Climatic-oceanic forcing on the organic accumulation across the shelf during the Early Cambrian (Age 2 through 3) in the mid-upper Yangtze Block, NE Guizhou, South China

Yeasmin, Rumana; Chen, Daizhao; Fu, Yong; Wang, Jianguo; Guo, Zenghui; Guo, Chuan

doi:10.1016/j.jseaes.2016.08.019

Cited by 80 publications

(64 citation statements)

References 112 publications

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“…It is noted that TOC values in euxinic waters are higher generally than in ferruginous waters, although it does not show obvious positive relationship between TOC values and Fe Py /Fe HR ratios, possibly because euxinic wedge existed normally in the edge of shelf to slope, where produced high primary productivity stimulated by upwelling [ Parrish , ; Cook , ; Piper and Link , ; Saltzman , ; Challands et al ., ; Yeasmin et al ., ]. That means upwelling will be the main factor controlling organic enrichment instead of redox, when anoxic degree has met the requirements of organic preservation.…”

Section: Discussionmentioning

confidence: 99%

“…LCOS with high TOC, widely distributed in Yangtze Platform across shelf to basin, are considered as shales deposited in anoxic-euxinic conditions during early Cambrian global transgression [e.g., Guo et al, 2007;Lehmann et al, 2007;Wille et al, 2008;Wang et al, 2012;Och et al, 2013;Pi et al, 2013]. It is a comprehensive result for organic-rich sediments from multiple factors e.g.,: (1) high primary productivity [Yeasmin et al, 2017], coincided with the great bioradiation of metazoans during early Cambrian [Brasier, 1992;Marshall, 2006], (2) high sea level and low sedimentation rate [Wang et al, 2013] due to a rapid transgression at the beginning of Cambrian [Fike et al, 2006;Babcock et al, 2015], (3) upwelling existed around slope [Xia et al, 2015;Yeasmin et al, 2017], (4) hydrothermal activity in local areas [Steiner et al, 2001;Chen et al, 2009;Li et al, 2015], (5) anoxic (and restrictive) sedimentary environment [Liang et al, 2009;Han et al, 2013;Tan et al, 2014;Wang et al, 2015a].…”

Section: Introductionmentioning

confidence: 99%

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Marine redox stratification during the early Cambrian (ca. 529‐509 Ma) and its control on the development of organic‐rich shales in Yangtze Platform

Zhang

Jiang

et al. 2017

Geochem Geophys Geosyst

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High resolution geochemical data from nine sections representing shelf to basinal environments in the Yangtze Platform were analyzed to reconstruct the marine redox environment during early Cambrian. Based on Fe species and Mo/TOC ratios, we have supplemented marine redox stratification during Stage 4 (late Canglangpuian‐Longwangmiaoan, ∼514‐509 Ma) on basis of the previously studied Stage 2‐Stage 3 (Meishucunian‐Qiongzhusian, ∼529‐514 Ma). A new proposed marine stratified redox model indicates that the middepth “euxinic wedge” developed at the base of slope during ∼514‐509 Ma in contrast to that the “euxinic wedge” prevailed at the shelf margin during ∼529‐514 Ma, even though these middepth euxinic waters both occurred between the oxic surface waters and ferruginous deep waters. This marine redox stratification resulted in high production and good preservation of organic matter during early Cambrian. TOC values in euxinic waters in the middle are generally higher than in ferruginous waters due to upwelling in slope. Therefore, the lower Cambrian organic‐rich shales in the Yangtze Platform are inferred to be deposited under the anoxic‐ferruginous and euxinic bottom waters with moderate‐strong restriction.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Marine redox stratification during the early Cambrian (ca. 529‐509 Ma) and its control on the development of organic‐rich shales in Yangtze Platform

Zhang

Jiang

et al. 2017

Geochem Geophys Geosyst

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“…Investigators have proposed different sedimentary environment modes of shale deposition [37][38][39][40]. Based on the analysis of sedimentary and geochemical characteristics, the sedimentary environment modes of oil shales of the Lower and the Upper Member of the Lucaogou Formation were found which can shed light on the differences between these two oil shales.…”

Section: Sedimentary Environment Modesmentioning

confidence: 99%

Sedimentary and Geochemical Characteristics of Oil Shale in the Permian Lucaogou Formation in the Southeastern Junggar Basin, Northwest China: Implications for Sedimentary Environments

Zhang¹,

Li²,

Yin³

2018

Oil Shale

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In this study, the sedimentary and geochemical characteristics of oil shale in the Lower and the Upper Member of the Permian Lucaogou Formation in the southeastern Junggar Basin, Northwest China, were investigated. Mineral and bulk chemical compositions, sedimentary facies and distribution of oil shale show that in the Lower Member it is rich in organic matter, but in the Upper Member, organic-poor. The distribution area of deep lake subfacies and oil shale in the Lower Member is larger than that in the Upper Member. The sedimentary modes of these two members were estimated using geochemical parameters, such as Sr/Cu, the chemical index of alteration (CIA), Ni/Co, V/Sc and (C 27 + C 28)/C 29 regular steranes. The organic-rich oil shale in the Lower Member of the Lucaogou Formation formed in the more humid climate and under oxidative conditions, its organic matter derived mainly from algae. On the other hand, the organic-poor oil shale in the formation's Upper Member formed in the humid climate and under more oxidative conditions, while the input of land plants to its organic matter was high and that of algae low.

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“…Normally, organic accumulation needs two main conditions: (1) favorable preservation, which means bottom water should be dysoxic anoxic (Jenkyns 2010;Sun et al 2016); (2) high primary productivity, which means abundant plankton living in surface water (Pedersen and Calvert 1990). During the early Cambrian, the Yangtze Platform was located between 30°and 60°north latitude in the subtropical dry zone controlled by subtropical highs, where broad equatorial current divergence developed in the oceanic bottom, transformed into eutrophic upwelling at the continental margin like SMUY (Xia et al 2015;Tang et al 2017;Yeasmin et al 2017). In consequence, the species and number of organisms in the early Cambrian increased rapidly in quartz-rich and clay-mineral-poor deep shelf-slope-basin environments, resulting in massive quantities of organic matter settling down and being buried, which is represented by high values from geochemical parameters of primary productivity (Mo bio , Ba bio and P) and the obvious positive relationship between these parameters and TOC.…”

Section: Main Factors Affecting Organic Accumulationmentioning

confidence: 99%

Controls on the organic carbon content of the lower Cambrian black shale in the southeastern margin of Upper Yangtze

Zhang

Jiang

et al. 2018

Pet. Sci.

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Control of various factors, including mineral components, primary productivity and redox level, on the total organic carbon (TOC) in the lower Cambrian black shale from southeastern margin of Upper Yangtze (Taozichong, Longbizui and Yanbei areas) is discussed in detail in this article. Mineral components in the study strata are dominated by quartz and clay minerals. Quartz in the Niutitang Formation is mainly of biogenic origin, and the content is in positive correlation with TOC, while the content of clay minerals is negatively correlated with TOC. Primary productivity, represented by the content of Mo bio (biogenic molybdenum), Ba bio (biogenic barium) and phosphorus, is positively correlated with TOC. The main alkanes in studied samples are nC 18-nC 25 , and odd-even priority values are closed to 1 (0.73-1.13), which suggest the organic matter source was marine plankton. Element content ratios of U/Th and Ni/Co and compound ratio Pr/Ph indicate dysoxic-anoxic bottom water, with weak positive relative with TOC. In total, three main points can be drawn to explain the relationship between data and the factors affecting organic accumulation: (1) quartz-rich and clay-mineral-poor deep shelf-slope-basin environment was favorable for living organisms; (2) high productivity provided the material foundation for organic generation; (3) the redox conditions impact slightly on the content of organic matter under high productivity and dysoxic-anoxic condition.

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Climatic-oceanic forcing on the organic accumulation across the shelf during the Early Cambrian (Age 2 through 3) in the mid-upper Yangtze Block, NE Guizhou, South China

Cited by 80 publications

References 112 publications

Marine redox stratification during the early Cambrian (ca. 529‐509 Ma) and its control on the development of organic‐rich shales in Yangtze Platform

Marine redox stratification during the early Cambrian (ca. 529‐509 Ma) and its control on the development of organic‐rich shales in Yangtze Platform

Sedimentary and Geochemical Characteristics of Oil Shale in the Permian Lucaogou Formation in the Southeastern Junggar Basin, Northwest China: Implications for Sedimentary Environments

Controls on the organic carbon content of the lower Cambrian black shale in the southeastern margin of Upper Yangtze

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