The Geochemical Characteristics and Tectonic Setting of the Permian Basalts in the Binchuan-Lijiang Area in Yunnan Province
详细信息
- 责任者：Zhu Shifei (College of Mineral Resource and Earth Sciences ; CUMT ; Xuzhou 221008 ; China) ; Qin Yong
- 刊名：Journal of Mineralogy and Petrology
- 出版年：2008
- 卷期：28(1)
- 关键词：溢流玄武岩 ; flood basalts ; 云南 ; Yunnan Province
- 页码：p.64-71
- 图表：5 illus., 3 tables, 22 refs.
- 分类号：0801
- issnNo：ISSN1001-6872
- isbnNo：CN51-1143/TD
摘要
The trace and major elements of the Emeishan basalts occurred in the Binchuan and Lijiang area were studied. The basalts with a Permian age in the area were of the largest thickness of over 5000m and had a series of rock types. In this paper, the petrologic and geochemical characteristics and magma activation of the Emeishan basalts were described systemically. The research showed that the basalts with ω(SiO2) composition of 36. 72%～51. 44% can be compositionally subdivided into three types, the high-Mg (ωMgO=12. 3%～14. 3%) , the lowMg ( ωMgO=2. 48%～7. 53%) and transitional-Mg (ωMgO=10. 4%～11. 3%) basalt. It was considered that the Emeishan basalts represented a major magmatic event triggered by deep-seated plumes.