Geochemistry of the Eocene Jijuntun Formation oil shale in the Fushun Basin, northeast China: Implications for source-area weathering, provenance and tectonic setting

R, Liu; Liu, Zhaojun; Sun, Pingchang; Xu, Yinbo; Liu, Dongqing; Yang, Xiaohong; Zhang, Chao

doi:10.1016/j.chemer.2014.08.004

Cited by 37 publications

(36 citation statements)

References 25 publications

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“…13f and 13g) and cause deposition of the massive and non-laminated oil shales (Fig. 5c-5h) with substantial terrestrial minerals (Liu et al, 2015;Meng et al, 2012). The periodic influx of clastic sediments induced by high rainfall (Liu et al, 2009;Xu et al, 2012), partly documented as widespread silty lenses within the massive oil shales (Fig.…”

Section: Paleoclimate Control On Deposition Of Oil Shalesmentioning

confidence: 97%

Characterization of depositional conditions for lacustrine oil shales in the Eocene Jijuntun Formation, Fushun Basin, NE China

Liu

Zhang

et al. 2016

International Journal of Coal Geology

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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, freshwater 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

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Section: Paleoclimate Control On Deposition Of Oil Shalesmentioning

confidence: 97%

Characterization of depositional conditions for lacustrine oil shales in the Eocene Jijuntun Formation, Fushun Basin, NE China

Liu

Zhang

et al. 2016

International Journal of Coal Geology

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“…Usually, the chemical composition of clastic sedimentary rocks can provide useful information on the degree of chemical weathering in their place of origin (Liu et al, ). Therefore, Nesbitt and Young (, ) proposed the chemical index of alteration (CIA) to quantify the degree of chemical weathering.…”

Section: Resultsmentioning

confidence: 99%

“…Likewise, REEs and relevant parameters have been widely used as indicators to identify sources of sedimentary rocks (Liu et al, ; Ma et al, ). Generally, higher LREE/HREE ratios and low Eu anomaly reflect felsic source rocks, whereas lower LREE/HREE ratios and relatively high Eu anomaly mainly indicate mafic source rocks (Armstrong‐Altrin et al, ).…”

Section: Resultsmentioning

confidence: 99%

Geochemical characteristics of Early Cretaceous marine oil shale from the Changshe Mountain area in the northern Qiangtang Basin, Tibet: Implications for palaeoweathering, provenance, tectonic setting, and organic matter accumulation

et al. 2019

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The Early Cretaceous Shengli River–Changshe Mountain marine oil shale belt, located in the northern Qiangtang Basin, Tibet, is estimated to be the largest marine oil shale resource in China. However, its palaeoweathering, provenance, and tectonic setting during the depositional history have received little interest. In this paper, 19 outcrop marine oil shale samples from the ChangsheMountain (CSM) area were studied to investigate the provenance, palaeoclimate, palaeoweathering, and tectonic setting during the marine oil shale deposition. The total organic carbon and organic sulphur contents of the CSM oil shales range from 2.2% to 13.44% and 0.19% to 1.08%, respectively. The CSM oil shale samples contain abundant carbonate (e.g., calcite and dolomite), quartz, and clay minerals. The clay minerals of the CSM oil shale samples is dominated by illite and then by smectite. Other minerals, including haematite, apatite, pyrite, baryte, and celestite, were also identified by scanning electron microscope–energy‐dispersive X‐ray spectrometer. The total rare earth element (∑REE) contents of the oil shales range from 9.01 to 105.96 ppm (average 57.56 ppm), close to the average REE contents of U.S. coals. The REE contents in oil shale samples are mainly controlled by terrigenous input. The CSM oil shales show LREE‐enriched, HREE‐depleted, with the LREE/HREE ratios ranging from 5.12 to 10.18, negative Eu anomalies (0.56–0.84) and slightly negative Ce anomalies (0.87–1.05). The chemical index of alteration values of the CSM oil shales range from 67 to 76 (average 73), indicating a moderate chemical weathering condition. Sr/Cu and Rb/Sr ratios suggest the CSM oil shales were mainly deposited under a warm and humid climate regime. Sr/Ba ratios, ranging from 0.54 to 7.84, suggest a palaeoenvironment with fluctuant salinity. Major element, trace element, and REE relationships indicate that the CSM oil shales are mainly from the felsic and intermediate igneous rocks. The REE distribution patterns of the CSM oil shales are similar to the Late Triassic Nadi Kangri felsic volcanic rocks in the Qiangtang Basin, indicating that the CSM oil shale may be derived from the Late Triassic volcanic rocks and the oil shales were mainly formed in rift tectonic setting. Favourable preservation condition (e.g., warmer palaeoclimate, higher palaeosalinity, and dysoxic to anoxic water column environment) could be the main controlling factor for organic matter accumulation.

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“…What is worth mentioning is that both diagrams are robust against large chemical changes (gain or loss; Verma & Armstrong‐Altrin, ). Indeed, these new methods have been successfully used to infer the unknown tectonic settings and perform well in some studies (e.g., Armstrong‐Altrin & Machain‐Castillo, ; Liu et al, ; Zaid, ). The chemical data should be first recalculated to 100% on an anhydrous basis.…”

Section: Provenancementioning

confidence: 91%

“…Nevertheless, the paleotectonic settings (e.g., CIA, ACM, and collision) inferred from these discrimination diagrams appear to differ from the structural studies of sedimentary basin (viz., weak extensional setting; Liao et al, ; Sobel, ). This can be accounted since the overall sedimentary composition is controlled by parental rocks in the provenance area (Liu et al, ).…”

Section: Provenancementioning

confidence: 99%

Geochemical characteristics, depositional environment, and provenance attitude of the Middle Jurassic Yangye Formation lacustrine mudstones in Kashi Sag, south‐western Tarim Basin

Wang

Zhu

et al. 2019

Geological Journal

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Middle Jurassic mudstones from the Yangye Formation are widely exposed in the Kashi Sag and regarded as significant potential source rocks. Geochemical characteristics of mudstones in the Keziletao Depression have been analysed to decipher their source‐area weathering, provenance, tectonic setting, and depositional environment that have received significantly little attention. Mudstones are characterized by high Ca, U, Th, and REE contents when compared to those of PAAS. Their total REE abundances range from 155.2 to 234.2 ppm, with the enrichment of LREEs and distinct negative Eu anomalies, implying a principal felsic provenance. Various indicators (e.g., CIA, Th/Sc, ICV, and Rb/Sr) and A‐CN‐K ternary diagram suggest parental rocks experienced a moderate to intense chemical weathering degree and simple recycling and sorting. Furthermore, paleoenvironmental indexes (e.g., B, “S,” Sr/Ba, “C,” Sr/Cu, and V/(V + Ni)) indicate that they were likely deposited in a suboxic to anoxic freshwater setting, with semi‐arid to semi‐humid paleoclimatic conditions during the deposition of Yangye Formation. The geochemical data also demonstrate that the provenances were derived predominantly from the unroofing of felsic rocks with a minor intermediate supply. These parental rocks were commonly formed in the continental island arc, active continental margin, and/or collision tectonic settings. The results of this study, combined with published data, suggest the West Kunlun Orogen and thrusting zone to the west and south‐west of the basin were probably arrested to provide substantial detritus for sediments, stimulating a better understanding for the formation mechanism of the Yangye Formation sediments (especially for potential source rocks) in the Kashi Sag.

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Geochemistry of the Eocene Jijuntun Formation oil shale in the Fushun Basin, northeast China: Implications for source-area weathering, provenance and tectonic setting

Cited by 37 publications

References 25 publications

Characterization of depositional conditions for lacustrine oil shales in the Eocene Jijuntun Formation, Fushun Basin, NE China

Characterization of depositional conditions for lacustrine oil shales in the Eocene Jijuntun Formation, Fushun Basin, NE China

Geochemical characteristics of Early Cretaceous marine oil shale from the Changshe Mountain area in the northern Qiangtang Basin, Tibet: Implications for palaeoweathering, provenance, tectonic setting, and organic matter accumulation

Geochemical characteristics, depositional environment, and provenance attitude of the Middle Jurassic Yangye Formation lacustrine mudstones in Kashi Sag, south‐western Tarim Basin

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