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Isotopic Geochemistry of Panama Rivers

Hits: 1252
Year:
2015
Type of Publication:
Article
Keywords:
Panama
Authors:
Harmon, Russell S.; Wörner, Gerhard; Pribil, Michael J.; Kern, Zoltán; Fórizs, István; Lyons, W. Berry; Gardner, Christopher B.; Goldsmith, Steven T.
Journal:
Procedia Earth and Planetary Science
Volume:
13
Pages:
108 - 111
ISSN:
1878-5220
BibTex:
Note:
11th Applied Isotope Geochemistery Conference AIG-11
Abstract:
Abstract 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.

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