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    Carbonate shelf sediments of the western continental margin of Australia

    Access Status
    Fulltext not available
    Authors
    Collins, Lindsay
    Jahnert, Ricardo
    Date
    2014
    Type
    Book Chapter
    
    Metadata
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    Citation
    Collins, L. and James, N. and Bone, Y. 2014. Carbonate shelf sediments of the western continental margin of Australia. In F.L. Chiocchi, A.R. Chivas (ed), Continental Shelves of the World: Their Evolution During the Last Glacio-Eustatic Cycle. Memoirs, vol. 41, pp. 255-272. The Geological Society of London.
    Source Title
    The Geological Society of London
    DOI
    10.1144/M41.19
    ISBN
    9781862396869
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/38166
    Collection
    • Curtin Research Publications
    Abstract

    Australia's western margin is adjacent to a low–moderate-relief, semi-arid hinterland extending from northern tropical to southern temperate latitudes. Swell waves occur throughout, and cyclonic storms and tidal influences decline from north to south. The margin is influenced by the poleward-flowing, warm, nutrient-poor Leeuwin Current. There is limited upwelling and localized downwelling of saline water on to the shelf. The North West Shelf (NWS) is an ocean-facing ramp with palimpsest sediments – formed during Marine Isoptope Stage (MIS) 3 and 4; stranded ooids and peloids formed early during the post-Last Glacial Maximum (LGM) sea-level rise – and Holocene particles. Changing oceanography during sea-level rise profoundly affected sediment character.The SW Shelf (SWS) comprises the subtropical sediment-starved Carnarvon Ramp in the north and the incipiently rimmed, flat-topped, steep-fronted Rottnest Shelf in the south. The inner Carnarvon Ramp includes the Ningaloo Reef and hypersaline Shark Bay. The mid ramp is relict or stranded foraminifer-dominated sand, and represents attenuated carbonate production due to downwelling incursions of Shark Bay water on to the ramp; the outer ramp is planktic foraminiferal sand or spiculitic mud. Rottnest Shelf has coralline algal-encrusted hardgrounds, larger symbiont-bearing foraminifers with abundant cool-water elements including bryzoans, molluscs and smaller foraminifers. The SWS is transitional between warm- and cool-water carbonate realms.

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