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Isotopic geochemistry of Panama rivers

January 1, 2015

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 CO2 consumption in the tropics. D/H and 18O/16O 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 87Sr/86Sr 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.

Publication Year 2015
Title Isotopic geochemistry of Panama rivers
DOI 10.1016/j.proeps.2015.07.026
Authors Russell S. Harmon, Gerhard Worner, Michael Pribil, Zoltan Kern, Istvan Forizs, W. Berry Lyons, Christopher B. Gardner, Steven T. Goldsmith
Publication Type Article
Publication Subtype Journal Article
Series Title Procedia Earth and Planetary Science
Index ID 70188826
Record Source USGS Publications Warehouse
USGS Organization Central Mineral and Environmental Resources Science Center