| 徐州地区碳酸盐岩溶蚀特征及影响因素分析 |
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| 引用本文： | 武 鑫,王艺霖,黄敬军,潘欢迎,万军伟.徐州地区碳酸盐岩溶蚀特征及影响因素分析[J].地质科技通报,2019,38(3):120-126. |
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| 作者姓名： | 武 鑫 王艺霖 黄敬军 潘欢迎 万军伟 |
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| 作者单位： | 江苏省地质调查研究院国土资源部地裂缝地质灾害重点实验室;中国地质大学（武汉） |
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| 基金项目： | 省级地质勘查基金项目"徐连经济带西部环境地质调查"(苏财建[2014]278号;苏财建[2015]436号);中国地质调查局项目"徐州地区岩溶塌陷调查"(12120114022001) |
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| 摘 要： | 徐州地区碳酸盐岩主要赋存于震旦系、寒武系和奥陶系3个地层中。为研究徐州地区碳酸盐岩的溶蚀规律,于2条碳酸盐岩地层剖面上取样44件,在常温常压、相同CO_2浓度条件下开展了5,10,15,20,30 d的室内溶蚀试验。试验结果表明,矿物成分和化学成分是影响碳酸盐岩溶蚀的主要因素,比溶蚀度和比溶解度的总体变化趋势是白云岩<灰岩<膏溶岩,随CaO质量分数的变化呈现正相关关系,随MgO质量分数的变化略呈负相关关系。当酸不溶物质量分数小于30%时,有利于促进碳酸盐岩的溶蚀作用;当酸不溶物质量分数大于30%时,对碳酸盐岩的溶蚀有抑制作用。原生结构以及节理构造也通过改变碳酸盐岩与水的接触面积而影响溶蚀能力,溶蚀作用排序为泥晶>粉晶>细晶>粗晶。当岩石中发育断裂、节理和破碎带时,溶蚀作用首先沿这些脆弱带进行。综合各影响因素分析,徐州地区马家沟组、张夏组、赵圩组、九顶山组溶蚀能力最强;炒米店组、馒头组、张渠组、望山组、魏集组、贾园组溶蚀能力中等;三山子组、倪园组、昌平组溶蚀能力相对较弱。
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| 关 键 词： | 碳酸盐岩 溶蚀试验 比溶蚀度 比溶解度 影响因素 |
Dissolution Characteristics of Carbonate and Analysis of the Key Influence Factors in Xuzhou Region |
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| Wu Xin,Wang Yilin,Huang Jingjun,Pan Huanying,Wan Junwei.Dissolution Characteristics of Carbonate and Analysis of the Key Influence Factors in Xuzhou Region[J].Bulletin of Geological Science and Technology,2019,38(3):120-126. |
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| Authors: | Wu Xin Wang Yilin Huang Jingjun Pan Huanying Wan Junwei |
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| Affiliation: | (Key Laboratory of Earth Fissure and Geological Disaster of Ministry of Land and Resources,Geological Survey of Jiangsu Province,Nanjing 210049,China;China University of Geosciences(Wuhan), Wuhan430074,China) |
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| Abstract: | The carbonate in Xuzhou region is mainly stored in Sinian, Cambrian and Ordovician. To study the dissolution pattern of carbonate in the region, we took 44 samples from two stratigraphic profiles of carbonate, and conducted the dissolution experiments under the conditions of normal temperature and pressure, the same carbon dioxide concentrations and about 5,10,15,20,30 d of the dissolution time. The experiment results show that mineral composition and chemical composition are the major factors to affect dissolution indices, overall trend of specific corrosion and specific solubility is dolomitelimestonegypsum. This positively correlates with the content of CaO and negatively correlates with the content of MgO. Then we have found when the acid insolubles content is less than 30%, it is helpful to promote the dissolution of carbonate;and on the contrary, the dissolution of carbonate is inhibited. The experiments also reveals that the native structure and tectonic joints affect the dissolution by changing the contact area of carbonate and water, and the dissolution intensity is micriticpowder crystalfine graincoarse grain.When the fracture, joint and crushed zone are developed in the rock, the dissolution will begin along these fragile zone.Because of the different influence factors, the Majiagou Formation, Zhangxia Formation, Zhaowei Formation and Jiudingshan Formation are continuous limestones with strong karstification. The karstification is medium in Chaomidian Formation, Mantou Formation, Zhangqu Formation, Wangshan Formation, Weiji Formation,and Jiayuan Formation. The weak kastification is found in Sanshanzi Formation, Niyuan Formation and Changping Formation. |
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| Keywords: | carbonate dissolution experiment specific corrosion specific solubility influence factor |
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