LA-ICP-MS zircon U-Pb age of the volcanic rocks in Chubb area, Xietongmen County, Tibet, and its geological implications
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摘要:
西藏地勘局地质二队在谢通门县查布地区1:5万区域地质调查中新解体出一套火山岩地层,其岩性以安山岩、流纹岩、火山角砾岩及凝灰岩为主,岩层总厚度在研究区由东向西减小。用LA-ICP-MS技术对流纹岩、安山岩2件样品中的锆石进行U-Pb同位素测定,其206Pb/238U年龄加权平均值分别为:流纹岩中有2组年龄15.12±0.29Ma(MSWD=1.8,n=8)、45.39±0.56Ma(MSWD=0.93,n=14),安山岩中有4组年龄15.29±0.16Ma(MSWD=1.4,n=59)、51.9±2.3Ma(MSWD=3.5,n=7)、45.2±1.4Ma(MSWD=3.8,n=10)、38.5±0.93Ma(MSWD=1.08,n=5)。据此将该套火山岩喷发时限确定为15Ma左右,划归于布嘎寺组。
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关键词:
- 中新世 /
- 火山岩 /
- 冈底斯带 /
- LA-ICP-MS锆石U-Pb年龄
Abstract:The No.2 Geobrigade of Tibet Geological Prospecting Bureau has disintegrated a set of volcanic rocks in the 1:50 thousand regional geological survey of the chubb area of Xietongmen county. It composed dominantly of andesite, rhyolite, volcanic breccia and tuff. The total thickness of the rock strata decreases from east to west in the study area. The U-Pb isotopes of zircons from rhyolite and andesite samples were determined by LA-ICP-MS. The weighted average ages of 206Pb/238U were 15.12±0.29Ma (MSWD=1.8, n=8), 45.39 ±0.56Ma (MSWD=0.93, n=14) in rhyolite and 15.29 ±0.16Ma (MSWD=1.4, n=59), 51.9 ±2.3Ma (MSWD=3.5, n=7), 45.2±1.4Ma (MSWD=3.8, n=10), 38.5±0.93Ma (MSWD=1.08, n=5) in andesite. Based on this, the eruption time limit of this suite of volcanic rocks is determined to be 15Ma or so, and it belongs to the Bugasi Group.
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Key words:
- Miocene /
- volcanic rocks /
- Gangdese belt /
- LA-ICP-MS zircon U-Pb age
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图 1 冈底斯带中段构造单元及多岛弧划分简图[14]
Figure 1.
表 1 西藏查布地区布嘎寺组火山岩LA-ICP-MS锆石U-Th-Pb分析结果
Table 1. LA-ICP-MS zircon U-Th-Pb analytical data of the Bugasi Formation volcanic rocks in Chubb area, Tibet
测点 含量/10-6 Th/U 同位素比值 年龄/Ma Pb Th U 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 流纹岩(D5445) 1 40.1 1368.9 1404.5 0.9 0.007 0.0001 0.0455 0.0021 0.0473 0.0022 44.98 0.87 45.17 2.06 65 68 2 12.6 921 3252.2 0.2 0.0024 0.0001 0.0152 0.0009 0.0466 0.0027 15.23 0.35 15.32 0.88 28 83 3 43.3 1774.9 972.6 1.8 0.007 0.0002 0.0429 0.0029 0.0464 0.0033 45 1.2 42.68 2.86 19 99 5 10.5 1196.5 1421.7 0.8 0.0024 0.0001 0.0154 0.0016 0.0469 0.0046 15.21 0.45 15.52 1.57 45 170 6 6.6 629 1112.9 0.5 0.0021 0.0001 0.0138 0.0012 0.0474 0.0046 13.69 0.49 13.88 1.25 69 134 7 19.5 1258.1 1267.8 0.9 0.0073 0.0002 0.0468 0.0035 0.0466 0.0034 46.56 1.45 46.44 3.37 30 104 9 18.9 659.7 810.2 0.8 0.007 0.0002 0.0442 0.0024 0.046 0.0027 45.06 1.06 43.92 2.35 10 8.6 604.6 1811.8 0.3 0.0024 0.0001 0.0153 0.0008 0.0462 0.0023 15.43 0.31 15.42 0.8 8 74 11 29.4 1039.9 881.3 1.1 0.0069 0.0002 0.0466 0.0028 0.0492 0.0028 44.01 1.09 46.21 2.68 158 91 13 23.6 686 1974.9 0.3 0.007 0.0002 0.0453 0.0019 0.0472 0.0021 45.14 1.06 44.99 1.83 59 52 14 35.4 1265.4 1215.6 1 0.0071 0.0002 0.0456 0.0023 0.0465 0.002 45.51 1.15 45.3 2.24 22 63 15 26.9 997.8 800.8 1.2 0.0067 0.0003 0.0446 0.0028 0.0487 0.0032 43.2 1.58 44.28 2.74 132 80 16 41.5 3686.5 6106 0.6 0.0024 0.0001 0.015 0.0011 0.045 0.0033 15.63 0.67 15.11 1.11 17 41.7 1524.9 1213.2 1.2 0.0071 0.0002 0.0459 0.0024 0.0472 0.0023 45.28 1.06 45.6 2.3 61 71 18 12.5 986.1 2686.2 0.3 0.0023 0.0001 0.0144 0.0009 0.0466 0.0028 14.57 0.37 14.56 0.89 28 86 19 17.8 1697 2621.8 0.6 0.0024 0.0001 0.0188 0.0012 0.059 0.0061 15.54 0.88 18.93 1.22 565 63 20 26.1 786.8 1665.1 0.4 0.0073 0.0002 0.0469 0.0025 0.0471 0.0027 46.79 1.14 46.54 2.45 56 74 21 20.9 746.1 675.8 1.1 0.0068 0.0003 0.0451 0.0054 0.0494 0.0062 43.42 1.72 44.81 5.22 168 193 22 12.6 896.1 2412.8 0.3 0.0024 0.0001 0.0155 0.0011 0.0459 0.003 15.61 0.41 15.57 1.12 23 42.5 1442.3 1742.1 0.8 0.0072 0.0002 0.047 0.0025 0.0478 0.0025 46.04 0.98 46.64 2.39 91 78 24 39.1 1374.1 1112 1.2 0.0071 0.0002 0.0455 0.0023 0.0469 0.0024 45.76 1.04 45.2 2.23 43 69 25 16.3 490.6 1052.3 0.4 0.0071 0.0002 0.0468 0.003 0.0481 0.0031 45.38 1.12 46.42 2.86 104 96 安山岩(D4206) 1 3.9 125.2 156 0.8 0.0079 0.0003 0.0505 0.0042 0.0493 0.004 50.71 1.74 50.06 4.1 164 126 2 13.6 1761.4 1428.9 1.2 0.0023 0.0001 0.0153 0.0009 0.0485 0.003 15.08 0.36 15.46 0.89 122 88 3 21.6 902.9 1036.3 0.9 0.0071 0.0002 0.0458 0.0019 0.0474 0.002 45.32 1 45.48 1.88 67 56 5 5.6 623 745.3 0.8 0.0024 0.0001 0.0156 0.002 0.0483 0.0062 15.28 0.64 15.71 2.03 114 210 6 11.9 1389.9 2281.5 0.6 0.0024 0.0001 0.0158 0.0016 0.047 0.005 15.68 0.41 15.9 1.59 48 174 7 5.7 190.8 372.3 0.5 0.0077 0.0002 0.0501 0.003 0.0477 0.003 49.44 1 49.68 2.87 82 94 8 9.9 282.2 475.3 0.6 0.0086 0.0002 0.0672 0.0046 0.0568 0.0039 55.37 1.27 66.04 4.35 485 109 9 6.9 572.6 1563.9 0.4 0.0024 0.0001 0.015 0.0017 0.0457 0.0051 15.68 0.85 15.06 1.71 10 3.2 115.8 215.4 0.5 0.0058 0.0002 0.0371 0.005 0.0451 0.0056 37.43 1.52 37.02 4.91 12 5.4 336 397 0.8 0.0025 0.0002 0.0167 0.0038 0.0511 0.0141 16.18 1.11 16.85 3.79 245 340 13 10.4 369.6 513.4 0.7 0.0072 0.0002 0.048 0.0027 0.0485 0.0025 46.34 1.13 47.64 2.6 122 82 14 6 774.9 723.2 1.1 0.0025 0.0001 0.0157 0.0014 0.048 0.0045 15.76 0.51 15.86 1.39 97 136 15 14.9 1803.4 1357.1 1.3 0.0024 0.0001 0.0154 0.0008 0.0474 0.0023 15.38 0.34 15.56 0.77 71 70 16 7.7 236.9 332.3 0.7 0.008 0.0002 0.0505 0.0027 0.0461 0.0027 51.84 1.43 62.99 3.59 17 6.2 589.3 1074.8 0.5 0.0024 0.0002 0.0159 0.0028 0.0475 0.0072 15.46 1.14 16.02 2.82 72 239 18 7.2 821.7 1637 0.5 0.0025 0.0002 0.016 0.0008 0.0494 0.0023 16.08 1.04 16.13 0.83 166 69 19 8.3 703.3 1140.5 0.6 0.0025 0.0001 0.0164 0.0015 0.0478 0.0043 16.28 0.46 16.51 1.46 90 145 20 15.5 679.8 797.2 0.9 0.0063 0.0002 0.0478 0.0022 0.0568 0.0028 40.17 1.09 47.38 2.11 482 55 21 12.7 499.8 586.9 0.9 0.0068 0.0002 0.0488 0.0029 0.0523 0.0028 43.56 1.26 48.4 2.81 298 83 22 5.7 830.1 886.1 0.9 0.0024 0.0001 0.0151 0.0017 0.0458 0.0045 15.18 0.5 15.18 1.67 23 10.8 1128.2 1200.8 0.9 0.0025 0.0001 0.0165 0.0015 0.0495 0.0049 16.05 0.52 16.57 1.47 169 142 24 8.4 311.1 504.2 0.6 0.0069 0.0002 0.0495 0.0031 0.0529 0.0031 44.01 1.42 49.02 3.02 324 86 25 3.3 254.4 323.8 0.8 0.0027 0.0001 0.0168 0.0027 0.0461 0.0078 17.67 1 27.89 3.31 26 4.6 124 158.9 0.8 0.0083 0.0002 0.0525 0.0125 0.0461 0.011 54.82 1.66 81.41 7.4 27 2.2 37.8 172.2 0.2 0.0083 0.0003 0.0646 0.0053 0.0607 0.0057 53.16 1.74 63.59 5.1 627 122 28 6.7 719.8 808.7 0.9 0.0026 0.0001 0.0167 0.0021 0.0475 0.0058 16.81 0.79 16.85 2.06 72 187 30 9.3 843.7 2384.7 0.4 0.0024 0.0001 0.0155 0.0012 0.0477 0.0035 15.28 0.46 15.59 1.16 83 110 31 6.3 789.6 653.9 1.2 0.0026 0.0001 0.0211 0.0022 0.0616 0.0057 16.67 0.59 21.24 2.2 660 164 32 6.7 764.2 1051 0.7 0.0024 0.0001 0.0155 0.0019 0.0483 0.0065 15.28 0.76 15.59 1.85 116 174 33 6.1 653.8 688.6 0.9 0.0022 0.0001 0.0141 0.0016 0.0493 0.0057 14.28 0.53 14.21 1.58 161 182 34 10.5 342.5 434.9 0.8 0.0072 0.0003 0.0474 0.0027 0.0482 0.0026 46.5 1.62 46.98 2.64 111 71 35 4 145.8 512.4 0.3 0.0058 0.0002 0.0379 0.0024 0.0484 0.003 37.54 1.27 37.81 2.37 117 85 36 14 504.6 679.6 0.7 0.0075 0.0002 0.0477 0.0024 0.0471 0.0022 47.91 1.48 47.34 2.33 55 58 37 6.8 677.5 1735.7 0.4 0.0026 0.0002 0.0164 0.002 0.0479 0.0059 16.69 1.37 16.53 1.98 94 132 38 23.9 2195.1 4658.4 0.5 0.0026 0.0001 0.0168 0.0008 0.0481 0.0023 16.62 0.62 16.86 0.83 102 55 40 3.8 294.1 491.7 0.6 0.0023 0.0001 0.0148 0.0017 0.0503 0.0069 14.64 0.63 14.9 1.67 209 175 41 4.4 418.5 493.5 0.8 0.0022 0.0001 0.0139 0.0022 0.0461 0.0074 14.84 0.63 28.05 2.94 42 9.9 1263.3 1035.8 1.2 0.0023 0.0001 0.0143 0.0017 0.0448 0.0052 14.91 0.86 14.4 1.74 43 6.2 820.3 832.3 1 1 0.0024 0.0003 0.0153 0.0034 0.0505 0.0154 15.17 2.21 15.38 3.39 217 249 44 8.4 1004.6 981.3 0.7 0.0023 0.0001 0.0154 0.0027 0.0485 0.008 14.79 0.86 15.53 2.65 125 253 47 13.1 1471.7 2019.4 0.7 0.0024 0.0001 0.0157 0.0008 0.049 0.0027 15.26 0.39 15.83 0.77 150 67 49 5.9 389 531.8 0.5 0.0023 0.0001 0.0147 0.0006 0.0461 0.0022 15.76 0.46 29.53 2.05 50 3.4 343.5 671.1 0.3 0.0022 0.0001 0.0154 0.0024 0.0547 0.0094 14.13 0.9 15.56 2.4 400 234 51 10 118.5 361.6 1 1 0.0074 0.0002 0.047 0.0081 0.0461 0.008 52.33 1.33 126.96 7.54 52 8.9 662.1 677.1 0.6 0.0024 0.0001 0.0198 0.0066 0.0603 0.0202 17.13 0.71 50.93 3.98 613 655 53 4.4 526.2 524.2 0.8 0.0022 0.0001 0.0141 0.0014 0.045 0.0041 14.45 0.53 14.21 1.44 54 15.4 1460.2 2383.9 0.1 0.0024 0.0001 0.0152 0.0007 0.0463 0.0022 15.5 0.38 15.36 0.69 13 53 55 6.3 636.9 783.3 0.7 0.0023 0.0001 0.0154 0.0013 0.0487 0.0045 15.01 0.53 15.55 1.31 132 125 56 4.5 143.6 1236.7 0.2 0.0026 0.0001 0.0165 0.0016 0.0464 0.0039 16.5 0.53 16.61 1.55 18 147 57 8.2 478.9 709.6 0.7 0.0024 0.0001 0.0211 0.0053 0.0634 0.0162 16.99 0.56 46.48 3.61 721 532 58 5.2 163.3 726.1 0.7 0.006 0.0002 0.04 0.0022 0.0486 0.0023 38.53 1.12 39.8 2.19 130 76 59 16.9 629.5 899.1 0.6 0.0059 0.0001 0.0409 0.0058 0.0506 0.0073 38.34 0.9 52.75 3.16 223 298 60 4.6 380.6 575.1 1.5 0.0022 0.0001 0.0167 0.0036 0.0557 0.0123 14.72 0.45 29.63 1.95 442 431 61 27.4 1354.3 2105 0.5 0.0024 0.0001 0.0185 0.0048 0.0555 0.0146 17.39 0.4 50.21 4.2 433 499 62 33.4 1482.9 971.6 0.8 0.0066 0.0001 0.0481 0.002 0.0529 0.0022 42.63 0.8 47.74 1.94 324 60 63 21.3 2222.2 4107.1 0.9 0.0024 0.0001 0.0155 0.0006 0.0463 0.0016 15.63 0.31 15.59 0.57 11 42 64 27.7 1162.1 1454.4 0.7 0.0072 0.0002 0.0493 0.0016 0.0494 0.0014 46.45 0.94 48.82 1.54 166 40 65 4.3 514.7 570.9 0.8 0.0024 0.0001 0.0158 0.0013 0.0496 0.0042 15.35 0.47 15.94 1.25 178 123 66 2 241.5 357.2 0.8 0.0024 0.0001 0.0151 0.0014 0.0485 0.0043 15.24 0.57 15.19 1.41 124 139 67 5.5 500.6 624.7 0.8 0.0026 0.0001 0.0151 0.0023 0.0421 0.0053 16.43 0.8 15.24 2.34 68 5.2 595.7 771.6 0.8 0.0023 0.0001 0.0149 0.002 0.0462 0.006 14.82 0.46 14.99 2.03 10 220 69 2.8 376.2 460.4 0.9 0.0024 0.0001 0.0151 0.0014 0.049 0.005 15.2 0.58 15.19 1.43 148 143 70 25.5 2841 3775.5 0.7 0.0023 0 0.0149 0.0006 0.0463 0.0016 14.96 0.28 15.03 0.6 14 51 71 9.3 1063.9 1127.5 0.9 0.0024 0.0001 0.0155 0.0012 0.0479 0.0038 15.37 0.39 15.61 1.18 96 121 72 5.8 558.1 832.3 0.9 0.0023 0.0001 0.0153 0.0019 0.0502 0.0075 15.03 0.63 15.45 1.94 206 207 74 4.7 632 705.2 0.9 0.0023 0.0001 0.0147 0.0016 0.0495 0.0061 14.54 0.69 14.85 1.61 172 159 75 2.5 380.4 407.7 1 0.0022 0.0001 0.0147 0.0025 0.0489 0.0094 14.43 0.7 14.85 2.49 140 263 76 6.8 853.5 926 1.3 0.0023 0.0001 0.0142 0.0011 0.047 0.004 14.53 0.43 14.29 1.14 51 121 77 7.8 947.7 941.2 0.8 0.0024 0.0001 0.0158 0.0015 0.0481 0.0043 15.29 0.54 15.9 1.49 102 144 78 15.9 702.4 558 0.8 0.0068 0.0002 0.0423 0.0018 0.0455 0.0021 43.84 0.97 42.03 1.76 79 4.6 579.7 739.4 0.9 0.0024 0.0001 0.0154 0.0014 0.0484 0.0045 15.3 0.58 15.49 1.37 121 130 80 6.3 800.6 975 0.5 0.0021 0.0001 0.0201 0.0015 0.0673 0.004 13.76 0.49 20.2 1.46 847 94 81 3.6 367.1 424 0.8 0.0025 0.0001 0.0183 0.0022 0.0578 0.0098 16.33 0.78 18.38 2.2 522 182 83 8.4 727.2 1453 1 0.0024 0.0001 0.0165 0.0011 0.0503 0.0035 15.48 0.44 16.61 1.1 209 102 84 3.1 408.3 501.2 0.4 0.0023 0.0001 0.0151 0.0022 0.0502 0.0079 14.92 0.81 15.2 2.2 205 227 85 3.7 500.3 509.8 0.5 0.0023 0.0001 0.0151 0.0019 0.0484 0.0061 15.05 0.78 15.24 1.86 119 180 86 8.8 802.6 1806.6 1.1 0.0023 0.0001 0.0145 0.0008 0.0464 0.0026 14.77 0.39 14.66 0.82 18 74 87 9.7 269.1 503.6 0.7 0.0084 0.0002 0.0553 0.0028 0.0483 0.0023 53.86 1.52 54.65 2.67 114 66 88 4.3 414.2 383.3 0.7 0.0023 0.0001 0.0151 0.0013 0.0486 0.0046 14.92 0.52 15.25 1.3 126 127 89 2.4 274 401.4 0.002 0.0001 0.0153 0.0023 0.0592 0.0096 12.78 0.78 15.39 2.27 573 220 90 6.5 624.7 925 0.0024 0.0001 0.0153 0.0012 0.0466 0.0032 15.48 0.47 15.42 1.22 27 117 -
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