865 0.00199 0.80012 0.02909 0.09828 0.00276 0.02882 0.00088 554±51 597±16 604±16 574±17
68 998.8 2727.6 0.37 0.05532 0.00173 0.62551 0.02134 0.0821 0.00258 0.02407 0.00075 425±30 493±13 509±15 481±15
69 104.7 219.8 0.48 0.05448 0.00262 0.55926 0.02737 0.07258 0.00237 0.02482 0.00094 391±84 451±18 452±14 495±19
70 464.4 361.0 1.29 0.15727 0.00522 9.70807 0.3189 0.44882 0.01359 0.11659 0.00434 2 427±22 2 407±30 2 390±60 2 229±79
71 114.2 397.3 0.29 0.05738 0.00222 0.54216 0.02118 0.06925 0.0022 0.01993 0.00069 506±51 440±14 432±13 399±14
72 89.0 1118.7 0.08 0.06577 0.00229 1.32598 0.04822 0.14191 0.00481 0.0456 0.00174 799±28 857±21 855±27 901±34
73 75.8 97.1 0.78 0.06886 0.00305 1.84066 0.07172 0.18706 0.0065 0.05422 0.0018 895±37 1 060±26 1 105±35 1 067±35
74 362.7 651.5 0.56 0.06751 0.00225 1.44788 0.04925 0.15552 0.00462 0.04483 0.00137 853±35 909±20 932±26 886±27
75 37.4 69.7 0.54 0.06551 0.003 1.21987 0.05516 0.13672 0.00445 0.04057 0.00165 791±67 810±25 826±25 804±32
76 82.4 67.9 1.21 0.06412 0.00326 1.15336 0.05778 0.13186 0.00442 0.03865 0.00146 746±81 779±27 798±25 767±28
77 470.3 623.7 0.75 0.06561 0.00257 1.38409 0.04787 0.14754 0.00433 0.03944 0.00125 794±39 882±20 887±24 782±24
78 90.4 278.1 0.32 0.11727 0.00435 5.24953 0.18263 0.32561 0.01027 0.09324 0.00283 1 915±27 1 861±30 1 817±50 1 802±52
79 268.7 217.3 1.24 0.06392 0.00242 1.08634 0.04212 0.12316 0.00379 0.03435 0.00104 739±51 747±21 749±22 683±20
80 151.5 139.6 1.09 0.06292 0.003 1.27261 0.05468 0.14468 0.00482 0.04075 0.00144 706±59 834±24 871±27 807±28
81 436.6 675.1 0.65 0.05662 0.00213 0.54533 0.02102 0.06971 0.0021 0.02009 0.00064 477±54 442±14 434±13 402±13
82 39.8 41.3 0.97 0.14975 0.00586 9.2361 0.33623 0.45296 0.01405 0.12378 0.004 2 343±33 2 362±33 2 408±62 2 359±72
83 64.9 112.4 0.58 0.15483 0.00577 10.02239 0.33838 0.45512 0.01358 0.1295 0.00414 2 400±28 2 437±31 2 418±60 2 461±74
84 139.2 147.5 0.94 0.09108 0.00359 3.20584 0.11362 0.24582 0.00724 0.07195 0.00228 1 448±38 1 459±27 1 417±37 1 404±43
85 127.9 183.9 0.70 0.15548 0.00503 9.68734 0.36137 0.454 0.01628 0.12439 0.00409 2 407±18 2 406±34 2 413±72 2 370±73
86 650.4 1032.5 0.63 0.05148 0.00182 0.50521 0.01872 0.07129 0.00213 0.02217 0.00071 262±52 415±13 444±13 443±14
87 411.4 316.1 1.30 0.06178 0.0023 1.05193 0.03987 0.12362 0.00356 0.03836 0.00124 667±54 730±20 751±20 761±24
88 50.3 181.7 0.28 0.06676 0.00249 1.44448 0.05749 0.15764 0.00533 0.04598 0.00168 830±45 908±24 944±30 909±33
89 218.7 292.4 0.75 0.07979 0.00283 2.53487 0.0957 0.22145 0.00661 0.0661 0.00202 1 192±47 1 282±27 1 290±35 1 294±38
90 324.3 513.2 0.63 0.06259 0.0024 1.12538 0.03905 0.12711 0.00364 0.03746 0.00116 694±43 766±19 771±21 743±23
91 75.1 223.3 0.34 0.06945 0.00259 1.35489 0.04892 0.14165 0.00399 0.04169 0.00133 912±48 870±21 854±23 826±26
92 407.6 193.9 2.10 0.06498 0.00261 1.20286 0.05039 0.13402 0.00431 0.04044 0.0013 774±58 802±23 811±25 801±25
93 210.7 181.4 1.16 0.06677 0.00276 1.09137 0.04247 0.12016 0.00422 0.03487 0.00104 831±36 749±21 732±24 693±20
94 65.7 687.7 0.10 0.06758 0.00221 1.43242 0.05029 0.15362 0.00477 0.0468 0.00157 856±35 903±21 921±27 925±30
95 36.6 1585.6 0.02 0.06105 0.00222 0.84757 0.03136 0.10056 0.00299 0.02935 0.00121 641±48 623±17 618±18 585±24
96 104.9 276.9 0.38 0.11681 0.00384 5.28905 0.18679 0.32688 0.00962 0.08993 0.00286 1 908±36 1 867±30 1 823±47 1 741±53
图3 沈桥变沉积岩碎屑锆石U-Pb年龄谐和图、年龄分布频谱图及Th/U比
Fig.3 Zircon U-Pb concordia diagram, histogram and Th/U ratio for the metasedimentary rocks from the Shenqiao area
图3 沈桥变沉积岩碎屑锆石U-Pb年龄谐和图、年龄分布频谱图及Th/U比
Fig.3 Zircon U-Pb concordia diagram, histogram and Th/U ratio for the metasedimentary rocks from the Shenqiao area
图4 沈桥变沉积岩周边地区锆石年龄频谱特征
佛子岭群年龄数据据参考文献[ 9 , 10 , 11 ];华北克拉通东南缘年龄数据据参考文献[ 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 ];扬子板块数据据参考文献[ 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ]
Fig.4 Compilations of concordant zircon U-Pb ages around the metasedimentary rocks in the Shenqiao area
The age data of the Foziling Group from references[9~11], the southeastern North China Block from references[39~46] and the Yangtze Block from references[47~55]
图4 沈桥变沉积岩周边地区锆石年龄频谱特征
佛子岭群年龄数据据参考文献[ 9 , 10 , 11 ];华北克拉通东南缘年龄数据据参考文献[ 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 ];扬子板块数据据参考文献[ 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ]
Fig.4 Compilations of concordant zircon U-Pb ages around the metasedimentary rocks in the Shenqiao area
The age data of the Foziling Group from references[9~11], the southeastern North China Block from references[39~46] and the Yangtze Block from references[47~55]
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