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A Study of a Deep Weathering Profile on Granite in Peninsular Malaysia: I. Physico-Chemical and Micromorphological Properties¹

ABSTRACT

To facilitate description and study, the deep profile is divided into several morphological zones, via., , _m, _p and zones. Clay content progressively increases from the rock zone to the soil zone . The silt/clay ratio increases from the to the upper part of the _p zone and then decreases again. These changes are explained in terms of the fragmentation or aggregation of various minerals during the clay separation procedure. Estimates of the mineralogical composition in the fine earth shows differences in the zones, and the charge characteristics are related to these.

Changes in the microfabric are monitored with thin-sections. Micrographs are presented showing fabric characteristics and some examples of pseudomorphic alteration. A brief discussion on the genesis of the profile is given.

¹ Contribution from the Geological Institute, Krijgslaan, 271, Gent, Belgium. Work supported in part by a grant from the National Science Foundation, Belgium.

² Assistant and Graduate Student, respectively.

Received for publication July 1, 1977. Accepted for publication October 12, 1977.

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