Lithogeochemistry and Formation of Mafic-Ultramafic Rocks from Yuanbaoshan Area of Northern Guangxi
详细信息
- 责任者：Han Zongzhu (College of Marine Geoscience ; Ocean University of China ; Qingdao 266100 ; China) ; Yi Weihong
- 刊名：Periodical of Ocean University of China
- 出版年：2011
- 卷期：41(9)
- 关键词：镁铁质岩 ; mafic rocks ; 超镁铁质岩 ; ultramafics ; 广西 ; Guangxi
- 页码：p.71-76
- 图表：2 illus., 3 tables, 16 refs.
- 分类号：0801
- 出版序号：1639
- issnNo：1672-5174
- isbnNo：37-1414/P
摘要
///The mafic-ultramafic rocks from northern Guangxi have been dominantly classified as calc-alkaline and tholeiite series. The content of SiO2 and MgO change a wider range. The mafic-ultramafic rocks show steep right-dipping and the depletion of Sr and Hf in primitively mantle normalized patterns. The REE distribution patterns of the rocks also show steep right-dipping and positive Yb anomaly. These show features of island arc volcanic. The rock tectonic environment is analysed. The results show that it is not a single factor. The petrogenesis may be caused by a small median ridge closed and it may be the products of plates convergence rather than derived from mantle plume.