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Earliest Carboniferous cooling step triggered by the Antler orogeny?

¹ Department of Geoscience, University of Iowa, Iowa City, Iowa 52242, USA
² Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48104, USA

We report a large, positive, carbon isotope excursion in the Kinderhookian Stage of the Lower Mississippian in North America and propose that the excursion is linked to the Antler orogeny. The ¹³C excursion reaches +7.1 in the upper part of the Joana Limestone in southeast Nevada and correlates with peaks recognized in Europe and elsewhere in North America. This isotopic shift, one of the largest known Phanerozoic ¹³C events, is found within the upper part of the Siphonodella isosticha–Upper crenulata conodont Zone; its formation coincided with a time of rapid subsidence of the Joana platform within the Antler foreland basin. We interpret the large changes in ¹³C values to reflect enhanced organic carbon burial rates in response to tectonic deepening followed by creation of a restricted water mass at depth in the Antler foredeep and other foredeeps of similar age. The presence of a large ¹³C excursion in the upper part of the S. isosticha Zone is consistent with a late Kinderhookian (Tournaisian) glacial episode.

Key Words: carbon isotope • carboniferous • Antler • Kinderhookian • glaciation

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