Results 81 to 90 of about 135 (116)

Rugosoopsis : a new group of Upper Riphean animals

Geological Society, London, Special Publications, 2007
Abstract The Upper Riphean Lakhanda biota (from the Uchur-Mayai region of SE Siberia) contains abundant, well preserved and highly biodiverse microfossil assemblages including Rugosoopsis microfossils, characterized by a uniform shape, with prominent closely transversely spaced wrinkles on the outer ...
T. N. Hermann, V. N. Podkovyrov
openaire   +1 more source

The Sr isotope chemostratigraphy as a tool for solving stratigraphic problems of the Upper Proterozoic (Riphean and Vendian)

Stratigraphy and Geological Correlation, 2014
Published and original data on the Sr isotopic characterization of carbonates from the Riphean and Vendian key sections of the Southern Urals, Siberia, Asia, Africa, Australia, and North America are considered in compliance with the suggested principles of reconstructing the Sr isotopic composition of the Proterozoic seawater.
M A Semikhatov, Gorokhov I M, Kuznetsov A B   +2 more
exaly   +2 more sources

Reconstruction of Source-Rock Composition of the Middle and Upper Riphean Rocks of the Isherim and Bashkir Anticlinoria, Urals

Geochemistry International, 2018
It is shown that the Riphean sediments of the Bashkir and Isherim anticlinoria of the Ural mobile belt were formed in different settings. Sediments of the Bashkir Anticlinorium are autochthonous and were formed in the eastern (in present-day coordinates) Baltica from proximal siliciclastics, whereas the complexes of the Isherim Anticlinorium did not ...
Yu L Ronkin, Petrov G A, Ronkin Yu L
exaly   +2 more sources

New data on Sr-and C-isotopic chemostratigraphy of the Upper Riphean type section (Southern Urals)

Stratigraphy and Geological Correlation, 2006
New data on Sr-and C-isotopic systematics of carbonate rocks from the Upper Riphean stratotype (Karatau Group of the southern Urals) are obtained for several southwestern sections of the Bashkirian meganticlinorium, which have not been studied before.
M A Semikhatov, M T Krupenin, Krupenin M T   +2 more
exaly   +2 more sources

Geochemistry of Upper Riphean-Vendian basalts associated with the ‘sparagmites’ of southern Norway

Geological Magazine, 1983
Summary. 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, J. P. Nystuen, A. O. Brunfelt, S. Solheim   +3 more
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LITHIUM-FREE LITHIOPHORITE FROM THE UPPER RIPHEAN SEDIMENTS OF SALAIR

International Geology Review, 1990
(1990). LITHIUM-FREE LITHIOPHORITE FROM THE UPPER RIPHEAN SEDIMENTS OF SALAIR. International Geology Review: Vol. 32, No. 3, pp. 302-317.
V. P. Rakhmanov, P. F. Andrushchenko, L. N. Vyal'sov, G. V. Sokolova, A. I. Tsepin   +4 more
exaly   +2 more sources

The Upper Riphean of the Yenisei Range

Russian Geology and Geophysics, 2007
Abstract 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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REGIONAL STRATIGRAPHIC SCHEME OF THE UPPER AND FINAL RIPHEAN AND VENDIAN DEPOSITS OF THE SOUTHERN URALS (PROJECT 2022)

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, Viktor Nikolaevich Puchkov   +1 more
openaire   +1 more source

Carbon and oxygen isotopic composition in carbonate rocks of the Deminskaya and Nizvinskaya Suites (the Upper Riphean of the Northern Ural)

Stratigraphy and Geological Correlation, 2009
N M Chumakov, Pokrovsky B G, Chumakov N M   +2 more
exaly   +2 more sources

Habitats and probable nature of acritarchs from the Upper Riphean Chencha Formation

Paleontological Journal, 2007
Morphology 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, E. N. Chatta, T. A. Kornilova, V. K. Nemerov   +3 more
openaire   +1 more source