Controlling Factors of Pressure Dissolution of Cambrian Carbonate in the Northern Sichuan

doi:10.19657/j.geoscience.1000-8527.2022.099

Abstract

Abstract:

Previous studies of the stylolites prefer qualitative analysis, lacking quantitative analysis of mineral composition, textures, lithofacies and their impacts on stylolites (density and amplitude).The paper clarifies the quantitative relationship between the density and amplitude of stylolites, mineral composition, rock textures and lithofacies, and expounds the controlling factors of stylolite formation in the study area.Based on the database of outcrops, cores and thin sections, the stylolite characteristics, mineral composition, textures and lithofacies of Cambrian carbonate in the northern Sichuan Basin are quantitatively evaluated.The results by the observations of cores and microscope show that: (1) The terrigenous clastics in carbonates leads to the enhancement of rock heterogeneity, which facilitates the formation of stylolite with a content of 10%-15%; (2) The carbonates are strongly resistant to pressure solution, with a content of 50%-70% grains, 25%-30% cements, and no matrix; (3) Different lithofacies of one well could have different resistance to pressure dissolution.The density and amplitude of stylolites increase successively from granular dolostone, mixed siliciclastic-carbonate rocks, and crystalline dolostone through micrite dolostone in the same well, indicating that their resistance to pressure dissolution decreases gradually.

Key words: Sichuan Basin, Cambrian, carbonate, pressure dissolution, controlling factor

CLC Number:

P534.41

HU Liwen, ZOU Huayao, YANG Weiqiang, LI Ting, DENG Chengkun, CHENG Zhongzhen, ZHU Dancheng, CHEN Xingyue. Controlling Factors of Pressure Dissolution of Cambrian Carbonate in the Northern Sichuan[J]. Geoscience, 2023, 37(05): 1221-1231.

Figures/Tables 10

Fig.1 Location and stratigraphic column of the study area

Fig.2 Microscopic photos of Xiannüdong Fm, Longwangmiao Fm and Xixiangchi Fm in the northern Sichuan Basin

Fig.3 Cores and microscopic photos of stylolites of the Cambrian in the northern Sichuan Basin

Fig.4 Histograms of density and amplitude of stylolites versus terrigenous clastic content

Fig.5 Histograms of density and amplitude of stylolites versus dolomite content

Fig.6 Histograms of density and amplitude of stylolites versus calcite content

Fig.7 Histograms of density and amplitude of stylolites versus grain content

Fig.8 Histograms of density and amplitude of stylolites versus cement content

Fig.9 Histograms of density and amplitude of stylolites versus matrix content

Fig.10 Histograms of density and amplitude of stylolites versus lithofacies

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