| Citation: | Bai Yang, Xie Hong, Wang Mengzhai, Lu Zhenghao. Enrichment mechanism of organic matter in black rock series of the Niutitang Formation in Bahuang, Tongren, Guizhou[J]. Bulletin of Geological Science and Technology, 2023, 42(5): 115-127. doi: 10.19509/j.cnki.dzkq.2022.0128
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A set of black rock series rich in organic matter developed in the Yangtze Plate of China in the Early Cambrian.
To explore the main controlling factors affecting the enrichment of organic matter, the samples of the Niutitang Formation in Bahuang, Tongren Guizhou Province were tested for total organic carbon (TOC), major, trace and rare earth elements.
The results show that the organic carbon content of the black rock series show a trend of high→low→high from bottom→lower middle→upper. The redox indexes Ni/Co, V/Cr, V/(V+Ni) and U/Th and the index Mo/TOC for determining the retention degree of water in the basin indicate that the carbonaceous shale and polymetallic element shale rich in organic matter at the bottom and upper part of the Niutitang Formation are formed in oxygen-poor to anoxic, medium to strong limited retention environments. The lower middle phosphate rock layer is formed in oxygen-poor to oxygen-rich, medium retention sedimentary environment. The
The key factor restricting the enrichment of organic matter in the black rock series of the Niutitang Formation is the generally reducing and retained sedimentary environment, and the medium-high paleoproductivity is an important basis for the enrichment of organic matter. Hydrothermal activity creates favorable conditions for the enrichment of organic matter in local strata (polymetallic enrichment layer), and terrigenous clastic input has little impact on the enrichment of organic matter. The rise in sea level is an unfavorable factor for the enrichment of organic matter. It is the "comprehensive model" under the joint action of multiple factors that control the enrichment of organic matter in the black rock series of the Niutitang Formation.
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