Evolution of Dolomite Crystal Textures in Feixianguan Formation of  the Northeast of Sichuan Basin, China

Abstract

Abstract:

Based on the nucleation and growth kinetics theory, the dolomite crystal can be classified according to crystal size distribution and crystal boundary shape. The evolution of the crystal texture is controlled by the chemical composition and textures of preexisting rock and dolomitic fluid. The preexisting rock can be classified into muddy limestone and muddy limestone with grains. The muddy limestone is classified as the one with uniform composition and the one with dissolved pore and cement. The muddy limestone with grains is classified as that with no alternation, with suffered corrosion and with cementation and micritization. The dolomite crystal textures in Feixianguan Formation of the NE Sichuan Basin can be cited to discuss the classification and evolution of dolomite crystal textures in dolomitic fluid with different concentration. The results show: (1)the corrosion and micritization in preexisting rock is the base of classification and evolution of dolomite crystal textures; (2)most of grains are replaced in dolomitic fluid with low concentration; (3)sucrosic dolomite is formed in foreign dolomitic fluid with high concentration.

Key words: dolomite crystal, texture evolution, dolomitic fluid, northeast of Sichuan Basin

CLC Number:

TE122.2

YANG Bo, CAI Zhong-Xian, ZHAO Wen-Guang. Evolution of Dolomite Crystal Textures in Feixianguan Formation of the Northeast of Sichuan Basin, China[J]. Geoscience, 2010, 24(5): 945-950.

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Evolution of Dolomite Crystal Textures in Feixianguan Formation of the Northeast of Sichuan Basin, China

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