Depositional and Provenance Records of Upper Devonian to Lower Carboniferous Sandstones from Bachu Area, Northwestern Tarim Basin: Implications for Tectonic Evolution
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摘要: 泥盆纪-石炭纪是南天山洋-塔里木盆地北部陆缘构造演化的关键时期.选取塔里木盆地巴楚地区上泥盆统-下石炭统露头剖面，在沉积体系、碎屑组分、重矿物组合分析基础上，重点通过LA-ICP-MS分析砂岩样品.结果表明，上泥盆统-下石炭统砂岩碎屑颗粒以单晶石英为主，(变质) 结晶岩岩屑极少，物源构造属性主要指示陆块物源区；重矿物组合以锆石、电气石和TiO2矿物等稳定重矿物为主，反映相对远距离的源汇体系和稳定的构造背景；2个年代学样品具有类似的碎屑锆石U-Pb年龄组成和Hf同位素特征，主要反映了383~479 Ma、710~932 Ma、1 752~1 936 Ma、2 419~2 597 Ma共4期构造热事件，并以前两期为主.对比研究显示，上述碎屑物源以塔里木盆地内古隆起为主，同时还可能有来自阿尔金造山带、西昆仑造山带的再旋回沉积.但并没有记录到来自盆地北侧造山带和岛弧的物源信息，说明该时期南天山洋盆并没有闭合，塔里木盆地北缘西部可能不存在洋盆的向南俯冲，晚泥盆世-早石炭世其可能为被动大陆边缘.Abstract: Devonian-Carboniferous is the critical tectonic evolution period of the South Tianshan Ocean and the northern margin of Tarim Basin. Taking Upper Devonian to Lower Carboniferous outcrop of Bachu as the study area, this study further explores provenance, tectonic evolution and its geodynamic mechanism about the Tarim basin and the periphery orogen, based on depositional system, sandstone skeleton component, heavy minerals, especially detrial zircon geochronology analysis by LA-ICP-MS in situ U-Pb and Lu-Hf isotope.Sandstone skeleton component analysis shows that sandstone grains are dominated by mono crystalline quartz, and volcanic-metavolcanic fragments are rare.Its main provenance is the continental block provenance.The main proportions of heavy mineral assemblages are the stable heavy minerals, such as zircon, tourmaline, and TiO2 minerals. Heavy minerals analysis reflects the relatively distant source-sink systems and stable tectonic setting are possible. The geochronological samples show that the two samples have similar U-Pb age patterns and Hf isotopic compositions, mainly reflecting multiphase tectono-thermal events with age groups of 383-479 Ma, 710-932 Ma, 1 752-1 936 Ma, and 2 419-2 597 Ma respectively. Compared with the main potential source areas, the main provenance is the palaeohigh of Tarim basin. Meanwhile, the West Kunlunorogen and the Altunorogen may also have some contribution. However, there is no information about the northern orogenand island arcs. It shows the South Tianshan Ocean has not closed in this period, and there isn't subduction to the south in the northwestern margin of Tarim basin. In other words, the northwestern margin of Tarim basin is a passive continental margin during Late Devonian to Early Carboniferous.
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图 1 巴楚剖面地质简图及碎屑锆石样品点
Fig. 1. Geological sketch of Bachu area and the position of detrial zircon
图 2 下石炭统沉积剖面及样品位置
Fig. 2. The Upper Devonian to Lower Carboniferous depositional column and position of samples of the Bachu outcrop
图 3 巴楚剖面砂岩正交偏光镜下特征
BC1-13.上泥盆统东河塘组中细砂岩；BC1-22.上泥盆统甘木里克组中细砂岩；BC3-4.下石炭统巴楚组中细砂岩；BC3-9.下石炭统巴楚组中细砂岩.Qm.单晶石英；Qp.多晶石英；P.斜长石；Ls.(变质) 沉积岩岩屑
Fig. 3. Microscopic feature of sandstone of Bachu outcrop
图 4 巴楚剖面主要岩性、构造
a.东河塘组冲洗交错层理，东河砂岩沉积构造丰富，发育各种交错层理、水平层理、流水线理、剥离线理等；b.含砾砂岩段滨岸砾岩，砾石以石英质为主，分选磨圆均较好；c.巴楚组下泥岩段土黄色泥岩夹灰绿色粉砂岩，显示低能的潟湖环境；d.巴楚组生屑灰岩段，被压扁的波纹层理，显示台地的波浪作用较强；e.巴楚组中泥岩段小型交错层理；f.巴楚组标准灰岩段，灰岩层中夹河道砂岩，说明有短期的河流注入；g.巴楚组标准灰岩段上部灰岩层，砾屑灰岩极其发育，砾屑分选磨圆均很好，反映高能的沉积环境；h.标准灰岩段上部，灰岩与泥岩薄互层；i.卡拉沙依组，蒸发坪环境，发育厚层的膏岩层，可见粉砂岩夹层
Fig. 4. Lithologic and sedimentary structure photographs of the Bachu outcrop
图 5 巴楚剖面砂岩碎屑组分与物源类型三角图
Qm.单晶石英；Qp.多晶石英；K.钾长石；P.斜长石；Lv.(变质) 结晶岩岩屑；Ls.(变质) 沉积岩岩屑；Q.总石英颗粒；F.长石；L.不稳定复晶岩屑；Lt.岩屑总含量.改自Dickinson and Suczek (1979)
Fig. 5. Triangular plots showing sandstone fragment components and provenance of the Bachu outcrop
图 6 碎屑锆石样品U-Pb谐和图和年龄频谱
Fig. 6. Concordia plots, Histograms and relative probability plots of detrital zircon U-Pb ages
图 7 碎屑锆石Hf同位素特征
a.本文碎屑锆石εHf(t) 同位素组成；b.前人报道的εHf(t) 同位素数据汇总 (Long et al., 2010, 2011；Ge et al., 2012a, 2012b, 2013；Lei et al., 2012)
Fig. 7. Hf isotope data of detrital zircons from the two samples
图 9 典型碎屑锆石CL照片
图中圆圈代表原位测试点，直径为32 μm.红色数字为U-Pb年龄，单位为Ma；绿色数字为εHf(t) 值
Fig. 9. Typical CL images of detrital zircons
图 10 样品与潜在物源区构造热事件年龄对比
a~e引自前人文献 (Dong et al., 2014；郭春涛, 2014；李忠等, 2015)；g和f为本文样品
Fig. 10. Comparison of the ages between the samples and possible source areas
表 1 巴楚剖面砂岩重矿物统计 (%)
Table 1. Heavy minerals statistics of sandstone samples in the Bachu outcrop
样品 层位 锆石 白钛石 金红石 锐钛矿 电气石 磷灰石 赤褐铁矿 镜铁矿 BC1-13 东河塘组 50.6 5.0 0.8 26.3 13.5 3.7 BC1-22 甘木里克组 42.5 0.9 1.2 0.9 8.8 45.7 BC3-9 标准灰岩段 64.4 9.9 0.7 1.1 10.9 13.0 
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附表 1 巴楚地区碎屑锆石LA-ICP-MS U-Pb测年数据
附表 1. Zircon LA-ICP-MS U-Pb dating data from Bachu Area
样品点 232Th/238U 同位素比值 表面年龄 (Ma) 谐和度 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ BC1-13-001 0.20 0.055 99 0.002 71 0.558 19 0.025 09 0.072 30 0.001 61 452 61 450 16 450 10 100.0 BC1-13-002 0.56 0.055 22 0.007 41 0.531 46 0.066 56 0.069 80 0.003 82 421 183 433 44 435 23 99.5 BC1-13-003 0.66 0.068 67 0.002 20 1.312 77 0.038 50 0.138 64 0.002 58 889 32 851 17 837 15 101.7 BC1-13-004 0.41 0.163 47 0.002 18 10.631 47 0.133 99 0.471 63 0.006 51 2 492 10 2 491 12 2 491 29 100.0 BC1-13-005 0.62 0.162 09 0.003 85 10.479 18 0.235 91 0.468 84 0.009 89 2 478 17 2 478 21 2 478 43 100.0 BC1-13-006 0.97 0.055 73 0.002 57 0.539 21 0.023 17 0.070 16 0.001 47 442 59 438 15 437 9 100.2 BC1-13-007 0.85 0.056 21 0.003 00 0.551 49 0.027 34 0.071 15 0.001 72 461 68 446 18 443 10 100.7 BC1-13-008 0.33 0.066 14 0.002 98 1.212 95 0.050 37 0.132 99 0.003 10 811 49 807 23 805 18 100.2 BC1-13-009 1.18 0.054 77 0.011 60 0.472 17 0.095 67 0.062 52 0.004 24 403 324 393 66 391 26 100.5 BC1-13-010 0.38 0.226 88 0.002 22 18.755 42 0.178 35 0.599 49 0.007 33 3 030 9 3 029 9 3 028 30 100.1 BC1-13-011 0.17 0.182 15 0.003 76 12.890 18 0.254 47 0.513 18 0.010 08 2 673 15 2 672 19 2 670 43 100.1 BC1-13-012 0.33 0.064 67 0.002 67 1.113 70 0.042 27 0.124 89 0.002 71 764 45 760 20 759 16 100.1 BC1-13-013 0.42 0.123 30 0.002 76 6.197 62 0.129 29 0.364 52 0.006 54 2 005 17 2 004 18 2 004 31 100.0 BC1-13-014 0.77 0.069 36 0.003 87 1.405 87 0.072 40 0.147 00 0.004 18 909 61 891 31 884 23 100.8 BC1-13-015 0.46 0.057 36 0.003 14 0.606 66 0.030 61 0.076 70 0.001 97 505 67 481 19 476 12 101.1 BC1-13-016 0.38 0.056 37 0.003 21 0.573 66 0.030 70 0.073 80 0.001 73 467 77 460 20 459 10 100.2 BC1-13-017 0.93 0.064 80 0.004 32 1.131 05 0.070 89 0.126 58 0.003 67 768 84 768 34 768 21 100.0 BC1-13-018 0.43 0.054 81 0.008 26 0.492 69 0.071 40 0.065 20 0.002 71 404 335 407 49 407 16 100.0 BC1-13-019 0.41 0.071 40 0.004 87 1.334 44 0.083 47 0.135 54 0.004 74 969 72 861 36 819 27 105.1 BC1-13-020 0.69 0.070 79 0.002 64 0.750 98 0.025 46 0.076 93 0.001 52 951 38 569 15 478 9 119.0 BC1-13-021 0.39 0.066 98 0.001 30 1.283 81 0.022 90 0.138 99 0.001 84 837 18 839 10 839 10 100.0 BC1-13-022 0.55 0.067 30 0.001 42 1.306 18 0.025 37 0.140 76 0.001 94 847 20 848 11 849 11 99.9 BC1-13-023 0.16 0.066 49 0.002 31 1.251 22 0.039 86 0.136 48 0.002 69 822 35 824 18 825 15 99.9 BC1-13-024 0.69 0.056 33 0.003 81 0.576 55 0.036 78 0.074 23 0.002 01 465 93 462 24 462 12 100.0 BC1-13-025 0.68 0.111 98 0.003 73 5.065 62 0.155 88 0.328 06 0.007 93 1 832 26 1 830 26 1 829 38 100.2 BC1-13-026 0.48 0.064 96 0.003 35 1.141 84 0.054 22 0.127 48 0.003 33 773 57 773 26 773 19 100.0 BC1-13-027 0.36 0.078 05 0.003 41 0.859 58 0.035 22 0.079 88 0.001 21 1 148 89 630 19 495 7 127.3 BC1-13-028 0.68 0.151 33 0.006 52 8.896 90 0.329 16 0.426 39 0.009 44 2 361 75 2 327 34 2 289 43 103.1 BC1-13-029 0.29 0.056 00 0.004 92 0.568 34 0.047 31 0.073 59 0.002 40 452 127 457 31 458 14 99.8 BC1-13-030 1.20 0.065 89 0.016 63 1.178 25 0.283 64 0.129 67 0.011 97 803 364 790 132 786 68 100.5 BC1-13-031 0.55 0.069 19 0.006 15 1.392 37 0.114 73 0.145 93 0.006 31 904 100 886 49 878 35 100.9 BC1-13-032 0.47 0.153 55 0.003 15 9.480 71 0.183 56 0.447 77 0.008 27 2 386 15 2 386 18 2 385 37 100.0 BC1-13-033 0.79 0.057 38 0.004 37 0.651 35 0.046 30 0.082 32 0.002 67 506 100 509 28 510 16 99.8 BC1-13-034 0.67 0.095 34 0.006 36 3.524 30 0.217 65 0.268 08 0.010 83 1 535 60 1 533 49 1 531 55 100.3 BC1-13-035 0.62 0.065 67 0.002 65 1.137 02 0.042 36 0.125 55 0.002 66 796 44 771 20 762 15 101.2 BC1-13-036 0.60 0.067 41 0.003 35 1.310 03 0.060 20 0.140 93 0.003 57 850 55 850 26 850 20 100.0 BC1-13-037 0.77 0.066 44 0.002 87 1.240 77 0.049 47 0.135 42 0.003 05 820 47 819 22 819 17 100.0 BC1-13-038 0.88 0.067 19 0.006 13 1.300 26 0.111 37 0.140 34 0.005 68 844 112 846 49 847 32 99.9 BC1-13-039 0.44 0.056 25 0.003 13 0.572 45 0.029 79 0.073 80 0.001 78 462 73 460 19 459 11 100.2 BC1-13-040 1.30 0.055 86 0.002 75 0.516 67 0.023 75 0.067 08 0.001 44 447 64 423 16 419 9 101.0 BC1-13-041 0.57 0.123 13 0.005 54 4.833 85 0.197 79 0.284 70 0.008 97 2 002 34 1 791 34 1 615 45 124.0 BC1-13-042 0.52 0.070 23 0.003 65 1.472 00 0.070 13 0.152 01 0.004 24 935 54 919 29 912 24 100.8 BC1-13-043 0.95 0.067 83 0.002 38 1.339 92 0.043 58 0.143 26 0.002 69 863 37 863 19 863 15 100.0 BC1-13-044 0.56 0.065 77 0.002 24 1.199 83 0.037 70 0.132 30 0.002 44 799 36 801 17 801 14 100.0 BC1-13-045 0.63 0.067 21 0.003 13 1.292 05 0.056 24 0.139 42 0.003 16 844 54 842 25 841 18 100.1 BC1-13-046 0.52 0.141 96 0.005 26 8.168 73 0.284 26 0.417 30 0.012 19 2 251 27 2 250 31 2 248 55 100.1 BC1-13-047 0.33 0.068 20 0.002 76 1.317 31 0.049 00 0.140 08 0.003 08 875 42 853 21 845 17 100.9 BC1-13-048 1.10 0.066 62 0.004 10 1.227 86 0.071 15 0.133 65 0.003 66 826 76 813 32 809 21 100.5 BC1-13-049 1.10 0.083 53 0.008 32 1.599 18 0.148 44 0.138 83 0.006 36 1 282 111 970 58 838 36 115.8 BC1-13-050 1.61 0.174 07 0.006 23 11.872 76 0.405 52 0.494 63 0.015 40 2 597 25 2 594 32 2 591 66 100.2 BC1-13-051 0.76 0.055 26 0.005 38 0.517 00 0.047 53 0.067 85 0.002 48 423 140 423 32 423 15 100.0 BC1-13-052 0.15 0.057 29 0.002 28 0.600 97 0.022 07 0.076 07 0.001 49 503 47 478 14 473 9 101.1 BC1-13-053 0.45 0.068 90 0.001 84 1.407 02 0.034 41 0.148 10 0.002 41 896 26 892 15 890 14 100.2 BC1-13-054 0.34 0.125 91 0.008 87 6.321 29 0.384 49 0.364 11 0.012 93 2 042 128 2 021 53 2 002 61 102.0 BC1-13-055 1.43 0.067 95 0.003 88 1.351 39 0.071 62 0.144 23 0.004 09 867 64 868 31 869 23 99.9 BC1-13-056 1.39 0.063 40 0.004 36 1.043 54 0.067 17 0.119 37 0.003 62 722 86 726 33 727 21 99.9 BC1-13-057 1.20 0.087 46 0.006 48 1.148 74 0.077 13 0.095 24 0.003 56 1 371 73 777 36 586 21 132.6 BC1-13-058 0.23 0.145 99 0.003 46 8.596 92 0.191 04 0.427 04 0.008 67 2 299 17 2 296 20 2 292 39 100.3 BC1-13-059 0.19 0.070 32 0.001 83 1.507 39 0.035 96 0.155 46 0.002 50 938 25 933 15 931 14 100.2 BC1-13-060 0.62 0.069 14 0.001 73 1.430 80 0.032 90 0.150 08 0.002 35 903 24 902 14 901 13 100.1 BC1-13-061 0.22 0.087 35 0.001 30 2.843 70 0.039 06 0.236 09 0.002 93 1 368 12 1 367 10 1 366 15 100.1 BC1-13-062 0.78 0.066 87 0.002 24 1.273 12 0.039 21 0.138 07 0.002 60 834 34 834 18 834 15 100.0 BC1-13-063 0.74 0.065 17 0.005 52 1.151 15 0.090 39 0.128 09 0.005 12 780 99 778 43 777 29 100.1 BC1-13-064 0.42 0.119 21 0.003 78 5.795 42 0.170 51 0.352 54 0.008 37 1 944 24 1 946 25 1 947 40 99.8 BC1-13-065 0.75 0.054 77 0.005 32 0.491 62 0.045 32 0.065 10 0.002 30 403 144 406 31 407 14 99.8 BC1-13-066 0.40 0.066 48 0.004 55 1.264 00 0.080 07 0.137 89 0.004 60 822 78 830 36 833 26 99.6 BC1-13-067 0.36 0.116 12 0.002 50 5.459 70 0.108 57 0.340 97 0.005 87 1 897 16 1 894 17 1 891 28 100.3 BC1-13-068 0.60 0.065 94 0.003 29 1.202 21 0.055 71 0.132 22 0.003 26 804 57 802 26 801 19 100.1 BC1-13-069 1.00 0.112 09 0.010 28 5.080 21 0.440 42 0.328 67 0.017 54 1 834 84 1 833 74 1 832 85 100.1 BC1-13-070 0.26 0.070 07 0.003 65 1.463 34 0.070 95 0.151 45 0.003 93 930 58 915 29 909 22 100.7 BC1-13-071 0.65 0.060 19 0.002 53 0.790 31 0.030 54 0.095 22 0.002 03 610 48 591 17 586 12 100.9 BC1-13-072 0.34 0.129 41 0.005 73 6.730 16 0.277 75 0.377 14 0.012 47 2 090 33 2 077 36 2 063 58 101.3 BC1-13-073 1.32 0.065 49 0.009 19 1.179 51 0.158 86 0.130 61 0.006 40 790 203 791 74 791 36 100.0 BC1-13-074 0.25 0.069 20 0.002 31 1.401 53 0.042 93 0.146 88 0.002 82 905 33 890 18 883 16 100.8 BC1-13-075 0.65 0.115 50 0.005 24 5.408 86 0.228 19 0.339 62 0.010 65 1 888 36 1 886 36 1 885 51 100.2 BC1-13-076 0.32 0.067 01 0.001 38 1.284 20 0.024 40 0.138 97 0.001 89 838 19 839 11 839 11 100.0 BC1-13-077 0.39 0.189 77 0.002 99 13.863 65 0.209 62 0.529 78 0.008 44 2 740 12 2 740 14 2 741 36 100.0 BC1-13-078 0.46 0.067 63 0.004 39 1.309 56 0.078 07 0.140 43 0.004 71 857 70 850 34 847 27 100.4 BC1-13-079 1.14 0.120 49 0.007 37 5.916 56 0.339 11 0.356 10 0.014 52 1 963 50 1 964 50 1 964 69 99.9 BC1-13-080 0.49 0.056 36 0.003 82 0.581 94 0.036 80 0.074 88 0.002 18 467 89 466 24 465 13 100.2 BC1-13-081 0.21 0.067 19 0.002 14 1.286 60 0.037 86 0.138 87 0.002 46 844 33 840 17 838 14 100.2 BC1-13-082 0.65 0.161 12 0.003 86 10.375 77 0.235 73 0.467 01 0.009 94 2 467 17 2 469 21 2 470 44 99.9 BC1-13-083 0.77 0.120 26 0.005 72 5.900 21 0.260 43 0.355 78 0.011 79 1 960 37 1 961 38 1 962 56 99.9 BC1-13-084 2.00 0.080 02 0.002 49 2.228 80 0.063 60 0.202 00 0.003 91 1 197 28 1 190 20 1 186 21 100.9 BC1-13-085 0.39 0.109 57 0.004 38 4.845 46 0.180 79 0.320 69 0.008 52 1 792 33 1 793 31 1 793 42 99.9 BC1-13-086 0.39 0.079 53 0.007 49 2.214 16 0.193 97 0.201 89 0.009 79 1 185 99 1 186 61 1 185 53 100.0 BC1-13-087 0.22 0.154 31 0.002 84 7.184 30 0.120 54 0.337 64 0.005 49 2 394 13 2 135 15 1 875 26 127.7 BC1-13-088 0.83 0.070 32 0.004 83 1.497 09 0.094 70 0.154 38 0.005 43 938 74 929 39 925 30 100.4 BC1-13-089 0.47 0.077 01 0.007 41 1.368 36 0.120 09 0.128 85 0.006 32 1 121 99 875 51 781 36 112.0 BC1-13-090 0.53 0.055 75 0.006 53 0.546 63 0.059 80 0.071 11 0.003 41 442 159 443 39 443 21 100.0 BC1-13-091 0.51 0.119 22 0.002 70 5.785 16 0.121 54 0.351 90 0.006 26 1 945 17 1 944 18 1 944 30 100.1 BC1-13-092 0.95 0.065 67 0.008 92 1.187 84 0.152 90 0.131 16 0.007 09 796 181 795 71 794 40 100.1 BC1-13-093 1.12 0.073 33 0.003 71 0.649 50 0.029 62 0.064 23 0.001 65 1 023 52 508 18 401 10 126.7 BC1-13-094 0.37 0.065 53 0.002 70 1.182 83 0.045 07 0.130 91 0.002 81 791 45 793 21 793 16 100.0 BC1-13-095 1.12 0.065 81 0.011 77 1.201 90 0.200 29 0.132 44 0.010 66 800 219 801 92 802 61 99.9 BC1-13-096 0.36 0.055 23 0.014 16 0.502 72 0.123 21 0.066 01 0.005 54 422 364 414 83 412 34 100.5 BC1-13-097 0.59 0.064 19 0.004 29 1.082 01 0.068 17 0.122 23 0.003 48 748 85 745 33 743 20 100.3 BC1-13-098 0.51 0.080 09 0.010 59 1.816 71 0.220 93 0.164 49 0.011 14 1 199 137 1 051 80 982 62 107.0 BC1-13-099 0.62 0.110 33 0.005 02 4.917 97 0.208 31 0.323 25 0.009 81 1 805 37 1 805 36 1 806 48 99.9 BC1-13-100 0.43 0.067 57 0.004 18 1.315 33 0.075 00 0.141 16 0.004 44 855 68 852 33 851 25 100.1 BC1-13-101 0.34 0.069 28 0.002 49 1.400 06 0.046 26 0.146 55 0.002 93 907 37 889 20 882 16 100.8 BC1-13-102 0.46 0.057 39 0.002 63 0.646 88 0.027 80 0.081 74 0.001 63 507 60 507 17 507 10 100.0 BC1-13-103 0.75 0.058 98 0.007 57 0.512 37 0.064 03 0.063 00 0.001 87 566 291 420 43 394 11 106.6 BC1-13-104 0.60 0.068 58 0.003 60 1.359 83 0.065 66 0.143 79 0.003 97 886 56 872 28 866 22 100.7 BC1-13-105 0.52 0.055 94 0.002 65 0.567 46 0.024 96 0.073 56 0.001 60 450 60 456 16 458 10 99.6 BC1-13-106 0.49 0.067 04 0.003 47 1.282 96 0.061 33 0.138 77 0.003 66 839 57 838 27 838 21 100.0 BC1-13-107 0.30 0.066 40 0.003 04 1.222 71 0.051 74 0.133 55 0.003 12 819 50 811 24 808 18 100.4 BC1-13-108 0.53 0.163 37 0.005 86 10.212 91 0.299 85 0.453 40 0.009 34 2 491 62 2 454 27 2 410 41 103.4 BC1-13-109 0.90 0.064 23 0.005 26 0.433 01 0.034 41 0.048 89 0.000 95 749 179 365 24 308 6 118.5 BC1-13-110 0.65 0.057 76 0.004 55 0.554 35 0.040 59 0.069 60 0.002 33 521 102 448 27 434 14 103.2 BC1-13-111 0.49 0.066 90 0.002 95 1.250 87 0.050 62 0.135 59 0.003 21 835 46 824 23 820 18 100.5 BC1-13-112 1.04 0.083 60 0.004 13 2.526 87 0.115 40 0.219 19 0.006 23 1 283 47 1 280 33 1 278 33 100.4 BC1-13-113 0.34 0.100 67 0.001 95 4.005 29 0.071 25 0.288 53 0.004 32 1 636 15 1 635 14 1 634 22 100.1 BC1-13-114 0.50 0.054 82 0.004 36 0.483 24 0.036 49 0.063 93 0.001 87 405 117 400 25 399 11 100.3 BC1-13-115 0.41 0.056 31 0.002 64 0.558 00 0.024 09 0.071 86 0.001 60 465 57 450 16 447 10 100.7 BC1-13-116 0.20 0.064 96 0.002 49 1.141 31 0.040 52 0.127 41 0.002 53 773 42 773 19 773 14 100.0 BC1-13-117 0.60 0.056 64 0.005 47 0.602 91 0.054 97 0.077 19 0.002 86 478 137 479 35 479 17 100.0 BC1-13-118 0.75 0.065 27 0.007 89 1.161 40 0.131 39 0.129 04 0.006 87 783 150 783 62 782 39 100.1 BC1-13-119 0.71 0.055 13 0.004 50 0.498 17 0.038 59 0.065 52 0.001 95 417 120 410 26 409 12 100.2 BC1-13-120 0.56 0.064 37 0.004 40 1.115 09 0.070 84 0.125 63 0.003 98 754 81 761 34 763 23 99.7 BC1-13-121 0.47 0.065 34 0.007 83 1.165 96 0.130 54 0.129 40 0.006 81 785 148 785 61 784 39 100.1 BC1-13-122 0.51 0.056 13 0.003 13 0.565 25 0.029 30 0.073 03 0.001 79 458 72 455 19 454 11 100.2 BC1-13-123 0.16 0.075 34 0.002 40 1.669 75 0.046 25 0.160 75 0.002 53 1 078 65 997 18 961 14 103.7 BC1-13-124 0.86 0.066 13 0.002 60 1.215 54 0.043 99 0.133 30 0.002 77 810 42 808 20 807 16 100.1 BC1-13-125 0.41 0.068 66 0.003 84 1.414 22 0.072 62 0.149 36 0.004 38 889 59 895 31 897 25 99.8 BC1-13-126 0.16 0.154 39 0.002 15 8.490 68 0.109 39 0.398 81 0.005 30 2 395 10 2 285 12 2 164 24 110.7 BC1-13-127 0.68 0.062 99 0.007 70 1.011 76 0.117 29 0.116 47 0.005 56 708 167 710 59 710 32 100.0 BC1-13-128 0.13 0.071 28 0.001 84 1.583 29 0.037 59 0.161 08 0.002 56 965 24 964 15 963 14 100.1 BC1-13-129 0.50 0.178 71 0.002 38 12.754 32 0.161 25 0.517 55 0.006 98 2 641 10 2 662 12 2 689 30 98.2 BC1-13-130 0.46 0.072 79 0.001 74 1.416 58 0.030 86 0.141 14 0.002 13 1 008 22 896 13 851 12 105.3 BC1-13-131 0.56 0.161 76 0.003 12 10.442 17 0.190 29 0.468 14 0.008 19 2 474 14 2 475 17 2 475 36 100.0 BC1-13-132 0.09 0.118 52 0.001 49 5.644 59 0.065 59 0.345 36 0.004 10 1 934 10 1 923 10 1 912 20 101.2
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附表 2 巴楚地区碎屑锆石Lu-Hf同位素分析结果
附表 2. Zircon Lu-Hf isotope analysis results from Bachu Area
样品点 年龄 (Ma) 176Yb/177Hf 2σ 176Lu/177Hf 2σ 176Hf/177Hf 2σ 176Hf/177Hfi TDM(Ma) TDMC(Ma) εHf(0) εHf(t) 2σ fLu/Hf BC3-9-001 837 0.022 296 0.001 540 0.000 666 0.000 046 0.281 914 0.000 029 0.281 903 1 864 2 509 -30.3 -12.3 1.0 -0.98 BC3-9-002 868 0.020 943 0.000 086 0.000 690 0.000 004 0.282 214 0.000 031 0.282 203 1 452 1 821 -19.7 -1.0 1.1 -0.98 BC3-9-003 2 490 0.040 626 0.000 265 0.001 028 0.000 008 0.281 187 0.000 033 0.281 138 2 878 3 138 -56.1 -1.9 1.2 -0.97 BC3-9-004 1 936 0.002 016 0.000 034 0.000 042 0.000 001 0.281 428 0.000 021 0.281 427 2 485 2 866 -47.5 -4.4 0.7 -1.00 BC3-9-005 828 0.008 396 0.000 115 0.000 244 0.000 002 0.282 018 0.000 024 0.282 014 1 702 2 268 -26.7 -8.5 0.8 -0.99 BC3-9-007 475 0.020 330 0.000 291 0.000 650 0.000 008 0.282 586 0.000 032 0.282 580 934 1 220 -6.6 3.7 1.1 -0.98 BC3-9-008 531 0.025 969 0.000 136 0.000 765 0.000 002 0.282 348 0.000 023 0.282 340 1 269 1 725 -15.0 -3.6 0.8 -0.98 BC3-9-009 1 912 0.012 193 0.000 080 0.000 354 0.000 003 0.281 263 0.000 027 0.281 250 2 727 3 278 -53.4 -11.2 1.0 -0.99 BC3-9-010 1 900 0.002 013 0.000 045 0.000 040 0.000 001 0.281 415 0.000 023 0.281 414 2 503 2 919 -48.0 -5.7 0.8 -1.00 BC3-9-011 853 0.022 692 0.000 058 0.000 676 0.000 004 0.282 229 0.000 024 0.282 219 1 430 1 795 -19.2 -0.7 0.9 -0.98 BC3-9-012 853 0.019 110 0.000 030 0.000 532 0.000 001 0.281 954 0.000 026 0.281 945 1 803 2 406 -28.9 -10.4 0.9 -0.98 BC3-9-013 512 0.019 828 0.000 283 0.000 561 0.000 011 0.282 239 0.000 022 0.282 234 1 412 1 973 -18.8 -7.8 0.8 -0.98 BC3-9-014 433 0.063 088 0.000 610 0.001 775 0.000 020 0.282 567 0.000 029 0.282 553 989 1 308 -7.2 1.8 1.0 -0.95 BC3-9-015 2 090 0.010 666 0.000 220 0.000 317 0.000 005 0.281 561 0.000 022 0.281 549 2 324 2 485 -42.8 3.5 0.8 -0.99 BC3-9-016 2 489 0.024 117 0.000 249 0.000 621 0.000 004 0.281 039 0.000 030 0.281 010 3 046 3 428 -61.3 -6.5 1.1 -0.98 BC3-9-017 798 0.023 488 0.000 165 0.000 694 0.000 005 0.281 874 0.000 023 0.281 864 1 919 2 620 -31.7 -14.5 0.8 -0.98 BC3-9-018 879 0.019 750 0.000 037 0.000 589 0.000 003 0.282 287 0.000 026 0.282 278 1 346 1 645 -17.1 1.9 0.9 -0.98 BC3-9-019 731 0.014 669 0.000 373 0.000 417 0.000 011 0.282 352 0.000 025 0.282 346 1 251 1 585 -14.8 1.1 0.9 -0.99 BC3-9-020 337 0.038 792 0.000 375 0.000 979 0.000 005 0.282 787 0.000 031 0.282 781 658 853 0.5 7.7 1.1 -0.97 BC3-9-021 2 521 0.010 328 0.000 110 0.000 288 0.000 002 0.281 074 0.000 027 0.281 060 2 974 3 292 -60.1 -4.0 1.0 -0.99 BC3-9-023 791 0.023 481 0.000 130 0.000 683 0.000 002 0.282 026 0.000 026 0.282 016 1 710 2 287 -26.4 -9.3 0.9 -0.98 BC3-9-024 855 0.070 849 0.001 596 0.002 167 0.000 048 0.282 206 0.000 033 0.282 171 1 522 1 900 -20.0 -2.4 1.2 -0.93 BC3-9-025 923 0.036 907 0.000 093 0.000 986 0.000 006 0.282 190 0.000 025 0.282 173 1 497 1 853 -20.6 -0.8 0.9 -0.97 BC3-9-026 2 557 0.024 845 0.002 873 0.000 676 0.000 075 0.281 300 0.000 033 0.281 267 2 700 2 799 -52.1 4.2 1.2 -0.98 BC3-9-027 473 0.026 296 0.000 041 0.000 721 0.000 001 0.282 262 0.000 024 0.282 256 1 386 1 948 -18.0 -7.8 0.9 -0.98 BC3-9-028 891 0.027 072 0.000 288 0.000 743 0.000 009 0.282 128 0.000 028 0.282 116 1 572 2 001 -22.8 -3.5 1.0 -0.98 BC3-9-029 383 0.045 392 0.000 518 0.001 426 0.000 012 0.282 572 0.000 026 0.282 562 973 1 319 -7.1 1.0 0.9 -0.96 BC3-9-030 714 0.030 372 0.000 608 0.000 808 0.000 015 0.282 017 0.000 027 0.282 006 1 728 2 356 -26.7 -11.3 0.9 -0.98 BC3-9-031 540 0.040 326 0.000 188 0.001 118 0.000 004 0.282 474 0.000 023 0.282 463 1 103 1 443 -10.5 1.0 0.8 -0.97 BC3-9-032 445 0.042 257 0.000 157 0.001 084 0.000 001 0.282 519 0.000 033 0.282 510 1 039 1 398 -9.0 0.5 1.2 -0.97 BC3-9-033 524 0.014 824 0.000 090 0.000 394 0.000 001 0.282 193 0.000 023 0.282 189 1 469 2 065 -20.5 -9.1 0.8 -0.99 BC3-9-034 460 0.013 481 0.000 073 0.000 377 0.000 001 0.282 541 0.000 026 0.282 537 990 1 326 -8.2 1.8 0.9 -0.99 BC3-9-035 449 0.036 267 0.000 072 0.001 080 0.000 005 0.282 533 0.000 023 0.282 524 1 019 1 363 -8.4 1.1 0.8 -0.97 BC3-9-036 455 0.034 820 0.000 881 0.000 997 0.000 020 0.282 423 0.000 026 0.282 414 1 172 1 606 -12.3 -2.6 0.9 -0.97 BC3-9-037 2 346 0.039 009 0.000 116 0.001 022 0.000 003 0.281 458 0.000 029 0.281 412 2 508 2 616 -46.5 4.5 1.0 -0.97 BC3-9-038 1 569 0.063 199 0.000 297 0.001 712 0.000 013 0.281 496 0.000 024 0.281 445 2 501 3 066 -45.1 -12.1 0.9 -0.95 BC3-9-039 453 0.055 479 0.000 762 0.001 496 0.000 015 0.282 546 0.000 026 0.282 533 1 012 1 339 -8.0 1.5 0.9 -0.95 BC3-9-040 816 0.023 460 0.000 852 0.000 614 0.000 014 0.282 028 0.000 031 0.282 018 1 705 2 267 -26.3 -8.7 1.1 -0.98 BC3-9-042 467 0.033 734 0.000 944 0.001 047 0.000 025 0.282 526 0.000 023 0.282 516 1 029 1 369 -8.7 1.2 0.8 -0.97 BC3-9-043 493 0.029 252 0.000 126 0.000 759 0.000 001 0.282 085 0.000 026 0.282 078 1 632 2 330 -24.3 -13.7 0.9 -0.98 BC3-9-045 638 0.040 300 0.000 423 0.001 115 0.000 011 0.282 068 0.000 029 0.282 055 1 671 2 294 -24.9 -11.3 1.0 -0.97 BC3-9-046 486 0.034 697 0.000 387 0.001 129 0.000 014 0.282 658 0.000 024 0.282 648 844 1 060 -4.0 6.3 0.8 -0.97 BC3-9-047 2 506 0.015 872 0.000 143 0.000 421 0.000 003 0.280 954 0.000 022 0.280 934 3 144 3 586 -64.3 -8.8 0.8 -0.99 BC3-9-048 2 494 0.006 138 0.000 108 0.000 180 0.000 003 0.280 560 0.000 023 0.280 551 3 643 4 445 -78.2 -22.7 0.8 -0.99 BC3-9-049 409 0.028 133 0.000 409 0.000 859 0.000 011 0.282 194 0.000 027 0.282 188 1 486 2 139 -20.4 -11.7 0.9 -0.97 BC3-9-050 463 0.055 671 0.000 321 0.001 560 0.000 009 0.282 574 0.000 027 0.282 560 974 1 273 -7.0 2.7 1.0 -0.95 BC3-9-051 795 0.012 529 0.000 123 0.000 358 0.000 003 0.281 939 0.000 028 0.281 934 1 815 2 467 -29.5 -12.1 1.0 -0.99 BC3-9-052 2 226 0.019 708 0.000 201 0.000 538 0.000 004 0.281 186 0.000 029 0.281 163 2 843 3 262 -56.1 -7.1 1.0 -0.98 BC3-9-053 503 0.061 696 0.000 921 0.001 674 0.000 023 0.282 355 0.000 030 0.282 339 1 290 1 744 -14.8 -4.2 1.0 -0.95 BC3-9-054 463 0.026 657 0.000 533 0.000 700 0.000 012 0.282 172 0.000 026 0.282 166 1 510 2 154 -21.2 -11.2 0.9 -0.98 BC3-9-055 1 824 0.029 825 0.000 221 0.000 907 0.000 004 0.281 583 0.000 025 0.281 552 2 330 2 660 -42.0 -2.5 0.9 -0.97 BC3-9-056 746 0.039 102 0.000 505 0.001 070 0.000 016 0.282 059 0.000 025 0.282 044 1 682 2 253 -25.2 -9.3 0.9 -0.97 BC3-9-057 2 479 0.001 100 0.000 010 0.000 025 0.000 000 0.281 079 0.000 023 0.281 078 2 948 3 282 -59.9 -4.3 0.8 -1.00 BC3-9-058 790 0.034 835 0.000 531 0.000 905 0.000 015 0.282 077 0.000 025 0.282 064 1 650 2 181 -24.6 -7.6 0.9 -0.97 BC3-9-059 2 422 0.029 372 0.000 272 0.000 794 0.000 008 0.280 799 0.000 028 0.280 762 3 382 4 027 -69.8 -16.9 1.0 -0.98 BC3-9-060 829 0.013 782 0.000 319 0.000 383 0.000 009 0.282 015 0.000 027 0.282 009 1 712 2 279 -26.8 -8.7 1.0 -0.99 BC3-9-061 2 176 0.028 289 0.000 745 0.000 907 0.000 027 0.281 532 0.000 028 0.281 495 2 399 2 548 -43.8 3.5 1.0 -0.97 BC3-9-062 767 0.011 698 0.000 298 0.000 323 0.000 008 0.282 042 0.000 029 0.282 037 1 673 2 254 -25.8 -9.1 1.0 -0.99 BC3-9-063 1 558 0.020 708 0.000 071 0.000 629 0.000 001 0.281 444 0.000 021 0.281 425 2 502 3 117 -47.0 -13.0 0.7 -0.98 BC3-9-064 462 0.013 897 0.000 024 0.000 373 0.000 001 0.282 263 0.000 028 0.282 260 1 372 1 945 -18.0 -7.9 1.0 -0.99 BC3-9-065 1 642 0.015 514 0.000 166 0.000 430 0.000 004 0.281 479 0.000 031 0.281 466 2 441 2 972 -45.7 -9.7 1.1 -0.99 BC3-9-067 785 0.031 018 0.000 551 0.000 923 0.000 015 0.281 999 0.000 028 0.281 985 1 759 2 359 -27.3 -10.5 1.0 -0.97 BC3-9-068 449 0.086 070 0.002 874 0.002 424 0.000 078 0.282 478 0.000 031 0.282 457 1 137 1 513 -10.4 -1.2 1.1 -0.93 BC3-9-069 465 0.024 269 0.000 251 0.000 761 0.000 009 0.282 512 0.000 024 0.282 505 1 040 1 396 -9.2 0.8 0.8 -0.98 BC3-9-070 815 0.027 274 0.000 305 0.000 818 0.000 008 0.282 285 0.000 023 0.282 273 1 358 1 697 -17.2 0.3 0.8 -0.98 BC3-9-071 824 0.020 875 0.000 019 0.000 613 0.000 002 0.282 137 0.000 021 0.282 127 1 555 2 018 -22.5 -4.6 0.7 -0.98 BC3-9-072 457 0.018 692 0.000 073 0.000 512 0.000 001 0.282 625 0.000 027 0.282 620 877 1 141 -5.2 4.7 1.0 -0.98 BC3-9-073 631 0.023 557 0.000 026 0.000 617 0.000 002 0.281 868 0.000 029 0.281 861 1 924 2 728 -32.0 -18.3 1.0 -0.98 BC3-9-074 757 0.022 691 0.000 330 0.000 603 0.000 008 0.282 141 0.000 024 0.282 132 1 549 2 049 -22.3 -5.9 0.9 -0.98 BC3-9-075 459 0.016 943 0.000 230 0.000 460 0.000 005 0.282 530 0.000 027 0.282 526 1 008 1 353 -8.6 1.4 1.0 -0.99 BC3-9-076 469 0.012 024 0.000 142 0.000 333 0.000 003 0.282 465 0.000 030 0.282 462 1 093 1 490 -10.9 -0.6 1.1 -0.99 BC3-9-077 836 0.037 611 0.000 444 0.001 118 0.000 009 0.282 141 0.000 028 0.282 124 1 569 2 018 -22.3 -4.5 1.0 -0.97 BC3-9-078 1 811 0.012 608 0.000 070 0.000 350 0.000 001 0.281 382 0.000 020 0.281 369 2 568 3 078 -49.2 -9.3 0.7 -0.99 BC3-9-079 388 0.031 042 0.000 302 0.001 001 0.000 009 0.282 520 0.000 022 0.282 513 1 036 1 427 -8.9 -0.6 0.8 -0.97 BC3-9-081 751 0.048 490 0.001 083 0.001 485 0.000 022 0.281 931 0.000 033 0.281 910 1 881 2 548 -29.8 -13.9 1.2 -0.96 BC3-9-082 932 0.033 558 0.000 235 0.000 882 0.000 005 0.282 068 0.000 023 0.282 052 1 662 2 117 -24.9 -4.9 0.8 -0.97 BC3-9-083 2 428 0.027 319 0.001 095 0.000 769 0.000 031 0.281 419 0.000 026 0.281 383 2 545 2 624 -47.8 5.4 0.9 -0.98 BC3-9-084 895 0.004 963 0.000 098 0.000 113 0.000 003 0.281 963 0.000 018 0.281 961 1 771 2 344 -28.6 -8.9 0.6 -1.00 BC3-9-085 839 0.029 729 0.000 024 0.000 859 0.000 001 0.282 310 0.000 021 0.282 296 1 325 1 629 -16.3 1.7 0.8 -0.97 BC3-9-086 975 0.031 039 0.000 118 0.000 802 0.000 001 0.282 093 0.000 022 0.282 078 1 623 2 032 -24.0 -3.0 0.8 -0.98 BC3-9-087 1 545 0.049 014 0.000 428 0.001 463 0.000 017 0.281 577 0.000 023 0.281 535 2 372 2 883 -42.2 -9.4 0.8 -0.96 BC3-9-088 827 0.039 549 0.000 826 0.001 030 0.000 019 0.281 982 0.000 024 0.281 966 1 788 2 376 -27.9 -10.3 0.9 -0.97 BC3-9-090 2 339 0.012 824 0.000 055 0.000 340 0.000 001 0.281 283 0.000 022 0.281 268 2 699 2 950 -52.7 -0.8 0.8 -0.99 BC3-9-091 2 663 0.020 562 0.000 038 0.000 595 0.000 003 0.281 133 0.000 021 0.281 103 2 918 3 095 -57.9 0.8 0.8 -0.98 BC3-9-092 2 573 0.027 123 0.000 319 0.000 726 0.000 006 0.281 105 0.000 024 0.281 069 2 966 3 235 -58.9 -2.4 0.9 -0.98 BC3-9-093 1 756 0.060 373 0.000 602 0.001 692 0.000 014 0.281 585 0.000 031 0.281 528 2 376 2 758 -42.0 -4.9 1.1 -0.95 BC3-9-094 2 514 0.021 204 0.000 273 0.000 664 0.000 010 0.281 122 0.000 027 0.281 090 2 938 3 229 -58.3 -3.1 0.9 -0.98 BC3-9-095 818 0.032 656 0.000 125 0.000 873 0.000 001 0.282 081 0.000 025 0.282 067 1 644 2 156 -24.4 -6.9 0.9 -0.97 BC3-9-096 447 0.042 978 0.000 396 0.001 192 0.000 011 0.282 447 0.000 029 0.282 437 1 144 1 560 -11.5 -2.0 1.0 -0.96 BC3-9-097 472 0.021 924 0.000 065 0.000 582 0.000 001 0.282 525 0.000 026 0.282 519 1 018 1 359 -8.7 1.5 0.9 -0.98 BC3-9-098 475 0.030 473 0.000 189 0.000 839 0.000 003 0.282 245 0.000 029 0.282 237 1 415 1 988 -18.6 -8.5 1.0 -0.97 BC3-9-099 1 864 0.109 516 0.000 656 0.002 817 0.000 006 0.281 678 0.000 024 0.281 578 2 315 2 573 -38.7 -0.6 0.9 -0.92 BC3-9-100 925 0.019 952 0.000 443 0.000 522 0.000 009 0.281 736 0.000 023 0.281 727 2 099 2 845 -36.6 -16.5 0.8 -0.98 BC3-9-101 1 066 0.028 096 0.000 359 0.000 715 0.000 008 0.281 946 0.000 023 0.281 931 1 823 2 303 -29.2 -6.1 0.8 -0.98 BC3-9-102 777 0.032 306 0.000 388 0.000 866 0.000 008 0.282 111 0.000 025 0.282 098 1 601 2 112 -23.4 -6.7 0.9 -0.97 BC3-9-103 458 0.008 741 0.000 073 0.000 281 0.000 002 0.281 924 0.000 027 0.281 921 1 832 2 697 -30.0 -20.0 1.0 -0.99 BC3-9-104 472 0.080 360 0.006 264 0.002 104 0.000 156 0.282 497 0.000 029 0.282 478 1 100 1 452 -9.7 0.0 1.0 -0.94 BC3-9-105 802 0.008 430 0.000 081 0.000 240 0.000 003 0.282 515 0.000 030 0.282 511 1 022 1 165 -9.1 8.5 1.1 -0.99 BC3-9-106 1 812 0.018 897 0.000 446 0.000 515 0.000 012 0.281 390 0.000 025 0.281 372 2 568 3 071 -48.9 -9.1 0.9 -0.98 BC3-9-107 735 0.026 037 0.000 042 0.000 750 0.000 001 0.282 216 0.000 029 0.282 206 1 451 1 898 -19.7 -3.8 1.0 -0.98 BC3-9-108 2 351 0.010 220 0.000 117 0.000 257 0.000 001 0.281 064 0.000 025 0.281 052 2 985 3 426 -60.4 -8.2 0.9 -0.99 BC3-9-109 389 0.026 865 0.000 121 0.000 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