Composition and formation environments of the Upper Jurassic–Lower Cretaceous black shale Bazhenov Formation (the central part of the West Siberian Basin)

Yuri, Zanin; Eder, V. G.; Замирайлова, А Г

doi:10.1016/j.marpetgeo.2007.07.009

Cited by 48 publications

(9 citation statements)

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“…Redox conditions of black‐shale formation were determined by analysis of some geochemical indicators. Several trace elements are known to be enriched in anoxic sediments, such as U, Ni, Zn, Mo, Cu, Co, V and Cr (Calvert and Pedersen, ; Arthur and Sageman, ; Gavshin and Zakharov, ; Yuri et al ., ; Hetzel et al ., ; Cao et al ., ). As shown in Figure , the early Jurassic black‐shale samples from the Qiangtang Basin are enriched in Ni, Zn, Cu, V and Cr in comparison with UC, whereas U and Mo exhibit a slightly lower content than their UC values.…”

Section: Discussionmentioning

confidence: 99%

“…Manganese in oxide form is an indicator of oxic conditions, manganese in carbonate form is an indicator of dysoxic conditions and it is not enriched in reduced conditions (Yuri et al, 2008). Manganese contents in the early Jurassic black-shale samples from the Qiangtang Basin show a high variability between 302 and 1317 ppm, with an average of 732 ppm, approximately 1.2 times the UP value.…”

Section: Geochemical Constraints On the Palaeoredox Conditionsmentioning

confidence: 99%

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Elemental geochemistry of the early Jurassic black shales in the Qiangtang Basin, eastern Tethys: constraints for palaeoenvironment conditions

Wang

Chen

et al. 2015

Geological Journal

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The early Jurassic black shales are the most important source rocks in the Qiangtang Basin, Tibet. These black shales may provide a useful example for understanding the sedimentary conditions during the early Jurassic in the eastern Tethys. Thirty-two black-shale samples were collected from the Qiangtang Basin to reconstruct the depositional environments during the early Jurassic in the eastern Tethys. The palaeoclimate index Σ(Fe + Mn + Cr + Ni + V + Co)/Σ(Ca + Mg + Sr + Ba + K + Na) varies between 0.58 and 1.14, together with low Sr/Ba (0.20-0.60) and Sr/Cu (1.68-7.88) ratios, indicating a warm humid to semi-humid climatic condition during black-shale deposition. The early Jurassic black shales exhibit slight Ce anomalies (0.89-0.94) and Mn enrichment (EF = 1.2), suggesting a slightly oxic depositional environment. The conditions of the sedimentary water system during black-shale deposition were apparently brackish as evidenced by middle B/Ga (3.96-5.73) and Th/U (3.96-6.51) ratios.

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Section: Discussionmentioning

confidence: 99%

Section: Geochemical Constraints On the Palaeoredox Conditionsmentioning

confidence: 99%

Elemental geochemistry of the early Jurassic black shales in the Qiangtang Basin, eastern Tethys: constraints for palaeoenvironment conditions

Wang

Chen

et al. 2015

Geological Journal

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“…Some trace elements, such as U, Ni, Zn, Mo, Cu, Co, V and Cr, enrich in anoxic conditions (Arthur & Sageman, ; Yuri, Eder, & Zamirailova, ). It has been widely established that a trace element ratio of V/(V + Ni) can be used as an indicator for palaeoredox conditions (Jones & Manning, ; Rimmer, ).…”

Section: Discussionmentioning

confidence: 99%

Geochemistry of siltstones of the Early Cretaceous Laiyang Group in Taolin area, Shandong Province, Eastern China: Implications for provenance, source weathering, palaeo‐environment, and tectonic setting

Zhang

Zhou

et al. 2018

Geological Journal

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The depositional environment and tectonic setting of the newly identified Ri-Qing-Wei Basin are the focus of controversy. In order to solve these questions, the geochemical characteristics of siltstones from Laiyang Group in Taolin area are analysed in detail. The siltstones present similar contents of SiO 2 and Al 2 O 3 compared with upper continental crust (UCC) and post-Archean Australian Shale (PAAS) and are classified as wacke on chemical classification plot of clastic rocks. The trace elements are characterized by the depletion of transition elements (Sc, V, Cr, Ni, and Cu). The chondrite-normalized REE patterns exhibit the enrichment of LREE and depletion of HREE, as well as significant negative Eu anomalies. Relative high Index of Compositional Variability (ICV) values suggest the siltstones are compositionally immature and the sediments of first-cycle. The low Chemical Index of Alteration (CIA) and Plagioclase Index of Alteration (PIA) values of the samples indicate the weak source weathering condition. Moreover, the characteristics of A-CN-K plot suggest K-metasomatism occurred after burial. A series of palaeo-environment indexes imply that the Laiyang Group were deposited in a reducing marine environment with hot and arid climate. Major-and trace-based tectonic setting discriminant diagrams all indicate that the Ri-Qing-Wei Basin was formed in an active continental margin setting; this conclusion is also supported by the analysis of the coeval igneous rocks. Based on the investigations of the subduction of the Palaeo-Pacific plate and the development of Cretaceous basins on the eastern Eurasia, we propose that Ri-Qing-Wei Basin was formed in response to the delamination of the North China Craton and the subduction of Izanagi plate.

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“…In contrast, the Sr is assumed to migrate Redox condition. Several trace elements, such as U, Ni, V, Mo, Cr, Co, are commonly enriched in anoxic sediments because of their solubility is controlled by the redox [34][35][36][37] . In the study of late Jurassic redox environment in northwest Europe, Jones et al 38 concluded that the values of Ni/Co, V/Cr and V/(V + Ni) were very reliable by comparing many parameters, and thus summarized a set of trace indexes for judging the redox environment ( Provenance.…”

Section: Methodsmentioning

confidence: 99%

Geochemical Characteristics of the Late Cretaceous Lower Zhoutian Formation in the Jitai Basin, Southeast China: Implications for palaeoenvironment and provenance

Yan

Wang

Mischke

et al. 2021

Preprint

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Major, trace and rare earth element geochemistry of the late Cretaceous lower Zhoutian Formation from the Jitai Basin of Southeast China were measured by inductively coupled plasma mass spectromentry (ICP-MS) analysis. The paleoclimate, paleo-environment and provenance of lower Zhoutian Formation in the Jitai Basin are analyzed in detail with these data.According to the research, the range of Sr/Cu values is wide, which indicates the changeable palaeoclimate, the curves of FeO/MnO and Al2O3/MgO are negatively correlated with the Sr/Cu curves. These changes indicate that the palaeoclimate of the late Cretaceous lower Zhoutian Formation in the Jitai Basin was divided into two parts. The lower part experienced two cooling events; the upper part was dominated by warm humid climate.The changes of B/Ga and Sr/Ba curves are similar to Sr/Cu curves. According to these values, the salinity of the late Cretaceous lower Zhoutian Formation in the Jitai Basin was consistent with palaeoclimate. The salinity of lower part changed from salt water to fresh/brackish water. The upper part was mainly fresh/brackish water, and there were many changes from fresh/brackish water to salt water. The values of Ni/Co, V/Cr, V/(V + Ni) and Ce/Ce* are relatively stable, indicating a long-term oxidation environment. The diagrams of La-Th-Sc, Th-Sc-Zr/10, La/Th-Hf and sandstone-siltstone background function show that the provenance in lower Zhoutian Formation mainly is a mixture of upper crust felsic sediments and old components.

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Composition and formation environments of the Upper Jurassic–Lower Cretaceous black shale Bazhenov Formation (the central part of the West Siberian Basin)

Cited by 48 publications

References 20 publications

Elemental geochemistry of the early Jurassic black shales in the Qiangtang Basin, eastern Tethys: constraints for palaeoenvironment conditions

Elemental geochemistry of the early Jurassic black shales in the Qiangtang Basin, eastern Tethys: constraints for palaeoenvironment conditions

Geochemistry of siltstones of the Early Cretaceous Laiyang Group in Taolin area, Shandong Province, Eastern China: Implications for provenance, source weathering, palaeo‐environment, and tectonic setting

Geochemical Characteristics of the Late Cretaceous Lower Zhoutian Formation in the Jitai Basin, Southeast China: Implications for palaeoenvironment and provenance

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