SHRIMP U-Pb Dating, Geochemistry and Tectonic Implications of the Beiqigetao Gabbros in Urad Zhongqi Area, Inner Mongolia
详细信息
- 责任者：Zhao Lei (Key Laboratory of Orogenic Belts and Crustal Evolution ; MOE ; School of Earth and Space Sciences ; Peking University ; Beijing 100871 ; China) ; Wu Tairan
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(10)
- 关键词：辉长岩 ; gabbros ; 铀—铅计时 ; U-Pb dating ; 内蒙古 ; Inner Mongolia
- 页码：p.3071-3082
- 图表：6 illus., 3 tables, 53 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Two types of cumulate gabbros are exposed in Wengeng area, Urad Zhongqi, Inner Mongolia, including olive gabbro and amphibole gabbro. The major petrogenetic minerals in the Beiqigetao gabbros are olive, pyroxene, plagioclase and hornblend. The SHRIMP U-Pb dating from olive gabbro give a concordant age of (269±8) Ma. All the above evidences suggest that olive gabbro and amphibole gabbro were derived from the same mantle sources, which had undergone subduction-related metasomatism except inheriting the mantle source characteristics of the North China Block.