line-level: 2" class=MsoNormal>Zircon U-Pb Age and Petrochemical Characteristics of Shimian Granite in Western Sichuan: Petrogenesis and Tectonic Significance

• 责任者：Lin Guangchun (College of Earth Sciences and Resources ; Chang’an University ; Xi’an 710054 ; China)
• 刊名：Earth Science
• 出版年：2010
• 卷期：35(4)
• 关键词：花岗岩 ; granite ; 铀—铅计时 ; U-Pb dating ; 岩石地球化学 ; lithogeochemistry ; 四川 ; Sichuan Province
• 页码：p.611-620
• 图表：6 illus., 3 tables, 49 refs.
• 分类号：1001
• issnNo：ISSN1000-2383
• isbnNo：CN42-1233/P

Neoproterozoic magmatic rocks are widespread in western margin of the Yangtze block, and their genesis and tectonic setting have been an issue in hot debate at the present time. SHRIMP U-Pb zircon age, petrology, geochemical and Nd isotopic data are reported for the Neoproterozoic Shimian granite in the Kangdian rift of western Sichuan Province. This pluton is of metaluminous high-K calc-alkalic I-type granite and emplaced at (818±7) Ma. Petrology, geochemical and Nd isotopic characters suggest that the pluton was generated by partial melting of pre-existing, young (Late Mesoproterozoic to Early Neoproterozoic)island arc crust, with contamination of old crust materials during magma ascending and emplacement.