地质学报2017，Vol.91Issue(6)：1326-1344,19.
东昆仑南缘哥日卓托地区马尔争组沉积物源分析:碎屑锆石U-Pb年代学证据
Sediment Source Analysis for the Maérzheng Formation Sandstone in Gerizhuotuo Area, Southern Margin of East Kunlun Region:Evidence for Detrital Zircon U-Pb Geochronology
摘要
Abstract
To study the sedimentary source and sedimentary tectonic setting of the lower Permian Maérzheng Formation in the southern margin of East Kunlun,detailed strata division,sedimentary environment and detrital zircon U-Pb geochronology were taken for the Lower Permian Maérzheng Formation in Gerizhuotuo area in the southern margin of East Kunlun in this paper.The results show that the Maérzheng Formation is a set of turbidite formed in bathyal-sea continental slope.Detrital zircon U-Pb age spectrum can be explicitly divided into Early Paleozoie and Neoproterozoic two main age spectrum and the Paleoproterozoic Mesoproterozoic secondary age spectrum.The main age spectra were 396～573 Ma and 727～947 Ma,the peak age was 421Ma and 862 Ma,respectively.The secondary age spectra were 1117～ 1993 Ma and 2319～3063 Ma,the peak age was not obvious.Combined with geological data in the study area and its adjacent area,it is considered that the sedimentary source of Maérzheng Formation in Gerizhuotuo area in the south margin of the East Kunlun is complex which shows characteristics of source supplied from multiple times,as Early Paleozoic,Neoproterozoic,Mesoproterozoic and Proterozoic.Early Paleozoic magmatic rocks and Neoproterozoic magmatic rocks in East Kunlun orogenic belt provide about 60～65 percent of sediment source and old metamorphic basement provides only about 30～35 percent of sedimentary debris for Maérzheng formation.Combined with previous data,we suggest that Maerzheng Formation formed in extensional system related to the passive continental margin tectonic setting,and the oceanic crust subducted from late Permian.关键词
东昆仑/布青山构造混杂岩带/马尔争组/碎屑锆石/沉积物源Key words
East Kunlun/Buqingshan tectonic melange zone/Maérzheng Formation/Detrital zircon/Sedimentary source引用本文复制引用
裴磊,胡楠,高峰,李瑞保,裴先治,刘俊来,李佐臣,刘成军,陈有炘,刘战庆,陈国超..东昆仑南缘哥日卓托地区马尔争组沉积物源分析:碎屑锆石U-Pb年代学证据[J].地质学报,2017,91(6):1326-1344,19.基金项目
本文为国家自然科学基金项目(编号:41472191、 41502191、41172186)、中央高校基本科研业务费专项资金项目(编号CHD2011TD020、2013G1271091、2013G1271092)、青海省国土资源厅—中国铝业公司公益性区域地质矿产调查基金项目(编号:中铝基金200801)联合资助成果. （编号:41472191、 41502191、41172186）
