Oxygen-isotope systematics in a multiphase weathering system in Haiti

Details Oxygen-isotope systematics in a multiphase weathering system in Haiti Oxygen-isotope systematics in a multiphase weathering system in Haiti

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.2831b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 56, Issue 7, pp.2831-2838

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7

Scientific paper

Physical and chemical (partial dissolution) techniques have been applied to a suite of young karst bauxite and laterite samples from the southern peninsula of Haiti. The 18 O values have been obtained for nine mineral species and range from + 1.0 for anatase/rutile to +33.4 for authigenic quartz. On one hand, results for quartz, calcite, kaolinite, gibbsite and boehmite compare favourably with 18 O values predicted from accepted mineral-water fractionation factors, assuming modern temperatures (25 ± 2° C ) and water 18 O values (-3.1 ± 0.5 ). On the other hand, the 18 O values measured for anatase, illite/smectite, chlorite/smectite, and some iron oxide samples do not compare favourably with predicted values. Departures from expected values for these minerals may be related to crystallization from water with a different 18 O value than modern water, an imprecise knowledge of some mineralwater fractionation factors under surficial conditions, or nonattainment of isotopic equilibrium between mineral and water during formation. Partial dissolution techniques hold considerable promise for obtaining quantitative 18 O values of individual minerals in single samples of complex, fine-grained regolith material.

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