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By Ida Valeton (Eds.)

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So far observations have shown titanium neomineralization in laterites to be confined almost entirely to anatase. The volume of anatase neomineralization depends on the quantities of titanium available. Up to 15 % anatase is recorded from bauxites of the Bihar Mountains in India. It is not visible under the microscope, indicating fine dispersion throughout the bauxite. The amount of titanium may even increase with extensive lateral solution 54 WEATHERING AND NEOMINERALIZATION transport. In weathering profiles of the Hawaiian Islands, SHERMAN (1952) observed titanium dioxide concretions up to 1 cm in diameter.

Soil sediments If a period of intensive soil formation is succeeded by uplift, intensified relief energy becomes effective and initiates downhill sliding or denudation of the soil. Such sliding is common in high-level sections of present-day tropical areas. The beginning of such soil movements has not yet been accurately dated but probably occurred in Late Tertiary to Pleistocene time. In this book the term soil sediments is applied to those soils which develop progressively while sliding downhill or became reworked and redeposited.

In water, silica may: (a) polymerize to colloidal silica; (b) form dispersed molecules of %(OH),; (c) occur as ions. The solubility of monomeric silica in undersaturated solutions is a function o f (a) bonds in the crystal lattice; (b) pH; (c) temperature; ( d ) other ions; ( e ) concentration of the solution. , 22"C, there is a strong pH dependency of &(OH), solubility (KRAUSKOPF, 1956, 1959). m. Si/l are dissolved, and only above pH = 9 does dissociation of Si(OH), increase rapidly (Fig. 15).

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