The occurrence, growth mechanism and distribution of authigenic chlorite in sandstone

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Authors:Tian Jianfeng; Chen Zhenlin; Fan Yuanfang; Li Pingping; Song Lijun
Author Affiliations:Primary:
Xi'an University of Petroleum, College of Oil & Gas Resources, Xi'an, China
Other:
China University of Geosciences, China
China University of Petroleum, China
Volume Title:Kuangwu Yanshi Diqiuhuaxue Tongbao Bulletin of Mineralogy, Petrology and Geochemistry
Source:Kuangwu Yanshi Diqiuhuaxue Tongbao = Bulletin of Mineralogy, Petrology and Geochemistry, 27(2), p.200-205. Publisher: Zhongguo Kuangwu Yanshi Diqiu Huaxue Xuehui, Guiyang, China. ISSN: 1007-2802
Publication Date:2008
Note:In Chinese with English summary. 16 refs.; illus., incl. 1 plate
Summary:Authigenic chlorite is present as four different occurrences in sandstone: grain coatings chlorite, pore-lining chlorite, pore filling chlorite and honeycomb chlorite. The formation of authigenic chlorite consists of the transformation of clay minerals, the dissolution and crystallization of iron-rich substance, and the infiltration of external fluid which enriches in Mg or Fe. The sequences of different authigenic chlorite forms follows: grain coatings chlorite-pore-lining chlorite-pore filling chlorite, and the timing of honeycomb chlorite growth is depended on the external fluid. The value of pH is relevant to the surface charge of chlorite, and influences the chlorite occurrence further. The distribution of chlorite is controlled by the composition and structure of sandstone, the origin of Mg and Fe, temperature and pore fluid. The distribution of grain coatings chlorite, pore-lining chlorite, pore filling chlorite and honeycomb chlorite are different which are mainly dominated by sedimentary environment, the distribution of Fe-rich lithic fragment and biotite, the structure of sandstone and the external fluid respectively.
Sections:Petrology
Subsections:Sedimentary petrology; Silicates
Mineral Groups:Sheet silicates
Subjects:Authigenic minerals; Chlorite; Chlorite group; Clastic rocks; Crystal growth; Distribution; Occurrence; Sandstone; Sedimentary rocks; Sheet silicates; Silicates
Abstract Numbers:08M/3785
Record ID:2012044180
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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