Assessing the robustness of carbonate‐associated sulfate during hydrothermal dolomitization of the Latemar platform, Italy

Carbonate‐associated sulfate (CAS) is an important proxy for reconstructing marine sulfur cycling throughout Earth's history. In order to assess the impact of carbonate neomorphism on δ34SCAS data, a mineralogical‐spatial transect from early diagenetic limestone into low‐temperature hydrotherma...

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Bibliographic Details
Published in:Terra nova (Oxford, England) England), 2021-12, Vol.33 (6), p.621-629
Main Authors: Schurr, Simon Lukas, Strauss, Harald, Mueller, Mathias, Immenhauser, Adrian
Format: Article
Language:English
Subjects:
Archives & records
Carbonates
Diagenesis
Dolomitization
Dolostone
Hydrothermal alteration
Limestone
Seawater
Sulfates
Sulfur
Sulphur
Temperature
Triassic
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Summary:Carbonate‐associated sulfate (CAS) is an important proxy for reconstructing marine sulfur cycling throughout Earth's history. In order to assess the impact of carbonate neomorphism on δ34SCAS data, a mineralogical‐spatial transect from early diagenetic limestone into low‐temperature hydrothermal dolostone was analyzed in the middle Triassic Latemar platform interior, northern Italy. This study addresses the yet unconstrained question whether hydrothermal dolostone preserves a marine δ34SCAS signature and, hence, might represent an archive for past seawater sulfate. In this study, δ34SCAS values were measured in low‐temperature hydrothermal dolostone and compared with data from their corresponding precursor limestone. Results shown here reveal that δ34SCAS values for dolostone and precursor limestone are indistinguishable. This points to a rock‐buffered middle Triassic marine δ34S signature not affected by hydrothermal alteration. Hence, hydrothermal dolostone represents, under favorable conditions, an archive for unraveling past marine sulfur cycling.
ISSN:0954-4879
1365-3121
DOI:10.1111/ter.12554