Organic geochemical and petrographic characteristics of the Cambrian-Ordovician organic-rich marine shales in Scandinavia

Zheng, Xiaowei; Schovsbo, Niels H.; Bian, Leibo; Rudra, Arka; Sanei, Hamed

doi:10.1016/j.petsci.2023.04.011

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Petroleum Science

2023

DOI: 10.1016/j.petsci.2023.04.011

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Organic geochemical and petrographic characteristics of the Cambrian-Ordovician organic-rich marine shales in Scandinavia

Xiaowei Zheng¹,

Niels H. Schovsbo²,

Leibo Bian³

et al.

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2024

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Cited by 2 publications

References 33 publications

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Influence of thermal intrusion on the Alum Shale from south central Sweden

Liu,

Zheng,

Schovsbo

et al. 2024

International Journal of Coal Geology

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Influence of thermal intrusion on the Alum Shale from south central Sweden

Liu,

Zheng,

Schovsbo

et al. 2024

International Journal of Coal Geology

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Improving Mercury Systematics With Molybdenum and Vanadium Enrichments: New Insights From the Cambrian‐Ordovician Boundary

Bian,

Chappaz,

Wang

et al. 2024

Geophysical Research Letters

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The Cambro‐Ordovician interval marks a significant transition from extinction to bio‐diversification in deep time. However, the relationship of bio‐transition to volcanism, commonly characterized by mercury (Hg) systematics in sedimentary records, has not been examined. We present the first Cambro‐Ordovician Hg systematics from the Scandinavian Alum Shale. Our results show pronounced Furongian Hg enrichments, coupled with positive Δ199Hg, Δ200Hg, and Δ201Hg values and negative Δ204Hg values that we ascribe to atmospheric Hg transport over long‐distances, while Early Ordovician Hg anomalies, characterized by near‐zero mass‐independent isotope values, indicative of submarine source. Our findings are supported by two new proxies: molybdenum‐Hg and vanadium‐δ202Hg co‐variations, demonstrating Hg systematics were strongly influenced by changes in source and depositional conditions. Constrained by a synchronous atmospheric‐tectonic‐oceanic model, we hypothesize Furongian subaerial volcanism contributed to global extinction and oceanic anoxia, whereas Early Ordovician submarine volcanism concurrent with ocean water upwelling promoted the nascent bio‐diversification.

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Organic geochemical and petrographic characteristics of the Cambrian-Ordovician organic-rich marine shales in Scandinavia

Cited by 2 publications

References 33 publications

Influence of thermal intrusion on the Alum Shale from south central Sweden

Influence of thermal intrusion on the Alum Shale from south central Sweden

Improving Mercury Systematics With Molybdenum and Vanadium Enrichments: New Insights From the Cambrian‐Ordovician Boundary

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