Determination of Volcanic Flux Rates and Application to Understanding Regional Geochemical Trends and Element Mass Balances in Central America

Project Details


EAR-0203388 Michael J. Carr Several important questions about the nature of the subduction process require a transition from existing qualitative subduction signals, such as Ba/La and 10Be/9Be, to quantitative fluxes such as Ba flux in gm/unit arc length/yr. This is accomplished by employing 40Ar/39Ar dating techniques to measure the ages of the older units in several large Central American volcanic centers. These new data, along with previously determined volume measurements, enable the determination of average volcanic flux rates for different segments of the arc. Integrating volcanic flux rates with regional geochemical data allows an estimate of element fluxes to be made. From these integrated data several major problems are being addressed, including the physical cause of along-strike variations in subduction signal in Central America, the mass balance of elements cycling through the Central American arc, and the quantity of incompatible elements that are delivered to the deep mantle through subduction.

Effective start/end date7/1/026/30/05


  • National Science Foundation: $180,063.00


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