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Now showing items 61-80 of 185
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(1993)A suite of large and fresh peridotite xenoliths from a picrite tuff deposit in the Cenozoic Vitim volcanic field, {small tilde}200 km east of Lake Baikal, shows a continuous gradation from protogranular spinel through ...
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(1988)Outcrops on the left bank of the Yenisey River expose banded gabbro, gabbro-norite and norite in the western part of this pluton near its floor. In isolated places these rocks were converted by high-pressure metamorphism ...
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(1995)Experimental melting studies indicate that secular variations in the geochemistry of many komatiites were determined by secular variations in the depth of melt segregation in plumes. Higher pressures stabilize garnet ...
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(2003)Discussed are two probable models for lateral growth of continental crust in the Early Precambrian: accretion of island arcs and accretion of oceanic plateaus. Important constraints on geodynamic settings in which Archean ...
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(2003)Our study of magmatic rocks provides grounds for discussing the successive phases and geodynamic conditions of continental crust generation between 3.2-2.83 Ga within the Fennoscandian shield. Three tectono-magmatic phases, ...
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GEOCHEMISTRY AND GENESIS OF DEEP-SEATED ARCHEAN ENDERBITES IN THE SUTAM BLOCK, SOUTHERN ALDAN SHIELD (2001)The stratigraphic bottom of the deep-seated Sutam granulite complex is demonstrated to consist of a stratified metabasite-enderbite formation. Regularities in the distribution of major and trace elements indicate that the ...
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(2001)High-Mg volcanics of the komatiite and tholeiite types are widespread in the greenstone belts of Karelia. Their geochemistry and isotopic features were examined using representative successions of the Late Archean ...
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(2001)Petrogeochemical data are presented on the rock associations of the Onot greenstone belt (GB) located in the southeastern Sayan Region. The infracrustal plagiogneisses and plagiogranitoids of the Onot GB are analogous to ...
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(1997)Lead isotope data from geologically mixed suites of Archaean gneisses often yield secondary isochrons that have statistically better fits than might be expected from the geological constraints on the range of samples used. ...
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(1998)Monazite grains are generally concordant and, with an electron microprobe, give Th-U-total Pb isochron ages in agreement with conventional U-Pb data. Monazites from four samples of post-Archean migmatite from the Ivory ...
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(1998)Deep geodynamic (tectonic and magmatic) activity disturbs matter and temperature balance established previously in the Earth's crust; this results in metamorphism of the rocks. Five types of metamorphism can be recognized: ...
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(1993)Part 1 Foundations of a Contary View: Paradox and puzzles. Radioactivity of continental crust. Radioactivity of upper mantle. The heat flow paradox. Sub-continent upwelling and heat transfer. Seismic and petrographic ...
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(2001)U-Pb age values were obtained on an intrusion of alkaline quartz diorite in the northwestern closing of the Paleoproterozoic Imandra-Varzuga sedimentary-volcanic structure in the Kola Peninsula. The diorite is hosted by ...
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GEOLOGICAL AND GEOCHEMICAL CONTROLS ON THE SILVER CONTENT (FINENESS) OF GOLD IN GOLD-SILVER DEPOSITS (1991)A compilation of microprobe fineness data and a re-evaluation of bullion production fineness data suggest that the gold fineness model of Fisher (1945) can be updated and applied to a wide range of gold-mineralised ...
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(2002)Located at western portion of northern margin of North China craton, the Baotou-Bayan Obo district is one of the most important Fe-REE-Nb and Au metallogenic provinces in China. Presently, about 52 gold deposits and prospects ...
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(1997)Radiometric dating, including numerous high-precision U-Pb baddeleyite and zircon ages, of Paleoproterozoic flood basalts, dike swarms, and layered mafic intrusions worldwide, indicates that a substantial volume of mafic ...
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(2002)Granitization of rocks in the Archean complex penetrated by the Kola Superdeep Borehole is manifested in the development of nebular, patchy, and unclearly banded migmatites with an age of 2.2 Ga. The amounts of migmatitic ...
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(2003)High-pressure granulites are characterised by the key associations garnet-clinopyroxene-plagioclase-quartz (in basic rocks) and kyanite-K-feldspar (metapelites and felsic rocks) and are typically orthopyroxene-free in both ...
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(1998)Compelling evidence now exists for the formation of Archean lode-gold deposits over a substantial range in metamorphic conditions and crustal depth. The commonality of ore-fluid isotopic and geochemical characteristics, ...
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(1990)We discuss the geological, geophysical, and petrological observations that constrain the nature of mantle convection in plumes, and show how theoretical models of mantle plumes have developed over the past three decades. ...
Now showing items 61-80 of 185