Browsing by Author "Walker R.J."
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Browsing by Author "Walker R.J."
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Walker R.J.; Morgan J.W.; Hanski E.J.; Smolkin V.F. (1997)The Re-Os isotopic systematics of various ferropicritic flows and sills of the Pechenga Complex, Russia, have been examined. During crystallization about 1.98 Ga ago, many of these bodies became highly differentiated. In ...
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Becker H.; Morgan J.W.; Walker R.J.; MacPherson G.J.; Grossman J.N. (2001)The Re-Os isotopic systematics of calcium-aluminium-rich inclusions (CAIs) in chondrites were investigated in order to shed light on the behavior of the Re-Os system in bulk chondrites, and to constrain the timing of ...
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McDaniel D.K.; Walker R.J.; Hemming S.R.; Horan M.F.; Becker H.; Grauch R.I. (2004)High precision Os isotope analysis of young marine manganese nodules indicate that whereas the composition of modern seawater is radiogenic with respect to 187Os/188Os, it has 186Os/188Os that is within uncertainty of the ...
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Brandon A.D.; Walker R.J. (2005)Some hotspot volcanism is likely the surface manifestation of hot upwelling mantle plumes that rise from the core–mantle boundary (CMB) or from compositional boundaries within the mantle. Plumes that rise from the CMB may ...
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Shirey S.B.; Walker R.J. (1998)The Re-Os isotope sytem, based on the long-lived β − transition of 187 Re to 187 Os, has matured to wide use in cosmochemistry and high-temperature geochemistry. The siderophilic/chalcophilic behavior of Re and Os is ...
Now showing items 21-25 of 25