SHRIMP Zircon Dating of Meta-Sedimentary Rock from the Qinling Group in the North of Xixia, North Qinling Orogenic Belt: Constraints on Complex Histories of Source Region and Timing of Deposition and Metamorphism
详细信息
- 责任者：Wan Yusheng (Beijing SHRIMP Center ; Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Liu Dunyi
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(4)
- 关键词：变沉积岩 ; metasedimentary rocks ; SHRIMP定年 ; SHRIMP dating ; 物源区 ; provenance ; 秦岭 ; Qinling Mountains
- 页码：p.1172-1178
- 图表：3 illus., 1 table, 16 refs.
- 分类号：0802
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
This paper carried out a geochronological research on zircons from a meta-sedimentary rock (biotite plagioclase gneiss) sample in the north of Xixia, a typical distribution area of the Qinling Group in the Qinling orogen belt. The zircons show complex core-rim structures in CL images. A total of forty-seven zircons have ages ranging from >3.0 Ga to ~400 Ma. Combined with early data, some conclusions can be drawn as follows: 1) the protolith of the meta-sedimentary rock of the Qinling Group was formed after Paleoproterozoic; 2) the zircon features show that the studied rock underwent metamorphism from upper amphibolite-granulite facies in early stage; and 3) the source region providing detritus for the Qinling sediments shows a long and complex evolution history, there might be Archean basement in Qinling and adjacent areas.