Petrogenesis of Cenozoic Basalts of Tianheyong,
- 责任者：Yang Zongfeng (State Key Laboratory of Geological Processes and Mineral Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Luo Zhaohua
- 刊名：Earth Science Frontiers
- 出版年：2009
- 卷期：16(2)
- 关键词：玄武岩 ; basalts ; 内蒙古 ; Inner Mongolia
- 页码：p.90-106
- 图表：13 illus., 3 tables, 69 refs.
- 分类号：0801
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
The Tianheyong basalts are basanites, which at least can be subdivided into three types of mineral assemblage. Trace elements ratio of Ba/Rb and variation of alkali metals might indicate the metasomatism of fluids. Petrogenesis simulation indicates that the Tianheyong primitive basaltic magma may have been the product of polybaric melting column with non-modal partial melting processes of enriched lherzolite, which straddle the boundary of garnet- and spinel-facies lherzolite. Magma may have been originated from low partial melting of source rocks. The comprehensive analysis indicates that the induced mechanism of source rock partial melting may have been the edge-driven convection, which resulted in the Tianheyong basalts having the deepest origin depth compared with that of eastern Jining and Hannuoba basalts.