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Volume 41 Issue 5
Dec.  2022
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Article Navigation >  CARSOLOGICA SINICA  > 2022  >  41(5): 698-707
DENG Yulin, GUO Xulei, LUO Mingming, CHEN Xiangyong, KUANG Ye, ZHOU Hong. Study on the microstructure and variation law of carbonate rock dissolution based on scanning electron microscopy and CT imaging technology[J]. CARSOLOGICA SINICA, 2022, 41(5): 698-707. doi: 10.11932/karst20220503
Citation: DENG Yulin, GUO Xulei, LUO Mingming, CHEN Xiangyong, KUANG Ye, ZHOU Hong. Study on the microstructure and variation law of carbonate rock dissolution based on scanning electron microscopy and CT imaging technology[J]. CARSOLOGICA SINICA, 2022, 41(5): 698-707. doi: 10.11932/karst20220503
shu

Study on the microstructure and variation law of carbonate rock dissolution based on scanning electron microscopy and CT imaging technology

doi: 10.11932/karst20220503
  • 1.

    Institute of Geological Survey, China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China

  • 2.

    School of Environmental Studies, China University of Geosciences(Wuhan), Wuhan, Hubei 430074,China

  • Received Date: 2021-12-15
    Abstract
  • The dissolution of carbonate rocks is the most important process of karst development, and it is also the basis for the processes affecting karst geomorphological evolution, hydrochemistry of karst water, karst water system development, karst carbon sinks and global carbon cycle. Scholars have explored the dissolution mechanism of carbonate rocks and the factors that affect the development of carbonate karst through indoor simulated dissolution and in-situ experiments, but they mostly focus on the effect of chemical components of rocks on karst processes. In field surveys, it was found that not only limestone formations, but also some dolomite formations have developed karst. It is not comprehensive enough to explain the solubility of carbonate rocks only by chemical composition. The pore structure of the rock also plays an important role,but the influence mechanism of rock pore structure on karst development is still unclear. In order to study the variation law and control effect of carbonate rock pores under dissolution experiment,in this paper, we selects four types of carbonate rocks (Sinian Dengying Formation-medium fine-grained dolomite, Cambrian Tianheban Formation-oolitic limestone, fine-grained limestone, and Qinjiamiao Formation-dolomitic breccia)in the Three Gorges area to carry out dissolution experiments. At the same time, scanning electron microscopy and CT imaging methods were used to test and analyze the dissolution characteristics and pore structure of rocks before and after dissolution reaction. The results show that, (1)The dissolution of carbonate rocks always occurs in soluble minerals with low lattice energy and develops along the rhombohedral cleavage planes and weak parts of mineral crystals,showing the selective dissolution of soluble minerals and pore structures. Dissolution preferentially dissolves soluble minerals, and insoluble components either fall off or protrude from the rock surface.Due to the control of rhombic cleavage on the surface of dolomite crystals, the dissolution will develop into dissolution fractures along the cleavage, and at the same time, dissolution pores appear on the surface of dolomite crystals, showing a "honeycomb" dissolution characteristic; Lattice defects, cleavage, and the weaker plasmonic and molecular contact forces at the edge of the crystal are the places where the dissolution preferentially occurs, and the dissolution strength at the rock pores is slightly higher than that at other parts. (2) The pore size of carbonate rocks controls the development of dissolved pores and the evolution of dissolved pores during rock dissolution.For oolitic limestone and fine-grained limestone samples, because their pore diameters are mainly concentrated in 18-80 μm and the pore distribution is uniform,after the dissolution reaction, the small pores further increased, only a small amount of pores were enlarged by dissolution, and the area with increased pore size was mainly concentrated in 40-50 μm,and the pores were mostly developed on the surface of the rock. The pores on the surface of the medium-fine-grained dolomite are relatively developed and the pore size is large, about 20% of which are larger than 100 μm, after the dissolution transformation, the proportion of pores with a pore size of more than 50 μm in the rock increased to 78%. It is shown that the dissolution of rocks with small pore size (40-60 μm) mainly occurs on the surface of the sample, and small dissolved pores are often developed. The dissolution of large pore size (>80 μm) rocks mainly occurs in the pore walls and there are signs of dissolution into the rock. After dissolution transformation, the pore throat radius and connectivity of medium-fine-grained dolomite show a certain increase. (3) The dissolution process of carbonate rocks is jointly affected by chemical composition and pore structure, and is less affected by rock porosity. The pore size distribution is the key factor affecting the dissolution rate of carbonate rocks. The porosity of the samples before dissolution is between 1.97 and 10%. Under the experimental conditions (20 ℃, 1 atm, 0.1 mol·L−1 HCl solution), the dissolution rate of carbonate rocks is between 0.497 g·d−1 and 0.598 g·d−1. The mass loss of dolomitic breccia through dissolution is the largest due to the influence of cement shedding; the medium-fine crystal dolomite with more developed surface pores and larger pore size is second;fine-grained limestone with dense grains and small pores has the slowest dissolution rate.Samples with smaller pore diameters are greatly affected by the stagnant boundary layer, and the dissolution medium is likely to form a local saturation state inside the pores; the samples with larger pore diameters can expand into the rock during the dissolution process of the "water-rock" reaction, which is affected by the stagnant boundary, but the effect of the layer is less and the water flow conditions are better than the small pore size samples, so the dissolution rate is higher. This study has certain guiding significance for the understanding of the differential karstification mechanism and karst development law of carbonate rocks.

     

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