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Now showing items 81-100 of 160
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(2001)Orogenic gold deposits have formed over more than 3 billion years of Earth's history, episodically during the Middle Archean to younger Precambrian, and continuously throughout the Phanerozoic. This class of gold deposit ...
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(1995)High-Mg volcanic rocks from the ca. 250 Ma old Siberian Flood Basalt Province (SFBP) were analyzed for their osmium and neodymium isotopic compositions in order to help to constrain source characteristics as the system ...
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(1999)Oxygen isotope fractionations have been measured experimentally between dissolved orthophosphate ions H2PO4- and water from 50°C to 135°C. The derived equilibrium fractionation equation reveals that biogenic apatites are ...
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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 ...
Now showing items 81-100 of 160