The occurrence and chemical implications of geothermal convection of seawater in continental shelves

Details The occurrence and chemical implications of geothermal convection of seawater in continental shelves The occurrence and chemical implications of geothermal convection of seawater in continental shelves

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30uhls4w&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 21, pp. HLS 4-1, CiteID 2127, DOI 10.1029/2003GL018499

Mathematics

Logic

3

Hydrology: Groundwater Transport, Hydrology: Water/Energy Interactions, Mathematical Geophysics: Modeling, Oceanography: Biological And Chemical: Geochemistry

Scientific paper

Geothermal convection is an important driving force for fluid flow and diagenesis in carbonate platforms, and the similar shape of continental shelves in general suggests that geothermal convection could occur in continental shelves around the world. Numerical models based on seven transects of the shelf off the east coast of North America were developed to bracket possible fluxes. Simulations assuming relatively permeable sediments (medium-grained carbonates) failed to produce significant thermal variations, suggesting that chemical tracers will be required to detect this flow in the field. Fluxes calculated assuming lower permeabilities (fine grained carbonates) between Cape Fear and the Savannah River were approximately 3 orders of magnitude smaller than river discharge for the area, a difference similar to that between global river discharge and hydrothermal convection at mid-ocean ridges. Sediment diagenesis during geothermal convection in continental shelves thus has the potential to affect ocean chemical budgets, including potassium, calcium, and magnesium.

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