STACKED FLUVIODELTAIC CYCLES IN THE UPPER PROTEROZOIC GODKEILA MEMBER, VARANGER PENINSULA, NORTHERN NORWAY

The Upper Proterozoic Godkeila Member in the Persfjorden area (Varange r Peninsula) comprises four stacked fluviodeltaic cycles, 70-200 m thi ck. Four facies associations have been distinguished: (A) prodelta san dy turbidites; (B) silt-dominated delta front; (C) sand-dominated delt a front; and (D) sandy, braided alluvial plain. Each cycle is a shoali ng-upward succession of associations B --> (+/- A) --> B --> C --> D. The characteristics of the facies associations suggest a fluvial-domin ated delta with low-gradient braided rivers entering a relatively low- energy, tide-influenced basin. The stratigraphy of the individual cycl es suggests progradation under an overall relative rise in sea level. The erosional surface between the fluvial and marine associations may, in contrast, represent a minor relative fall in sea level and thus a forced regression. The cycle termination is attributed to an intermitt ent, possible fault-controlled shift of the depocentre. The considerab le regional thickness variations of the Godkeila Member (600-1450 m) a long the depositional strike is thought to be mainly a result of diffe rential subsidence.