Nature, geometry and preservation of siliciclastic sediments in cratonic ramp basin lowstands, late Proterozoic, Mali, West Africa) (French with abridged English

Abstract:

The purpose is to illustrate the sediment architecture in siliciclastic glacial ramp basin lowstands controlled by the tectonic events related to the foreland basin evolution. The study concerns the late Proterozoic sediments of the Bakoye Group deposited in the Taoudeni basin in western Mali. They were deposited during the 650 Ma Varangian glaciation and the Pan-African orogeny caused by the suturing of the Guyana shield to the West African craton. This example illustrates the high diversity and the complex geometric relationship of the sedimentary record in the proximal part of the lowstand complex located at the topmost part of the flexural bend of a pericratonic foreland basin. It is characterized essentially by: 1) an incised palaeovalley related to the rejuvenation of the fluvial profiles subsequently filled during base level rise time with thick continental series, and 2) high energy transgressive processes realized by retrogradation and systematic ablation of the shoreface deposits. -from English summary

Año de publicación:

1995

Keywords:

Fuente:

scopus