Use of 234 U/ 238 U disequilibrium in measuring chemical weathering rate of rocks

Details Use of 234 U/ 238 U disequilibrium in measuring chemical weathering rate of rocks Use of 234 U/ 238 U disequilibrium in measuring chemical weathering rate of rocks

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44..103m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 44, Issue 1, pp.103-108

Physics

9

Scientific paper

The rate of chemical weathering of rocks has been determined by using uranium as a natural isotopic tracer. The concentration of uranium and 234 U/ 238 U ratio in natural waters, rocks, and soils of the Preto river basin (Bahia State, Brazil) was measured by alpha-ray spectroscopy. The activity ratio U234/U238 measured in the various samples indicates the uranium fraction which is dissolved from rocks during the weathering process. The results obtained show that 1 m of rock needs 25,000 yr to be weathered in this region under present climatic conditions.

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