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Geological Society, London, Special Publications; 1995; v. 98; p. 163-172;
DOI: 10.1144/GSL.SP.1995.098.01.09
© 1995 Geological Society of London

Magnetostratigraphic Applications

Magnetostratigraphic correlations in two cores from the late Triassic Lunde Formation, Beryl Field, northern North Sea, UK

Mark W. Hounslow1, Barbara A. Maher1, Laurence Thistlewood2 & Kevin Dean3

1 School of Environmental Sciences, University of East Anglia, Norwich NR3 7TJ, UK
2 British Antarctic Survey, Madingley Road, Cambridge, UK
3 Mobil North Sea Ltd, Clements Inn, London, UK

The magnetostratigraphy of two cores from the late Triassic Lunde Formation of the northern North Sea are compatible with the calibrated magnetostratigraphy for the Norian stage determined by Gallet et al. (1993) from Tethyan carbonates. The polarities of the cores indicate a lower to upper Norian age for core 9/13A–36 and lower to middle Norian age for core 9/13A–A45. The isolated characteristic magnetizations are due to a Triassic detrital remanent magnetization, which is partially overprinted with a drilling-induced remanence of two origins. The drilling-induced remanences are associated with (1) the main coring procedure, producing an overprint which is oriented downcore and (2) the subsample coring procedure, which produces an overprint parallel to the subsample core axis and directed outwards from the main core axis. The elimination of those specimens with a significant drilling-induced remanence is important for the determination of the magnetostratigraphy in these cores.