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  • 1990-1994  (4)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Nd and Sr isotope evidence linking mid-ocean-ridge basalts and abyssal peridotites (1994)
    [s.l.] : Nature Publishing Group
    Nature 371 (1994), S. 57-60 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Most studies of abyssal peridotite either assume a relationship with MORB, and thus cannot be used to demonstrate its existence11'12, or do not address this question at all13'14. The best evidence so far for this link comes from worldwide covariations in basalt and abyssal peridotite major-element ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/371057a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Evidence for hotspot-related carbonatite metasomatism in the oceanic upper mantle (1993)
    [s.l.] : Nature Publishing Group
    Nature 365 (1993), S. 221-227 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Four peridotite xenoliths from the islands of Savai'i (Western Samoa) and Tubuai (Austral Islands) contain primary olivine of lithospheric origin, and secondary assemblages of clinopyroxene + spinel ± apatite. The trace-element contents of the secondary minerals show that they formed in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/365221a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Osmium isotope ratios of PGM grains associated with the Freetown Layered Complex, Sierra Leone, and their origin (1991)
    Springer
    Contributions to mineralogy and petrology 109 (1991), S. 10-18 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Osmium isotope ratios for two types of platinum group mineral (PGM) nuggets of eluvial (residual) origin, associated with the Freetown Layered Gabbro Complex, were determined in-situ using an ion microprobe. The values for erlichmanite nuggets are ≈1.08. Those for PGM inclusions in Pt−Fe alloy nuggets are higher, ranging from 1.2 to 2.1. Ratios of187Os/186Os vary between the nuggets, but they are consistent within individual nuggest. The data suggest early formation of the erlichmanite nuggets, prior to a postulated substantial contribution of crustal Os. The Pt−Fe alloy nuggets, on the other hand, were formed later in a residual melt which was contaminated by crustal Os due to the assimilation (〈10%) or the gaseous/fluid transport of Os from Archaean host rocks into the magma. The lack of systematic mineralogical and chemical changes of the Complex and extensive granulitization in the adjacent host rocks and xenoliths may favor the latter process. The lack of high187Os/186Os ratios, consistent187Os/186Os values within individual nuggets and their textures and mineralogy suggest that the studied PGM nuggets were not formed during lateritization or in low-temperature depositional environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687197
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental cpx/melt partitioning of 24 trace elements (1993)
    Springer
    Contributions to mineralogy and petrology 113 (1993), S. 1-8 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Cpx/melt partition coefficients have been determined by ion probe for 24 trace elements at natural levels in an alkali basalt experimentally equilibrated at 1,380°C and 3 GPa. One goal was to intercompare Ds for both high-field-strength elements and rare earth elements (REE) in a single experiment. Relative to the REE spidergram, Hf and Ti show virtually no anomaly, whereas Zr exhibits a major negative anomaly. Other incompatible elements (Ba, K, Nb) fall in the range of published values, as do elements such as Sr, Y, Sc, Cr and V. Pb shows a value intermediate between La and Ce. Values for Be, Li and Ga are reported for the first time, and show that Be is as incompatible as the light REEs whereas Li and Ga are somewhat more compatible than the heavy REE.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00320827
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    Paper (German National Licenses)
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