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First record of contourites from Lower Devonian Liptrap Formation in southeast Australia
Typical contourite deposits associated with submarine turbidite fan deposits are recognized for the first time from the Lower Devonian Liptrap Formation at Cape Liatrap, Victoria in southeast Australia. The contourites are well integrated within the turbidite fan deposits and are characterized by thin (5–8 cm), lenticular, well-sorted coarse-grained siltstones to fine-grained sandstones with current-ripples and cross beddings. The palaeocurrent directions of the turbidite fan and contourites are perpendicular to each other, with the former directed generally westward while the latter varying from 165° to 190° southward. In view of the facies types and architecture, we suggest that the turbidite fan was developed at the base of a westward inclined palaeo-slope, at the front of which the contourites were deposited as a result of southward flowing deep-sea contour (geostrophic) currents. The depositional setting interpreted for the Liptrap Formation thus may provide a provisional model for the Lower Devonian continental slope and abyssal basin environment in the southeastern part of the Melbourne Trough.
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Journal
Science in China: Series D Earth sciencesVolume
51Issue
7Pagination
939 - 946Publisher
Zhongguo Kexue ZazhisheLocation
Beijing, ChinaPublisher DOI
ISSN
1006-9313eISSN
1862-2801Language
engPublication classification
C1 Refereed article in a scholarly journal; C Journal articleCopyright notice
2008, Science in China PressUsage metrics
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