中国地质2019，Vol.46Issue(1)：155-177,23.DOI:10.12029/gc20190110
东昆仑东段下三叠统洪水川组砾岩源区研究:来自砾岩特征及锆石U-Pb年龄的证据
Conglomerate source and source area property of Lower Hongshuichuan Formation in the East Kunlun Mountains:Evidence from conglomerate characteristics and U-Pb dating
摘要
Abstract
The lower Hongshuichuan Formation is mainly distributed around Tuosuo River between Middle Kunlun orogen and South Kunlun orogen in eastern Kunlun Mountains. In this paper, the authors made a comparative study of the conglomerate of Lower Hongshuichuan Formation distributed in Baoriherie area and Kekesha area in components, psephicity and granularity of gravel. The results show that the main components of the gravel are limestone and metamorphic rock in Kekesha area. The main components of gravel in Baoriherie area are granite and metamorphic rock. LA-ICP-MS zircon U-Pb dating of granite yielded magmatic crystallization age of (464.9 ± 9.3) Ma (MSWD=2.9) from Baoriherie area. The characteristics of gravel show that the source of the Kekesha area is Halaguole Formation in Qingshuiquan area, whereas the source of the Baoriherie area is Caledonian magmatic rock. These data indicate that the source of Lower Hongshuichuan Formation is Caledonian magmatic rock rather than arc granite of late Hercynian-Indosinian period. Combined with previous data, the authors hold that the Buqingshan-A`nimaqing Ocean began the northward subduction in late Permian, and the Hongshuichuan Formation was a set of sedimentary products in the fore-arc basin. It is held that Buqingshan-A`nimaqing Ocean began its subduction in early Triassic.关键词
东昆仑东段/洪水川组/砾岩/锆石U-Pb年龄/布青山-阿尼玛卿古特提斯洋Key words
East Kunlun/Hongshuichuan Formation/conglomerate/Buqingshan-A'nimaqing Ocean分类
天文与地球科学引用本文复制引用
王兴,彭思钟,裴先治,李瑞保,刘成军,陈有炘,李佐臣,张玉,胡晨光,颜全治..东昆仑东段下三叠统洪水川组砾岩源区研究:来自砾岩特征及锆石U-Pb年龄的证据[J].中国地质,2019,46(1):155-177,23.基金项目
国家自然科学基金项目(41472191,41502191,41172186) （41472191,41502191,41172186）
中央高校基本科研业务费专项资金项目(CHD2011TD020,2013G1271091,2013G1271092) （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(中铝基金200801)联合资助 （中铝基金200801）
