Sedimentary expression and modelling of glacial fluctuations. Example of late Proterozoic deposits in western Mali

Abstract:

The main purpose of this work is to illustrate the sedimentary record of glacially induced climatic fluctuations in terms of genetic stratigraphic units. The basin studied to trace glacioclimatic relative sea-level changes is the late Proterozoic Bakoye Group in Wassangara basin in Western Mali. The reasons for this choice are: the stable epicratonic context, the glaciomarginal setting with respect to the paleocenter of the Late Proterozoic icesheet, and the exceptional quality of exposures to observe paleo-shoreline evolution in space and time. The method of study is an adaptation of sequence stratigraphy methodology to a very high resolution sedimentologic analysis in continental to marine transitional zones. Most of the sequences are controlled either by tectonic and climatic processes but the study of sediment transfer at the elementary event scale shows how external factors which contrain the deposition of high resolution sequences, predominantly of climatic origin, control the geometry of mixed climatic and tectonic origin higher order sequences. -from English summary

Año de publicación:

1992

Keywords:

Fuente:

scopus