Early Ordovician Island Arc of Qimantag Mountain , Eastern Kunlun : Evidences from Geochemistry, Sm-Nd Isotope and Geochronology of Intermediate-Basic Igneous Rocks
详细信息
- 责任者：Cui Meihui (State Key Laboratory of Continental Tectonics and Dynamics ; Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Meng Fancong
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(11)
- 关键词：火成岩 ; igneous rocks ; 岩石地球化学 ; lithogeochemistry ; 钐同位素 ; samarium isotopes ; 钕同位素 ; neodymium isotopes ; 昆仑山 ; Kunlun Mountains
- 页码：p.3365-3379
- 图表：10 illus., 3 tables, 69 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Intermediate-basic igneous rocks,including hornblende gabbros, basalts, diorites and andesites, were found in Qimantag Group of Yaziquan area, west of Qimantag Mountain. The characteristics show that these intermediate-basic igneous rocks formed in an island arc setting. Zircon U-Pb dating for a diorite sample yields ages of (480±3) Ma, representing the rock forming age. Indicating that the Qimantag oceanic basin already exist in Early Ordovician and began subducting then, leading to the formation of island arc igneous rocks in Yaziquan.
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