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Numerous closed-basin prairie wetlands throughout the Prairie Pothole Region (PPR) of North America maintain moderate surface pond salinities (total dissolved solids [TDS] from 1 to 10gL−1) under semiarid climate by accumulation of gypsum and saline lenses of sulfate-rich porewater (TDS>10gL−1) in wetland sediments during droughts. In order to understand the hydrogeochemical origin and composition...
Carbonate-associated iodine (I/Ca) has been used as a proxy of local, upper-ocean redox conditions, and has successfully demonstrated highly dynamic spatial and temporal patterns across different time scales of Earth history. To further explore the utility of iodine as a paleo-environmental proxy, we present here a new method of extracting organically bound iodine (Iorg) from shale using volumes of...
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