TY - JOUR
T1 - Sulfur isotopic evidence for sources of volatiles in Siberian Traps magmas
AU - Black, Benjamin A.
AU - Hauri, Erik H.
AU - Elkins-Tanton, Linda T.
AU - Brown, Stephanie M.
N1 - Funding Information:
This study was funded by grant EAR-0807585 from NSF Continental Dynamics , and supplemented by the MIT Wade Fund . The authors are indebted to Charlie Mandeville for sharing sulfur isotope standards and reference information, and for graciously permitting us to include his sulfur data in the supplementary table. The American Museum of Natural History provided maymechite samples collected by Valeri Fedorenko. Roman Veselovskiy, Vladimir Pavlov, Anton Latyshev, Anya Veselovskiy, and Seth Burgess were valued collaborators during field work. Roxane Bowden assisted with sulfur isotope measurements in sedimentary rocks. BB thanks Mike Rowe and Alexander Polozov for helpful discussions. Henrik Svensen and Alexander Polozov generously shared their excellent map. Comments from two anonymous reviewers improved the manuscript. The authors gratefully thank Jianhua Wang and Brenda Carbone.
PY - 2014/5/15
Y1 - 2014/5/15
N2 - The Siberian Traps flood basalts transferred a large mass of volatiles from the Earth's mantle and crust to the atmosphere. The eruption of the large igneous province temporally overlapped with the end-Permian mass extinction. Constraints on the sources of Siberian Traps volatiles are critical for determining the overall volatile budget, the role of crustal assimilation, the genesis of Noril'sk ore deposits, and the environmental effects of magmatism. We measure sulfur isotopic ratios ranging from -10.8‰ to +25.3‰ Vienna Cañon Diablo Troilite (V-CDT) in melt inclusions from Siberian Traps basaltic rocks. Our measurements, which offer a snapshot of sulfur cycling far from mid-ocean ridge and arc settings, suggest the δ34S of the Siberian Traps mantle melt source was close to that of mid-ocean ridge basalts. In conjunction with previously published whole rock measurements from Noril'sk, our sulfur isotopic data indicate that crustal contamination was widespread and heterogeneous-though not universal-during the emplacement of the Siberian Traps. Incorporation of crustal materials likely increased the total volatile budget of the large igneous province, thereby contributing to Permian-Triassic environmental deterioration.
AB - The Siberian Traps flood basalts transferred a large mass of volatiles from the Earth's mantle and crust to the atmosphere. The eruption of the large igneous province temporally overlapped with the end-Permian mass extinction. Constraints on the sources of Siberian Traps volatiles are critical for determining the overall volatile budget, the role of crustal assimilation, the genesis of Noril'sk ore deposits, and the environmental effects of magmatism. We measure sulfur isotopic ratios ranging from -10.8‰ to +25.3‰ Vienna Cañon Diablo Troilite (V-CDT) in melt inclusions from Siberian Traps basaltic rocks. Our measurements, which offer a snapshot of sulfur cycling far from mid-ocean ridge and arc settings, suggest the δ34S of the Siberian Traps mantle melt source was close to that of mid-ocean ridge basalts. In conjunction with previously published whole rock measurements from Noril'sk, our sulfur isotopic data indicate that crustal contamination was widespread and heterogeneous-though not universal-during the emplacement of the Siberian Traps. Incorporation of crustal materials likely increased the total volatile budget of the large igneous province, thereby contributing to Permian-Triassic environmental deterioration.
KW - Crustal contamination
KW - End-Permian mass extinction
KW - Siberian traps
KW - Sulfur
KW - Volatile release
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U2 - 10.1016/j.epsl.2014.02.057
DO - 10.1016/j.epsl.2014.02.057
M3 - Article
AN - SCOPUS:84897085766
SN - 0012-821X
VL - 394
SP - 58
EP - 69
JO - Earth and Planetary Science Letters
JF - Earth and Planetary Science Letters
ER -