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A revised palynozonation for the Middle–Upper Triassic (Anisian–Rhaetian) Series of the Norwegian Arctic

Published online by Cambridge University Press:  14 November 2019

Niall William Paterson Open the ORCID record for Niall William Paterson [Opens in a new window]  and
Gunn Mangerud
Niall William Paterson*
Affiliation:
Department of Earth Science, University of Bergen, Post box 7803, N-5020 Bergen, Norway CASP, West Building, Madingley Rise, Cambridge, CB3 0UD, United Kingdom
Gunn Mangerud
Affiliation:
Department of Earth Science, University of Bergen, Post box 7803, N-5020 Bergen, Norway
*
Author for correspondence: Niall William Paterson, Email: niall.paterson@casp.org.uk
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Abstract

The Barents Sea region of Arctic Norway preserves a thick succession of marine and deltaic Triassic strata that yield an abundant and diverse association of terrestrial and marine palynomorphs. Despite being the principal means for dating and correlation across this vast region, the Upper Triassic palynozonal resolution has remained relatively low. This is problematic due to the thickness of the Upper Triassic Series and since this corresponds to the longest of the three Triassic epochs. This paper presents a refined Middle–Upper Triassic palynozonation for the region, based on a detailed investigation of multiple localities ranging from the Svalbard Archipelago to the southern Barents Sea. The zonation comprises eleven spore-pollen zones: the Carnisporites spiniger, Triadispora obscura and Protodiploxypinus decus zones (Anisian), the Echinitosporites iliacoides Zone (Ladinian), the Semiretisporis hochulii, Podosporites vigraniae, Leschikisporis aduncus, and Protodiploxypinus spp. zones (Carnian), the Classopollis torosus, and Quadraeculina anellaeformis zones (Norian), and the Ricciisporites spp. Zone (Rhaetian). Additionally, two new dinoflagellate cyst zones are defined: the Rhaetogonyaulax arctica (upper Carnian – lower Norian) and Rhaetogonyaulax rhaetica (lower Norian) zones. Three new age-significant palynomorph taxa are described: Kyrtomisporis moerki sp. nov., Podosporites vigraniae sp. nov. and Semiretisporis hochulii sp. nov. The revised palynozonation is compared with previous palynozonal schemes for the Greater Barents Sea region, and its relationship to Triassic palaeoclimate, palaeoenvironments and sequence stratigraphy is discussed.

Keywords

TriassicpalynologyzonationSvalbardBarents Sea
Type
Original Article
Information
Geological Magazine , Volume 157 , Special Issue 10: Mesozoic of the Arctic , October 2020 , pp. 1568 - 1592
Copyright
© Cambridge University Press 2019

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