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Late Triassic (early Carnian-Norian) palynology of the Sentralbanken High, Norwegian Barents Sea

Niall William Paterson, Gunn Mangerud, Lars Haug Holen, Johne Landa, Bjorn Anders Lundschien and Froydis Eide
Late Triassic (early Carnian-Norian) palynology of the Sentralbanken High, Norwegian Barents Sea
Palynology (January 2019) 43 (1): 53-75

Abstract

Four stratigraphic cores (7533/2-U-1, 2-U-2, 3-U-7 and 7534/4-U-1) drilled in the Sentralbanken High provide important reference sections for the Upper Triassic succession in the northern Barents Sea. The cores span the De Geerdalen, Flatsalen and Svenskoya formations (Kapp Toscana Group), which are equivalent to the Snadd to middle Fruholmen formations of the southern Barents Sea. Only cursory palynological study of the cores has been conducted previously, and no published palynofacies data is available. We present a detailed palynostratigraphy from the cores, and describe six informal palynological assemblages. Comparison with independently dated sections from elsewhere in the region enables a revised age interpretation of early Carnian to Norian for the cored interval, thereby improving correlation between Sentralbanken, Svalbard and the southern Barents Sea. A dominance of amorphous organic matter (AOM) and marine palynomorphs indicates a distal suboxic-anoxic marine depositional environment for the lower De Geerdalen Formation, with an abrupt change to a nearshore marine environment above an erosion surface in core 7534/4-U-1. Palynofacies from the remainder of the formation are characterised by a dominance of phytoclasts and are interpreted as indicative of a delta front to coastal plain environment. The reappearance of AOM, microforaminiferal test linings and marine microphytoplankton in the Flatsalen Formation in cores 7533/2-U-1 and 2-U-2 reflects a regional transgression of early Norian age. Reworked palynomorphs, shale rip-up clasts and a transition to phytoclast-dominated palynofacies above an erosion surface at the base of the overlying Svenskoya Formation is consistent with a disconformity, which was previously identified as a possible sequence boundary on the neighbouring island of Hopen.


ISSN: 0191-6122
EISSN: 1558-9188
Serial Title: Palynology
Serial Volume: 43
Serial Issue: 1
Title: Late Triassic (early Carnian-Norian) palynology of the Sentralbanken High, Norwegian Barents Sea
Affiliation: University of Bergen, Department of Earth Science, Bergen, Norway
Pages: 53-75
Published: 20190102
Text Language: English
Publisher: American Association of Stratigraphic Palynologists, Dallas, TX, United States
References: 102
Accession Number: 2019-014750
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 4 plates, sketch maps
N75°43'60" - N75°55'60", E33°25'00" - E34°13'00"
Secondary Affiliation: Norwegian Petroleum Directorate, NOR, Norway
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, Copyright, American Association of Stratigraphic Palynologists. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201910
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