Isovolumetric geochemical investigation of a buried granite saprolite near Columbia, SC, U.S.A.

Details Isovolumetric geochemical investigation of a buried granite saprolite near Columbia, SC, U.S.A. Isovolumetric geochemical investigation of a buried granite saprolite near Columbia, SC, U.S.A.

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42..417g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 42, Issue 4, pp.417-424

Computer Science

3

Scientific paper

Saprolites are residual soils which preserve the textures of their parent rocks and thus have evolved by an isovolumetric process of weathering ( , 1970, The Geology of Clays , Springer). Using bulk density, saprolite elemental analyses can be converted to units of g cm -3 . Furthermore, an empirical reaction progress diagram can be constructed for a suite of saprolite samples by plotting element concentrations (in g cm -3 ) against bulk density (B.D.). Our data for a granite saprolite show that Al 2 O 3 and SiO 2 decrease in a linear fashion from B.D. 2.1g cm -3 to 1.5g cm -3 but that K 2 O follows a curvilinear trend such that it decreases from 75% of its fresh rock value at B.D. 1.6 g cm -3 to nearly zero at B.D. 1.5 g cm -3 . The only hypothetical reaction paths that are compatible with these B.D. vs A1 2 O 3 , SiO 2 and K 2 O constraints are those in which orthoclase alters to kaolinite through an intermediate potassium phase similar to KAl 3 Si 3 O 10 (OH) 2 or KAl 2 Si 2 O 6 (OH) 3 (hypothetical K-kaolinite). Normative mineral calculations, X-ray diffraction data and structural H 2 O data are employed to test this conclusion.

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