The Microcosmic Traces of Mantle Fluid and the Implications for Liquation Metallogenesis from Ultrabasic-Basic Xenoliths in Emeishan Basalt, Zhongdian, Yunnan Province
详细信息
- 责任者：Yi Liwen (College of Earth Sciences ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Liu Xianfan
- 刊名：Geoscience
- 出版年：2012
- 卷期：26(3)
- 关键词：玄武岩 ; basalts ; 流体包裹体 ; fluid inclusions ; 云南 ; Yunnan Province
- 页码：p.421-432
- 图表：6 illus., 3 tables, 33 refs.
- 分类号：0801
- issnNo：ISSN1000-8527
- isbnNo：CN11-1856/P
摘要
Based on the research of mineralogy and petrology using EMPA, SEM and Energy Spectra, the authors found a kind of Black Opaque Material (BOM) which is composed of microcrystalline silicate and spinel group minerals from ultrabasic-basic xenoliths in Emeishan basalt. From the crystal chemistry and element geochemistry of these microcrystalline minerals, the authors draw that they are the products and relics of mantle fluid which is not immixed with the host magma. During the evolution of the mantle fluid, differentiation by liquation is expressed as silicate→spinel→magnetite→chromite→ilmenite. The mantle fluid can also lead to the alternation and mineralization for host rocks and xenoliths, composing to be an important dynamic and substance source, while the mantle plume in the western Yunnan Province is favorable to the endogenous metal mineralization after Permian.