塔里木盆地西缘晚新生代岩石磁学特征及其对区域构造活动的响应  

MAGNETIC CHARACTERISTICS OF LATE CENOZOIC ROCK AND ITS RESPONSE TO TECTONIC UPLIFT OF PERIPHERAL MOUNTAINS IN TARIM BASIN

作　　者：王雪鹏[1] 杨进云[1] 杜芳芳[1] 张曼[1] 吴小斌[1] 宋春晖[1] 

机构地区：[1]兰州大学资源环境学院&西部环境教育部重点实验室,甘肃兰州730000

出　　处：《甘肃地质》2010年第4期1-8,25,共9页Gansu Geology

基　　金：国家科技重大专项课题(编号:2008ZX05008-001-05);教育部高等学校博士点基金(编号:20090211110021);新教师基金(编号:20090211120028)的资助

摘　　要：本文在前人研究基础上,选择中国西部塔里木盆地、南天山及西昆仑3个重要大地构造单元交界部位的塔里木盆地西北缘喀什凹陷地区,通过对乌恰黑孜苇剖面晚新生代巨厚陆相沉积物岩石磁学特征的分析,结合岩性、古水流和物源变化等的研究,揭示了晚新生代以来区域存在5次构造活动事件,它们分别发生于渐新世末—中新世初、中中新世初、晚中新世初、晚中新世末—上新世初和上新世末—更新世。其中渐新世末—中新世初和上新世末—更新世的构造活动是该区两次重大事件,并与青藏高原构造隆升有关,前者造成西昆仑和南天山强烈上升使塔里木盆地西缘喀什凹陷地区中断了与古地中海的连通进入了陆盆沉积环境演化阶段,后者进一步造成西昆仑和南天山强烈上升、帕米尔—天山之间地壳强烈缩短以及该区现今地貌格局的形成。Kashigar depression of Western Tarim Basin is located in the junction area of three major continent tectonic units among Western Tarim Basin,southern Tianshan mountain and western Kunlun.By comprehensive analysis of rock magnetic characteristics of late Cenozoic sediment of Heiziwei outcrop section,in combination with study of lithological association and change of paleocurrent analysis and congener,five tectonic activity events were distinguished in this area,and they occurred from the end of the Oligocene...

关 键 词：塔里木盆地西缘 晚新生代 岩石磁学 构造活动 

分 类 号：P618.13[天文地球—矿床学]