摘要
为了解江苏南部地区碳酸盐岩地层的岩溶发育潜力,采集代表性岩石样品,并制作成统一规格的试片,开展一个水文年的溶蚀试验。结果表明,本地区碳酸盐岩的平均溶蚀速度约为1.42 mm·ka^(-1),与国内其它地区相比处于较低的水平,大致相当于西南地区的1/30,略高于北方岩溶区。实验证明了苏南地区二叠系、三叠系碳酸盐岩具有最强的溶蚀性,这为解释上述地层区的岩溶现象提供了地质依据。研究还表明,岩石的溶蚀性与Ca含量关系密切,同时也受岩石矿物成分、微构造影响,一般高Ca碳酸盐岩具有较高的溶蚀性。苏南地区的岩溶发育性以岩石溶蚀性为基础,但水动力条件也十分关键,宜兴地区二者兼备,岩溶最为发育。
The objective of this work was to understand the karst development potential of carbonate strata in southern Jiangsu,and provide quantitative data for relevant research.Some representative rock samples were collected and made into test specimens of uniform specifications,which were prepared to a hydrological year dissolution test.The results show that,(1)The average dissolution rate of the carbonate rock in this area is about 1.42 mm/ka,which is at a low level compared with other areas in China,roughly equivalent to 1/30 of that of southwestern China mainland and slightly higher than that of the karst areas in northern China.(2)The experiment proves that the Permian and Triassic carbonate rocks in southern Jiangsu Province have the strongest dissolution,which provides a geological basis for explaining the karst phenomenon in the above-mentioned stratigraphic zones.(3)The dissolution of rock is closely related to Ca content,which is affected by the mineral composition and micro-structure of the rock.Generally,high-Ca carbonate rock has high dissolubility.(4)Two key factors determining the development of karst are rock dissolution and hydrodynamic condition.The Yixing area meets both conditions,so karst developed well.
作者
武健强
顾春生
许书刚
赵秀峰
黄光明
WU Jianqiang;GU Chunsheng;XU Shugang;ZHAO Xiufeng;HUANG Guangming(Key Laboratory of Earth Fissures Geological Disaster,MNR,Nanjing,Jiangsu 210049,China;Geological Survey of Jiangsu Province,Nanjing,Jiangsu 210049,China)
出处
《中国岩溶》
CAS
CSCD
北大核心
2021年第4期565-571,共7页
Carsologica Sinica
关键词
碳酸盐岩
岩溶
溶蚀性
苏南地区
carbonate rock
karst
dissolubility
southern Jiangsu Province
