Carbonate mud sedimentation on a temperate shelf: Bass Basin, southeastern Australia

Blom, Wilma M.; Alsop, D. B.

doi:10.1016/0037-0738(88)90124-8

Cited by 47 publications

(33 citation statements)

References 9 publications

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“…Several large fields of sandwaves are evident at water depths of 40 to 46 m in and around the islands of Bass Strait (Malikides et al, 1988 Blom & Alsop, 1988, Jones & Davies, 1983 remains of mollusks, bryozoans, and echinoderms. They appear to be modern active bedforms with ripples, crest megaripples, trough megaripples, and sandwaves present on their surface (Malikides et al, 1988).…”

Section: Sedimentary Environmentsmentioning

confidence: 95%

“…Mud is present on the sea floor in Bass Strait at depths of 44 to 90 m. According to Blom and Alsop (1988), calcitic muds are now accumulating in the central part of the basin at 75 to 80 m of water depth over an area of 20,000 km 2 . The calcitic muds are a product of the remains of nanoplankton (coccoliths) as well as skeletal carbonate grains.…”

Section: Sedimentary Environmentsmentioning

confidence: 99%

“…The calcitic muds are a product of the remains of nanoplankton (coccoliths) as well as skeletal carbonate grains. Depositional rates are < 12 cm per 1,000 years in the basin center but decrease to < 6 cm per 1,000 years around the margin (Blom & Alsop, 1988).…”

Section: Sedimentary Environmentsmentioning

confidence: 99%

“…Sea floor investigations have been undertaken (Blom & Alsop, 1988;Jones & Davies, 1983) along with reconnaissance sampling of benthic and demersal populations (Wilson & Poore, 1987). Sediments on the sea floor are largely sand, but silt and clay dominate the central part of Bass Strait and deeper waters of the Gippsland Shelf (Wilson & Poore, 1987).…”

Section: Location and Settingmentioning

confidence: 99%

See 3 more Smart Citations

Marine environments of Southeast Australia (Gippsland Shelf and Bass Strait) and the impact of offshore petroleum exploration and production activity

Lavering

1994

Marine Georesources & Geotechnology

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Section: Sedimentary Environmentsmentioning

confidence: 95%

Section: Sedimentary Environmentsmentioning

confidence: 99%

Section: Sedimentary Environmentsmentioning

confidence: 99%

Section: Location and Settingmentioning

confidence: 99%

See 2 more Smart Citations

Marine environments of Southeast Australia (Gippsland Shelf and Bass Strait) and the impact of offshore petroleum exploration and production activity

Lavering

1994

Marine Georesources & Geotechnology

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“…We predicted that C. longicollis would be insensitive to this freshwater bioregional boundary as the region is characterised by open lowlands, a habitat type over which gene flow should readily occur. Further, high population connectivity in C. longicollis is expected to have dominated this region during the last glacial cycle owing to the presence of the freshwater Lake Bass on the Pleistocene land-bridge between south-east Australia and the island of Tasmania (Blom and Alsop 1988). Unmack et al (2012) suggest that divergence between the Bass Province and the Eastern Province in fish populations may have been maintained during Pleistocene aridity by limited floodplain connectivity surrounding Lake Bass and potentially high salinities in the lake itself.…”

Section: Phylogeographic Break Between the Bass Province And The Eastmentioning

confidence: 98%

Significant genetic structure despite high vagility revealed through mitochondrial phylogeography of an Australian freshwater turtle (Chelodina longicollis)

Hodges

Donnellan

Georges

2015

Mar. Freshwater Res.

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Restriction to the freshwater environment plays a dominant role in the population genetic structure of freshwater fauna. In taxa with adaptations for terrestriality, however, the restrictions on dispersal imposed by drainage divides may be overcome. We investigate the mitochondrial phylogeographic structure of the eastern long-necked turtle (Chelodina longicollis), a widespread Australian freshwater obligate with strong overland dispersa\l capacity and specific adaptations to terrestriality. We predict that such characteristics make this freshwater species a strong candidate to test how life-history traits can drive gene flow and interbasin connectivity, overriding the constraining effects imposed by hydrological boundaries. Contrary to expectations, and similar to low-vagility freshwater vertebrates, we found two ancient mitochondrial haplogroups with clear east-west geographic partitioning either side of the Great Dividing Range. Each haplogroup is characterised by complex genetic structure, demographically stable subpopulations, and signals of isolation by distance. This pattern is overlaid with signatures of recent gene flow, likely facilitated by late Pleistocene and ongoing anthropogenic landscape change. We demonstrate that the divergent effects of landscape history can overwhelm the homogenising effects of life-history traits that connect populations, even in a highly vagile species.

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Hardened faecal pellets as a significant component in deep water, subtropical marine environments

Deik

Reuning

Petrick

et al. 2019

The Depositional Record

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Non‐skeletal carbonate grains are classically interpreted to form in shallow, tropical environments. Peloids deposited in deep, subtropical marine conditions are poorly studied. IODP site U1460 on the subtropical Carnarvon Ramp (Southwest Shelf of Australia) recovered a nearly continuous Pliocene to Recent record of outer shelf and slope sediments. The relative abundance of peloids varies between 0% and 67% of the fine to medium sand fraction, and contributes on average ~4% of all grains. The origin and composition of these peloids were investigated using scanning electron microscopy equipped with an energy‐dispersive X‐ray spectrometer, light microscopy, X‐ray diffraction and stable isotope analysis. The peloids have a uniform size and shape and are interpreted as faecal pellets. They are mainly composed of skeletal fragments such as ascidian spicules, planktic foraminifera and sponge spicules in a mud‐sized matrix containing abundant coccolith plates. Mineralogical analysis show that the pellets consist of aragonite, calcite and dolomite. The pellets have an identical mineralogical composition and skeletal assemblage as the surrounding matrix, indicating that they have formed in situ. They occur more abundantly during interglacials when the site was situated in deeper waters below the swell wave base, presumably because the pellets were protected from disintegration and therefore available for cementation. The presence of framboidal pyrite within the pellets indicates bacterial sulphate reduction (BSR). The reduction of iron by hydrogen sulphide produced during BSR decreases the pH and likely explains the observed aragonite dissolution. Aragonite dissolution likely increases the alkalinity, and in consequence causes the precipitation of calcite and dolomite cements. It is suggested here that pellets are hardened due to this early cementation close to the sea floor increasing the potential for preservation in the fossil record.

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Carbonate mud sedimentation on a temperate shelf: Bass Basin, southeastern Australia

Cited by 47 publications

References 9 publications

Marine environments of Southeast Australia (Gippsland Shelf and Bass Strait) and the impact of offshore petroleum exploration and production activity

Marine environments of Southeast Australia (Gippsland Shelf and Bass Strait) and the impact of offshore petroleum exploration and production activity

Significant genetic structure despite high vagility revealed through mitochondrial phylogeography of an Australian freshwater turtle (Chelodina longicollis)

Hardened faecal pellets as a significant component in deep water, subtropical marine environments

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