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Now showing items 61-80 of 197
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(Общество с ограниченной ответственностью «Георесурсы», 2018)A conodont sequence from the Przhidolian stage of the Upper Silurian and almost the entire Lokhkovian stage of the Lower Devonian has been established in the sections of the Upper Silurian-Lower Devonian on the southwestern ...
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(1998)During Devonian pulse of alkaline magmatism (370 Ma ago) 18 ultrabasic-alkaline-carbonatite comlexes were formed on the Kola Peninsula.
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(1999)Review of sea-level changes during the big five mass extinctions and several lesser extinction events reveals that the majority coincide with large eustatic inflexions. The degree of certainty with which these eustatic ...
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(2003)A newly refined reef database, modified to calculate reef tracts in relation to major tectonic plates, and with new paleogeographic maps, indicates that the largest known, and latitudinally most widespread Phanerozoic reefs ...
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(2002)The article reviews metallogeny of the main development stages of the Devonian volcanoplutonic belt in Central Kazakhstan and relations of the metallogeny to magmatism and geodynamic environment. Gold quartz-vein or ...
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(2015)Garnet amphibolite in the Baoyintu Group, Inner Mongolia, is mainly composed of garnet, hornblende, plagioclase, quartz and minor rutile/ilmenite. Garnet occurs as porphyroblasts surrounded by plagioclase, forming typical ...
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(2001)By the example of the low-grade metamorphic (no higher than the zeolite facies) Early Devonian Saf'yanovskoe deposit in the eastern slope of the Central Urals, the complex and prolonged history of metasomatic halo formation ...
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(2004)This study deals with the reticulate microornamentation of Late Devonian and Early Carboniferous conodont elements. This ornamentation pattern is considered to represent the imprint of secreting epithelial cells. The basic ...
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(1995)The relationship between the microtexture and dissolution behaviour of fresh, HF acid-etched and naturally weathered alkali feldspar phenocrysts from the Lower Devonian Shap granite has been investigated by SEM and TEM. A ...
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(2000)The paleolandscape schemes for the Eifelian, Givetian and Frasnian seas of Siberia are considered for the first time in the present work. On the basis of sediment lithology, composition of benthic communities, their habitat ...
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(1988)The discovery of hot springs in the pelagic and back-of-the-arc zones of spreading, around which there exist ecosystem communities in which bacteria utilize the energy contained in energy-rich mineral compounds, has drawn ...
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(2003)In order to test different hypotheses concerning the Paleozoic evolution of the Ural–Mongol belt (UMB) and the amalgamation of Eurasia, we studied Middle Devonian basalts from two localities (11 sites) and Lower Silurian ...
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(1998)Minor magmatic intrusions of kimberlite, melilitite and cpx-melilitite occur in the southern part of the Kola Peninsula, Russia, on the Terskii Coast and near the town of Kandalaksha. They yield K-Ar ages of 382 ± 14 Ma ...
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(2001)Processes of mineral alteration involving the mobilization and deposition of more than 30 chemical elements during bauxite formation and epigenesis have been studied on specimens from the Devonian Schugorsk bauxite deposit, ...
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(2002)This study investigates the effects of black shale weathering on the Re-Os isotope system, platinum group element concentrations and the degradation of organic matter. Samples from a weathering profile in Late Devonian ...
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MOLECULAR CHARACTERIZATION OF SOME ENIGMATIC LOWER DEVONIAN FOSSILS - SOME ANSWERS, MORE QUESTIONS (1998)The coalified remains of three extinct nonvascular Lower Devonian plants (Prototaxites Dawson, Pachytheca Hooker, and Parka Fleming) have been analysed using flash pyrolysis-gas chromatography-mass spectrometry, FTIR, and ...
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(2004)Morphological and histological aspects of conodont element regeneration are considered on the basis of material from the Late Devonian and Early Carboniferous. It is shown that the regeneration mechanism of conodonts ...
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(2003)Lower Devonian amygdaloidal basalts in the North Minusinsk Depression contain abundant inclusions of natural solid bitumens [1-3]. Liquid hydrocarbon fluids were found in Lower Devonian rocks on the left wall of the Sokhochul ...
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(2001)Two new athyridid genera, Fastigata with the type species F. longa sp. nov. and Mica with the type species M. borea sp. nov., are described from the Lower Devonian deposits of Eastern Yakutia.
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NEW BIOSTRATIGRAPHIC AND PALEOMAGNETIC DATA ON THE DEVONIAN IN THE WESTERN MONGOL-OKHOTSK FOLD BELT (2001)Crinoids of the Lower-Middle Lochkovian were first determined for the Devonian deposits of the Mongol-Okhotsk fold area, and also first preliminary paleomagnetic data were obtained for these deposits. Lithological and ...
Now showing items 61-80 of 197