Results 21 to 30 of about 242 (131)

Provenance reconstructions. Article 1. Mineralogical and petrographic approaches and methods

Литосфера, 2020
Research subject. This is the first in the series of four articles, which aims to review existing provenance reconstruction tools.Methods and materials.
A. V. Maslov, O. Yu. Melnichuk, G. A. Mizens, Yu. V. Titov   +3 more
doaj   +1 more source

GOLD POTENTIAL OF THE UPPER DEVONIAN BASAL CONGLOMERATES OF THE KANIN PENINSULA (NENETS AUTONOMOUS DISTRICT, RUSSIA) [PDF]

Минералогия, 2022
Native gold and garnets are described for the first time in heavy concentrates from coarse-grained sediments of the Upper Devonian Tayaokuyakha Formation, which occurs on the eroded Upper Riphean schists with angular and azimuthal unconformity (middle ...
M.A. Pavlova, D.A. Varlamov, S.M. Snigirevsky, D.V. Zarkhidze, S.V. Petrov, M.A. Rassomakhin   +5 more
doaj   +1 more source

Features of the structure and composition of Karuyarvinskaya Riphean Suite of Peninsula Srednii (northern coast of the Kola Peninsula)

Литосфера, 2015
We considered the issues of the structure, material composition and secondary changes of Karuyarvinskaya suite rocks of riphean Kildin series at Peninsula Srednii. There is the characteristic of stromatolithic biostromes Stratifera aff.
J. V. Mikhailenko, O. S. Kochetkov, N. F. Ivanov, S. A. Anisimova   +3 more
doaj   +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

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

Sulfide mineralization, native gold and its geochemical connections in the Riphean deposits of the Avzyan ore-bearing region (the Southern Urals)

Литосфера, 2018
In the Avzyan ore-bearing region the sulfides from the low-sulfide gold-quartz deposits (Ulyuk-Bar, Kurgashly) are characterized by higher concentrations of As, Co, Ni, Cu, Pb in comparison with sulfides from sediments outside of ore-bearing zones.
Sergei V. Michurin, Aisylu A. Sharipova, Мikhail Т. Krupenin, Dmitrii A. Zamyatin, Аlsu М. Musina, Vladimir А. Popov   +5 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

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