Browsing by Author "Jacobsen S.B."
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Browsing by Author "Jacobsen S.B."
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Yin Q.Z.; Jacobsen S.B.; Lee C.T.; McDonough W.F.; Rudnick R.L.; Horn I. (2001)The Re-Os isotopic system is currently limited as a chronometer because of the lack of accurate gravimetric standards for Os spike calibration and uncertainty of the 187Re half-life, which is also dependent on the accuracy ...
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Harper C.L.; Jacobsen S.B. (1996)We present evidence from tungsten (W) isotopic measurements consistent with the presence of live 182Hf (T1 = 9 Ma) in the early solar system. This is based on the observation of a well-resolved deficit of about four parts ...
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Kaufman A.J.; Knoll A.H.; Semikhatov M.A.; Grotzinger J.P.; Jacobsen S.B.; Adams W. (1996)Carbonate-rich sedimentary rocks of the western Anabar region, northern Siberia, preserve an exceptional record of evolutionary and biogeochemical events near the Proterozoic/Cambrian boundary. Sedimentologically, the ...
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Kellogg J.B.; Jacobsen S.B.; O'Connell R.J. (2002)We present an extension of the conventional geochemical reservoir model for the evolution of the Earth's crust-mantle system in which we calculate not only the mean isotopic ratios, but also the distribution of those ratios ...
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Jacobsen S.B.; Kaufman A.J. (1999)Sr and C isotopic data obtained on stratigraphic suites of well-preserved marine limestone from Siberia, Namibia, Canada, Svalbard and East Greenland provide a relatively detailed first-order record of isotopic variation ...
Now showing items 1-5 of 5