Influence of Mercury Geochemistry and Volcanism on the Enrichment of Organic Matter near the Ordovician Silurian Transition in the Middle and Upper Yangtze

被引：3
|
作者：
Lu X. [1 ,2 ]
Shen J. [1 ]
Guo W. [1 ]
Feng Q. [1 ,2 ]
机构：
[1] State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan
[2] School of Earth Sciences, China University of Geosciences, Wuhan
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2021年 / 46卷 / 07期
关键词：
Anoxia; Biological barium; Black shale; Geochemistry; Mercury; Shale gas;
D O I：
10.3799/dqkx.2020.258
中图分类号：
学科分类号：
摘要：
In order to investigate the influence of volcanism on the enrichment mechanism of organic matter in black mudstone, we analysis mercury, total sulfur, total organic carbon and barium concentrations from core JY 143⁃5 in Wulong District, Chongqing, exploring the relationship between volcanisms and enrichments of organic matter near the Ordovician⁃Silurian transition (Wufeng Formation⁃Longmaxi Formation) in the middle and upper Yangtze region. The results show that the enrichment intervals of mercury (the bottom of Longmaxi Formation) corresponds to the high values of marine productivity (total organic carbon and biological barium). Furthermore, the thickness of volcanic ash in the upper Yangtze area has a strong relationship with the spatial distribution of total organic carbon content, which also support the hypotheses that volcanism is closely related to the enrichment of organic matter. Therefore, this study suggests that multiple and extensive volcanic eruptions were likely tobe the main cause of the enrichment of organic matter between Ordovician and Silurian in middle⁃upper Yangtze region. © 2021, Editorial Department of Earth Science. All right reserved.
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页码：2329 / 2340
页数：11
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共 60 条
  • [1] Bishop J. K. B., The Barite⁃Opal⁃Organic Carbon Association in Oceanic Particulate Matter, Nature, 332, 6162, pp. 341-343, (1988)
  • [2] Canfield D. E., Factors Influencing Organic Carbon Preservation in Marine Sediments, Chemical Geology, 114, 3, pp. 315-329, (1994)
  • [3] Chen X., Fan J.X., Zhang Y.D., Et al., Subdivision and Delineation of the Wufeng and Lungmachi Black Shales in the Subsurface Areas of the Yangtze Platform, Journal of Stratigraphy, 39, 4, pp. 351-359, (2015)
  • [4] Chen X., Rong J. Y., Li Y., Et al., Facies Patterns and Geography of the Yangtze Region, South China, through the Ordovician and Silurian Transition, Palaeogeography, Palaeoclimatology, Palaeoecology, 204, 3, pp. 353-372, (2004)
  • [5] Dickens G.R., Fewless T., Thomas E., Et al., Excess Barite Accumulation during the Paleocene⁃Eocene Thermal Maximum: Massive Input of Dissolved Barium from Seafloor Gas Hydrate Reservoirs, pp. 11-24, (2003)
  • [6] Dymond J., Suess E., Lyle M., Barium in Deep⁃Sea Sediment: A Geochemical Proxy for Paleoproductivity, Paleoceanography, 7, 2, pp. 163-181, (1992)
  • [7] Fan J.X., Melchin M.J., Chen X., Et al., Biostratigraphy and Geography of the Ordovician⁃Silurian Lungmachi Black Shales in South China, Science China Earth Science, 54, pp. 1854-1863, (2012)
  • [8] Froelich P. N., Klinkhammer G. P., Bender M. L., Et al., Early Oxidation of Organic Matter in Pelagic Sediments of the Eastern Equatorial Atlantic: Suboxic Diagenesis, Geochimicaet Cosmo Chimica Acta, 43, 7, pp. 1075-1090, (1979)
  • [9] Grasby S. E., Them T. R., Chen Z. H., Et al., Mercury as a Proxy for Volcanic Emissions in the Geologic Record, Earth⁃Science Reviews, 196, 16, (2019)
  • [10] Guo W., Feng Q.L., Maliha Z.K., Organic Matter Enrichment Mechanism of Black Shale in Wufeng⁃Longmaxi Formations: A Case Study from Jiaoye 143⁃5 Well at Chongqing, Earth Science, 46, 2, pp. 572-582, (2021)
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