Geochemical Characteristics and Genesis of Triassic Chagan Obo Alkaline Quartz Diorites in Inner Mongolia
详细信息
- 责任者：Zhang Wanyi (Key Laboratory of Orogenic Belts and Crustal Evolution ; Ministry of Education ; School of Earth and Space Sciences ; Peking University ; Beijing 100871 ; China) ; Nie Fengjun
- 刊名：Acta Petrologica Sinica
- 出版年：2012
- 卷期：28(2)
- 关键词：石英闪长岩 ; quartz diorite ; 内蒙古 ; Inner Mongolia
- 页码：p.525-534
- 图表：6 illus., 3 tables, 55 refs.
- 分类号：0801
- 出版序号：20130150
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Many Triassic alkaline granites have been discovered in southern Siberian plate margin in recent years, and these alkaline granites construct an alkaline granite belt. The Chagan Obo quartz diorite is an important intrusion in this alkaline granite belt. Its formation age was determined as 237 Ma using SHRIMP U-Pb method. The geochemical features suggest they belong to adackite-like lithological assemblage. The original magma of the quartz diorites was derived from partial melting of residual subducted oceanic slabs after collision between Siberia and China-Korean plates. This original magma was contaminated by ultramafic and K-enriched alkaline fluids. Therefore, these quartz diorites are synchronous products of Triassic alkaline granitoid magmatism in northern margin of Sino-Korean Plate.
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