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Now showing items 21-40 of 199
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(2000)The composition of solid precipitated from cooling magma is calculated from chemical differentiation profiles and an incompatible element monitor of fractionation. In a period of cooling, magma evolves to a derivative ...
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(1988)We consider the composition and the genesis of oldest carbonates from recently obtained data on Early Archean greenstone belts and granulite complexes older than 3 b.y. These data cover about 300 chemical analyses, including ...
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(2004)Early Archean (3.46 Ga) hydrothermally altered basaltic rocks exposed near Marble Bar, eastern Pilbara Craton, have been studied in order to reveal geological and geochemical natures of seafloor hydrothermal carbonatization ...
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(2006)New mapping, geochemistry and zircon U-Pb ion microprobe geochronology of pre-3750 Ma rocks from West Greenland was used to identify sedimentary protoliths in a problematic high-grade metamorphic terrane. Samples were ...
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(1989)In the Kostomuksha iron district, located in the Archean granite-greenstone region, komatiites and komatiitic basalts appear among volcanic rocks of the Kontokskaya and the Gimoly groups, as northwest-striking zones. The ...
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(2003)Large subvolcanic intrusions are recognized within most Precambrian VMS camps. Of these, 80% are quartz diorite-tonalite-trondhjemite composite intrusions. The VMS camps spatially associated with composite intrusions account ...
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(2003)A geochemical, geochronological, and isotopic study of rocks from the Panozero pluton in central Karelia was carried out. It was shown that the rocks make up a common subalkaline plutonic series and vary in composition ...
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(1989)Modal and chemical data for variably-depleted peridotites of oceanic origin together with estimates of the composition of fertile parental peridotite are used to define an oceanic trend. This trend is most clearly illustrated ...
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(1988)A rare-earth fluoride of sodium and calcium with the formula NaCaREF6 was discovered in 1958 in an albitized granite (apogranite) pluton and called gagarinite. It is a typomorphic mineral of rare-metal alkalic metasomatites, ...
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CONSOLIDATION OF CONTINENTAL CRUST IN LATE ARCHAEAN-EARLY PROTEROZOIC TIMES: A PALAEOMAGNETIC TEST (2003)The proposition that continental crust consolidated during late Archaean-early Proterozoic times as spatially distinct groups of cratons is tested using palaeomagnetic results assigned to the interval 2900-2200 Ma. Geological ...
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(1992)Current hypotheses for the source rock of low Ca garnets hosted in mantle-derived diamonds and xenoliths range from residues of komatiite generation, to subducted serpentinite, to subducted mid-ocean ridge (MORB) harzburgite. ...
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(2002)The paper reports the results of complex studies of core samples of Archean rocks from the Kola Superdeep Borehole and analogues of these rocks collected at the surface. The analogy of these rocks is justified by the ...
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(2003)The Earth's continents are cored by Archean cratons underlain by seismically fast mantle roots descending to depths of 200 + km that appear to be both more refractory and colder than the surrounding asthenospheric mantle. ...
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(1987)The authors analyzed diamonds from rutile-sphene eclogite bodies whose garnet is not pyrope, but andradite, and which lack omphacite pyroxene. These eclogite bodies occur within local ring structures, revealed by remote ...
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(1986)This paper is a review of well-documented geochronological and related isotopic evidence for the age and total crustal residence time of the oldest known terrestrial rocks, mainly using Rb/1bSr, Sm/1bNd and U/1bPb decay ...
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(1992)Data on the geophysics and geology of the jointing zones separating the areas of Archean and early Proterozoic consolidation of the Ukrainian and Baltic shields were compared. It was discovered that the deep structure and ...
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(1995)We report the results of partial melting experiments between 8 and 32 kbar, on four natural amphibolites representative of metamorphosed Archean tholeiite (greenstone), high-alumina basalt, low-potassium tholeiite and ...
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(2003)The origin and evolution of cratonic roots has been debated for many years. Precambrian cratons are underlain by cold lithospheric roots that are chemically depleted. Thermal and petrologic data indicate that Archean roots ...
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(2001)A compilation of more than 1200 δ13C–N data from well-characterised diamonds show a correlation of the maximum diamond nitrogen content (i.e. a limit sector) with δ13C over the full diamond δ13C range (i.e. more than 30‰). ...
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(1994)We have investigated eight diamond-bearing bimineralic eclogite xenoliths from the Udachnaya Mine, Yakutia, Siberia, in terms of major elements, , and oxygen isotopic ratios. The β18O-values, measured with the new ...
Now showing items 21-40 of 199