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Austrochlamys heardensis (Fleming, 1957) (Bivalvia: Pectinidae) from Central Kerguelen Plateau, Indian Ocean: palaeontology and possible tectonic significance

journal contribution
posted on 2023-05-16, 16:00 authored by Quilty, PG, Murray-Wallace, CV, Whitehead, JM
Austrochlamys heardensis (Fleming) is recorded from a boulder of Late Pliocene (3.62-2.5 Ma) volcaniclastic sandstone dredged 70 km east-north-east of Heard Island, the third record of the species. The collection is much larger than the original described by Fleming and includes left valves which are described for the first time. The species is compared with A. anderssoni (Hennig) from Cockburn Island and 'Chlamys' mawsoni Fletcher from ÃŽles Kerguelen. The source rock accumulated in fully marine, highly current-affected conditions. The collection is dominated by right valves, possibly because left valves are more susceptible to breakage and the effects of current winnowing. The locality may have subsided some 500 m since deposition. It lies immediately north of a straight, north-east - south-west trending lineament which may mark a major tectonic feature with left-lateral displacement of approximately 50 km, and provides a natural boundary within the Central Province of Kerguelen Plateau.

History

Publication title

Antarctic Science

Volume

16

Pagination

329-338

ISSN

0954-1020

Department/School

School of Natural Sciences

Publisher

Cambridge University Press

Place of publication

UK

Repository Status

  • Restricted

Socio-economic Objectives

Climate variability (excl. social impacts)

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