--> Abstract: The Palynological Expression across Two Important Sequence Boundaries in the Triassic Succession, Western Barents Sea, by G. Mangerud; #91012 (1992).
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ABSTRACT: The Palynological Expression across Two Important Sequence Boundaries in the Triassic Succession, Western Barents Sea

MANGERUD, GUNN, Continental Shelf and Petroleum Technology Research Institute (IKU), Trondheim, Norway

Using a sequence Previous HitanalysisNext Hit approach, the palynological characterization across the Spathian-Anisian boundary and the Anisian-Ladinian boundary in the Barents Sea will be presented. The results will include stratigraphic ranges, quantitative data as well as Previous HitpalynofaciesTop, and involve samples from shallow cores and exploration wells. This case study is part of an IKU research program where one objective is to study the characterization of possible changes in palynomorph distribution and quantitative composition across the boundaries in different parts of the Barents Sea.

There are good marker species with first downhole appearance and first income at the two studied stage boundaries, and their ranges are calibrated with standard ammonite zones both at the IKU shallow drilling locality at the Svalis Dome (7323/07) and at outcrop sections on Spitsbergen. The base Anisian is a.o. marked with first income of Striatella seebergensis and Anapiculatisporites spiniger. Base Ladinian is a.o. marked by first income of Echinitosporites iliacoides. First downhole appearance of Kraeuselisporites apiculatus marks the top Anisian, while first downhole appearance of Jerseyiaspora punctispinosa is within the late Anisian. First downhole appearance of Cycloverrutriletes presselensis and consistent Densoisporites nejburgii mark the top Spathian in the area.

In the type wells, the two boundaries correspond to the Klappmyss/Kobbe and Kobbe/Snadd formation boundaries and bound a seismic unit traceable throughout the basin. One objective is to investigate whether these reflectors are time-transgressive, which is of particular interest because they are taken to coincide with stage boundaries. Preliminary results suggest that the two formation boundaries become younger westwards, which is in agreement with a general progradation of the eastern shelf-edge.

 

AAPG Search and Discovery Article #91012©1992 AAPG Annual Meeting, Calgary, Alberta, Canada, June 22-25, 1992 (2009)