Browsing by Author "Jochum K.P."
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Browsing by Author "Jochum K.P."
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Jochum K.P.; Hofmann A.W. (1997)We have analyzed Sb in a variety of mantle-derived volcanic rocks, peridotites, and in the CI chondrite Orgueil by spark source mass spectrometry. Concentrations vary from 0.02 to 0.8 ppm in oceanic basalts (mid-ocean ridge ...
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Pfänder J.A.; Jochum K.P.; Todt W.; Kröner A.; Kozakov I. (2002)We report major-element, trace-element and isotopic data of volcanic rocks from the late-Neoproterozoic (570 Ma) Agardagh Tes-Chem ophiolite in Central Asia, south-west of Lake Baikal (50.5N, 95E). The majority of samples ...
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Stolz A.J.; Jochum K.P.; Spettel B.; Hofmann A.W. (1996)The single most distinctive feature of volcanic rocks from convergent-margin settings is a marked depletion of the high field strength elements (HFSE) Nb, Ta, and Ti relative to large ion lithophile and light rare earth ...
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Hofmann A.W.; Jochum K.P.; Seufert M.; White W.M. (1986)Nb/U ratios and Ce/Pb ratios are surprisingly uniform at 47 _+ 10 and 25 ___ 5, respectively, in both mid-ocean ridge basalts (MORB) and ocean island basalts (OIB). We show that these ratios also characterize ...
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Puchtel I.S.; Hofmann A.W.; Mezger K.; Jochum K.P.; Shchipansky A.A.; Samsonov A.V. (1998)Field studies combined with chemical and isotope data indicate that the Kostomuksha greenstone belt in the NW Baltic Shield consists of two lithotectonic terranes, one mafic igneous and the other sedimentary, separated by ...
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Jochum K.P. (1996)Five carbonaceous chondrites (including the CI chondrites Orgueil and Ivuna) were analyzed by spark source mass spectrometry (SSMS) for the platinum-group elements Ru, Rh, Os, Ir, Pt, as well as W, Re, Au, Th, and U. ...
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Becker H.; Carlson R.W.; Jochum K.P. (2000)The trace element compositions of eclogites, blueschists and mafic granulites from high-pressure terranes have been analysed to investigate element losses and fractionation that occur during dehydration of oceanic basalt ...
Now showing items 1-7 of 7