Discussions on classification scheme for fine-grained sedimentary rocks based on sediments sources and genesis
CAO Yingchang1,2, LIANG Chao1,2, HAN Yu2, XI Kelai1,2, WANG Junran2, JI Shichao2, MEI Junfang2
1 State Key Laboratory of Deep Oil and Gas(China University of Petroleum(East China)),Shandong Qingdao 266580,China; 2 School of Geosciences,China University of Petroleum(East China),Shandong Qingdao 266580,China
Abstract：The classification of fine-grained sedimentary rocks is crucial for the deep and systematical study of the fine-grained sedimentary rocks. The classification scheme not only has to reflect the sources,sedimentation types of rock components,it also should be widely applicable. There are various sources of fine-grained sedimentary rocks, including terrigenous clastic sources, endogenic chemical precipitation sources, biological sources and volcanic clastic sources. Among different basins,there are significant differences in the sediment source of fine-grained sedimentary rocks;furthermore,in the same basin,the same mineral can also has multiple sources. Currently,there is no systematic classification scheme for fine-grained sedimentary rocks,a special type of rocks. Based on the components, sediment sources and sedimentation types,we propose a comprehensive four-component three-terminal classification scheme for fine-grained sedimentary rocks. Firstly,the sediment source is considered as the first principle,and three end-members, i.e.,terrestrial clastic substances,endogenic chemical precipitants,and volcanic clastic substances,are used to classify them into four types(terrigenous clastic fine-grained sedimentary rocks,chemical fine-grained sedimentary rocks,pyroclastic fine-grained sedimentary rocks,and mixed fine-grained sedimentary rocks), and according to the content of organic matter, the fine-grained sedimentary rocks can be further divided into three categories: high organic matter, medium organic matter and low organic matter. Secondly, fine-grained sedimentary rocks are divided into 11 subtypes following the three-level naming principle, combined naming principle and compound naming principle. Thus, fine-grained sedimentary rocks could be named according to the relative content of the components.
CAO Yingchang,LIANG Chao,HAN Yu et al. Discussions on classification scheme for fine-grained sedimentary rocks based on sediments sources and genesis[J]. JOPC, 2023, 25(4): 729-741.
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