Geochemistry and Zircon U-Pb Age of the Paleoproterozoic Syn-Collisional Granites in Helan Mountains Region and Its Geological Significance
详细信息
- 责任者：Li Zhenghui (State Key Laboratory of Continental Dynamics ; Department of Geology ; Northwest University ; Xi’an 710069 ; China) ; Liu Xiaoming
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(7)
- 关键词：孔兹岩 ; khondalite ; S型花岗岩 ; S-type granite ; 岩石地球化学 ; lithogeochemistry ; 贺兰山 ; Helan Mountains
- 页码：p.2405-2415
- 图表：6 illus., 3 tables, 61 refs.
- 分类号：0802
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Helanshan khondalite series,located at the west part of North China craton,are widely intruded by granites. Most of the granites are S-type. The investigated Shabatai granites are characterized by high SiO 2 and Al 2 O 3 contents,71. 96% ～ 73. 87% and 14. 36% ～ 15. 10% ,respectively. The high A / CNK and A / NK values suggest that the granites are peraluminous. The chondrite- normalized REE patterns of the rocks show the enrichment of LREE ( ( La / Yb) N = 12 ～ 191) and strong negative Eu anomalies ( δEu = 0. 15 ～ 0. 32) . The primitive mantle-normalized trace element diagrams show the enrichment of Rb,Th,U and Pb and depletion of Ba,Nb,Ta,Sr and Ti. All above characteristics suggest that they are S-type granites and were probably generated by partial melting of the khondalite in the Helanshan region. The U-Pb dating of zircons from the granites using LA-ICP-MS yields an age of 1958 ± 30Ma, which represents the crystallization age of the S-type granite. According to the published geological data and our new data,it is reasonable to refer that these S-type granites were generated in a Paleoproterozoic collisional tectonic setting between the Yinshan and Ordos blocks.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |