地质通报2018，Vol.37Issue(1)：26-38,13.
新疆准噶尔古生代洋盆闭合时限——来自卡拉麦里地区石炭纪碎屑锆石U-Pb年代学的约束
The closure time of Junggar Paleozoic oceanic basin:Evidence from Carboniferous de-trital zircon U-Pb geochronology in Kalamaili area
摘要
Abstract
The closure time of Junggar Paleozoic oceanic basin is significant for the reconstruction of Paleozoic tectonic framework and evolution of the Central Asian Orogenic Belt (CAOB). The Carboniferous coarse clastic rocks, which are widely distributed in the south of the Kalamaili fault belt,were formed in a fan-delta environment by sedimentary facies analysis.On the basis of regional stratigraphic correlation, rock association characteristics and stratigraphic contact relations, the authors redefined the coarse clastic rocks as the Shanlianglishi Formation.Two profiles of Shanlianglishi Formation from Dishuiquan and Shuangjingzi area,which were respectively located in the western and eastern section of Kalamaili fault belt,were chosen to correlate the stratigraphic sequence.U-Pb ages of detrital zircons from two coarse sandstone samples on the bottom of Shanlianglishi Formation were measured using the LA-ICP-MS method.The ages of the youngest zircons,349±4Ma and 355±3Ma,indicate that the sedimentary age of Shanlianglishi Formation were later than 349Ma,and it might have been formed in the early Early Carboniferous.The ages of detrital zircons and the gravel composition show that the provenance of Shanlianglishi Formation was mainly derived from the Devonian volcanic rocks in the north of the Kalamaili fault belt.Integrating the previous data,the authors infer that the coarse clastic rocks formed in the fore-land basin were probably the sedimentary response to the uplifting orogenic process of the Kalamaili orogenic belt, and the closure time of Junggar Paleozoic oceanic basin is constrained before the Early Carboniferous.关键词
准噶尔古生代洋盆/闭合时限/卡拉麦里地区/山梁砾石组/粗碎屑岩Key words
Junggar Paleozoic oceanic basin/closure time/Kalamaili area/Shanlianglishi Formation/coarse clastic rocks分类
天文与地球科学引用本文复制引用
白建科,陈隽璐,唐卓,张越..新疆准噶尔古生代洋盆闭合时限——来自卡拉麦里地区石炭纪碎屑锆石U-Pb年代学的约束[J].地质通报,2018,37(1):26-38,13.基金项目
中国地质调查局项目《阿尔泰成矿带喀纳斯和东准地区地质矿产调查》(编号:DD20160006)和《新疆奇台黄羊山晶质石墨资源基地综合地质调查》(编号:DD20179608) （编号:DD20160006）
