Silurian Arc Volcanic Slices and Their Tectonic Implications in the Southwestern Tianshan UHPM Belt, NW China
详细信息
- 责任者：Pu Xiaofei (Key Laboratory of Orogenic Belts and Crustal Evolution ; MOE ; Department of Geology ; Peking University ; Beijing 100871 ; China) ; Song Shuguang
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(6)
- 关键词：超高压变质带 ; ultrahigh pressure metamorphic zones ; 岛弧 ; island arc ; 蓝片岩 ; blueschist ; 天山 ; Tianshan Mountains
- 页码：p.1675-1687
- 图表：9 illus., 2 tables, 44 refs.
- 分类号：0802
- 出版序号：848
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
A set of arc volcanic rocks was discovered in Habutengsu and Kepuerte in the eclogite-bearing ultrahigh-pressure metamorphic (UHPM) belt of the southwestern Tianshan Mountains, occurring as tectonic slices intercalated in the field. The zircon U-Pb dating by SHRIMP gives ages ranging from 420 Ma to 427 Ma as the earliest record as known for arc volcanics in southwestern Tianshan Mountains. These ages of the arc volcanic rocks suggest that the ancient South Tianshan Ocean began its subduction no later than 427 Ma.