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Now showing items 161-180 of 234
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(1997)Owing to the association with diamonds, eclogite xenoliths have received disproportionate attention given their low abundance in kimberlites. Several hypotheses have been advanced for the origin of eclogite xenoliths, from ...
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(1999)Acceptance of the theory of plate tectonics was accompanied by the rise of the mantle plume/hotspot concept which has come to dominate geodynamics from its use both as an explanation for the origin of intraplate volcanism ...
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(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 ...
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(2004)The redox state variation of orogenic granitoids along convergent plate margins is examined in the Phanerozoic Circum-Pacific Belt and in some Cryptozoic terranes. The Phanerozoic granitoids of the NW and NE Pacific Rims ...
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(2004)Geochemical composition of sedimentary assemblages is determined by the interaction of specifics of provenances, weathering conditions, mass transfer, sedimentation, metamorphism, and other factors. The role of geodynamic ...
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(2001)Millipede microstructures are described from Archean metaturbidites surrounding the Back River volcanic complex, eastern Slave Structural Province. They are locally developed within andalusite porphyroblasts that grew in ...
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(1996)In order to evaluate the processes responsible for the enrichments of certain siderophile/ chalcophile trace elements during the production of subduction-related magmas, representative lavas from seven subduction zones ...
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(2001)We model the thermal and mechanical structure of Precambrian foreland lithosphere subject to a range of initial thermal states and evolving thermal perturbations beneath an orogen. Temperatures in the lower crust exert a ...
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(1989)Three long-lasting epochs in the earth's tectonic evolution are identified. First, the Catarchean epoch was characterized by the earth's endogenic passivity. Then, the exceptionally active Archean epoch was dominated by ...
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(2003)The Puutsaari intrusion is a potassium-rich magmatic complex in the eastern part of the Svecofennian domain close to the Archaean border. The intrusion is generally undeformed in contrast to 1880–1875 Ma-old country rock ...
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(1987)Tin-ore deposits are localized in the northeastern USSR within Mesozoic clastic rocks of the Verkhoyansk-Chukotka fold zone and partly within Palezoic carbonate rocks in marginal horst anticlinoria of the Kolyma median ...
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(1994)We report trace element data for rare garnet and clinopyroxene inclusions trapped within diamonds occurring in eclogite xenoliths from the Siberian craton. These inclusions are more depleted in incompatible trace elements ...
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(1997)A combined solution for the two major terrestrial lead paradoxes has been sought. These are the ‘future’ paradox (upper crustal and upper mantle Pb isotope compositions plot in the future field in 207Pb/204Pb vs. 206Pb/204Pb ...
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(2001)The bedrock of the Sodankylä schist area consists mainly of Paleoproterozoic volcanic and sedimentary rocks penetrated by mafic and felsic intrusives. This paper reports c. 200 conventional U-Pb analyses mainly on zircon. ...
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(2001)The bedrock in eastern Lapland is divided into the Naruska, Ahmatunturi and Vintilänkaira-Kemihaara granitoid complexes and the supracrustal Tuntsa metasedimentary and Tulppio metavolcanic belts. Traditionally the bedrock ...
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(1989)The question of the age of oldest rocks on the Aldan shield is keenly debated. We analyze the results of our uranium-lead isotope dating of accessory zircons from mafic rocks of the Kurul'ta complex. This Early Archean ...
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(2003)Banded iron formations are prominent sedimentary deposits of the Precambrian, yet the source of their silica remains unresolved. Here we show that Ge/Si ratios preserved in banded iron formation chert layers are indicative ...
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(2002)New measurements of partition of vanadium (V) between spinel, garnet and a pigeonite-like high pressure (P) pyroxene and magnesian liquids on the mantle solidus as a function of oxygen fugacity (fO2) are presented. The ...
Now showing items 161-180 of 234