Askeladden Delta Sequence (Palaeocene) on Spitsbergen - sedimentation and controls on delta formation

[摘要] Because of its coal potential the basal Tertiary Firkanten Formation on Spitsbergen has received much attention. The formation is an offset stacked (overall transgressive) sequence comprising at least eight coastaydeltaic units each of which has a regressive character and is 10 to 30m thick. The lowermost coal-bearing unit (Todalen Member) represents deltas which were largely fluvial- and tide-dominated while the upper unit deltas (Endalen Member) were wave-dominated:One of the transitional deltaic units, the Askeladden Sequence, has been examined in some detail along depositional dip (∼15 km) and strike (∼55 km). This unit represents wave- (tide)dominated delta conditions, and two main facies associations are recognized:1. Delta front/shoreline deposits (Facies Association I).2. Delta plain/coastal plain deposits (Facies Association II).Askeladden sequence accumulated in a shallow, low-gradient embayment (Nordenskiöld Land subbasin) open to the south and southwest. Periodic, strong longshore currents cau...

[学科分类] 自然科学（综合）