Low temperature albitization in Caino-Mesozoic reservoir sandstones from North Tarim, and a discussion on the fluid origin
Low temperature albitization in Caino-Mesozoic reservoir sandstones from North Tarim, and a discussion on the fluid origin作者机构：Department of Earth Sciences Zhejiang University Hangzhou 310027 China Department of Earth Sciences Nanjing University Nanjing 210008 China
出 版 物：《Chinese Science Bulletin》 (Chin. Sci. Bull.)
年 卷 期：1999年第44卷第S2期
页 面：35-37页
学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程]
主 题：low temperature albitization sandstones fluid origin North Tarim.
摘 要：CAJNOZOIC and Mesozoic in North Tarim are predominantly a set of terrestrial detrital formations. In thereservoir sandstones in the area, albite is one of the widely developed authigenic mineral. Micro-structural evidence shows that diagenetic albite occurs as euhedral crystals in the pore, and replaces feldsparand other detritus along cleavage and micro-crack. EPMA analyzing found that some of the alteration product has a chemical composition between purealbite and the replaced detrital feldspar. For example, composition of replaced alkali feldspar is betweenmicrocline and albite, and content of altered plagioclase decreases continuously. This has been regardedas direct evidence for fluid replacement, for feldspar crystallized from solution or magma is usually withfixed chemical composition. Taking alkali feldspar as an example, although Kf and Ab forming completeisomorphous admixture in high temperature, they exsolved out as two relative pure phases while temperature decreases.
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