The Geochronology and Geochemistry of Intrusive Rocks in Bange Area: Constraints on the Evolution Time of the amespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />ace w:st="on">aceName w:st="on">BangongaceName> aceName w:st="on">Lake-NujiangaceName> aceType w:st="on">OceanaceType> aceType w:st="on">BasinaceType>ace>

详细信息   

• 责任者：Gao Shunbao (Faculty of Earth Resources ; China University of Geosciences ; Wuhan 430074 ; China) ; Zheng Youye
• 刊名：Acta Petrologica Sinica
• 出版年：2011
• 卷期：27(7)
• 关键词：侵入体 ; intrusions ; 岩石地球化学 ; lithogeochemistry ; 铀—铅计时 ; U-Pb dating ; 西藏 ; Tibet
• 页码：p.1973-1982
• 图表：5 illus., 2 tables, 21 refs.
• 分类号：0801
• 出版序号：172
• issnNo：ISSN1000-0569
• isbnNo：CN11-1922/P

摘要

 AN id=EnChDivSummary name="EnDivSummary">Field geological survey, U-Pb zircon chronology and rock geochemistry study shows that the intrusive rock of Bange region can be divided into four periods: early Early-Cretaceous quartz diorite and tonalite (138 Ma±), the middle Early-Cretaceous granodiorite (132~128 Ma), the middle-late Early-Cretaceous two-mica adamellite (130~114 Ma), Late-Cretaceous adamellite (80 Ma±). This result provides new information about the subduction polarity and evolution time of Bangong Lake-Nujiang ocean basin. The southward subduction of the Bangong Lake-Nujiang Ocean Basin is beginning before Middle Jurassic in Bange area, and it lasts to the middle Early-Cretaceous (130~125 Ma), and finally close in the middle Early-Cretaceous (125 Ma±).