Results 91 to 100 of about 139 (121)
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Geologicheskii vestnik, 2022
The need to correct individual stratigraphic levels of the Regional Stratigraphic Scheme of the Upper Precambrian deposits of the Urals, existing since 1993, is due to the receipt of new data from lithological-stratigraphic, geotectonic and isotope-geochronological studies of the Upper Precambrian of the Southern Urals.
Nina Dmitrievna Sergeeva +1 more
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The need to correct individual stratigraphic levels of the Regional Stratigraphic Scheme of the Upper Precambrian deposits of the Urals, existing since 1993, is due to the receipt of new data from lithological-stratigraphic, geotectonic and isotope-geochronological studies of the Upper Precambrian of the Southern Urals.
Nina Dmitrievna Sergeeva +1 more
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The Upper Riphean of the Yenisei Range
Russian Geology and Geophysics, 2007Abstract The Yenisei Range and the adjacent territories in the east are subdivided into (1) the Mid-Angara intracratonic depression; (2) the Yenisei pericratonic trough; and 3) a marginal oceanic block, the Isakovka-Predivinsk area.
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Habitats and probable nature of acritarchs from the Upper Riphean Chencha Formation
Paleontological Journal, 2007Morphology and taphonomy of acritarchs from the Upper Riphean deposits of the Baikal Folded Region (eastern Siberia) are analyzed. The morphotypes of acritarchs are compared to various stages in the life cycle of modern green algae of the order Chlorococcales. The acritarchs Dictyotidium minor Stan.
A. M. Stanevich +3 more
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Geochemistry of Upper Riphean-Vendian basalts associated with the ‘sparagmites’ of southern Norway
Geological Magazine, 1983Summary. Upper Riphean/Vendian basalt lavas within the Hedmark Group of the Osen-Røa Nappe Complex, the lowest tectonostratigraphic unit within the Scandinavian Caledonides, are typical continental tholeiites. Differences in their REE patterns may reflect source heterogeneities, while the general lack of correlation between incompatible trace element ...
H. Furnes +3 more
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Russian Geology and Geophysics, 1993
Under consideration are the composition, structure and depositional environments of the Upper-Riphean Dzhura Reef Formation in the southeastern Yenisei Ridge. It was shown that a carbonate platform with reef-like stromatolithic rim structures has been formed in the Dzhurian time. It turned into a deep basin northward. It was shown that the evolution of
E. M. Khabarov, G. I. Tanygin
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Under consideration are the composition, structure and depositional environments of the Upper-Riphean Dzhura Reef Formation in the southeastern Yenisei Ridge. It was shown that a carbonate platform with reef-like stromatolithic rim structures has been formed in the Dzhurian time. It turned into a deep basin northward. It was shown that the evolution of
E. M. Khabarov, G. I. Tanygin
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Precambrian Research, 1991
The Draken Formation (120-250 m) of northeast Spitsbergen (Svalbard) forms part of a thick Upper Proterozoic carbonate platform succession. It consists predominantly of intraformational dolomitic conglomerates, with excellent textural preservation.
I J, Fairchild, A H, Knoll, K, Swett
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The Draken Formation (120-250 m) of northeast Spitsbergen (Svalbard) forms part of a thick Upper Proterozoic carbonate platform succession. It consists predominantly of intraformational dolomitic conglomerates, with excellent textural preservation.
I J, Fairchild, A H, Knoll, K, Swett
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Lithology and Mineral Resources
The lithogeochemical characteristics of the Uk Formation limestones (Uppermost Unit of the Riphean stratotype section in the Southern Urals) are considered. Data points of limestones (40 samples) accumulated in the middle and inner ramp environments have a quite contrasting distribution on diagrams with parameters (La/Sm)sh, (La/Yb)sh and (Sm/Yb)sh ...
A. V. Maslov, S. A. Dub
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The lithogeochemical characteristics of the Uk Formation limestones (Uppermost Unit of the Riphean stratotype section in the Southern Urals) are considered. Data points of limestones (40 samples) accumulated in the middle and inner ramp environments have a quite contrasting distribution on diagrams with parameters (La/Sm)sh, (La/Yb)sh and (Sm/Yb)sh ...
A. V. Maslov, S. A. Dub
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Stratigraphy and Geological Correlation, 2019
Clay subfractions (SFs) with particles size of 2–5, 0.6–2.0, 0.3–0.6, 0.2–0.3, and 0.1–0.2 μm of two shale samples (Upper Riphean Inzer Formation, South Urals) are studied using transmission electron microscopy, X-ray diffractometry (XRD), and U–Pb, Sm–Nd, Rb–Sr, and K–Ar methods.
I. M. Gorokhov +8 more
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Clay subfractions (SFs) with particles size of 2–5, 0.6–2.0, 0.3–0.6, 0.2–0.3, and 0.1–0.2 μm of two shale samples (Upper Riphean Inzer Formation, South Urals) are studied using transmission electron microscopy, X-ray diffractometry (XRD), and U–Pb, Sm–Nd, Rb–Sr, and K–Ar methods.
I. M. Gorokhov +8 more
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Journal of Paleontology, 2001
Abstract Diverse assemblages of silicified microfossils have been detected in lenses of black chert within peritidal carbonates of the Neoproterozoic (Upper Riphean) Shorikha and Burovaya formations, Turukhansk Uplift, northeastern Siberia. These microbiotas are represented by 19 species of simple filamentous and coccoidal microfossils, multicellular ...
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Abstract Diverse assemblages of silicified microfossils have been detected in lenses of black chert within peritidal carbonates of the Neoproterozoic (Upper Riphean) Shorikha and Burovaya formations, Turukhansk Uplift, northeastern Siberia. These microbiotas are represented by 19 species of simple filamentous and coccoidal microfossils, multicellular ...
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Lithology and Mineral Resources, 2003
The paper presents mineralogical, crystallochemical, and Rb–Sr age data on globular layer silicates of the glauconitic series from lower horizons of the Upper Riphean Kil'din Group, Srednii Peninsula. Chloritization significantly changed the globular Al-glauconite in sandstones of the Parajarvinskaya Formation.
T. A. Ivanovskaya +3 more
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The paper presents mineralogical, crystallochemical, and Rb–Sr age data on globular layer silicates of the glauconitic series from lower horizons of the Upper Riphean Kil'din Group, Srednii Peninsula. Chloritization significantly changed the globular Al-glauconite in sandstones of the Parajarvinskaya Formation.
T. A. Ivanovskaya +3 more
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