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Now showing items 81-100 of 161
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(1992)The two oxygen isotope ratios18O/16O and17O/16O were analyzed in Precambrian (3.5 Gy) and modern cherts and in mantle-derived lavas. All samples exhibit oxygen isotopic compositions consistent with mass-dependent isotopic ...
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(1994)Petroleums and bitumens from Early Proterozoic (≈ 1800 Ma) to Miocene (≈ 15 Ma) age marine strata contain 24-isopropylcholestanes, a novel group of C30 steroids. The abundance of these compounds, relative to 24-n-propylc ...
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(1985)Abstract Paleomagnetic research in the Siberian area provides new data to derive models of relative horizontal movements and the process of amalgamation or consolidation of the Siberian plate. Comparison of the Apparent ...
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(1990)Data obtained in regional geophysical studies by the Yeniseygeofizika Corporation on the southeastern margin of the West Siberian Block have led to a new interpretation of the geological structure and developmental history ...
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(2001)The history of investigation into the petroleum potential of deep-seated horizons of the Uralian region is reviewed. Two major objects for oil and gas prospecting are considered: 1) Late Precambrian (Riphean and Vendian) ...
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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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(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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(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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(1998)Deep seismic reflection data from the 1995 Urals Seismic Experiment and Integrated Studies (URSEIS) transect of the Southern Urals document a distinct ˜5 km vertical offset of the Moho beneath the Uralian foreland, here ...
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(1983)The current situation in 1982 regarding the status and validity of the Ulakhan-Sulugur section on the Aldan River as a candidate for the global stratotype section and point for the Precambrian-Cambrian (PC-C) Boundary is ...
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(2004)It is shown that peat bogs, which accumulate coal- and siderite-bearing sediments, serve as a generator of ferruginous solutions with the significant part of Fe migrating from them in the form of metalloorganic compounds. ...
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(1992)The Vendian period, which preceded the Phanerozoic, was characterised not only by prominent evolutionary events, but also by an unusual composition of the sulphur, carbon and strontium in the sediments. From the point of ...
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(1989)Apatite in apatite-bearing conglomerates previously described from Precambrian metamorphic complexes of the Aldan shield occurs as an accessory mineral in the cement and pebbles. In this article, we have estimated the role ...
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(1990)On the basis of new data we have confirmed our previous conclusion as to the extremely high level of biological activity in the Precambrian. On the other hand, linking this new fact with our previously established fact of ...
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(2001)Orogenic gold vein deposits require a particular conjunction of processes to form and be preserved, and their global distribution can be related to broad-scale, evolving tectonic processes throughout Earth history. A ...
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(1994)Sapphirine occurs with humite-group minerals and forsterite in Precambrian amphibole-facies rocks at Kuhi-lal, SW Pamir Mountains, Tajikistan, a locality also for talc+kyanite ± magnesiohornblende whiteschist. Most of these ...
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(1998)An updated analysis of the global paleomagnetic database shows that the frequency distributions of paleomagnetic inclinations for the Cenozoic and Mesozoic eras (younger than 250 Ma) are compatible with a random geographical ...
Now showing items 81-100 of 161