Analysis of paleoclimatic cycles in the ultra thick coal seam of Yan'an Formation in the southern Ordos basin

Authors

DONG Guoqi, College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
WANG Dongdong, College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, ChinaFollow
LIU Haiyan, College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
MAO Qiang, College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
YIN Lusheng, College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China

Abstract

Coal is a climate-sensitive sediment that contains abundant paleoclimate information. In order to find out the paleoclimate information contained in the coal seam and the evolution of its controlling factors, the No.4 thick coal seam in the first member of Yan’an Formation in the south of Ordos basin was studied. Based on the intensive sampling of the thick coal seam, the information of organic macerals, major and trace elements, and stable carbon isotopes of organic matter were systematically tested. By using the macerals, characteristic elements and carbon isotopes of coal and rocks, four cycles of paleoclimate with alternation of warm-wet and dry-heat have been identified in the thick coal seam. The results of this study are similar to those of the previous studies in the same seam in the adjacent area, and the paleoclimatic cycle identified by the method of paleovegetation content coefficient was very consistent. Based on the comparative analysis of the Milankovitch cycle information which controlled the climate evolution in the thick coal seam, it is considered that the development and evolution of the paleoclimate cycle in the thick coal seam were mainly controlled by the long period of eccentricity in the orbit parameters of the celestial body. The results confirm the reliability of the method and elucidate the genetic mechanism of paleoclimate cycloaddition.

Keywords

ultra thick coal seam, paleoclimate cycle, Milankovitch cycle, controlling factor, eccentricity, Binchang mining area

DOI

10.3969/j.issn.1001-1986.2020.03.008

Recommended Citation

DONG Guoqi, WANG Dongdong, LIU Haiyan, et al. (2020) "Analysis of paleoclimatic cycles in the ultra thick coal seam of Yan'an Formation in the southern Ordos basin," Coal Geology & Exploration: Vol. 48: Iss. 3, Article 9.
DOI: 10.3969/j.issn.1001-1986.2020.03.008
Available at: https://cge.researchcommons.org/journal/vol48/iss3/9

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