Neo-Proterozoic Granitoid Magmatism in the Kuqe Depression of Northeastern Tarim Basin
详细信息
- 责任者：Luo Jinhai (State Key Laboratory of Continental Dynamics Department of Geology ; Northwest University ; Xi’an 710069 ; China) ; Che Zicheng
- 刊名：Acta Geologica Sinica
- 出版年：2011
- 卷期：85(4)
- 关键词：花岗岩 ; granite ; 岩浆活动 ; igneous activity ; 塔里木盆地 ; Tarim Basin
- 页码：p.467-474
- 图表：8 illus., 2 tables, 28 refs.
- 分类号：0801
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
Biotite adamellite intruding in the Proterozoic metamorphic basement of the eastern part of the Kuqe depression belongs to K-high calc-alkaline igneous rock.It is characterized by SiO2-rich, alkaline-rich, K-high, low-TiO2 and metaluminous rock with A/CNK=0.92~1.15. The adamellite is enriched in elements such as Rb, Th, K, Nd, Zr, Y and Tb, and depleted in elements such as Ba, U, Nb, Ta, Sr, P, Sm, and Ti, with distinct negative Eu anomaly (δEu=0.06~0.11). Geochemical features of the granitoid rocks reveal its derivation from partial melting of middle-lower crust. Zircon U-Pb LA-ICP-MS dating on the magmatic genetic zircon yields an age of (646.5±3.9) Ma, representing the emplacement age of the granites.