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Pyrite Concretions in the Lower Cambrian Niutitang Formation, South China: Response to Hydrothermal Activity
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Pyrite Concretions in the Lower Cambrian Niutitang Formation, South China: Response to Hydrothermal Activity
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Journal Article
Pyrite Concretions in the Lower Cambrian Niutitang Formation, South China: Response to Hydrothermal Activity
2023
Overview
The Early Cambrian Niutitang Formation is characterized by wide distribution of black shales on Yangtze Block, South China. Here we have reported the pyrite concretions in the bottom of the Niutitang Formation deposited in the slope-basin environment of Yangtze Block. The pyrite concretion was mainly composed of pyrite associated with hydrothermal minerals (barite, hyalophane, tetrahedrite), followed by quartz and organic matter. Trace elements Mo and U displayed significant enrichment (enrichment factors > 10), indicating the euxinic bottom water condition. Cu, Ni, and excess Ba concentrations were relatively high, denoting high primary productivity.
In-situ
sulfur isotope compositions of pyrite concretions δ
34
S
py
) showed little variations (13.2‰–19.4‰) and small fractionations compared to coeval seawater δ
34
Sso
4
. Petrological and geochemical analyses indicated the pyrite concretions were formed in the sediment-water interface during the early diagenesis, with H
2
S diffusing from the euxinic water, and influenced by hydrothermal activity leading to the coexistence of barite, hyalophane, and tetrahedrite. These results imply euxinic bottom water featured by high primary productivity and increasing riverine flux of sulfate from chemical weathering during the Early Cambrian.
Publisher
China University of Geosciences,Springer Nature B.V,Key Laboratory of Tectonics and Petroleum Resources,Ministry of Education,China University of Geosciences,Wuhan 430074,China%School of Geosciences,Yangtze University,Wuhan 434023,China
Subject
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