Mathematics – Logic
Scientific paper
Sep 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965gecoa..29.1051w&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 29, Issue 9, pp.1051-1062
Mathematics
Logic
2
Scientific paper
Bauxite and kaolinitic clay have formed by the weathering of andesite lava under humid tropical conditions in west Sarawak, Malaysia. At Sematan the bauxite is about 10 ft thick on hills (hill bauxite), and extends under surrounding alluvial sand and clay where its chemical and mineralogical composition has been secondarily modified (swamp bauxite). During the formation of hill bauxite, Cr, Zr and Ga are concentrated, the content of V is unchanged, and Ni, Co, P, Mn, Sr and Y are depleted. The secondary changes modifying the swamp bauxite have not affected the content of Ca and Zr, but Ga has been increased, and V, Ni, Co, P and Mn have been depleted. During the formation of kaolinitic clay, Cr, Zr, Ga, V, Ni, Co and P are concentrated, and Mn, Sr and Y are depleted. An attempt is made to relate these differences to the physical and chemical environment existing during the weathering.
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