Late Quaternary ostracod and planktonic foraminiferal dissolution signals from the eastern Tasman Sea — palaeoenvironmental implications

Swanson, Kerry; Lingen, G. van der

doi:10.1016/s0031-0182(97)00008-4

Cited by 10 publications

(3 citation statements)

References 18 publications

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“…11E,F) could be the result of recrystallisation of the ostracod calcite, rather than the dissolution of nannofossil calcite. While ostracods from Tasman Sea sites nearer to New Zealand do show signs of dissolution (Swanson & van der Lingen 1997), these sites are influenced by "coastal" upwelling systems (Bradford & Roberts 1978). Although ostracods are more prone to dissolution than foraminifera (Swanson & van der Lingen 1997), they only contribute in minor quantities to the sand fraction in Hole 593, and any dissolution is considered to have had a minor effect on the grain-size variations reported here.…”

Section: Dissolution and Diagenesismentioning

confidence: 65%

Textural variations in Neogene pelagic carbonate ooze at DSDP Site 593, southern Tasman Sea, and their paleoceanographic implications

Cooke¹,

Nelson

Crundwell

et al. 2004

New Zealand Journal of Geology and Geophysics

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Changes in Neogene sediment texture in pelagic carbonate-rich oozes on the Challenger Plateau, southern Tasman Sea, are used to infer changes in depositional paleocurrent velocities. The most obvious record of textural change is in the mud: sand ratio. Increases in the sand content are inferred to indicate a general up-core trend towards increasing winnowing of sediments resulting from increasing flow velocity of Southern Component Intermediate Water (SCIW), the forerunner of Antarctic Intermediate Water. In particular, the intervals c. 19-14.5 Ma, c. 9.5-8 Ma, and after 5 Ma are suggested to be times of increased SCIW velocity and strong sediment winnowing. Within the mud fraction, the fine silt to coarse clay sizes from 15.6 to 2 µm make the greatest contribution to the sediments and are composed of nannofossil plates. During extreme winnowing events it is the fine silt to very coarse clay material (13-3 µm) within this range that is preferentially removed, suggesting the 10 µm cohesive silt boundary reported for siliciclastic sediments does not apply to calcitic skeletal grains. The winnowed sediment comprises coccolithophore placoliths and spheres, represented by a mode at 4-7 µm.Further support for seafloor winnowing is gained from the presence in Hole 593 of a condensed sedimentary section from c. 18 to 14 Ma where the sand content increases to c. 20% of the bulk sample. Associated with the condensed section is a 6 m thick orange unit representing sediments subjected to particularly oxygen-rich, late early to early middle Miocene SCIW. Together these are inferred to indicate increased SCIW velocity resulting in winnowed sediment associated with faster arrival of oxygen-rich surface water subducted to form SCIW. Glacial development of Antarctica has been recorded from many deep-sea sites, with extreme glacials providing the mechanism to increase watermass flow. Miocene glacial zones Mi1b-Mi6 are identified in an associated oxygen isotope record from Hole 593, and correspond with times of particularly invigorated paleocirculation, bottom winnowing, and sediment textural changes.

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Section: Dissolution and Diagenesismentioning

confidence: 65%

Textural variations in Neogene pelagic carbonate ooze at DSDP Site 593, southern Tasman Sea, and their paleoceanographic implications

Cooke¹,

Nelson

Crundwell

et al. 2004

New Zealand Journal of Geology and Geophysics

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“…Ostracodes from New Zealand and its surrounding seas have been investigated since the nineteenth century (e.g., Brady, 1866Brady, , 1880Brady, , 1898. Most of the research is systematic descriptions (Hornibrook, 1952;Swanson, 1969Swanson, , 1980Ayress, 1990Ayress, , 1993Ayress, , 1995Ayress and Swanson, 1991;Milhau, 1993;Swanson and Ayress, 1999;Guise, 2001), assemblages and their distribution in the modern seas and bays (Swanson, 1979a(Swanson, , 1979bHayward, 1981Hayward, , 1982Ayress et al, 1997;Eager, 1999;Hayward, 2007, 2012), and paleoenvironments during the Miocene (Milhau, 1991) and the late Quaternary (Swanson and van der Lingen, 1997;Hayward et al, 2008). On the other hand, few fossil ostracode data for the Pliocene and early and middle Pleistocene have been reported in and around New Zealand.…”

Section: Introductionmentioning

confidence: 99%

Data report: temporal change in fossil ostracode assemblages in the PlioceneHolocene strata of shelf IODP Site U1354 off the eastern coast of New Zealand

Nakamura,

Kusunoki,

Yamada

et al. 2015

Proceedings of the IODP

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High-resolution analysis of fossil ostracode assemblages was performed in Pliocene to Holocene sections from Integrated Ocean Drilling Program Expedition 317 Site U1354 (water depth = 113 m), located on the continental shelf of the Canterbury Basin off New Zealand. In addition, samples from near the seafloor at Sites U1353 (water depth = 85 m), U1351 (122 m), and U1352 (344 m) were used to identify recent ostracode assemblages in the study area. At least 149 species and 60 genera of fossil ostracodes were identified from 142 core samples from Holes U1354B and U1354C, and many of them still inhabit the modern continental shelf around New Zealand and Australia.

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“…Sedimentos carbonáticos acumulados em profundidades muito mais rasas do que a lisoclina também estão sujeitos à dissolução (Berger, 1968;Swanson & van der Lingen, 1997;de Villiers, 2005).…”

Section: Fragmentaçãounclassified

Caracterização paleoceanográfica de um testemunho da Baía de Santos com base em foraminíferos planctônicos durante o Holoceno

Santarosa¹

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Late Quaternary ostracod and planktonic foraminiferal dissolution signals from the eastern Tasman Sea — palaeoenvironmental implications

Cited by 10 publications

References 18 publications

Textural variations in Neogene pelagic carbonate ooze at DSDP Site 593, southern Tasman Sea, and their paleoceanographic implications

Textural variations in Neogene pelagic carbonate ooze at DSDP Site 593, southern Tasman Sea, and their paleoceanographic implications

Data report: temporal change in fossil ostracode assemblages in the PlioceneHolocene strata of shelf IODP Site U1354 off the eastern coast of New Zealand

Caracterização paleoceanográfica de um testemunho da Baía de Santos com base em foraminíferos planctônicos durante o Holoceno

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Late Quaternary ostracod and planktonic foraminiferal dissolution signals from the eastern Tasman Sea — palaeoenvironmental implications

Cited by 10 publications

References 18 publications

Textural variations in Neogene pelagic carbonate ooze at DSDP Site 593, southern Tasman Sea, and their paleoceanographic implications

Textural variations in Neogene pelagic carbonate ooze at DSDP Site 593, southern Tasman Sea, and their paleoceanographic implications

Data report: temporal change in fossil ostracode assemblages in the PlioceneHolocene strata of shelf IODP Site U1354 off the eastern coast of New Zealand

Caracterização paleoceanográfica de um testemunho da Baía de Santos com base em foraminíferos planctônicos durante o Holoceno

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Data report: temporal change in fossil ostracode assemblages in the PlioceneHolocene strata of shelf IODP Site U1354 off the eastern coast of New Zealand