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Magmatic anhydrite-sulfide assemblages in the plumbing system of the Siberian Traps

¹Department of Geological Sciences, Indiana University, Bloomington, Indiana 47401, USA
²Department of Geology, University of Toronto, Ontario M5S 3B1, Canada
³Department of Earth and Space Sciences, University of California–Los Angeles, Los Angeles, California 90095, USA

Correspondence: *E-mail: cli{at}indiana.edu.

We report the first discovery of magmatic anhydrite-sulfide assemblages in a subvolcanic intrusion associated with the Siberian Traps. The ³⁴S values of anhydrite and coexisting sulfide crystals analyzed by ion probe are 18–22 and 9–11, respectively. More than 50% of the total sulfur in the intrusion is estimated to derive from marine evaporites in the footwall strata. The contaminated magma was highly oxidized and able to dissolve up to one order of magnitude more sulfur than pure mantle-derived basaltic magma. Such contaminated magma, if erupted, would have released far more SO₂ into the atmosphere than is generally appreciated.