Characteristics and Zircon SHRIMP U-Pb Dating of the Amduo <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:City w:st="on">Trachyte</st1:City>, <st1:country-region w:st="on">Tibet</st1:country-region>, <st1:country-region w:st="on"><st1:place w:st="on">China</st1:place></st1:country-region> <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

Characteristics and Zircon SHRIMP U-Pb Dating of the Amduo Trachyte, Tibet, China

详细信息

责任者：Bai Zhida (China University of Geosciences ; Beijing 100083 ; China) ; Xu Debin
刊名：Geological Bulletin of China
出版年：2009
卷期：28(9)
关键词：粗面岩 ; trachyte ; 铀—铅计时 ; U-Pb dating ; 西藏 ; Tibet
页码：p.1229-1235
图表：6 illus., 4 tables, 16 refs.
分类号：0801
issnNo：ISSN1671-2552
isbnNo：CN11-4648/P

摘要

Amduo trachyte is located at the middle segment of the Bangonghu-Nujiang Suture, and adjacent to the northern side of the Amduo ophiolites. The outcrop area of the trachite is about 30 km², with accumulated thickness about 1 500 m. The features of trachyte show that it is continental volcanic rock with a relatively complete volcanic apparatus. The rock association which falls into shoshonite series includes latite, quartz latite, trachyte and some volcaniclastic rocks, but the trachyte is the major type. The characteristics of the petrochemistry, geochemistry and isotope-tracer measurement together suggest that the trachyte has relatively high pressure forming condition and belongs to potassic rocks fromed during post-orogenic process triggered by continental collision.

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