Tonian deltaic and storm-influenced marine sedimentation on the edge of Laurentia: The Veteranen Group of northeastern Spitsbergen, Svalbard (original) (raw)

Chapter 55 Glacial sediments and associated strata of the Polarisbreen Group, northeastern Svalbard

Geological Society, London, Memoirs, 2011

Northeastern Svalbard hosts exceptionally well-preserved Neoproterozoic sediments. The glaciogenic Petrovbreen Member and Wilsonbreen Formation (Fm.) of the Polarisbreen Group crop out in a narrow, Caledonian-aged fold-and-thrust belt spanning from Olav V Land on Spitsbergen in the south to western Nordaustlandet in the north. The older Petrovbreen Member is thin (0–52 m) and patchily preserved, comprising mainly poorly stratified, dolomite-matrix diamictite likely deposited in a marine setting. The basal contact of the Petrovbreen Member erosionally truncates the upper Russøya Member, which preserves a large (12‰) negative C-isotope anomaly. The Petrovbreen Member is overlain by 200 m of dark, monotonous shales of the MacDonaldryggen Member, followed by cherty dolomite grainstone and microbiolamintes of the Slangen Member. The upper Slangen Member is an exposure surface in the southern part of the belt, but in northern Spitsbergen and on Nordaustlandet is transitional into sands of...

The Late Cryogenian Warm Interval , NE Svalbard : 1 chemostratigraphy and genesis 2 3

2016

20 21 The Late Cryogenian Warm Interval (LCWI) refers to a non-glacial interval that separates presumed 22 representatives of the Sturtian and Marinoan panglaciations. Its duration is poorly constrained 23 radiometrically and its deposits are relatively poorly known in most geographic regions. This paper aims to 24 constrain the duration, palaeoenvironments and petrogenesis of such deposits in the classic region of NE 25 Spitsbergen, Svalbard. The succession comprises a 200-205 m dolomitic shale (Macdonaldryggen Member, 26 known as E3, of the Elbobreen Formation) overlain by oolitic dolomite Slangen Member (E4), 15-25 m thick, 27 with limestone developed at top and base of E3 in the south of the area. The assumed age context of the 28 succession has been confirmed by the presence of a typical Sturtian cap carbonate profile of negative to 29 positive C, and primary Sr isotope compositions of basal E3 limestones <0.7072 and of upper E3 30 limestones of 0.7076. 31 At the base of E3...