Geochemical Characteristics and LA-ICP-MS Zircon U-Pb Dating of Basic Dykes in the Xiaomiao Area, oft-com:office:smarttags" />
详细信息
- 责任者：Ren Junhu (State Key Laboratory of Continental Dynamics ; Geology Department ; Northwest University ; Xi’an 710069 ; China) ; Liu Yiqun
- 刊名：Journal of Jilin University
- 出版年：2010
- 卷期：40(4)
- 关键词：基性岩 ; basic rocks ; 铀—铅计时 ; U-Pb dating ; 昆仑山 ; Kunlun Mountains
- 页码：p.859-868
- 图表：7 illus., 3 tables, 34 refs.
- 分类号：0801
- issnNo：ISSN1671-5888
- isbnNo：CN22-1343/P
摘要
The basic dykes in Xiaomiao area of Eastern Kunlun intrude into Jinshuikou group. Their geochemistry is characterized by low contents of TiO2, MgO, P2O5 and Na2O>K2O. Geochemical features of basic dykes indicate that the magma was influenced by the crustal source and related to continental extensional zone (incipient rift). LA-ICP-MS zircon U-Pb dating indicates that the age of (1 996～2 428) Ma represents the ages of captured zircon, which formed in regional tectonic thermal event during Archean to Palaeoproterozoic period. The age of (733.6±6.6) Ma (MSWD=0.038) may be the crystallized age of the basic dykes, which can be listed as the age of the Rodinia continent spliting. The basic dykes formed in continental rift environment of the Eastern Kunlun.