Gerhard Worner Michael J. Pribil Zoltan Kern Istvan Forizs W. Berry Lyons Christopher B. Gardner Steven T. Goldsmith Russell S. Harmon 2015 <p><span>River water samples collected from 78 watersheds rivers along a 500-km transect across a Late Cretaceous-Tertiary andesitic volcanic arc terrane in west-central Panama provide a synoptic overview of riverine geochemistry, chemical denudation, and CO</span>₂<span> consumption in the tropics. D/H and </span>¹⁸<span>O/</span>¹⁶<span>O relationships indicate that bedrock dissolution of andesitic arc crust in Panama is driven by water-rock interaction with meteoric precipitation as it passes through the critical zone, with no evidence of a geothermal or hydrothermal input. Sr-isotope relationships suggest a geochemical evolution for Panama riverine waters that involves mixing of bedrock pore water with water having </span>⁸⁷<span>Sr/</span>⁸⁶<span>Sr ratios between 0.7037-0.7043 and relatively high Sr-contents with waters of low Sr content that enriched in radiogenic Sr that are diluted by infiltrating rainfall to variable extents.</span></p> application/pdf 10.1016/j.proeps.2015.07.026 en Elsevier Isotopic geochemistry of Panama rivers article