| 库车坳陷沉降与天山中新生代构造活动 |
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| 引用本文： | 杨庚,钱祥麟.库车坳陷沉降与天山中新生代构造活动[J].新疆地质,1995(3). |
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| 作者姓名： | 杨庚 钱祥麟 |
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| 作者单位： | 中国地质大学地矿系，北京大学地质学系 |
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| 摘 要： | 位于塔里木盆地北缘、天山南侧的库车坳陷为中新生代发育的构造单元。坳陷与天山造山带在成因上紧密相连，坳陷的沉降是由于天山山体隆升扩展引起的岩石圈挠曲响应。根据纵横向不同位置盆地沉降史的分析对比，该坳陷为典型的挤压盆地。推测中生代时期天山造山带以走滑和逆冲作用为主，新生代时期至少在库车坳陷北缘，天山造山带以向南冲断作用为主。库车坳陷强烈沉降时期并不对应于粗碎屑沉积，而对应于细碎屑沉积时期，即天山造山带构造强烈活动时期。天山造山带强烈活动造成库车坳陷强烈沉降，其主要原因与塔里木板块南侧的羌塘地体、拉萨地体、科西斯坦杂岩和印度次大陆的增生碰撞有关。
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| 关 键 词： | 塔里木盆地，库车坳陷，沉降历史，中新生代，天山造山带 |
SUBSIDENCE OF THE KUQA DEPRESSION AND MESOZOICCENOZOIC STRUCTURAL REACTIVATIONS IN TIANSHAN |
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| Yang Gang, Qian Xianglin.SUBSIDENCE OF THE KUQA DEPRESSION AND MESOZOICCENOZOIC STRUCTURAL REACTIVATIONS IN TIANSHAN[J].Xinjiang Geology,1995(3). |
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| Authors: | Yang Gang Qian Xianglin |
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| Abstract: | The Kuqa depression, located between the Tianshan and Tarim in the northwest China, is a tectonic element in the Mesozoic-Cenozoic time. The Tianshan Orogeny is chronously related with subsiding basin. The subsidence of the Kuqa depression is a response to the lithospheric flexure derived from expansion during the uplifting of Tianshan. Subsidence history of the Kuqa basin indicates that it is a typical compressive one.The tranverse and longitudinal subsidence histories of different locations in the Kuqa depression show that the Mesozoic Tianshan were dominated by the strike-slip and thrusting,the Cenozoic by southward thrusting.The strong subsidence of the Kuqa basin occurred in the Middle-Late Triassic, Middle Jurassic, Early Cretaceous and the Late Cenozoic, not corresponding with the coarsen clastics, but the fine clastics, i. e., the periods of strong reactivations in the Tianshan.The strong subsidence of the Kuqa depression and the strong reactivations of the Tianshan were derived by the collision of the Qiangtang, Lhasa, the Kohistan-Dras and India blocks with the southern margin of the Tarim block. |
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| Keywords: | Tarim basin Kuqa depression subsidence history Mesozoic-Cenozic Tianshan Orogeny |
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