weight: normal">Discovery of Granulite Xenoliths from Xikeerweight: normal">，weight: normal">Tarimweight: normal">，weight: normal">Northwest China and Its Geological Implications
详细信息
- 责任者：Tian Wei (Key Laboratory of Orogenic Belts and Crustal Evolution ; MOE ; School of Earth and Space Sciences ; Peking University ; Beijing 100871 ; China) ; Wei Chunjing
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(2)
- 关键词：麻粒岩 ; granulite ; 捕虏体 ; xenoliths
- 页码：p.573-583
- 图表：8 illus., 5 tables, 37 refs.
- 分类号：0802
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The primary mineral assemblage of Xikeer granulite xenoliths is Cpx+Opx+Pl (An=30～50)+Sp+Ilm+Tim，and the secondary mineral assemblage is Ol+P1(An>50)+alkaline feldspar+glass．The temperature and pressure of the primary mineral assemblage are l 005～1 059 ℃ and 0.6～1.1 GPa．The secondary mineral assemblage is originated during isothermal decompression(ITD)，supra-solidus melting as well as fast cooling near the surface．These granulite xenoliths represent a previous mantle derived magma underplate at the low crust of the Tarim block．