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引用本文:王 永1 李德贵2 肖序常1 迟振卿1 闵隆瑞1 王 军1 王彦斌1. 西昆仑山前晚新生代构造活动与青藏高原西北缘的隆升[J]. 中国地质, 2006, 33(1): 41-47.
WANG Yong1, LEE Tehquei2, XIAO Xu-chang1, CHI Zhen-qing1, MIN Long-rui1, WANG Jun1, WANG Yan-bin1. Late Cenozoic tectonic movement in the front of the West Kunlun Mountains and uplift of the northwestern margin of the Qinghai-Tibetan Plateau[J]. Geology in China, 2006, 33(1): 41-47(in Chinese with English abstract).
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西昆仑山前晚新生代构造活动与青藏高原西北缘的隆升
王 永1 李德贵2 肖序常1 迟振卿1 闵隆瑞1 王 军1 王彦斌11,2
1. 中国地质科学院地质研究所,北京 100037;2. “中央研究院”地球科学研究所,台湾 台北
摘要:
提要:西昆仑山前晚新生代地貌与沉积特征记录了西昆仑山及青藏高原西北缘的隆升过程。利用沉积学、地貌学、古地磁研究结果,对西昆仑晚新生代构造活动进行了探讨。约25 Ma,西昆仑山前沉积面貌发生显著变化,反映西昆仑山整体开始隆升;约5 Ma时,西昆仑山前磨拉石发育,表明西昆仑山开始快速隆升。古地磁结果表明:始新世—中新世西昆仑有显著的旋转运动,而第四纪以来水平挤压造成的垂直运动为主,没有明显的旋转运动。河流阶地发育显示,西昆仑地区约在1.2 Ma时河流下切开始形成阶地,第四纪中晚期以来西昆仑地区构造抬升幅度与频率加快,全新世中期(约5 kaB.P.)有一次快速隆升过程。
关键词:  西昆仑  晚新生代  青藏高原  隆升
DOI:
分类号:
基金项目:国家自然科学基金项目(40302027)、中国地质调查局地质大调查项目(200313000059)和国土资源部青藏高原专项(200102010402)共同资助。
Late Cenozoic tectonic movement in the front of the West Kunlun Mountains and uplift of the northwestern margin of the Qinghai-Tibetan Plateau
WANG Yong1, LEE Tehquei2, XIAO Xu-chang1, CHI Zhen-qing1, MIN Long-rui1, WANG Jun1, WANG Yan-bin11,2
1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2. Institute of Earth Sciences, Academia Sinica, Taipei, China
Abstract:
Abstract:The Late Cenozoic geomorphologic and sedimentary features in the West Kunlun Mountain front record the uplift process of the West Kunlun Mountains and the western margin of the Qinghai-Tibet Plateau. Based on geomorphologic and paleomagnetic studies, the Late Cenozoic tectonic movement in the West Kunlun are discussed. At about 25 Ma, significant change took place in sedimentary features in the West Kunlun Mountain front, reflecting that the West Kunlun began to be uplifted, and at about 5 Ma, molasse developed in the West Kunlun Mountain front, indicating that the West Kunlun began to be uplifted rapidly. Paleomagnetic results show that marked clockwise rotational movements occurred in the Eocene-Miocene, while vertical movements resulting from horizontal compression have predominated in the Quaternary and no marked rotational movement during this period. The downward incision of the rivers in the West Kunlun at about 1.2 Ma gave rise to terraces. Since the Mid-late Quaternary, the magnitude and frequency of the tectonic uplift have increased, and a rapid tectonic uplift event took place in the middle Holocene (at about 5 ka).
Key words:  West Kunlun  Late Cenozoic  Qinghai-Tibetan Plateau  uplift