Zircon SHRIMP U-Pb geochronology and petrogenesis of the plagiogranites from the Lagkor Lake ophiolite,Gerze,Tibet,China

被引：0
|
作者：
ZHANG YuXiu1
2 Graduate University
3 Department of Earth Sciences
机构：
来源：
Science Bulletin | 2007年 / 05期
基金：
中国国家自然科学基金;
关键词：
Tibet; Gerze; plagiogranite; zircon; SHRIMP U-Pb geochronology;
D O I：
暂无
中图分类号：
P597.3 [];
学科分类号：
070902 ;
摘要：
Field relationship, along with petrographical, petrological, and geochemical characteristics, and zircon populations, indicates that the plagiogranites from the Lagkor Lake ophiolite in the Bangong-Nujiang suture zone (~ 20 km south of Gerze County, central Tibet, China), derived from anatexis of hydrated gabbros by ductile shearing during transport of the oceanic crust. Therefore, this kind of plagiogranite is coeval to or little later than the spreading of the oceanic crust. Zircon SHRIMP age of 166 ± 2.5 Ma for the plagiogranites indicates that an oceanic basin existed in the western part of the Bangong-Nujiang zone in the Middle Jurassic.
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收藏
页码：651 / 659
页数：9
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