JURASSIC DEFORMATION AT THE WESTERN MARGIN OF THE EAST ASIA CONTINENT: A CASE STUDY OF DUCTILE DEFORMATION IN THE CENTRAL SEGMENT OF THE BANGONG CO-NUJIANG BELT
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摘要:
班公湖-怒江带作为羌塘地块与拉萨地块晚中生代聚合而形成巨型构造带，其形成时代与如何汇聚是构造研究关键所在。本次研究选择班公湖—怒江带中段的安多—聂荣地块发育为研究区，对地块内部基底发育的近东西走向的韧性剪切带，开展了韧性剪切变形分析与同构造年代学研究。剪切带面理和线理测量分析指示北东—南西向构造挤压，其同构造矿物40Ar/39Ar的测试分析获得年龄约为167 Ma，表明班公湖-怒江带中段形成于中侏罗世中期北东—南西向汇聚的构造背景下。结合区域构造分析，东亚大陆西缘羌塘地块与拉萨地块在中侏罗世中期以北东—南西向碰撞聚合的构造方式完成大陆拼接，为东亚大陆西缘中侏罗世变形提供了直接构造证据。
Abstract:The Bangong Co-Nujiang belt resulted from the convergence and collision between the Chiangtang and Lhasa blocks in late Mesozoic. The key issue in this tectonic study is when and how the belt was formed. With the Ando-Nyainrong block of the central segment of the Bangong Co-Nujiang belt as the study area, the ductile shear belts with approximately E-W strike developed in the internal basement of the block are studied based on ductile shear deformation analysis and syntectonic geochronology. The foliation and lineation measurement and analysis of the shear belts indicate tectonic compression with NE-SW strike. Through the test analysis of 40Ar/39Ar in syntectonic minerals, the age is worked out as 167 Ma. All the evidence shows that the central segment of the Bangong Co-Nujiang belt was caused under the convergence and collision between the Chiangtang and Lhasa blocks in the middle of Middle Jurassic, which provides direct tectonic evidence for the Jurassic deformation at the western margin of the East Asian continent.
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表 1 安多—聂荣地块韧性剪切变形测量结果与北东—南西向挤压构造应力场
Table 1. Results of ductile shear deformation analysis and the NE-SW direction compressional tectonic stress field in the Ando-Nyainrong block
点号 经度(E) 纬度(N) 数据量 σ1(az°/pl°) σ2(az°/pl°) σ3(az°/pl°) R D20 92°20′01″ 32°07′16″ 19 333/41 085/22 196/39 0.7 D21 92°18′45″ 32°07′29″ 5 186/34 047/47 292/21 0.7 D22 92°17′44″ 32°06′26″ 5 153/29 248/08 353/58 0.2 D25 92°12′14″ 32°03′23″ 4 320/43 111/42 215/15 0.3 D28 92°04′05″ 31°47′32″ 4 NNE-SSW D45 93°06′34″ 31°50′10″ 9 320/18 097/65 225/15 0.1 D53 91°42′06″ 31°52′51″ 7 244/24 137/33 002/46 0.8 D55 91°41′49″ 32°06′05″ 4 063/05 157/29 323/59 0.5 D56 91°42′45″ 32°07′15″ 7 100/17 209/45 355/39 0.5 D70 91°40′56″ 32°02′05″ 5 030/15 297/11 172/70 0.4 注：σ1—最大主应力；σ2—中间主应力；σ3—最小主应力；az—倾伏向；pl—倾伏角；R=(σ2-σ3/σ1-σ3) 
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表 2 安多—聂荣地块西南缘韧性剪切带(观测点D53)40Ar/39Ar坪年龄与等时线年龄
Table 2. 40Ar/39Ar plateau age and isochron age of the ductile shear belts at the southwest margin of the Ando-Nyainrong block(Site D53)
T/℃ (40Ar/ 39Ar) m (36Ar/ 39Ar) m (37Ar 0/ 39Ar) m (38Ar/ 39Ar) m 40Ar/% F 39Ar/10 -14mol 39Ar(Cum.)/% Age/Ma ±1σ/Ma D53-1钾长石 W=27.71 mg J=0.002684 Total age=161.0Ma 700 165.8118 0.1561 0.7508 0.0540 72.22 119.8151 0.06 0.33 503.0 5.9 800 31.5490 0.0041 0.0206 0.0137 96.14 30.3332 1.28 6.84 141.2 1.4 860 28.0541 0.0010 0.0474 0.0129 98.90 27.7466 0.80 10.93 129.6 1.3 920 28.3819 0.0031 0.1538 0.0141 96.81 27.4801 0.62 14.06 128.4 1.3 980 28.7767 0.0015 0.1156 0.0130 98.46 28.3349 0.35 15.83 132.2 1.4 1040 30.5556 0.0048 0.0293 0.0139 95.30 29.1211 0.64 19.07 135.8 1.4 1100 34.8159 0.0072 0.0410 0.0148 93.85 32.6757 1.03 24.32 151.6 1.5 1160 37.8379 0.0090 0.0237 0.0147 92.95 35.1694 1.65 32.70 162.7 1.6 1210 38.8774 0.0080 0.0170 0.0147 93.90 36.5066 3.23 49.13 168.6 1.6 1260 38.2769 0.0067 0.0052 0.0142 94.83 36.2989 6.82 83.80 167.7 1.6 1290 37.4411 0.0059 0.0204 0.0141 95.33 35.6945 2.62 97.10 165.0 1.6 1330 37.8766 0.0080 0.1179 0.0146 93.74 35.5089 0.43 99.27 164.2 1.7 1400 40.3533 0.0196 0.3614 0.0165 85.72 34.5995 0.14 100.00 160.2 2.4 D56-1黑云母 W=33.07 mg J=0.002735 Total age=165.6Ma 700 56.7666 0.1419 1.2378 0.0440 26.28 14.9359 0.06 0.37 72.2 5.2 760 36.0626 0.0190 0.1219 0.0169 84.48 30.4678 1.00 6.30 144.4 1.4 800 36.3997 0.0037 0.0783 0.0139 96.99 35.3058 1.61 15.86 166.3 1.6 840 36.1519 0.0021 0.0000 0.0133 98.24 35.5169 1.64 25.62 167.3 1.6 880 36.0022 0.0024 0.1252 0.0138 98.05 35.3049 1.15 32.45 166.3 1.6 920 36.0515 0.0017 0.0771 0.0134 98.59 35.5449 1.15 39.31 167.4 1.6 960 36.0165 0.0019 0.1006 0.0134 98.47 35.4710 1.13 46.01 167.0 1.6 1000 36.2395 0.0019 0.0167 0.0131 98.46 35.6825 1.13 52.75 168.0 1.6 1040 35.9673 0.0014 0.0470 0.0134 98.82 35.5425 2.20 65.84 167.4 1.6 1080 36.0125 0.0015 0.0312 0.0133 98.78 35.5726 2.63 81.46 167.5 1.6 1200 36.1565 0.0014 0.0076 0.0130 98.88 35.7507 2.96 99.05 168.3 1.6 1400 39.5904 0.0179 0.7467 0.0179 86.78 34.3776 0.16 100.00 162.1 2.3 注：表中下标m代表样品中测定的同位素比值，F=40Ar*/39Ar, is the ratio of radiogenic Argon40 and Argon39
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