SHRIMP U-Pb Dating of Greenschist from Dashuigou Schiefer, Shimian County, Shichuan Province and Its Geological Significance
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摘要: 大水沟岩片位于安宁河深大断裂带中段, 川西松潘甘孜造山带与扬子地台结合部位, 因其特殊的构造位置和赋存碲矿床而备受重视.运用SRHIMP U-Pb定年技术对大水沟绿片岩进行年龄测试, 来确定大水沟岩片的形成时代, 为大水沟周缘石棉-冕宁一带乃至川西扬子地台西缘的构造岩浆演化提供有益信息, 同时为大水沟碲铋矿床的形成时代提供线索.大水沟原岩恢复表明其应当有相当部分为沉积岩, 运用SHRIMP U-Pb定年从中获得的5种不同年龄段具有内部结构、外观特征的锆石差异.2467~2358Ma年龄的残留碎屑岩浆锆石说明扬子地台西缘存在太古代-古元古代的物源搬运; 790.5~762.5Ma的岩浆锆石与新元古代早期Rodinia超大陆裂解、地幔柱上涌时的岩浆事件有关; 696.8~642.9Ma锆石年龄反映了大水沟周缘碰撞造山和后造山期岩浆活动和变质作用; 伴随峨眉地裂大规模基性岩浆活动, 在大水沟近源很可能有262.0~220.0Ma碱性杂岩的侵入; 典型热液增生锆石216.5~167.1Ma年龄揭示了该区中侏罗世大规模的岩浆期后热液活动.大水沟岩片可能为异地推覆系统, 岩浆锆石年龄和热液增生锆石年龄限制了大水沟岩片总体定位于220.0~167.1Ma之间.Abstract: Located at the central of the Anning River discordogenic fault, the binding site of the Songpan-Ganze orogenic belt and the Yangtze block, Dashuigou schiefer has attracted increasing attention of researchers regarding to its special tectonic site and the occurred tellurium deposit. In order to provide chronologic evidences for reconstructing tectonic and magmatic geochronic evolution of areas around Dashuigou and the western margin of the Yangtze block in Shichuan, as well as for locating time of Dashuigou schiefer, zircon ages of the greenschist from Dashuigou were determined by SHRIMP U-Pb dating technique. Five age groups of the zircons with different characteristics of inner texture and cosmetics are obtained and subdivided from the greenschist of Dashuigou schiefer which should contain great proportions of sediments in the protolith. Ages of 2467-2430Ma from remained detrital magma zircons shows the mass transportation of Archaean-early proterozoic basement, whereas ages of 790.5-762.5Ma probably represent the magmatic event around Dashuigou on the background of Rodinia crack and upwelling mantle in early neoproterozoic. Metamorphism and magmation generated by orogenics and post orogenics are documented by ages of 696.8-642.9Ma from the magmatic zircons. Zircons of 262.0-220.0Ma ages are inferred to have been originated from alkalic rock nearby related to the Emeishan movement.216.5-167.1Ma ages of typical new growth and re-crystallized zircons caused by hydrothermal alteration reveal the post-magmatic hydrothermal activity. Dashuigou schiefer is probably allochthonic thrust sheet, and ages from magma zircons and those thermal genetics bound its general locating time to the interval from 220.0Ma to 167.1Ma.
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Key words:
- Dashuigou schiefer /
- protolith /
- geochronology /
- magmation /
- thermal zircons /
- petrology
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图 1 大水沟区域构造略图(据喻安光等改编,1998)
1.T-P1.三叠系-二叠系下统;2.S1-S2-3.志留系通化群;3.γ52侏罗纪二长花岗岩;4.γ22早震旦世中粒二长花岗岩;5.Ar-Pt康定杂岩;F1.滨东滑脱韧性剪切带;F2.西油坊逆冲推覆韧性剪切带;F3.拉谷盆子滑脱韧性剪切带;F4.野鸡洞逆冲推覆韧性剪切带;Ⅰ.洪坝构造岩片;Ⅱ.大水沟构造岩片;Ⅲ.蟹螺构造岩片;Ⅳ.岩勒构造岩片;Ⅴ.挖角坝构造岩片
Fig. 1. Tectonic and geologic map of the Dashuigou region
图 3 岩石类型La/Tb-∑REE判别图解(据Allegre, 1978)
Fig. 3. La/Yb-∑REE discriminant diagram of rock types
图 4 区分正副变质岩的Zr/TiO2-Ni和Rfm-Rfl-Rv图解(a.据Wenchester et al., 1980; b.据王仁民等,1987)
Fig. 4. Zr/TiO2-Ni diagram and Rfm-Rfl-Rv diagram for differing orthorock from pararock
表 1 大水沟绿片岩主量(%)和微量元素(μg/g)分析结果
Table 1. Major (%) and trace elements (μg/g) analyses of green schist, Dashuigou
样号名称 H1片岩 H2片岩 H3片岩 H4片岩 H5片岩 SiO2 45.45 44.02 39.20 39.64 37.89 TiO2 1.70 1.70 1.35 1.48 1.85 Al2O3 14.46 17.49 16.88 16.16 18.06 Fe2O3 3.80 4.67 3.16 3.26 2.86 FeO 10.84 8.17 9.75 9.01 11.98 MnO 0.26 0.22 0.20 0.20 0.21 MgO 7.26 7.97 8.14 7.73 9.37 CaO 7.57 10.15 9.64 10.69 7.49 Na2O 1.77 2.47 1.67 1.66 1.68 K2O 0.80 0.31 2.38 2.39 2.35 P2O5 0.30 0.37 0.16 0.32 0.26 H2O+ 1.91 1.91 1.85 1.58 2.67 H2O- 0.06 0.06 0.13 0.11 0.19 S 0.15 0.15 0.18 0.20 0.10 CO2 3.14 0.65 4.04 4.87 1.57 Total 99.47 100.31 98.74 99.30 98.53 Cs 4.37 4.01 4.07 4.34 4.00 Rb 41.90 14.34 29.30 252.09 118.43 Sr 215.00 201.05 128.00 199.00 219.60 Ba 269.00 250.44 289.00 315.39 348.92 Ga 28.34 19.45 21.97 20.88 25.56 Nb 18.30 16.20 6.21 17.14 17.92 Ta 1.66 1.20 1.22 1.36 1.36 Zr 134.00 94.00 78.90 113.00 101.00 Hf 3.36 13.00 3.45 2.70 4.40 Th 6.05 1.85 4.41 1.48 1.69 V 325.50 285.10 306.27 254.90 378.80 Cr 175.80 162.80 188.50 229.00 173.70 Co 58.90 54.94 47.70 26.26 61.89 Ni 90.30 89.17 103.73 123.20 98.82 B 4.10 3.50 3.67 4.20 3.30 Li 24.40 22.86 22.20 41.56 41.36 Sc 41.57 37.45 39.65 38.19 43.31 U 1.55 1.45 0.69 0.52 0.58 Cu 21.45 19.46 44.02 61.42 51.18 Zn 272.44 177.15 156.27 145.55 146.10 Pb 28.90 36.18 27.03 24.81 20.08 La 15.50 19.46 11.20 18.47 21.18 Ce 36.30 34.78 26.60 30.59 36.90 Pr 4.79 4.76 3.28 4.28 4.96 Nd 20.20 20.71 12.90 17.91 21.21 Sm 4.51 5.51 3.23 4.68 5.29 Eu 1.51 1.55 1.40 1.90 1.95 Gd 3.70 4.55 2.58 3.96 4.27 Tb 0.77 1.10 0.50 0.99 0.96 Dy 4.95 6.68 2.93 6.32 5.68 Ho 0.90 1.42 0.55 1.31 1.17 Er 2.58 3.71 1.60 3.38 3.12 Tm 0.40 0.58 0.25 0.54 0.48 Yb 2.35 3.17 1.43 2.91 2.52 Lu 0.35 0.41 0.24 0.40 0.34 Y 23.50 39.78 14.30 38.63 33.86 REE 122.31 148.14 82.99 136.27 143.89 LREE 82.81 86.76 58.61 77.84 91.48 HREE 16.00 21.60 10.08 19.81 18.54 LR/HR 5.18 4.02 5.81 3.93 4.93 表 2 大水沟岩片绿片岩锆石SHRIMP U-Pb年龄分析结果
Table 2. Analytical data of SHRIMP U-Pb isotope of zircon grains from greenshcist, in Dashuigou schiefer
样点编号 U(10-6) Th(10-6) 232Th/238U 206Pbc(%) 206Pb*(10-6) 206Pb/238U(Ma) 1δerr 208Pb/232Th(Ma) 1δerr 207Pb/206Pb(Ma) 1δ err 207Pb*/206Pb* err (%) 207Pb*/235U err (%) 206Pb*/238U err (%) err corr G3784-2#-27.1 56 53 0.97 3.23 6.5 790.5 13.0 599 43 34 261 0.0467 10.9 0.84 11.0 0.1305 1.7 0.158 G3784-2#-12 56 78 1.43 2.10 6.3 780.0 8.2 694 26 309 173 0.0525 7.6 0.93 7.7 0.1286 1.1 0.146 G3784-2#-1-2.1 82 148 1.87 1.45 8.9 762.5 6.6 677 23 548 105 0.0585 4.8 1.01 4.9 0.1256 0.9 0.187 G3784-2#-18.1 44 61 1.43 2.54 4.4 696.4 9.2 569 27 299 227 0.0523 10.0 0.82 10.1 0.1141 1.4 0.138 G3784-2#-1-1.1 106 118 1.15 1.08 10.4 689.4 6.0 607 14 444 86 0.0558 3.9 0.87 4.0 0.1129 0.9 0.229 G3784-2#-6.1 136 96 0.73 1.10 13.4 688.7 4.9 567 28 504 77 0.0573 3.5 0.89 3.6 0.1127 0.8 0.210 G3784-2#-10 301 160 0.55 0.46 29.0 682.4 3.8 608 12 603 37 0.0600 1.7 0.92 1.8 0.1117 0.6 0.330 G3784-2#-9 266 149 0.58 0.41 25.1 669.0 4.3 619 16 538 51 0.0582 2.3 0.88 2.4 0.1094 0.7 0.281 G3784-2#-31.2 304 191 0.65 0.14 27.9 653.3 3.7 617 9 649 30 0.0613 1.4 0.90 1.5 0.1066 0.6 0.391 G3784-2#-32.2 248 130 0.54 0.32 22.8 651.8 4.1 598 12 604 38 0.0600 1.7 0.88 1.9 0.1064 0.7 0.356 G3784-2#-14.1 435 201 0.48 0.30 39.6 647.1 3.3 595 14 581 26 0.0594 1.2 0.86 1.3 0.1056 0.5 0.414 G3784-2#-8.1 199 247 1.28 0.72 18.1 642.9 4.0 600 10 646 47 0.0612 2.2 0.88 2.3 0.1049 0.7 0.287 G3784-2#-33.2 176 84 0.49 0.74 9.6 392.4 6.7 574 21 586 99 0.0595 4.6 0.51 4.9 0.0628 1.8 0.360 G3784-2#-23.1 285 84 0.31 0.87 13.9 353.1 14.2 346 22 336 70 0.0532 3.1 0.41 5.2 0.0563 4.1 0.800 G3784-2#-5.1 148 205 1.42 3.30 5.5 262.0 2.7 223 10 -841 510 0.0334 17.8 0.19 17.8 0.0415 1.1 0.059 G3784-2#-7.1 72 116 1.66 3.89 2.6 260.9 4.5 222 13 64 157 0.0313 25.3 0.18 25.4 0.0413 1.8 0.070 G3784-2#-22.1 176 291 1.71 1.26 6.3 260.9 2.1 240 6 -1036 757 0.0473 6.6 0.27 6.7 0.0413 0.8 0.125 G3784-2#-11 100 191 1.96 3.50 3.6 256.5 3.5 195 22 -522 603 0.0375 22.5 0.21 22.6 0.0406 1.4 0.061 G3784-2#-25.1 227 441 2.00 1.77 8.0 255.3 2.0 234 5 -231 192 0.0419 7.6 0.23 7.7 0.0404 0.8 0.104 G3784-2#-20.1 104 199 1.98 3.68 3.7 255.2 4.0 222 14 -1048 683 0.0311 22.8 0.17 22.8 0.0404 1.6 0.070 G3784-2#-21.1 166 529 3.30 1.92 5.8 252.6 2.4 228 6 -128 217 0.0437 8.8 0.24 8.9 0.0400 1.0 0.110 G3784-2#-16.1 46 74 1.67 2.30 1.6 249.6 7.1 222 13 -301 551 0.0408 21.6 0.22 21.8 0.0395 2.9 0.134 G3784-2#-17.1 210 428 2.11 1.00 7.1 247.9 1.8 226 4 152 103 0.0491 4.4 0.27 4.5 0.0392 0.8 0.169 G3784-2#-13.1 228 664 3.01 1.67 7.8 247.8 2.1 221 3 -116 170 0.0439 6.9 0.24 6.9 0.0392 0.9 0.125 G3784-2#-3.1 204 598 3.03 1.71 6.9 245.0 2.0 210 3 -204 207 0.0424 8.2 0.23 8.3 0.0387 0.8 0.099 G3784-2#-15.1 954 1691 1.83 0.34 31.2 240.2 1.2 211 5 114 57 0.0483 2.4 0.25 2.5 0.0380 0.5 0.203 G3784-2#-24.1 533 1471 2.85 0.91 16.9 232.3 1.3 228 4 -87 94 0.0444 3.8 0.22 3.9 0.0367 0.6 0.150 G3784-2#-26.1 1556 3617 2.40 0.25 48.6 229.6 1.0 203 2 193 25 0.0500 1.1 0.25 1.2 0.0363 0.5 0.389 G3784-2#-28.1 1822 4576 2.60 0.17 56.6 228.4 1.0 202 2 238 21 0.0509 0.9 0.25 1.0 0.0361 0.4 0.449 G3784-2#-19.1 909 2596 2.95 0.58 28.2 227.1 1.1 196 3 89 49 0.0478 2.1 0.24 2.1 0.0359 0.5 0.238 G3784-2#-37.1 799 1423 1.84 0.32 23.9 220.0 1.7 198 2 174 42 0.0496 1.8 0.24 1.9 0.0347 0.8 0.403 G3784-2#-35.1 3411 1022 0.31 0.45 100.5 216.5 0.9 216 4 273 22 0.0517 1.0 0.24 1.1 0.0342 0.4 0.409 G3784-2#-30.1 5209 293 0.06 0.54 130.9 184.9 1.2 230 20 215 25 0.0504 1.1 0.20 1.3 0.0291 0.7 0.518 G3784-2#-31.1 4596 241 0.05 0.22 112.4 180.5 1.6 221 9 164 18 0.0493 0.8 0.19 1.2 0.0284 0.9 0.762 G3784-2#-29.1 4479 52 0.01 0.14 105.5 174.1 1.8 115 30 133 17 0.0487 0.7 0.18 1.3 0.0274 1.0 0.825 G3784-2#-32.1 3838 134 0.04 0.14 89.3 172.0 0.8 172 10 157 17 0.0492 0.7 0.18 0.9 0.0270 0.5 0.564 G3784-2#-33.1 4455 182 0.04 0.16 103.6 172.0 1.1 172 11 173 18 0.0495 0.8 0.18 1.0 0.0270 0.7 0.651 G3784-2#-34.1 4952 183 0.04 0.19 114.9 171.5 0.7 180 13 115 20 0.0483 0.8 0.18 0.9 0.0270 0.4 0.457 G3784-2#-36.1 5356 211 0.04 0.17 121.1 167.1 1.8 150 10 150 17 0.0490 0.7 0.18 1.3 0.0263 1.1 0.832 G3784-1#-1.1 145 317 2.26 1.15 10.9 533.0 4.0 477 10 259 111 0.0514 4.9 0.61 4.9 0.0862 0.8 0.158 G3784-1#-2.1 37 40 1.11 9.08 0.7 127.0 5.2 88 24 0.0199 4.1 G3784-1#-3.1 200 107 0.56 0.28 58.7 1892.7 9.9 1649 23 2430 9 0.1576 0.5 7.42 0.8 0.3412 0.6 0.761 G3784-1#-4.1 193 103 0.55 1.44 7.5 282.6 2.4 233 16 -17 181 0.0457 7.5 0.28 7.5 0.0448 0.9 0.116 G3784-1#-5.1 193 101 0.54 0.25 61.7 2030.7 11.0 2217 31 2400 9 0.1548 0.5 7.90 0.8 0.3703 0.6 0.765 G3784-1#-6.1 522 456 0.90 3.61 19.1 259.5 1.7 169 10 -38 180 0.0453 7.4 0.26 7.5 0.0411 0.7 0.092 G3784-1#-7.1 509 451 0.92 0.39 118.6 1542.5 6.8 1436 15 2358 9 0.1511 0.5 5.63 0.7 0.2703 0.5 0.695 G3784-1#-8.1 141 73 0.53 0.63 45.6 2049.7 15.7 1790 57 2467 16 0.1611 0.9 8.32 1.3 0.3743 0.9 0.686 注:(1)1#为上部细粒斜长角闪片岩中的N1锆石,2#为下部阳起石斜长角闪片岩中的N2锆石;(2)206Pbc表示普通206Pb占总206Pb的百分比,206Pb*表示放射性206Pb的含量. -
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