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Paleoenvironment reconstruction of the upper Paleozoic in the Linxing area, northeastern Ordos Basin, China

Li Yong, Wang Zhuangsen, Wu Peng and Meng Shangzhi
Paleoenvironment reconstruction of the upper Paleozoic in the Linxing area, northeastern Ordos Basin, China
AAPG Bulletin (December 2021) 105 (12): 2545-2574

Abstract

The interpretation of the depositional environment, provenance, and paleoclimate provides important information for understanding the formation and distribution of petroleum systems. The trace element and rare earth element (REE) concentrations and the heavy mineral distribution in upper Paleozoic sedimentary rocks in the Linxing area, northeastern Ordos Basin, were determined to reconstruct the paleoenvironment. The samples show clear light REE enrichment, although the degree of enrichment is generally poor. Redox proxies indicate that most of the samples were deposited in relatively dysoxic-oxic conditions. A warm and humid climate prevailed during deposition of the Benxi-Xiashihezi Formations, whereas extremely dry climate also occurred during Benxi Formation and Taiyuan Formation deposition. Shiqianfeng Formation deposition occurred in a completely dry climate. The increase in Sigma REE concentrations and the decrease in the Sr/Ba ratios above the Benxi Formation indicate a rapid increase in terrigenous clastic input and sea-level fall, which was related to Permian tectonic movement. Bivariate plot diagrams show mixed felsic-basic source influences for all the formations, with the Shanxi Formation displaying certain influences from acidic sources. From late Carboniferous to early Permian, the Daqingshan uplift was the primary provenance. Subsequently, the Yinshan paleocontinent became a more important factor in the main provenance as it was being continuously uplifted.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 105
Serial Issue: 12
Title: Paleoenvironment reconstruction of the upper Paleozoic in the Linxing area, northeastern Ordos Basin, China
Affiliation: China University of Mining and Technology, State Key Laboratory of Coal Resources and Safe Mining, Beijing, China
Pages: 2545-2574
Published: 202112
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
References: 75
Accession Number: 2021-066550
Categories: StratigraphyEconomic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., strat. cols., 3 tables, geol. sketch maps
N38°00'00" - N40°00'00", E110°00'00" - E112°00'00"
Secondary Affiliation: China United Coalbed Methane Company, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202147
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