摘要
恰什坎萨依侵入岩是阿尔金山北部重要碱性系列富铝正长花岗岩,前人认为是前寒武纪侵入岩。对其锆石进行SHRIMP定年,获得侵入岩形成年龄(461.7±12.7)Ma,岩石化学具富铝高钾特征,为板块对接、碰撞并伴随地壳缩短、加厚使陆壳重熔形成的同碰撞花岗岩。结合区域构造演化资料,认为该岩体年代学及地球化学特征限定阿尔金早古生代洋盆闭合时间为中晚奥陶世。
The study area is located in northern of Altyn mountains, the age of the moyite that this paper study had been previously classified into Precambrian intrusions.The author used Zircon SHRIMP U-Pb dating for it and yielded an age of 461.7±12.7Ma.The petrochemistry characteristics of the rock is high A1,K and be consider as collision granite.United regional geological characteristics,advanced the close date of Altyn early Paleozoic Oceanic Basin is middle Ordovician.
出处
《新疆地质》
CAS
CSCD
北大核心
2012年第2期141-145,共5页
Xinjiang Geology
