Major and trace elements in mid-Eocene lacustrine oil shales of the Fushun Basin, NE China: Concentration features and paleolimnological implications

Mid-Eocene tectonic subsidence of the pull-apart Fushun Basin, NE China accommodated an up to 300-m-thick oil shale succession within the lacustrine Jijuntun Formation (Lutetian). Based on sedimentary records and bulk element geochemistry, accumulation of this oil shale succession is modeled to eval...

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Published in:Marine and petroleum geology 2020-11, Vol.121, p.104610, Article 104610
Main Authors: Xu, Sheng-Chuan, Hu, Hua-Bin, Zhang, Pu, Wang, Qing-Chun, Kang, Jian, Miao, Qing
Format: Article
Language:English
Subjects:
Biogeochemical cycling
Ferromanganese
Molybdenum
Organic matter
Paleoredox
Sedimentary fill
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Summary:Mid-Eocene tectonic subsidence of the pull-apart Fushun Basin, NE China accommodated an up to 300-m-thick oil shale succession within the lacustrine Jijuntun Formation (Lutetian). Based on sedimentary records and bulk element geochemistry, accumulation of this oil shale succession is modeled to evaluate the principal controls on enrichment patterns of organic matter (OM) and trace metals in lacustrine organic facies. The Jijuntun Formation, consisting primarily of massive oil shale and interbedded siltstone and sandstone that grade rapidly upward into well-laminated oil shale, records an overall evolution from lacustrine–deltaic facies associations to profundal facies associations. Sedimentological characteristics of the oil shale succession display a gradual change of moderately overfilled to balanced-fill lake fill mode, consistent with the up-section drop in siliciclastic inputs reflected by detrital proxies like decreased Si/Al and K/Na ratios. Variations in the sedimentary fill states are accompanied by increasing hydrographic restriction of the Jijuntun paleo-lake, in agreement with low Mo/TOC (consistently
ISSN:0264-8172
1873-4073
DOI:10.1016/j.marpetgeo.2020.104610