Rare earth and major element geochemistry of Eocene fine-grained sediments in oil shale- and coal-bearing layers of the Meihe Basin, Northeast China

Bai, Yitong; Liu, Zhaojun; Sun, Pingchang; Liu, Rong; Hu, Xiao; Zhao, Hanqing; Xu, Yinbo

doi:10.1016/j.jseaes.2014.10.008

Cited by 131 publications

(98 citation statements)

References 43 publications

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“…The chemical index of alteration (CIA) can not only reflect the degree of weathering of sediments but also reflect the paleoclimate conditions (Feng et al, ; Young & Nesbitt, ). However, in view of later sedimentation changing ingredient of lutyte, before applying CIA, index of compositional variability (ICV) needs to be considered to judge whether substance in provenance exposure to sediment recycling or not (Bai et al, ). The expression is ICV = (Fe 2 O 3 + K 2 O + Na 2 O + CaO * + MgO + MnO + TiO 2 )/Al 2 O 3 .…”

Section: Resultsmentioning

confidence: 99%

“…When the value is 50–65, it reflects cold and dry climate during sedimentation with low chemical weathering. The values of 65–85 and 85–100 indicate warm and humid climate with moderate chemical weathering, and hot and humid climate with strong chemical weathering (Bai et al, ). Table shows that CIA values of 64% oil shale samples are above 65, indicating that the paleoclimate condition is dominated by warm and humid climate during oil shale deposition.…”

Section: Discussionmentioning

confidence: 99%

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Rare earth elements geochemistry characteristics and their geological implications of lacustrine oil shale from Chang 7 oil layer in southern Ordos Basin, China

Zhu

et al. 2017

Geological Journal

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Located in the middle‐western area of China, Ordos Basin is a large continental basin with vast petroleum resources. Oil shale of Chang 7 oil layer from Triassic Yanchang Formation represents the typical lacustrine oil shale in China. Oil shale samples were collected from Chang 7 oil layer to study the characteristics of elements geochemistry. The rare earth elements (REEs) concentration of oil shale samples varies from 138.51 to 206.36 μg/g with an average of 162.64 μg/g, close to the average REEs content of the North American shale Composite and slightly higher than the upper continental crust. The chondrite‐normalized and North American shale composite‐normalized REEs distribution patterns explain that oil shale samples, together with silty mudstone samples, may have been derived from a similar terrigenous source. The oil shale deposited mainly in early diagenetic stage B period and the paleoclimate condition was warm and humid with moderate chemical weathering. The whole sedimentary rate of oil shale was low. The source rocks of oil shale were mainly from the felsic rocks and deposited in the continental island arc tectonic setting. The total REE of oil shale samples show positive correlations with Al, Si, K, and ash yield concentration and negative correlations with oil yield, Fe, P, and total sulfur concentration, illustrating that REEs concentration in clay minerals is more than that in organic matter. In addition, the light REEs and heavy REEs are both present in clay minerals and controlled by land‐derived detritus.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Rare earth elements geochemistry characteristics and their geological implications of lacustrine oil shale from Chang 7 oil layer in southern Ordos Basin, China

Zhu

et al. 2017

Geological Journal

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“…Some elements (e.g., Fe, Mn, V, Cr, Co, Sr, Ba, CaO, Mg, B, Rb, and Ni) and their ratios are always useful in various studies to decipher the paleosalinity, climate, and redox conditions during the depositions of sedimentary rocks in basin (e.g., Adams, Haynes, & Walker, ; Bai et al, ; Cao, Guo, et al, ; Couch, ; Hu, Li, Li, Huang, & Ge, ; Moradi, Sari, & Akkaya, ; Peng, Wang, & Jiang, ; Tanaka et al, ; Walker, ； Wu, Zhao, & Deng, ).…”

Section: Discussionmentioning

confidence: 99%

“…However, most samples have considerably high “C” values of 0.4–0.8, which suggest a general semi‐arid to semi‐humid condition (Table ; Figure ). Furthermore, trace elements Sr, Cu, and Rb are considered to be sensitive to paleoclimate, and Sr/Cu and Rb/Sr ratios may provide useful clues to infer paleoclimatic changes (Bai et al, ; Jin & Zhang, ; Mao & Liu, ; Moradi et al, ). Low Rb/Sr and Sr/Cu ratios reflect a warm and humid condition.…”

Section: Discussionmentioning

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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“…In the last two decades, REEs have been widely used to study paleoenvironmental conditions and paleoclimatic changes (Bai et al, 2014;Ding et al, 2001;Domingo et al, 2011;Holser, 1997;Och et al, 2014;Yang et al, 2014) as well as sedimentary origin and tectonic settings (Chen et al, 2014;Cui et al, 2014). In addition, the distribution patterns of normalized-REE have received considerable attention in various geochemical studies due to their chemical properties of REEs.…”

Section: Introductionmentioning

confidence: 99%

The rare earth element geochemistry on surface sediments, shallow cores and lithological units of Lake Acıgöl basin, Denizli, Turkey

Budakoǧlu

Abdelnasser

Karaman

et al. 2015

Journal of Asian Earth Sciences

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Rare earth and major element geochemistry of Eocene fine-grained sediments in oil shale- and coal-bearing layers of the Meihe Basin, Northeast China

Cited by 131 publications

References 43 publications

Rare earth elements geochemistry characteristics and their geological implications of lacustrine oil shale from Chang 7 oil layer in southern Ordos Basin, China

Rare earth elements geochemistry characteristics and their geological implications of lacustrine oil shale from Chang 7 oil layer in southern Ordos Basin, China

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

The rare earth element geochemistry on surface sediments, shallow cores and lithological units of Lake Acıgöl basin, Denizli, Turkey

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