Results 41 to 50 of about 2,364 (193)

Carbon and Oxygen Isotopic Stratigraphy of Mesoproterozoic Carbonate Sequences (1.6–1.4 Ga) from Yanshan in North China

International Journal of Oceanography, Volume 2011, Issue 1, 2011., 2011
In Yanshan, located in the northern part of North China, Mesoproterozoic carbonate sequences (1.6–1.4 Ga) form a 10, 000 m thick succession in an aulacogen basin. Carbon and oxygen isotope (δ13O and δ18O, resp.) data were obtained from 110 carbonate samples across three sections of these Mesoproterozoic deposits. From the early to late Mesoproterozoic,
Kuang Hongwei, Liu Yongqing, Li Jiahua, Peng Nan, Luo Shunshe, Cen Chao, Henk Brinkhuis   +6 more
wiley   +1 more source

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 ...
N. Sergeeva, V. Puchkov
semanticscholar   +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

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

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

STRATOTYPE AND REFERENCE SECTIONS OF THE KATAV AND INZER FORMATION THE KARATAU GROUP OF THE UPPER RIPHEAN IN THE INZER SYNCLINORIUM (SOUTHERN URALS)

Geologicheskii vestnik, 2022
The object of the study was the sections of the Katav and Inzer Formations in the Inzer Synclinorium in the Southern Urals. The sediments of the studied formations of Karatau Group in the Inzer synclinorium are most completely represented due to a ...
N. Sergeeva, S. A. Dyakova
semanticscholar   +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

Polychronous (360-2940 Ma) zirconology of the “Riphean” metabasalts of the Bolshoi Miass (Southern Urals)

Lithosphere, 2022
Research subject. Volcanogenic formations of the Navysh complex of the Ai Formation in the Taratash anticlinorium of the Southern Urals, which have been thought to be Lower Riphean. Results.
A. A. Krasnobaev, V. Puchkov, N. Sergeeva, S. V. Busharina, N. N. Farrakhova, S. A. Dyakova   +5 more
semanticscholar   +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