Organic accumulation in the lower Chihsia Formation (Middle Permian) of South China: Constraints from pyrite morphology and multiple geochemical proxies

Wei, Hengye; Chen, Daizhao; Wang, Jianguo; Yu, Hao; Tucker, Maurice E.

doi:10.1016/j.palaeo.2012.07.005

Cited by 131 publications

(64 citation statements)

References 83 publications

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“…With regard to framboid size distributions (Figs. 14, 15), larger mean diameters (~N 6 μm) and wider variation of framboidal diameters (with maximum diameters~N 18 μm) suggest a diagenetic origin and dysoxic/oxic water-column conditions (Wilkin et al, 1996(Wilkin et al, , 1997Wilkin and Arthur, 2001;Wei et al, 2012b). Samples with smaller mean diameters (~b6 μm), narrower size distributions (standard Fig.…”

Section: Pyrite Framboid Size Distributionsmentioning

confidence: 96%

Episodic euxinia in the Changhsingian (late Permian) of South China: Evidence from framboidal pyrite and geochemical data

Wei

Algeo

et al. 2015

Sedimentary Geology

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Section: Pyrite Framboid Size Distributionsmentioning

confidence: 96%

Episodic euxinia in the Changhsingian (late Permian) of South China: Evidence from framboidal pyrite and geochemical data

Wei

Algeo

et al. 2015

Sedimentary Geology

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“…Although being decreased during burial process, TOC contents are commonly thought to be associated with the photosynthetic paleoproductivity [12,70]. Therefore, TOC contents can be regarded as a valid indicator for paleoproductivity when combined with other indicators, such as Ba.…”

Section: Paleoproductivitymentioning

confidence: 99%

Elemental Geochemical Evidence for Depositional Conditions and Organic Matter Enrichment of Black Rock Series Strata in an Inter-Platform Basin: The Lower Carboniferous Datang Formation, Southern Guizhou, Southwest China

et al. 2018

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The Datang Formation black rock series deposited in an inter-platform basin are considered to be one of the main source rocks in Southwest China. However, their depositional conditions and organic matter enrichment in such a setting are not well understood. In this study, geochemical characteristics of total organic carbon (TOC), major, trace and rare earth elements (REEs) of thirty black rock series samples from a newly-cut roadside outcrop (Zhenning section) in Southern Guizhou, Southwest China are systematically investigated to examine provenance, paleoredox conditions, paleoclimate, paleoproductivity and sedimentary rate, and further to explore their influence on organic matter enrichment. Results show that TOC contents of the investigated samples range from 0.90% to 2.83%, with an average of 1.45%, with TOC variations being in accord with the stratigraphic cyclicity. These data also indicate that the target black rock series were deposited in a combination of continental island arc and active continental margin tectonic setting that exhibited moderate weathering, oxic/dysoxic oxygen levels, hot and arid to semiarid climate, and a higher sedimentary rate. Multiple paleoredox indicators (e.g., Ni/Co, V/Cr, U/Th and V/(V + Ni) ratios), together with slightly negative Ce anomalies and EF U -EF Mo covariation, totally suggest an oxic/dysoxic water environment, which is usually considered unfavorable for organic matter preservation. Average (La/Yb) N ratios (1.41) reflect a higher sedimentary rate, resulting in shortening the exposure time of organic matter in the degradation region of aerobic bacteria under oxic/dysoxic conditions. Of the three factors that could affect organic matter enrichment, including paleoproductivity, paleoredox conditions and sedimentary rate, the relatively high paleoproductivity indicated by the relatively high TOC contents appears to be the dominant factor. In contrast, the other two factors, i.e., paleoredox conditions and the rate of sedimentation play relatively less significant roles. Based on these factors, an enrichment model of organic matter for the black rock series in Southern Guizhou Depression is established. These findings also contribute to constraining the sedimentary environment in such a setting and further deepen our understanding of the potential shale gas resources of the Southern Guizhou Province.

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“…Various compilations of elemental abundances in crustal rocks (Taylor, 1964) suggest that the Ba/Al alu ratios of aluminosilicate detritus in crustal rocks range between 0.005 and 0.01. A Ba/Al alu ratio of 0.0075 is used to calculate a normalised Ba bio content (see Dymond et al, 1992;Wei et al, 2012). Ba bio concentrations are commonly elevated (~1000e5000 ppm) in high productivity regions of the modern equatorial Pacific (Murray and Leinen, 1993).…”

Section: Primary Productivitymentioning

confidence: 99%

Geochemical characteristics in the Longmaxi Formation (Early Silurian) of South China: Implications for organic matter accumulation

Yan

Wang

et al. 2015

Marine and Petroleum Geology

128

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Organic accumulation in the lower Chihsia Formation (Middle Permian) of South China: Constraints from pyrite morphology and multiple geochemical proxies

Cited by 131 publications

References 83 publications

Episodic euxinia in the Changhsingian (late Permian) of South China: Evidence from framboidal pyrite and geochemical data

Episodic euxinia in the Changhsingian (late Permian) of South China: Evidence from framboidal pyrite and geochemical data

Elemental Geochemical Evidence for Depositional Conditions and Organic Matter Enrichment of Black Rock Series Strata in an Inter-Platform Basin: The Lower Carboniferous Datang Formation, Southern Guizhou, Southwest China

Geochemical characteristics in the Longmaxi Formation (Early Silurian) of South China: Implications for organic matter accumulation

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