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

Published online by Cambridge University Press:  28 September 2004

PATRICK G. QUILTY ,
COLIN V. MURRAY-WALLACE  and
JASON M. WHITEHEAD
PATRICK G. QUILTY
Affiliation:
School of Earth Sciences, University of Tasmania, Private Box 79, Hobart, TAS 7001, Australia, [email protected]
COLIN V. MURRAY-WALLACE
Affiliation:
School of Earth and Environmental Sciences, University of Wollongong, NSW 2522, Australia
JASON M. WHITEHEAD
Affiliation:
Institute of Antarctic and Southern Ocean Studies (IASOS), University of Tasmania, Private Bag 77, Hobart, TAS 7001, Australia
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Abstract

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 Îles 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.

Keywords

amino acid datingbivalvediatomsNeogenePectinidaetectonics
Type
Research Article
Information
Antarctic Science , Volume 16 , Issue 3 , September 2004 , pp. 329 - 338
Copyright
© Antarctic Science Ltd 2004

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