| 中国南天山西部冲断褶皱系前缘区的运动学特征 |
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| 引用本文： | 肖安成,贾承造,杨树锋,陈汉林,魏国齐,张春生.中国南天山西部冲断褶皱系前缘区的运动学特征[J].沉积学报,2000,18(3):439-444. |
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| 作者姓名： | 肖安成 贾承造 杨树锋 陈汉林 魏国齐 张春生 |
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| 作者单位： | 1 浙江大学地球科学系 杭州 310027; |
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| 摘 要： | 南天山冲断褶皱系是中-上新世以来形成的以薄皮滑脱为主的冲断构造,冲断作用导致了盆地内及周缘区古-新生界的碎屑岩和碳酸盐岩地层发主形变。本文对该冲断系前缘区 (巴音库鲁提北部至喀什地区 )的运动学特征进行了研究。南天山冲断褶皱系从平面上分出了六个冲断褶皱带。从剖面上划分出两种不同的冲断体系。冲断系的前锋为盲冲结构的构造三角带。冲断作用导致前锋区中新世以来层系变形、抬升并出露地表,本区有两个区域性的主滑脱面,冲断作用及断层相关褶皱的形成是冲断层沿主滑脱面向前陆方向逐渐推进的结果。同时发育的次级冲断层导致冲断褶皱带的复杂化。文章同时指出,南天山冲断褶皱系的冲断扩展顺序为逆序。这与塔里木盆地南缘西昆仑山前冲断带的活动方式相反,暗示着南天山构造带的运动学特征是独特的。利用平衡地质剖面的方法,在综合地质和地球物理资料的基础上,作出本区的构造横剖面图并进行了平衡恢复,从而得出南天山冲断褶皱系前缘区上新世以来的南北缩短率为30 %,缩短量为 5 0km,缩短速率为 9- 10mm/a。
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| 关 键 词： | 南天山 冲断带 运动学特征 平衡剖面 |
| 文章编号： | 1000-0550(2000)03-0439-06 |
| 收稿时间： | 1998-12-31 |
| 修稿时间： | 1998年12月31日 |
The Kinematics Characters of The Thrust- foldBelts Western Front Regions in Southern Tianshan , China |
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| XIAO An-cheng,JIA Cheng-Zao,YANG Shu-feng,CHEN Han-ling,WEI Guo-qi,ZHANG Chun-sheng.The Kinematics Characters of The Thrust- foldBelts Western Front Regions in Southern Tianshan , China[J].Acta Sedimentologica Sinica,2000,18(3):439-444. |
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| Authors: | XIAO An-cheng JIA Cheng-Zao YANG Shu-feng CHEN Han-ling WEI Guo-qi ZHANG Chun-sheng |
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| Institution: | 1 Zhejiang University Geoscience Department Hangzhou 310037;2 Tarim Oilfield Company CNPC Korla Xinjiang 841000;3 Langfang Peirolewrt Science Research Institute CNPC Langfang Hebei 102800;4 Jianghan Petroleum Insliluie Geology Department Jingzhou HuBei 434102 |
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| Abstract: | The Southern Tianshan thrust - fold systems are thin skin thrust structural belts formed after Miocene andPliocene. Thrusting resulted in Palaozoic - Cenozoic clastic and carbonate rocks deforming in basin and margins re-gions The kinematics characters of thrust front regions (Northern Bainkuluti and Kashi)were discussedTheSouthern Tianshan thrust - fold systems were divided into six structural belts on plane and two tectonic layers insection. The blind thrust structural deltas were formed in thrust belts front. Thrusting made for Miocene strata de-formation, uplift and denudation. There were two detachment surfaces. Thrusting on detachment surfaces gradu-ally spreaded toward foreland and formed fault- related folds. That embranchment faults formed during structureactivity made thrust belts more complication. The author indicated that thrust propagating of the Southern Tian-shan thrust - fold systems were inverted sequence. The results were different from sequence of thrust - fold belts inWestern Kunlun Mountain. It implicated that the Southern Tianshan thrust- fold systems were provided with u-nique kinematics characters. Using method of the balanced section, the structural crossing section was made andrestored on the based of geology and geophysical data. Sequentially these were got that shorting percentage of theSouthern Tianshan thrust- fold systems was 30％、that shorting amount was 50km and that shorting velocity was9 - 10mm/a. |
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| Keywords: | southern Tianshan thrust-fold belts kinematics characters balanced section |
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