Ge/Si and 87Sr/86Sr tracers of weathering reactions and hydrologic pathways in a tropical granitoid system

Derry, L. A.; Pett-Ridge, J. C.; Kurtz, A. C.; Troester, J. W.

Abstract:

Ge/Si and 87Sr/86Sr data from primary and secondary minerals, soil waters, and stream waters in a tropical granitoid catchment quantitatively reflect mineral alteration reactions that occur at different levels within the bedrock-saprolite-soil zone. Near the bedrock-saprolite interface, plagioclase to kaolinite reaction yields low Ge/Si and 87Sr/86Sr. Higher in the regolith column, biotite weathering and kaolinite dissolution drive Ge/Si and 87Sr/86Sr to high values. Data from streams at base flow sample the bedrock-saprolite interface zone, while at high discharge solutes are derived from upper saprolite-soil zone. Coupled Ge/Si and 87Sr/86Sr can be effective tools for quantifying the importance of specific weathering reactions, and for geochemical hydrograph separation. ?? 2005 Elsevier B.V. All rights reserved.

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Article

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70031178

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Derry, L. A.; Pett-Ridge, J. C.; Kurtz, A. C.; Troester, J. W.

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274

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1-3 SPEC. ISS.

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English

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Journal of Geochemical Exploration

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Ge/Si and 87Sr/86Sr tracers of weathering reactions and hydrologic pathways in a tropical granitoid system; 2006; Article; Journal; Journal of Geochemical Exploration; Derry, L. A.; Pett-Ridge, J. C.; Kurtz, A. C.; Troester, J. W.