Results 31 to 40 of about 1,847 (178)

THE RIPHEAN METESHIKHA ISLAND-ARC PERIDOTITE-GABBRO MASSIF (western Transbaikalia) [PDF]

Геология и геофизика, 2015
Abstract New data are presented on the geologic structure, age, petrogeochemical composition, and conditions of formation of the Late Proterozoic Meteshikha ultramafic–mafic pluton of the Ikat complex. Mafic rocks are the main rocks of the massif, whereas ultramafic rocks are secondary; both of them correspond to two intrusive phases ...
D.A. Orsoev, A.S. Mekhonoshin, I.V. Gordienko, R.A. Badmatsyrenova, S.V. Kanakin, A.V. Travin, M.G. Volkova   +6 more
openaire   +2 more sources

U-Pb AGE OF ZIRCONS FROM PALEOPROTEROZOIC SECONDARY QUARTZITES OF THE BOLSHOI TYUTERS ISLAND AND FROM SANDY MATRIX OF EARLY RIPHEAN CONGLOMERATES OF THE GOGLAND ISLAND (GULF OF FINLAND): FEATURES OF THE PRE-RIPHEAN HIATUS IN SEDIMENTATION IN THE NORTHEAST OF THE EAST EUROPEAN PLATFORM

Геодинамика и тектонофизика
The paper presents the results of U-Pb isotope dating of zircons extracted from rocks of the southern part of the Baltic Shield (Early Riphean conglomerates and Paleoproterozoic secondary quartzites) and makes a comparison of these results with the ages ...
E. N. Terekhov, N. B. Kuznetsov, T. V. Romanyuk, M. A. Matveev, A. B. Makeev, A. S. Novikova, M. Yu. Gushchina, A. S. Dubenskiy, V. S. Sheshukov, A. A. Iurmanov   +9 more
doaj   +1 more source

Hydrothermal pyrolysis of organic matter in Riphean mudstone

Geochemistry International, 2009
The catagenesis of organic matter (OM) was modeled by the hydrothermal pyrolysis of a source rock (Riphean mudstone from eastern Siberia). Isothermal experiments 72-h long were carried out in an aqueous environment in autoclaves at temperatures of 300, 310, 320,..., 370°.
Melenevsky, V.N., Kontorovich, A.E., Huang, W.L., Larichev, A. I., Bul’bak, T. A.   +4 more
openaire   +2 more sources

MICROPALEONTOLOGY OF THE LOWER MESOPROTEROZOIC ROPER GROUP, AUSTRALIA, AND IMPLICATIONS FOR EARLY EUKARYOTIC EVOLUTION [PDF]

, 2016
ELiTE: Early Life Traces, Evolution, and Implications for ...
Javaux, Emmanuelle, Knoll, Andrew H.
core   +1 more source

Unique titanium Deposits of Timan: genesis and age issues

Записки Горного института, 2022
The article critically analysesthe hypotheses about the formation, age, and sources of material of large Timan titanium deposits, which were previously considered ancient buried placers formed along the weathering crusts of the Riphean shales. We discuss
Aleksandr B. Makeyev, Nataliya I. Bryanchaninova, Anna O. Krasotkina   +2 more
doaj   +1 more source

The role of proterozoic sediments in the formation of oil and gas content in the northern part of the Volga-Ural oil and gas basin (based on the results of basin modeling)

Georesursy
Two-dimensional basin modeling was carried out along regional profiles (sublatitudinal and submeridional). When modeling, the software package of Lomonosov Moscow State University was used.
D. D. Kozhanov, M. A. Bolshakova, I. S. Khopta   +2 more
doaj   +1 more source

Nature of zircon clastics in the Riphean and Vendian sandstones of the Southern Urals

Georesursy, 2019
New age dates of detrital zircons of terrigenous rocks augmented the possibilities of interpretation of their provenance. Unfortunately this interpretation is restricted by a formal comparison of age-and-composition characteristics of detrital crystals ...
A.A. Krasnobaev, V.N. Puchkov, N.D. Sergeeva, S.V. Busharina   +3 more
doaj   +1 more source

First High‐Precision U–Pb CA–ID–TIMS Age of the Chuanlinggou Formation, North China Craton: Implications for Global Correlations of Black Shales and the Statherian/Calymmian Boundary

Geophysical Research Letters, Volume 51, Issue 18, 28 September 2024.
Abstract The Chuanlinggou Formation in the northern North China preserves the world's earliest multicellular eukaryote microfossils. Here we present a high‐precision zircon U–Pb CA–ID–TIMS age of 1,641.7 ± 1.2 Ma for a tuff layer within the black shales of the Chuanlinggou Formation.
Shuan‐Hong Zhang, Sandra L. Kamo, Richard E. Ernst, Guo‐Hui Hu, Qi‐Qi Zhang, Hafida El Bilali, Yue Zhao   +6 more
wiley   +1 more source

Covariance of Microfossil Assemblages and Microbialite Textures Across an Upper Mesoproterozoic Carbonate Platform [PDF]

, 2013
Early diagenetic chert nodules and beds in the upper Mesoproterozoic Angmaat (formerly Society Cliffs) Formation, Baffin and Bylot islands, preserve microfossils and primary petrofabrics that record microbial mat deposition and lithification across a ...
Kah, Linda C., Knoll, Andrew Herbert, Wörndle, Sarah   +2 more
core   +1 more source

Redox bottom-water conditions in Neoproterozoic basins on eastern and north-eastern periphery of East-European Platform

Литосфера, 2015
The redox bottom-water conditions in the sedimentary basins, which existed during the Late Riphean-Vendian on the east and north-east (in modern coordinates) margins of the Baltic, are investigated.
A. V. Maslov, V. N. Podkovyrov
doaj   +2 more sources