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Insights from stable S and O isotopes into biogeochemical processes and genesis of Lower Cambrian barite–pyrite concretions of South China

DRS at CSIR-National Institute of Oceanography

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Title Insights from stable S and O isotopes into biogeochemical processes and genesis of Lower Cambrian barite–pyrite concretions of South China
 
Creator Goldberg, T.
Mazumdar, A.
Strauss, H.
Shields, G.
 
Subject Sulphur isotope
oxygen isotopic
 
Description Pyrite bearing barite concretions are abundant in black shales of the Early Cambrian Niutitang formation in China. Their occurrence is connected with low sedimentation rates. Sulphur and oxygen isotopic compositions of barite display highly enriched values, averaging in 68±5‰ and 20±1‰, respectively. Pyrite sulphur has an isotopic composition of ~10‰. The elevated isotopic compositions, no systematic difference in isotopic composition throughout the concretions, and presumably low sulphate concentrations during deposition indicate late diagenetic barite precipitation at an advanced stage of bacterial sulphate reduction. During concentric growth from concretion centre to margin different Ba+ and SO4 2- bearing fluids interacted at different times, which resulted in non uniformly spread d34S and d18O values throughout the concretions.
 
Date 2006-11-14T11:45:47Z
2006-11-14T11:45:47Z
2006
 
Type Journal Article
 
Identifier Organic Geochemistry, vol.37, 1278-1288p.
http://drs.nio.org/drs/handle/2264/491
 
Language en
 
Rights An edited version of this paper was published by Elsevier. Copyright [2006] Elsevier
 
Format 1668147 bytes
application/pdf
 
Publisher Elsevier