Fluid Types and Activities of Emeishan Basalt in Zhougong Mountain-Hanwang Field of Sichuan Province
详细信息
- 责任者：Hou Mincai (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Wang Wenkai
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(8)
- 关键词：峨眉山玄武岩 ; Emeishan Basalt ; 四川 ; Sichuan Province
- 页码：p.2709-2718
- 图表：5 illus., 2 plates, 3 tables, 56 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Samples from Zhougong 2 well and Han 6 well in Zhougong mountain-Hanwang field show that the Emeishan basalt can be divided into 9 types,cryptocrystalline basalt,amygdaloidal basalt,tuff,volcanic breccia,tuff-breccia,epidosite rock,hematited-basalt,weathered basalt and vein rock. Minerals and with their combinations such as hematite,epidote,quartz-chlorite,opalhematite,magnetite-hematite,sphene-chalcedony,epidote-prehnite-chlorite,and ilmenite-chalcedony-chlorite-chalcedony are observed in amygdalas. There are 15 kinds veins in the Emeishan basalt such as: feldspar vein,hematite vein,quartz vein,epidote vein, chlorite vein,sphene vein,calcite vein,chalcedony-allophane vein,calcite-hematite vein,calcite-chlorite vein,quartz-calcite vein, quartz-epidosite vein,quartz-bituminous vein,hematite-chalcedony-chlorite vein and epidosite-chlorite-chalcedony vein. These veins and amygdalas were formed in different stages during the evolution of the Emeishan basalt. Fluid formed in the volcanic eruption stage was mainly influenced by the magmatic components rather than the atmospheric precipitation. It had mid-high temperature which is positively related to the salinity. The representative product is hematite vein. The fluid mainly originated from the meteoric water when weathering,and veins are strongly affected by oxidation and hydrolysis at the same time. The result shows lower-mid negative δ13C, with the low salinity and temperature,the allophane vein is of main feature. When it comes to the burial period,the rocks were transformed by the overlying strata water and deep brine. The fluid had lower-mid temperature with negatively relation to the salinity, and was controlled by the organic matter. The δ13C revealed a high negative value and epidosite vein is the most typical one.
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