Abstract:

Western Hunan region has deposited clastic rocks of Silurian. Except the strata of Upper Silurian are missing, other interfaces between strata are mostly of integrated contacts. Based on comprehensive stratigraphy study, many sedimentary system types, such as deep water retention basin, foreland basin turbidite fan, delta, shoreland and tidal flat, can be distinguished at western Hunan region, and the sea level turns shallow upwards. The sediment source was from the Xuefeng uplift in the southeastern of Western Hunan. The structural evolution of the Silurian foreland basin in Western Hunan has undergone several periods: the basin formation period, the development period, the shrinking period, and the extinction period of the foreland. The relationship between sedimentary and tectonic evolution is that the deep water retention basin sedimentary system was formed in the initial period of the foreland basin, the marine turbidite fan sedimentary system was formed in the developed period of the foreland basin, the delta sedimentary system was formed in the shrinking period of the foreland basin, and the tidal flatsand damshoreline sedimentary system was formed in the extinction period of the foreland basin.

Key words: Silurian, foreland basin, sedimentary system, Western Hunan