LA-ICP-MS U-Pb Detrital Zircon Geochronology of Alumina-Rich Gneiss of the Helanshan Complex-Group in the Northern Segment of Helanshan Mountains and Regional Comparison
详细信息
- 责任者：Xiao Peixi (Xi’an Institute of Geology and Mineral Resource ; China Geological Survey ; Xi’an 710054 ; China) ; You Weifeng
- 刊名：Geological Bulletin of China
- 出版年：2011
- 卷期：30(1)
- 关键词：片麻岩 ; gneisses ; 铀—铅计时 ; U-Pb dating ; 贺兰山 ; Helan Mountains
- 页码：p.26-36
- 图表：5 illus., 4 tables, 13 refs.
- 分类号：0802
- 出版序号：20120192
- issnNo：ISSN1671-2552
- isbnNo：CN11-4648/P
摘要
The Helanshan Group exposed in the northern segment of Helan Mountains is high-grade metamorphosed rocks which are mainly composed of grey-biotite-sillimanite-cordierite-monzonitic-gneiss, sillimanite-garnet-biotite-plagioclase-gneiss, garnet-biotite-plagioclase-leptynite, sillimanite-garnet-monzonitic-leptite, sillimanite-biotite-plagioclase-leptynite, graphite-marble and hypersthene-plagioclase-gneiss. Based on distributing age range of detrital zircons of the Helanshan Group, the authors suggest that the khondalite series of the Helanshan Group formed in Paleoproterzoic, less to the effect of later period tectonic-thermal events of North China.