Volcanic Rock Provenance of Zenong Group in Coqen Area of
- 责任者：Liu Wei (Chengdu Center ; China Geological Survey ; Chengdu 610081 ; China) ; Li Fenqi
- 刊名：Acta Petrologica et Mineralogica
- 出版年：2010
- 卷期：29(4)
- 关键词：火山岩 ; volcanic rocks ; 地幔源 ; mantle source ; 冈底斯山 ; Gangdise Range
- 页码：p.367-376
- 图表：11 illus., 1 table, 34 refs.
- 分类号：0801
- issnNo：ISSN1000-6524
- isbnNo：CN11-1966/P
The authors sampled and analyzed systematically felsic volcanic rocks of Zenong Group in Coqen area of Gangdise orogenic belt. The results show that magmatic rocks of Zenong Group are characterized by high SiO2 content, relative enrichment of LREE and evident enrichment of LILE, Rb, Ba, Th and U, depletion of such HFS elements as Nb and Ta, and the appearance of Sr negative anomalies, with isotopic features of high Sr (0.707 89～0.710 17) and low Nd(-3.4～-9.3). Based on previous research results and the latest 1∶250 000 regional geological survey, the authors hold that the felsic magmatic rocks of Zenong Group might be products of the dehydration and remelting of the crustal materials caused mainly by the heat of the mantle basic magma with the participation of some mantle materials.