Strontium isotopes

A Simple Model of Strontium and Manganese dynamics in a tropical Rain Forest

Jordan C. F., Kline J.R., Sasscer D.S. A Simple Model of Strontium and Manganese Dynamics in a tropical Rain Forest. Health Physics Pergamon Press 1973. Vol 24 (May) pp. 477-489.

Abstract: 
Quantities and fluxes of stable strontium and manganese were measured in a Puerto Rican tropical rain forest. These measurements were used to formulate a mathematical model of the dynamics of these elements. The model was then used to make predictions of the fate of the radioactive analogs of these isotopes after input via atmospheric fallout. The model was partially validated by measuring actual fallout levels in the forest during part of the time span covered by the model's predictions.

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

Derry, LA, JC Pett-Ridge, AC Kurtz, and JW Troester. 2006. Ge/Si and sr-87/Sr-86 tracers of weathering reactions and hydrologic pathways in a tropical granitoid system. Journal of Geochemical Exploration 88 (1-3) (JAN-MAR): 271-4.

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.
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