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Browsing ELibrary by Title
Now showing items 9066-9085 of 21936
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(1997)New isotope and trace element data are presented for komatiitic basalts and a related peridotite Vinela Dike from the large Vetreny Belt in the southeastern Baltic Shield. The MgO contents of the erupted and intruded magmas ...
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(2002)The basement of the Early Proterozoic Pechenga paleorift was penetrated by the Kola Superdeep Borehole over a depth interval of 6842-12,261 m. The principal types of basement rocks are gneisses of trondhjemite-tonalite ...
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(2003)Dredged samples from the Geophysicist seamount volcano in the northeastern part of the Kurile Basin include volcanic and volcanoclastic rocks ranging from basalt to andesite. The rocks have geochemical features typical of ...
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(2004)Amoeboid olivine aggregates (AOAs) are irregularly shaped, fine‐grained aggregates of olivine and Ca, Al‐rich minerals and are important primitive components of CR chondrites. The AOAs in CR chondrites contain FeNi metal, ...
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(2004)The basaltic Martian meteorite Yamato 980459 consists of large olivine phenocrysts and often prismatic pyroxenes set into a fine-grained groundmass of smaller more Fe-rich olivine, chromite, and an interstitial residual ...
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(1996)In the central Vetreny Belt, southeastern Baltic Shield, an areally extensive 110 m deep lava lake is exposed consisting of remarkably fresh differentiated komatiitic basalt. During eruption, the liquid had a temperature ...
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PETROLOGY OF A LOWER CRUSTAL XENOLITH SUITE FROM DIKES AND EXPLOSION PIPES OF THE KANDALAKSHA GRABEN (2001)The lower crustal xenolith suite contained in alkaline-ultramafic dikes and the explosion pipes of the Kandalaksha graben, northwestern Belomorie, consists of Grt granulites (Grt-Cpx-Pl ± Qtz), two-feldspar Grt granulites ...
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(2000)The megacryst assemblage of Pliocene-Quaternary basanites from the Vitim Plateau comprises clinopyroxene, garnet, ilmenite, Ti-magnetite, biotite, and K-Na-feldspar megacrysts. This assemblage also includes large aggregates ...
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(1997)Bulk compositions acquired by neutron activation analysis are reported for eight Allende dark inclusions (DIs) and compared with compositions of five DIs previously reported in the literature. Enrichments of the elements ...
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(1997)Geological and petrological features of Quaternary volcanic rocks from Bogdan Khmelnitskiy Volcano were used, along with the results of a mass balance calculation, detailed mineralogy, and crystal size distribution, to ...
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(1998)The subaqueous explosive eruption on January 2-3, 1996, produced tephra of predominantly aluminous calc-alkaline basalt composition. The rocks have a moderate alkalinity and an essential mineral assemblage of olivine, ...
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(1999)Clinohumite-bearing parageneses Cal + Dol + Chu 4- Fo + Tr + Phi, Cdl + Dol + Chu + Fo + Phi, Cal + Dol + Chu + Sp, and Cal + Chu + PI + Qtz, referred to the progressive stage of regional metamorphism, have been revealed ...
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(2001)Results of the detailed petrological study (including mineralogical, petrological, and geochemical characterization and isotopic dating) of Neoproterozoic dike swarms in the southern flank of the Siberian craton are employed ...
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(1989)In the Kirgiz Tien Shan, hitherto regarded as a classical orthomagmatic granite province, recent work revealed granitoid rocks formed by metamorphic and ultrametamorphic processes. In their geologic position, structure, ...
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(2004)Highly aluminous xenoliths include kyanite-, corundum- and coesite-bearing eclogites, grospydites and alkremites. These xenoliths are present in different kimberlites of Yakutia but have most often been found in Udachnaya ...
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(2003)This paper presents the results of investigations of the geochemical and isotopic compositions of komatiites from various Late Archean greenstone belts and structures of the Baltic shield. The analysis of major, trace, and ...
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(1998)The Onega plateau constitutes part of a vast continental flood basalt province in the SE Baltic Shield. It consists of Jatulian-Ludikovian submarine volcanic, volcaniclastic and sedimentary sequences attaining in places ...
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(2003)Phase layering in mafic and ultramafic intrusions cannot be explained in terms of convection and crystal accumulation in magma chamber, as vigorous convection of melts enriched in suspended crystals is impossible. Emplacement ...
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(2004)The blueschist/greenshist Terekta Complex is the only blueschist locality known in the Russian Altai. The Terekta metabasites contain Na and Na–Ca amphibole, actinolite, phengite, epidote, albite, quartz, calcite, magnetite ...
Now showing items 9066-9085 of 21936