| 帕米尔-西昆仑北麓新生代前陆褶皱冲断带构造剖面分析 |
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| 引用本文： | 伍秀芳,刘胜,汪新,杨树锋,顾雪梅.帕米尔-西昆仑北麓新生代前陆褶皱冲断带构造剖面分析[J].地质科学,2004,39(2):260-271. |
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| 作者姓名： | 伍秀芳 刘胜 汪新 杨树锋 顾雪梅 |
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| 作者单位： | 浙江大学地球科学系,杭州,310027;中国石油天然气股份有限公司塔里木油田分公司,新疆,库尔勒,841000;中国石油天然气股份有限公司冀东油田勘探开发研究院,河北,唐山,063004 |
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| 摘 要： | 依据帕米尔—西昆仑北麓新生代前陆褶皱冲断带 3条构造剖面的详细分析,发现帕米尔—西昆仑北麓除山根地带发育高角度断层外,基本上以低角度逆掩断层为主,形成与逆冲推覆构造相关的褶皱变形。乌泊尔地区表现为由山脉向塔里木盆地滑移的隐伏冲断层和上覆褶皱;苏盖特—齐姆根—甫沙地区表现为山前的三角带和向盆地扩展的两排背斜带。帕米尔—西昆仑北麓前陆褶皱冲断带的主要构造变形时间始于上新世早期(距今约 4.6Ma),断层、褶皱的变形时代由山前向盆地逐步变新,变形强度由山脉向塔里木盆地逐步减弱。帕米尔—西昆仑北麓前陆褶皱冲断带的构造缩短量为 20～70km,缩短率为 35%～50%。
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| 关 键 词： | 前陆褶皱冲断带 地震剖面 叠瓦逆掩席 三角带 构造缩短率 帕米尔-西昆仑 |
| 文章编号： | 0563-5020(2004)02-0260-12 |
| 收稿时间： | 2002-11-06 |
| 修稿时间： | 2002年11月6日 |
ANALYSIS ON STRUCTURAL SECTIONS IN THE CENOZOIC PAMIR-WESTERN KUNLUN FORELAND FOLD-AND-THRUST BELT |
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| Wu Xiufang,Liu Sheng,Wang Xin,Yang Shufeng,Gu Xuemei.ANALYSIS ON STRUCTURAL SECTIONS IN THE CENOZOIC PAMIR-WESTERN KUNLUN FORELAND FOLD-AND-THRUST BELT[J].Chinese Journal of Geology,2004,39(2):260-271. |
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| Authors: | Wu Xiufang Liu Sheng Wang Xin Yang Shufeng Gu Xuemei |
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| Institution: | 1. Geosciences Department of Zhejiang University, Hangzhou 310027;2. Tarim Oil Field Branch Company, China National Petroleum Corp., Korla, Xinjiang 841000;3. Exploration & Development Research Institute, Jidong Oilfield, China National Petroleum Corp., Tangshan, Hebei 063004 |
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| Abstract: | The Pamir-Western Kunlun foreland fold-and-thrust belt was very important to study intraplate deformation in central Asia and hydrocarbon exploration. Based on detailed structural analysis of three cross sections which synthesized by seismic profiles, outcrops and drilling data in the area, the structural characters were studied and structural models of the Pamir-Western Kunlun foreland fold-and-thrust belt established. In the foreland fold-and-thrust belt there mainly were low-angle blind thrusts in addition to high-angle thrusts along the mountain’s piedmont. Two structural styles were presented: the thrust related structures due to underlying thrusts slipping from orogen to foreland basin in the Wupor zone, and the triangle zones formed by stack of 2～3 imbricate thrust sheets which plugged in undeformed strata towards foreland basin by means of wedges, so as to creat three rows of folded belt in the Sugaite Qimugen Fusha zone. The main tectonic deformation in the Pamir-Western Kunlun foreland fold-and-thrust belt started in Early Pliocene(about 4.6 Ma ago), and migrated gradually from the orogen to the foreland basin, with the faulting and folding becoming younger and weakened in the basin. The tectonic shortening amount increased from 23.3 km in the Wupor zone to 68 km in the Fusha zone, but the tectonic shortening rate kept in the range of 35%～50%. In addition, the possible hydrocarbon traps in the Pamir-Western Kunlun foreland fold-and-thrust belt were analyzed. |
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| Keywords: | Foreland fold and thrust belt Seismic reflection profiles Imbricate thrust sheet Triangle zone Tectonic shortening rate Pamir Western Kunlun |
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