| 喀喇昆仑断裂北段晚第四纪活动特征及其构造意义 |
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| 引用本文：赵一霖,刘健,姜科庆,祝明伟.2019.喀喇昆仑断裂北段晚第四纪活动特征及其构造意义[J].地球学报,40(4):601-613. |
| DOI：10.3975/cagsb.2019.010701 |
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| 基金项目:中国地质调查局项目(编号: DD20160060) |
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| 中文摘要:右旋走滑的喀喇昆仑断裂(KK F)作为青藏高原的西部边界, 在印度板块与欧亚板块碰撞引起的陆内变形过程中扮演了重要的角色。近年来KK F北段全新世以来的活动特征存在争议。通过遥感解译和野外观测, 在喀喇昆仑断裂(KK F)的北段——新疆卡拉苏地区, 对KK F及其两条分支断裂的几何学、运动学进行了研究, 获得了现今发育的冰水扇被右旋错断和冰水扇上分布羽列式T张破裂等指示KK F右旋走滑的证据。采集了KK F控制的浅冰水湖相沉积中贝壳的AMS 14C样品, 获得年龄分别为(5.20±0.03) ka、(5.61±0.03) ka 和(9.95±0.04) ka。表明KK F北段晚全新世以来仍在活动, 其右旋走滑速率约为3.7 mm/a, 累计垂向滑移速率约为1.7 mm/a。据前人在KK F中部的研究成果, 推测KK F北段在卡拉苏地区由南东往北西右旋走滑速率有增大的趋势。 |
| 中文关键词:全新世 喀喇昆仑断裂 活动断裂 走滑速率 浅冰湖沉积 |
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| Late Quaternary Activity Characteristics and Tectonic Significance of the Northern Karakorum Fault |
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| Abstract:The right-lateral strike-slip Karakoram fault (KK F), as the western boundary of the Tibetan Plateau, plays an important role in the intracontinental deformation caused by the collision of the Indian plate and the Eurasian plate. In recent years, the activity characteristics of KK F since the Holocene have been controversial. Through remote sensing and field observation in the northern Karakoram fault (KK F) - Karasu region in Xinjiang, geometrical, kinematic characteristics of KK F and its two branch faults were studied, and the evidence that the developed ice water fan is broken by right-lateral strike-slip and that the distribution of plume T fracture on the ice water fan indicates the right-lateral strike-slip of KK F was obtained. AMS 14C samples of shells in the lacustrine deposits controlled by KK F were collected, and the ages are (5.20±0.03) ka, (5.61±0.03) ka and (9.95±0.04) ka, respectively. It indicates that the northern KK F is still active since late Holocene, with a right-lateral slip rate of about 3.7 mm/a and cumulative vertical slip rate of about 1.7 mm/a. According to the previous research results in the central part of KK F, it is inferred that the right-lateral strike-slip rate of the northern section of KK F in Karasu region tends to increase from southeast to northwest. |
| keywords:Holocene Karakorum fault active fault strike-slip rate shallow glacial lacustrine sedimentary facies |
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