羌塘盆地南部隆鄂尼地区布曲组鞍形白云石成因

doi:10.11743/ogg20160404

Abstract

Abstract: Saccharoidal dolostones in the Middle Jurrasic Buqu Formation of Longeni Area in southern Qiangtang Basin were found to contain large number of saddle dolomites.Petrographic study shows typical sweeping extinction,curved crystal faces and cleavage traces under cross polarized light and dark red luminescence and unzoned textures.Fluid inclusions in the saddle dolomite were measured to have homogenization temperature ranging between 152.8 and 174.1℃ and salinity averaged at 23.3%NaCl,much higher than the salinity of modern seawater,indicating a high temperature and high salinity diagenetic environment.In-situ isotopic analysis shows δ¹³C value ranging from -4.81‰ to 4.29‰,and δ¹⁸O value varying from -7.51‰ to -11.2‰.The δ¹⁸O(SMOW) value of diagentic fluid was calculated to be 5‰ -11‰ by using the fractionation equation of dolomite-fluid oxygen isotope.It is believed based on a comprehensive analysis that the saddle dolomites were formed in a relatively closed deep burial setting and were the products of thermal fluid modification.The saddle dolomites were probably formed in places where pores and fractures were well developed during a recirculation of heated formation water.The high salinity formation water could be the mixture of paleo-seawater during sedimentation period and underground hot brine during burial period.Origin of the saddle dolomite reveals that the saccharoidal dolostones with coarse grains are the result of recrystalization of surface or near surface dolostones.

Key words: carbon and oxygen isotope, burial dolomitization, saddle dolomite, Buqu Formation, Middle Jurassic, Qiangtang Basin

CLC Number:

TE121.3

Zhang Shuai, Xia Guoqing, Yi Haisheng, Cai Zhanhu, Li Qilai. Origin of saddle dolomites from the Buqu Formation of Longeni Area in southern Qiangtang Basin[J]. Oil & Gas Geology, 2016, 37(4): 483-489.

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Origin of saddle dolomites from the Buqu Formation of Longeni Area in southern Qiangtang Basin

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