The Age Determination of the Middle Ordovician Qiashikansayi Intrusions in Altyn Mountains and Its Constraints on the Closure of Altyn Oceanic

详细信息   

• 责任者：Li Weidong (China University of Geosciences ; Beijing 100083 ; China) ; Zhang ji
• 刊名：Xinjiang Geology
• 出版年：2012
• 卷期：30(2)
• 关键词：正长花岗岩 ; syenogranite ; 阿尔金山 ; Altun Mountains
• 页码：p.141-145
• 图表：2 illus., 2 tables, 12 refs.
• 分类号：0801
• issnNo：ISSN1000-8845
• isbnNo：CN65-1092/P

摘要

The study area is located in the northern of Altyn Mountains, the age of the moyite that this paper studied had been previously classified into Precambrian intrusions. The author used Zircon SHRIMP U-Pb dating for it and yielded an age of (461.7±12.7)　Ma. The petrochemistry characteristics of the rock is high A1, K and be considered as collision granite. United regional geological characteristics advanced the close date of Altyn Early Paleozoic Oceanic Basin is Middle Ordovician.