西昆仑及邻区新生代差异隆升的热年代学证据  

Thermochronological Evidence of the Cenozoic Differential Uplift Processes of the West Kunlun and Its Adjacent Area

作　　者：曹凯[1,2] 王国灿[1,2] 刘超 孟艳宁[1,2] 

机构地区：[1]中国地质大学地质过程与矿产资源国家重点实验室,湖北武汉430074 [2]中国地质大学地球科学学院,湖北武汉430074 [3]辽宁省有色地质局勘察研究院,辽宁沈阳110013

出　　处：《地球科学（中国地质大学学报）》2009年第6期895-906,共12页Earth Science-Journal of China University of Geosciences

基　　金：中国地质调查局项目(No.1212010610103);国家自然科学基金项目(No.40672137);中国地质大学研究生学术创新与探索基金(No.CUGYJS0801)

摘　　要：通过总结和分析有关热年代学的资料,认为西昆仑及邻区的隆升存在明显的时空差异性.第一,隆升历史表现出明显的阶段性:晚渐新世到早中新世(25～16Ma)的部分隆升阶段、中新世中后期的快速隆升阶段(14～8Ma)和晚中新世以来的整体强烈隆升阶段(6Ma以来).第二,隆升在空间上显示出明显的差异性:塔什库尔干-公格尔山地区的隆升主要集中在9Ma以来,红其拉甫-库地地区的隆升主要集中在25～16Ma,康西瓦-普鲁地区的隆升则主要在9Ma以来(集中在9～2Ma)和25～12Ma.东西方向上表现为东西两端靠近构造结(喜玛拉雅西构造结和西昆仑-阿尔金构造结合部位)的地方较新(主要在9Ma以来),中间较老(主要在9Ma以前);南北方向上,西昆北地体在20Ma左右发生快速隆升,西昆南地体在9～5Ma发生快速隆升,而甜水海地体在5～2Ma发生快速隆升,由北向南总体上呈现出由老到新的空间差异性.Thermochronological data suggests that spatial-temporal differences of uplift obviously exist in West Kunlun and its adjacent area. Firstly, the uplift history falls into three distinct stages： The partial uplift stage from Late Oligocene to Early Miocene （25-16 Ma）, the rapid uplift stage during Middle Miocene （14-8 Ma） and the holistic and strong uplift stage since Late Miocene （after 6 Ma）. Secondly, the uplift of the study area shows obvious spatial differences. The uplift of Kongur-Tash Gurgan area mainly occurred after 9 Ma; the uplift of Hongqilapu-Kuda area mainly occurred during 25-16 Ma, and the uplift of Kangxiwar-Pulu area mainly occurred after 9 Ma （especially 9-2 Ma） and during 25-12 Ma. In the east/west direction, the uplift is earlier near the syntaxises （western Himalayan Syntaxis and West Kunlun-Altyn Syntaxis） than that in the middle area. Near the syntaxises the uplift mainly occurred after 9 Ma and yet in the middle area mainly before 9 Ma. In the south/ north direction, the rapid uplift of northern West Kunlun terrane roughly occurred at 20 Ma; the rapid uplift of southern West Kunlun terrane mainly occurred during 9-5 Ma; the rapid uplift of Tianshuihai terrane mainly occurred during 5-2 Ma. The rapid uplift of southern West Kunlun and its adjacent area is later than that in the north, and it varies from old to new.

关 键 词：西昆仑 新生代 磷灰石 热年代学 差异隆升 青藏高原. 

分 类 号：P542[天文地球—构造地质学]