Arid
DOI10.1016/j.coal.2016.09.004
Characterization of depositional conditions for lacustrine oil shales in the Eocene Jijuntun Formation, Fushun Basin, NE China
Xu, Sheng-Chuan1,2; Liu, Zhao-Jun2; Zhang, Pu1; Boak, Jeremy M.3; Liu, Rong2; Meng, Qing-Tao2
通讯作者Xu, Sheng-Chuan
来源期刊INTERNATIONAL JOURNAL OF COAL GEOLOGY
ISSN0166-5162
EISSN1872-7840
出版年2016
卷号167页码:10-30
英文摘要

The strike-slip Fushun Basin hosts a lacustrine oil shale interval of ca 50-300 m in the Eocene (Lutetian) Jijuntun Formation. The oil shale deposits consist of the lower lean oil shale unit (LOSU) and the upper rich oil shale unit (ROSU). In outcrop areas, the identified depositional cycles of ca. 8-10 m and 5-8 m in thickness record the stacking of massive and non-laminated oil shales in the LOSU and fine- and coarse-laminated oil shales in the ROSU, respectively.


Depositional conditions in the paleo-Jijuntun Lakes were synoptically reconstructed based on sedimentary features, trace element and organic geochemical proxies. Oxic to suboxic, fresh-water conditions were prevailing in the paleo-Jijuntun Lakes during deposition of the LOSU, and then evolved into oxygen-deficient, fresh- to mildly brackish-water conditions during deposition of the ROSU, as revealed by the concentrations of redox- and salinity-sensitive trace elements (e.g. V/Ni, V/Cr, Ni/Co and Sr/Ba ratios, and boron content) in the oil shales. Warm to cool and humid to arid climate (represented by e.g. Sr/Cu and Rb/Sr ratios) could result in the deepening of water column (from ca. 20-30 m to ca. 100 m) and saline stratification superposed on pre-existing thermal stratification in the paleo-Jijuntun Lakes. A systematical decrease (approximately one order of magnitude) in the concentrations of most trace elements (except for boron and Co) in the coaly oil shale in the lowermost LOSU, relative to those in the other oil shales in the Jijuntun Formation indicates the significant change of organic matter (OM) input from higher plant (especially coaly materials) to aquatic plankton. This is partly consistent with the variations of OM input from terrestrial higher plant and aquatic organisms (type II kerogen in the LOSU) to lacustrine algae (type I kerogen in the ROSU) as revealed by biomarkers. The slight to significant enrichment or depletion of few trace elements (i.e. Mn and Mo) in these immature to low-mature oil shale deposits may be associated with low to moderate productivities of aquatic plankton and/or incompletely oxygen-free conditions in the paleo-Jijuntun Lakes. (C) 2016 Elsevier B.V. All rights reserved.


英文关键词Oil shale Depositional condition Fushun Basin Trace element Organic geochemistry Jijuntun Lakes
类型Article
语种英语
国家Peoples R China ; USA
收录类别SCI-E
WOS记录号WOS:000389167200002
WOS关键词HYDROCARBON SOURCE ROCKS ; PRISTANE PHYTANE RATIO ; GREEN RIVER FORMATION ; CRUDE OILS ; ORGANIC GEOCHEMISTRY ; TRACE-ELEMENTS ; SEDIMENTARY-ROCKS ; CLIMATIC CONTROL ; NORTHEAST CHINA ; EASTERN CHINA
WOS类目Energy & Fuels ; Geosciences, Multidisciplinary
WOS研究方向Energy & Fuels ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/193717
作者单位1.Hebei GEO Univ, Coll Resources, Huaian East Rd 136, Shijiazhuang 050031, Peoples R China;
2.Jilin Univ, Coll Earth Sci, Changchun 130061, Peoples R China;
3.Colorado Sch Mines, COSTR, Golden, CO 80401 USA
推荐引用方式
GB/T 7714
Xu, Sheng-Chuan,Liu, Zhao-Jun,Zhang, Pu,et al. Characterization of depositional conditions for lacustrine oil shales in the Eocene Jijuntun Formation, Fushun Basin, NE China[J],2016,167:10-30.
APA Xu, Sheng-Chuan,Liu, Zhao-Jun,Zhang, Pu,Boak, Jeremy M.,Liu, Rong,&Meng, Qing-Tao.(2016).Characterization of depositional conditions for lacustrine oil shales in the Eocene Jijuntun Formation, Fushun Basin, NE China.INTERNATIONAL JOURNAL OF COAL GEOLOGY,167,10-30.
MLA Xu, Sheng-Chuan,et al."Characterization of depositional conditions for lacustrine oil shales in the Eocene Jijuntun Formation, Fushun Basin, NE China".INTERNATIONAL JOURNAL OF COAL GEOLOGY 167(2016):10-30.
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