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  • 1
    Electronic Resource
    Electronic Resource
    176Hf/177Hf Determination in Small Samples by a High-Temperature SIMS Technique (1994)
    s.l. : American Chemical Society
    Analytical chemistry 66 (1994), S. 4186-4189 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00095a012
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mineralogy of the mid-ocean-ridge basalt source from neodymium isotopic composition of abyssal peridotites (2002)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 418 (2002), S. 68-72 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Inferring the melting process at mid-ocean ridges, and the physical conditions under which melting takes place, usually relies on the assumption of compositional similarity between all mid-ocean-ridge basalt sources. Models of mantle melting therefore tend to be restricted to those that ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature00798
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  • 3
    Electronic Resource
    Electronic Resource
    Extraction of mid-ocean-ridge basalt from the upwelling mantle by focused flow of melt in dunite channels (1995)
    [s.l.] : Nature Publishing Group
    Nature 375 (1995), S. 747-753 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Like residual peridotites from mid-ocean ridges, peridotites from the mantle section of the Oman ophiolite are far from equilibrium with mid-ocean-ridge basalt (MORB). By contrast, dunites from Oman are close to equilibrium with MORB, indicating that they were conduits for ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/375747a0
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  • 4
    Electronic Resource
    Electronic Resource
    The hafnium paradox and the role of garnet in the source of mid-ocean-ridge basalts (1989)
    [s.l.] : Nature Publishing Group
    Nature 342 (1989), S. 420-422 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Patchett and co-workers5"7, "using hafnium isotopes to constrain geological processes, concluded that, in general, Hf isotopes in oceanic volcanics (MORB and OIB) are well correlated with Nd isotopes5. The Lu-Hf isotope system has therefore received only very limited attention in mantle studies. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/342420a0
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  • 5
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    Geochemistry of Walvis Ridge basalts
    PANGAEA
    In:  Supplement to: Salters, Vincent J M; Sachi-Kocher, Afi (2010): An ancient metasomatic source for the Walvis Ridge basalts. Chemical Geology, 273(3-4), 151-167, https://doi.org/10.1016/j.chemgeo.2010.02.010
    Details
    Publication Date: 2023-06-27
    Description: The proposed origins for the Enriched Mantle I component are many and various and some require an arbitrary addition of an exotic component, be it pure sediment or an enriched melt from the subcontinental lithosphere. With Pitcairn, Walvis Ridge is the 'type-locality' for the Enriched Mantle I (EMI) component. We analyzed basalts from DSDP Site 525A, Site 527 and Site 528 on the Walvis Ridge with the aim to constrain the history of its source. The isotopic compositions we measured for the three sites overlap with the values obtained by Richardson et al. (1982a) and extend towards less radiogenic Sr and more radiogenic Pb and Nd isotopic compositions. We used our new trace element and radiogenic isotope (Hf, Nd, Pb and Sr) characterization in combination with the literature data to produce the simplest possible model that satisfies the trace element and isotopic constraints. Although the elevated 207Pb/204Pb with respect to 206Pb/204Pb predicts an ancient origin for EMI, none of the proposed origins had modeled it as such. The data is consistent with the EMI composition being formed by the addition of a melt to a mantle with bulk Earth-like composition followed by melt extraction of a low degree melt. The timing of these two events is such that the metasomatism has to have taken place prior to 4 Ga and the subsequent melt removal before 3.5 Ga. This confirms the expectation of an ancient character for the EMI component. The Walvis Ridge data shows two distinct two component mixing trends: one formed by the less enriched Site 527 and Site 528 basalts and one formed by the Site 525A basalts. The two trends have the EMI endmember in common. The less depleted end of the Site 527-Site 528 basalts is FOZO-like and can be explained by the addition of a recycled component (basaltic oceanic crust plus sediment). This recycled component was altered during subduction. The sense and magnitude of the chemical fractionation resulting from the subduction alteration are in agreement with dehydration experiments on basalts and sediment. Compared to other EMI like basalts the Walvis Ridge basalts have flatter REE patterns and show less fractionation between large ion lithophile and heavy REE elements. Using the isotopic compositions as constrains for the parent-daughter ratios we were able to model the trace element patterns of the basalts as melting between 5 and 10% for Site 525A and between 10 and 15% for the depleted end of the Site 528-Site 527 array. In all cases a significant portion of melting takes place in the garnet stability field.
    Keywords: 74-525A; 74-527; 74-528; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg74; South Atlantic; South Atlantic/CREST; South Atlantic/RIDGE
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 6
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    (Table 1) Major element composition of basalts from DSDP Leg 74 holes
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 74-525A; 74-527; 74-528; Aluminium oxide; Calcium oxide; Calculated; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elements, total; Event label; Glomar Challenger; Iron oxide, Fe2O3; Leg74; Loss on ignition; Magnesium number; Magnesium oxide; Manganese oxide; Phosphorus pentoxide; Potassium oxide; Sample code/label; Silicon dioxide; Sodium oxide; South Atlantic; South Atlantic/CREST; South Atlantic/RIDGE; Titanium dioxide; X-ray fluorescence (XRF)
    Type: Dataset
    Format: text/tab-separated-values, 588 data points
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  • 7
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    (Table 3) Isotope ratios of basalts from DSDP Leg 74 holes
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 74-525A; 74-527; 74-528; Comment; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Glomar Challenger; Hafnium-176/Hafnium-177; Hafnium-176/Hafnium-177, error; Inductively coupled plasma - mass spectrometry (ICP-MS); Lead-206/Lead-204 ratio; Lead-207/Lead-204 ratio; Lead-208/Lead-204 ratio; Leg74; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, error; Sample code/label; Secondary ion mass spectrometry (SIMS); South Atlantic; South Atlantic/CREST; South Atlantic/RIDGE; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error; Thermal Ionization Mass Spectrometry (TIMS); ε-Hafnium; ε-Neodymium
    Type: Dataset
    Format: text/tab-separated-values, 349 data points
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  • 8
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    (Table 2) Trace element composition of basalts from DSDP Leg 74 holes (2010)
    PANGAEA
    Details
    Publication Date: 2023-07-10
    Keywords: 74-525A; 74-527; 74-528; Barium; Caesium; Cerium; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Dysprosium; Erbium; Europium; Event label; Gadolinium; Glomar Challenger; Hafnium; Holmium; Inductively coupled plasma - mass spectrometry (ICP-MS); Lanthanum; Lead; Leg74; Lithium; Lutetium; Neodymium; Niobium; Praseodymium; Rubidium; Samarium; Sample code/label; South Atlantic; South Atlantic/CREST; South Atlantic/RIDGE; Strontium; Tantalum; Terbium; Thorium; Uranium; Ytterbium; Yttrium; Zirconium
    Type: Dataset
    Format: text/tab-separated-values, 1161 data points
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  • 9
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    Particle flux from sediment trap PAP-XXVI (2010)
    PANGAEA
    Details
    Publication Date: 2023-11-10
    Keywords: 55002-002; Calcium carbonate, flux; Calculated; Carbon, inorganic, particulate, flux per day; Carbon, organic, particulate, flux; DATE/TIME; Date/time end; DEPTH, water; Duration, number of days; Event label; Flux of total mass; HERMIONE; Hotspot Ecosystem Research and Mans Impact On European Seas; Nitrogen, particulate, flux; PAP-XXVI; Porcupine Abyssal Plain; Sample code/label; Silica, particulate, flux per day; Trap, sediment; TRAPS
    Type: Dataset
    Format: text/tab-separated-values, 159 data points
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  • 10
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    Particle flux from sediment trap PAP-XXVII (2010)
    PANGAEA
    Details
    Publication Date: 2023-11-10
    Keywords: Calcium carbonate, flux; Calculated; Carbon, inorganic, particulate, flux per day; Carbon, organic, particulate, flux; DATE/TIME; Date/time end; DEPTH, water; Duration, number of days; Event label; Flux of total mass; HERMIONE; Hotspot Ecosystem Research and Mans Impact On European Seas; Nitrogen, particulate, flux; PAP-XXVII; Porcupine Abyssal Plain; Sample code/label; Silica, particulate, flux per day; Trap, sediment; TRAPS
    Type: Dataset
    Format: text/tab-separated-values, 164 data points
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