Sulfur Isotopic Characterization of Bedrock, Alkaline Lakes, and Evaporitic Sediment from a Closed-drainage Basin on the Oregon Basalt Plateau

Sulfur Isotopic Characterization of Bedrock, Alkaline Lakes, and Evaporitic Sediment from a Closed-drainage Basin on the Oregon Basalt Plateau

227 pages· 2006· ISBN 9780542850004
About
Water samples were collected from springs and lakes in Warner Valley. Values of delta34S for dissolved sulfate (delta 34SDS) in water samples range from 7.5 to 10.8‰ in springs and from 7.0 to 14.8‰ in lakes. Values of delta 34SDS in spring waters largely overlap with values of delta 34SAS in basaltic bedrock, suggesting that gypsum in basalts is the main sulfur source for Warner Valley springs. Higher delta34S DS values in lake waters than in spring waters suggest preferential uptake of 32S from the dissolved sulfate pool during bacterial sulfate reduction (BSR) and sequestration as sedimentary sulfides.

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