| 中国南方宝塔组灰岩的岩石学特征及其对“龟裂纹”成因的指示——以贵州桐梓县红花园乡宝塔组灰岩为例 |
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| 关键词:Baota Formation “turtle crack” structure difference of components and structure weathering resistance |
| 基金项目:国家自然科学基金项目(编号: 41402101); 中国地质调查局地质调查项目“钦—杭结合带及临区深部地质调查”(编号: 121201104000160916) |
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| Petrology of Limestone of Baota Formation in South China and Its Indication to the Genesis of “Turtle Crack”: A Case Study of Baota Formation Limestone at Honghuayuan Township in Tongzi County, Guizhou Province |
| The Baota limestone is widely distributed in the Yangtze area, and is characterized by unique “turtle crack” structure, which is a good marker for regional stratigraphic correlation. However, the relationship between the morphology of the “turtle crack” and the internal composition and structure of the rock remains unclear. Field outcrops and directional section observations indicate that Baota Formation limestone could be divided into two components, namely “grayish black reticulate patterns” and “grayish white matrix”; on the cut plane perpendicular to the strata, distal distribution of both components is in disorder, and the “V” shape arrangement is not obvious; cut plane which is parallel to the strata shares the same reticular morphology as weathering surface. Using cathodoluminescence, fluorescence, SEM, TOC and hardness testing, the authors carried out a series of comparative analyses on the petrological characteristics of “grayish black” reticulate patterns and “grayish white matrix”. The results show that the former component is darker bioclastic limestone with lower hardness and higher content of organic matter, and asphalt veins can be seen under fluorescence; the latter component is lighter micrite with higher hardness and lower content of organic matter, and the fluorescence is not obvious. The difference in color and anti-weathering capability between two components is the internal cause for Baota Formation limestone forming “turtle crack” structure morphology on the ground. |
| ZHUO Xi-zhun,CHEN Xiao-shuai,ZHANG Lin-yan,CUI Jian-jun,XIONG Hui.2017.Petrology of Limestone of Baota Formation in South China and Its Indication to the Genesis of “Turtle Crack”: A Case Study of Baota Formation Limestone at Honghuayuan Township in Tongzi County, Guizhou Province[J].Acta Geoscientica Sinica,38(6):872-882. |
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