Rock-based measurement of temperature-dependent plagioclase weathering

Details Rock-based measurement of temperature-dependent plagioclase weathering Rock-based measurement of temperature-dependent plagioclase weathering

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.2847d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 59, Issue 13, pp.2847-2852

Mathematics

Logic

7

Scientific paper

Long-term ( > 10 5 years) weathering can be quantified by measuring microsopic dissolution of minerals in exposed rock surfaces. Digital backscattered (BSE) electron microscope images of plagioclase porosity in field exposures of known age resolves weathering at finer scales and over longer time spans than conventional solute budget and laboratory studies. Rock-based BSE imaging is therefore a potentially useful tool for quantifying steady-state weathering fluxes occurring over geologic time. Here, we compare results of the rock-based method against solute-budget and experimental data, using plagioclase weathering rates from 14 C-dated basalt flows on Hualalai Volcano in Hawaii, USA. A rock-based field activation energy of 26.2 kcal mol -1 is somewhat higher than solute-budget and laboratory measurements of plagioclase weathering.

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