Results 1 to 10 of about 10,676 (301)
A Re—Os isotope study of ultramafic xenoliths from the Matsoku kimberlite
Earth and Planetary Science Letters, 1997 Ultramafic xenoliths erupted within the Matsoku kimberlite pipe display a range of petrographic features that have been interpreted as the products of melt injection or infiltration and metasomatic processes. We have analysed Re and Os concentrations and the Os isotope composition of these samples with the aim of investigating how such processes affect
V. Olive, R.M. Ellam, B. Harte
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The Re‐Os Isotopic System: A Review of Analytical Techniques
Geostandards Newsletter, 2002Over the past twenty years, successive technological advances have transformed the Re‐Os isotopic system into one of the most powerful tools in isotope geochemistry. We present here a brief historical review of these advances and then describe and compare the methods most commonly used today.
Reisberg, Laurie, Meisel, Thomas
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Re–Os elemental and isotopic systematics in crude oils
Geochimica et Cosmochimica Acta, 2007Analysis of 12 worldwide oil samples show that Re and Os abundances are positively correlated with the asphaltene content of oil. Light oils with 83%), with
David Selby +2 more
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Interpreting ages from Re–Os isotopes in peridotites
Lithos, 2009Abstract Since the first application of the 187Re–187Os isotope system to determine the timing of melt extraction from peridotites twenty years ago, a plethora of studies have demonstrated its usefulness in dating melt depletion, hence, lithosphere formation in continental settings. However, these studies have also highlighted issues that affect this
Roberta L. Rudnick, Richard J. Walker
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Re-Os isotope systematics of sediments of the Brahmaputra River system
Geochimica et Cosmochimica Acta, 2003Re-Os analyses were performed on suspended loads and coarser grained bank sediments of the Brahmaputra River system. Re and Os concentrations of these sediments vary from 7 to 1154 ppt and from 3 to 173 ppt, respectively. 187Os/188Os ratios range from 0.178 to 6.8, and thus vary from nearly mantle to very radiogenic crustal values.
Singh, Sunil +2 more
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Re-Os isotopic evidence for early differentiation of the Martian mantle
Geochimica et Cosmochimica Acta, 2000Variations in the short-lived systems of 182Hf-182W and 146Sm-142Nd in the SNC meteorites indicate an early isolation of, and subsequent inefficient mixing between, mantle reservoirs in Mars. Correlations of eW and e142Nd with initial γOs are consistent with the Re-Os isotopic systematics of these meteorites being set during the earliest ...
A.D. Brandon +3 more
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Re‐Os Isotopic Measurements at the Femtomole Level in Natural Samples
Geostandards Newsletter, 1997Here we describe a new chemical separation method for Os and an improved mass spectrometric procedure for Re and Os. This technique is based on the selective extraction of OsO4 from aqueous solution in liquid bromine. Among other advantages, this procedure avoids the cumbersome distillation procedure for Os and uses only commercial “off the shelf” PFA ...
Jean Louis Birck +2 more
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The Aguablanca Ni-Cu Deposit: A Re-Os Isotope Study
International Geology Review, 2008The Aguablanca Ni-Cu ore deposit is hosted by subvertical magmatic breccia bodies in which fragments of pyroxenite are cemented by sulfides. It is located within the Aguablanca Stock, which includes diorite, gabbro, norite and gabbronorite. Re-Os isotope data of magmatic pyrrhotite, chalcopyrite, and pentlandite and hydrothermal pyrite show that the Os
Ryan Mathur +2 more
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Re–Os isotopic evidence for a lower crustal origin of massif-type anorthosites
Nature, 2000Massif-type anorthosites are large igneous complexes of Proterozoic age. They are almost monomineralic, representing vast accumulations of plagioclase with subordinate pyroxene or olivine and Fe-Ti oxides--the 930-Myr-old Rogaland anorthosite province in southwest Norway represents one of the youngest known expressions of such magmatism.
, Schiellerup +5 more
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High precision Re-Os isotopic dating of molybdenites
Molybdenite is an ideal mineral for Re-Os isotopic dating, and its Re-Os isotopic systematics are widely employed to constrain the timing of hydrothermal metal mineralization.Xiaorui Fan +4 more
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