The clay minerals from the boring Alliance-28, Surinam

Abstract

The clay mineralogical composition of about 75 samples is reported. Kaolinite and anatase are always present, and in some layers these are the only minerals in the clay fraction. In other layers kaolinite is associated with montmorillonite and/or disordered illite-montmorillonite mixed-layer minerals. In two layers illite is found, but always associated with the other clay minerals. In some samples traces of vermiculite and pyrite occur.