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《Geological Journal of China Universities》 2014-03
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Reappraisal of the Origin of Lower Triassic Nodular Limestone in the Chaohu area,Lower Yangtze Region

JIN Xuebin;LI Zhuangfu;LU Lu;FENG Le;School of Resources and Earth Science, China University of Mining and Technology;Coalbed Methane Resources and Reservoir Formation Process, Key Laboratory of Ministry of Education,China University of Mining and Technology;  
The Lower Triassic deposited in deep-water environment in Chaohu area, in which nodular limestone was widely developed.Some previous genetic analysis of Lower Triassic nodular limestone had not come to consensus. Based on the method of fieldobservation, indoor macro, micro observation and the consideration of the relationship between sedimentation and diagenesis withinnodular limestone genesis, we made a comprehensive analysis of the nodular limestone genesis. The research results indicated thatnodular limestone was a product of both sedimentation and diagenesis. The periodic fluctuation of carbonate compensation depth(CCD)interface is the basis of the nodular limestone necking phenomenon occured in the sedimentary period, while the periodic fluctuation ofCCD interface was related to periodic change of climate and dissolution of bottom current in the Early Triassic. The dissolution of acidpore water was an important reason which causes the break of nodular limestone necking phenomenon. The disorder distribution ofnodular limestone was mainly caused by the local stress field resulting from pressolution. Three kinds of nodular limestone summarizedbefore, namely, banded nodular limestone, discontinuous nodular limestone and random nodular limestone, were formed by graduallyenhancement of sedimentation and diagenesis.
【Fund】: 中国煤炭地质总局广西煤炭地质局资源矿产调查开发项目(2012060013);; 中国矿业大学研究生实践与科研创新项目(GSF121101)
【CateGory Index】: P588.245
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