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首页> 外文期刊>Carbonates And Evaporites >The dissolution mechanism and karst development of carbonate rocks in karst rocky desertification area of Zhenfeng-Guanling-Huajiang County, Guizhou, China
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The dissolution mechanism and karst development of carbonate rocks in karst rocky desertification area of Zhenfeng-Guanling-Huajiang County, Guizhou, China

机译：贵州镇峰 - 怀安县喀斯特岩石荒漠化区碳酸盐岩石岩石岩石岩

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摘要

The phenomenon of rocky desertification is obvious in karst plateau of Guizhou, China, and the distribution area of slight-medium-severe rocky desertification is very large in Zhenfeng-Guanling-Huajiang, Guizhou. To explore the cause of formation and development of rocky desertification in the region, the karst development mechanism and characteristics were studied by the method of indoor dissolution test and microscopic analysis. The results show that the dissolution and karst features of carbonate rocks are closely related to geological structure, hydrogeological conditions, and lithology. The dissolution rate is the most affected by the chemical composition and mineral composition, followed by the pore structure and the particle feature. The dissolution rate of carbonate is in positive proportion with the calcite content, while it decreases with increasing content of dolomite. In the same chemical composition, the rock with the finer grains has a faster surface dissolution rate. In addition, the erosion amount will change with the pore aperture and connectivity. Karst morphology is mainly affected by the microstructure and mineral assemblage characteristics of carbonate rocks. In this rocky desertification area, bare rock over a large area will be further eroded, which will form the stone bud, stone forest. At the same time, the hydrodynamic effect of groundwater will erode the rock deeply, and the depression, karst funnel, or deep valley will appear gradually.
机译：贵州贵州喀斯特高原的岩石荒漠化现象是显而易见的，贵州镇峰 - 桂陵 - 华江的轻微中型严重岩石荒漠化的分布区。为了探讨该地区岩石荒漠化的形成和发展的原因，通过室内溶出试验检验和微观分析方法研究了喀斯特发展机制和特征。结果表明，碳酸盐岩的溶出和岩溶特征与地质结构，水文地质条件和岩性密切相关。溶出速率是由化学成分和矿物组合物影响最大的，其次是孔结构和颗粒特征。碳酸酯的溶出速率与方解石含量正相比，随着白云岩含量的增加而降低。在相同的化学成分中，具有更精细晶粒的岩石具有更快的表面溶解速率。此外，侵蚀量会随着孔隙光圈和连接而变化。岩溶形态主要受碳酸盐岩的微观结构和矿物组合特性的影响。在这个岩石荒漠化地区，在大面积的裸露将进一步侵蚀，这将形成石头芽，石森林。同时，地下水的流体动力学效果深深侵蚀了岩石，抑郁，岩溶漏斗或深谷会逐渐出现。

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