Sedimentology and isotopic chemistry of the Bengal Fan sediments: the denudation of the Himalaya

Abstract

The whole section can be subdivided into three major periods of sedimentation. Between 17.1 and ~6 m.y., and between ~0.8 m.y. to present, the sediments are characterized by sandy and silty turbiditic inputs with a high proportion of minerals derived from a gneissic source without alteration. The 6-to 0.8-m.y. period is represented by an alternation of sandy/silty horizons, muds, and calcareous muds rich in smectite. Evolution in a soil environment and exchanges with meteoric ground water is suggested. -from Authors