Physics
Scientific paper
Oct 1971
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971gecoa..35..993l&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 35, Issue 10, pp.993-1003
Physics
13
Scientific paper
D and O 18 of clay minerals and hydroxides in Quaternary soils of the United States correlate directly with D and O 18 of corresponding present-day meteoric waters. Samples from Montana and Idaho are much lower in both D and O 18 than those from coastal areas. The Hawaiian and Gulf Coast samples are highest in D and O 18 . Soils rich in gibbsite or Al-Fe-Si hydroxides are isotopically distinct from clay-rich soils. These systematics indicate that isotopic equilibrium is approximately attained between the weathering products and their coexisting waters. Isotopic fractionation factors estimated from the data for kaolinite-H 2 O and montmorillonite-H 2 O at earth surface temperatures are very similar, with clay - H 2 O hy 0.970 and clay - H 2 O ox 1.027, whereas for gibbsite-H 2 O hy 0.985 and ox 1.018.
Lawrence James R.
Taylor Hugh P. Jr.
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