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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

Lead isotope evidence for young trace element enrichment in the oceanic upper mantle

Article Abstract:

The isotopic composition of lavas from several central Atlantic islands are probably associated with the uranium/lead (U/Pb) fractionation that took place while the local oceanic lithosphere was being formed. Analysis of neodymium, strontium and lead isotope levels from Madeira, Trinidade and elsewhere suggest also that the U/Pb fractionation probably happened at shallow depths of the mantle adjacent to the spreading mid-ocean ridge. These regions of influx from the mantle have been highly stable.

Author: Halliday, Alex N., Davies, Gareth R., Der-Chuen Lee, Tommasini, Simone, Paslick, Cassi R., Fitton, J. Godfrey, James, Dodie E.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
Earth, Mantle (Geology)

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Thallium isotopic evidence for ferromanganese sediments in the mantle source of Hawaiian basalts

Article Abstract:

Hawaiian picrites with osmium isotope anomalies exhibit pronounced thallium isotope variations and caesium/thallium ratios with values far lower than commonly observed for mantle-derived rocks. A sedimentary origin for the osmium isotope anomalies is inferred and implies a core-mantle interaction as a feasible explanation for the osmium isotope variations of the Hawaiian picrites.

Author: Rehkamper, Mark, Halliday, Alex N., Norman, Marc D., Nielsen, Sune G., Harrison, Darrell
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
Hawaii, Mineralogical research

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Inside the cosmic blender

Article Abstract:

The geochemists discuss the Solar System's isotopic composition which has tantalizing small variations. They are investigating the mechanisms and types of the stars producing these variations.

Author: Halliday, Alex N.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2003
Research and Development in the Physical, Engineering, and Life Sciences, Switzerland, All Other Basic Inorganic Chemical Manufacturing, CHEMICALS AND ALLIED PRODUCTS, Earth Sciences, Isotopes, Solar system, Composition, Stars, Properties

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Subjects list: Research, Geochemistry, Isotope geology
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