Evolution of Nd and Pb isotopes in Central Pacific seawater from ferromanganese crusts

Ling, Hong‐Fei; Burton, K. W.; O’Nions, R.K.; Kamber, Balz S.; Blanckenburg, Friedhelm von; Gibb, A.J.; Hein, James R.

doi:10.1016/s0012-821x(96)00224-5

Cited by 224 publications

(186 citation statements)

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“…On the basis of such studies, it was shown that the deepwater of the three main oceanic basins of the Atlantic, Indian, and Pacific were also compositionally distinct during the Oligo-Miocene [e.g., Ling et al, 1997;O'Nions et al, 1998;Burton et al, 1999] and that the Nd isotope compositions of ancient seawater are useful tracers of changes in oceanic circulation, including the opening and closing of gateways to seawater circulation, and/or in estimating continental inputs and mixing of different water masses [e.g., Burton et al, 1997;Frank et al, 1999;Scher and Martin, 2006].…”

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confidence: 99%

Oceanographic and climatic evolution of the Miocene Mediterranean deduced from Nd, Sr, C, and O isotope compositions of marine fossils and sediments

et al. 2008

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[1] Isotopic compositions of marine sediments and fossils have been investigated from northern basins of the Mediterranean to help constrain local oceanographic and climatic changes adjacent to the uplifting Alps. Stable C and O isotope compositions of benthic and planktonic foraminifera from the Umbria-Marche region (UMC) have an offset characteristic for their habitats and the changes in composition mimic global changes, suggesting that the regional conditions of climate and the carbon cycle were controlled by global changes. The radiogenic isotope composition of these fossil assemblages allows recognition of three distinct periods. In the first period, from 25 to 19 Ma, high e Nd values and low 87 Sr/ 86 Sr of sediments and fossils support intense tectonism and volcanism, related to the opening of the western Mediterranean. In the second period, from 19 to 13 Ma the 87 Sr/ 86 Sr ratio of Mediterranean (UMC) deviate from the global ocean, which is compatible with rapid uplift of the hinterland and intense influx of Sr from Mesozoic carbonates of the western Apennines. This local control on the seawater was driven by a humid and warm climate and indicates restricted exchange of water with the global ocean. Generally, the e Nd values of the fossils are very similar to those of Indian Ocean water, with brief periods of a decrease in the e Nd values coinciding with volcanic events and maybe sea level variation at 15.2 Ma. In the third period, from 13 to 10 Ma the fossils have 87 Sr/ 86 Sr similar to those of Miocene seawater while their e Nd values change considerably with time. This indicates fluctuating influence of the Atlantic versus the Paratethys and/or locally evolved seawater in the Mediterranean driven by global sea level changes. Other investigated localities near the Alps and from the ODP 900 site are compatible with this oceanographic interpretation. However, in the late early Miocene, enhanced local control, reflecting erosion of old crustal silicate rocks near the Alps, results in higher 87 Sr/ 86 Sr.Citation: Kocsis, L., T.

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confidence: 99%

Oceanographic and climatic evolution of the Miocene Mediterranean deduced from Nd, Sr, C, and O isotope compositions of marine fossils and sediments

et al. 2008

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“…ferromanganese crusts, have been proven a useful tracer to monitor the pattern of ocean circulation [6][7][8][9][10][11][12]. The average residence time of Nd in the global ocean (~300 to ~600 a) which is shorter than the ocean mixing time (~1500 a) prevents its complete homogenization and makes Nd isotopic signals of different water masses distinguishable throughout the ocean [8,13].…”

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confidence: 99%

“…The average residence time of Nd in the global ocean (~300 to ~600 a) which is shorter than the ocean mixing time (~1500 a) prevents its complete homogenization and makes Nd isotopic signals of different water masses distinguishable throughout the ocean [8,13]. In the deep North Pacific, although Nd [6], Tasman [19]) and the schematically major currents in this area [5,20]. Also shown is a modern seawater profile TPS24 271-1 [14].…”

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confidence: 99%

“…Also shown is a modern seawater profile TPS24 271-1 [14]. isotopic compositions vary within a small range, they are far from homogenous, making Nd isotopes still a powerful tool to trace both modern and ancient water masses [6,[14][15][16]. The ferromanganese crusts widely distributed in central and North Pacific are good archives to record past and presentday deep ocean circulation.…”

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confidence: 99%

“…Ling et al [6,9] found that  Nd values of crusts gradually increased with time based on analyses of Nd isotopic composition of several ferromanganese crusts in central North Pacific, indicating the increasing influence of more radiogenic Nd from arc source.  Nd values of crusts have increased significantly especially from the past 15 Ma, but the cause of the change is not fully unclosed yet.…”

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Late Cenozoic history of deep water circulation in the western North Pacific: Evidence from Nd isotopes of ferromanganese crusts

Chen

2012

Chin. Sci. Bull.

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Nd isotopic structure of the Pacific Ocean 70–30 Ma and numerical evidence for vigorous ocean circulation and ocean heat transport in a greenhouse world

et al. 2014

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The oceanic meridional overturning circulation (MOC) is a crucial component of the climate system, impacting heat and nutrient transport, and global carbon cycling. Past greenhouse climate intervals present a paradox because their weak equator-to-pole temperature gradients imply a weaker MOC, yet increased poleward oceanic heat transport appears to be required to maintain these weak gradients. To investigate the mode of MOC that operated during the early Cenozoic, we compare new Nd isotope data with Nd tracer-enabled numerical ocean circulation and coupled climate model simulations. Assimilation of new Nd isotope data from South Pacific Deep Sea Drilling Project and Ocean Drilling Program Sites 323, 463, 596, 865, and 869 with previously published data confirm the hypothesized MOC characterized by vigorous sinking in the South and North Pacific~70 to 30 Ma. Compilation of all Pacific Nd isotope data indicates vigorous, distinct, and separate overturning circulations in each basin until~40 Ma. Simulations consistently reproduce South Pacific and North Pacific deep convection over a broad range of conditions, but cases using strong deep ocean vertical mixing produced the best data-model match. Strong mixing, potentially resulting from enhanced abyssal tidal dissipation, greater interaction of wind-driven internal wave activity with submarine plateaus, or higher than modern values of the geothermal heat flux enable models to achieve enhanced MOC circulation rates with resulting Nd isotope distributions consistent with the proxy data. The consequent poleward heat transport may resolve the paradox of warmer worlds with reduced temperature gradients.

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Evolution of Nd and Pb isotopes in Central Pacific seawater from ferromanganese crusts

Cited by 224 publications

References 51 publications

Oceanographic and climatic evolution of the Miocene Mediterranean deduced from Nd, Sr, C, and O isotope compositions of marine fossils and sediments

Oceanographic and climatic evolution of the Miocene Mediterranean deduced from Nd, Sr, C, and O isotope compositions of marine fossils and sediments

Late Cenozoic history of deep water circulation in the western North Pacific: Evidence from Nd isotopes of ferromanganese crusts

Nd isotopic structure of the Pacific Ocean 70–30 Ma and numerical evidence for vigorous ocean circulation and ocean heat transport in a greenhouse world

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