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

Schurr, Simon Lukas ORCIDiD
Strauss, Harald
Mueller, Mathias ORCIDiD
Immenhauser, Adrian ORCIDiD

DOI: https://doi.org/10.1111/ter.12554
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9894
Schurr, Simon Lukas; Strauss, Harald; Mueller, Mathias; Immenhauser, Adrian, 2021: Assessing the robustness of carbonate‐associated sulfate during hydrothermal dolomitization of the Latemar platform, Italy. In: Terra Nova, 33, 6, 621-629, DOI: https://doi.org/10.1111/ter.12554. 
 
Strauss, Harald; 1Institut für Geologie und Paläontologie Westfälische‐Wilhelms‐Universität Münster Münster Germany
Mueller, Mathias; 2Institute of Geology, Mineralogy and Geophysics Ruhr‐University Bochum Bochum Germany
Immenhauser, Adrian; 2Institute of Geology, Mineralogy and Geophysics Ruhr‐University Bochum Bochum Germany

Abstract

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.