Seafloor Spreading in the Tasman Sea

Hayes, Dennis E.; Ringis, J.

doi:10.1038/243454a0

Cited by 337 publications

(146 citation statements)

References 18 publications

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“…spreading centre in the Tasman Sea (Hayes and Ringis 1973), while the northeast-trending faults are subparallel to the transform faults associated with the spreading system. Thus these faults may be inherited from a pattern predating the emplacement of the Allochthon.…”

Section: Later Folding and Faultingmentioning

confidence: 98%

“…He postulated that the opening of the Tasman Sea by symmetrical spreading (Hayes and Ringis 1973) was accompanied by east-dipping subduction of the Indian plate beneath the Pacific plate, and that the sediments of the Allochthon accumulated in the accompanying trench. Eversion of the basin was caused by collision of the New Zealand continental block with the subduction zone and the resulting reversal of subduction polarity to the present westward dip.…”

Section: The Eversion Of the Basinmentioning

confidence: 99%

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Northland Allochthon

Ballance

Spörli

1979

Journal of the Royal Society of New Zealand

121

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Section: Later Folding and Faultingmentioning

confidence: 98%

Section: The Eversion Of the Basinmentioning

confidence: 99%

Northland Allochthon

Ballance

Spörli

1979

Journal of the Royal Society of New Zealand

121

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“…Evolution of the present topography may have been initiated by rifting between the Australian continent and the Lord Howe Rise 85-100 million years ago (Hayes and Ringis, 1973;Weissel and Hayes, 1977;Ollier, 1982;Wellman, 1987;Gilchrist and Summerfield, 1990;Seidl et al, 1996;O'Sullivan et al, 1999). The highland region of relatively low-relief is considered to have been subject to relatively slow erosion (B10 m Myr À1 ) (Ollier, 1978;Bishop, 1985;Bishop et al, 1985;Pain, 1985;Wellman, 1987;Bishop and Brown, 1992;Nott, 1992).…”

Section: Southeastern Australia Settingmentioning

confidence: 99%

Late Quaternary erosion in southeastern Australia: a field example using cosmogenic nuclides

Heimsath

Chappell

Dietrich

et al. 2001

Quaternary International

176

180

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Late Quaternary rates of apparent soil production, bedrock incision, and average erosion are determined for the southeastern highlands of Australia using in situ produced cosmogenic nuclide concentrations of 10 Be and 26 Al. Apparent soil production rates define a steep, inverse exponential function of soil depth with a maximum of 143 m Ma À1 under zero soil depth. There were no observed soil depths between about 25 cm and zero, however, such that the maximum observed rate is about 50 m Ma À1. The Bredbo River catchment average erosion rate is 1571 m Ma À1 , and is similar to the average hillslope erosion rate of 1671 m Ma À1 . Bedrock incision rates average 9 m Ma À1 and suggest that the higher rates of hillslope erosion may be in response to a pulse of incision, perhaps generated by knickpoint propagation. Bedrock erosion rates inferred from a tor profile average 3.8 m Ma À1 , with higher rates on other, more weathered tor tops. An aboveground tor profile of nuclide concentrations is consistent with a simple model of rapid stripping of the surrounding saprolite, supporting the view that at least one episodic period of increased denudation has affected the landscape evolution of the highlands. We test this hypothesis by using a simple landscape evolution model to reasonably predict the spatial variation of soil depth as well as the emergence of tors. r

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“…The TF may have migrated several degrees north during Pleistocene glacial intervals (Mart| ¤-nez, 1994;Kawagata, 2001). However, its average latitudinal position in the late Neogene was probably similar to that at present because the front is strongly in£uenced by the bathymetry of the Central Tasman Basin (Heath, 1985;Uddstrom and Oien, 1999) and this has been relatively stable for at least the past 15 million years (Myr) (Hayes and Ringis, 1973;Gaina et al, 1998). Site 590 is therefore ideally situated to monitor Miocene and Pliocene changes in oceanography at a frontal zone in the Southwest Paci¢c (Elmstrom and Kennett, 1986).…”

Section: Oceanographic Settingmentioning

confidence: 99%

Coupled productivity and carbon isotope records in the southwest Pacific Ocean during the late Miocene–early Pliocene biogenic bloom

Grant

Dickens

2002

Palaeogeography, Palaeoclimatology, Palaeoecology

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Biogenic components of sediment accumulated at high rates beneath frontal zones of the Indian and Pacific oceans during the late Miocene and early Pliocene. The N 13 C of bulk and foraminiferal carbonate also decreased during this time interval. Although the two observations may be causally linked, and signify a major perturbation in global biogeochemical cycling, no site beneath a frontal zone has independent records of export production and N 13 C on multiple carbonate phases across the critical interval of interest. Deep Sea Drilling Project (DSDP) site 590 lies beneath the Tasman Front (TF), an eddy-generating jetstream in the southwest Pacific Ocean. To complement previous N 13 C records of planktic and benthic foraminifera at this location, late Neogene records of CaCO 3 mass accumulation rate (MAR), Ca/Ti, Ba/Ti, Al/Ti, and of bulk carbonate and foraminiferal N 13 C were constructed at site 590. The N 13 C records include bulk sediment, bulk sediment fractions ( 6 63 Wm and 5^25 Wm), and the planktic foraminifera Globigerina bulloides, Globigerinoides sacculifer (with and without sac), and Orbulina universa. Using current time scales, CaCO 3 MARs, Ca/Ti, Al/Ti and Ba/Ti ratios are two to three times higher in upper Miocene and lower Pliocene sediment relative to overlying and underlying units. A significant decrease also occurs in all N 13 C records. All evidence indicates that enhanced export production^the 'biogenic bloom'^extended to the southwest Pacific Ocean between ca. 9 and 3.8 Ma, and this phenomenon is coupled with changes in N 13 C^the 'Chron C3AR carbon shift'. However, CaCO 3 MARs peak ca. 5 Ma whereas elemental ratios are highest ca. 6.5 Ma; foraminiferal N 13 C starts to decrease ca. 8 Ma whereas bulk carbonate N 13 C begins to drop ca. 5.6 Ma. Temporal discrepancies between the records can be explained by changes in the upwelling regime at the TF, perhaps signifying a link between changes in ocean^atmosphere circulation change and widespread primary productivity. ß

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Seafloor Spreading in the Tasman Sea

Cited by 337 publications

References 18 publications

Northland Allochthon

Northland Allochthon

Late Quaternary erosion in southeastern Australia: a field example using cosmogenic nuclides

Coupled productivity and carbon isotope records in the southwest Pacific Ocean during the late Miocene–early Pliocene biogenic bloom

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