Results 31 to 40 of about 666 (163)

The Precambrian in the Sub-Polar Urals : the chronostratigraphic aspect.

Transactions of the Karelian Research Centre of the Russian Academy of Sciences, 2019
New geochronological data on the Lower and Upper Proterozoic complexes of the Sub-Polar Urals are presented, where the outcropping Precambrian section in the Lyapin anticlinoriumis the stratotype for the entire Timan-Northern Urals region.
Александр Михайлович Пыстин, Юлия Ивановна Пыстина, Alexander Pystin, Yulia Pystina   +3 more
doaj   +1 more source

Unusual metasomatites (phyolithites) in the Kolvitskiy gabbro-anorthosite rock mass: composition and structural position

Записки Горного института, 2021
Complex mineralogical, geochemical, and geological-structural characteristics of a rare collection stone of violet color, phyolithite, in the southwestern part of the Kola Peninsula.
Evgenii N. Terekhov, Aleksandr B. Makeev, Aleksandr S. Baluev, Aleksandr N. Konilov, Konstantin V. Van   +4 more
doaj   +1 more source

A fishtail well design for cyclic steam injection—A case study from Yarega heavy oil field in Russia

Energy Science &Engineering, Volume 7, Issue 6, Page 2437-2455, December 2019., 2019
The joint application of cyclic steam injection technology with fishtail wells assists in reducing the travel time the mobilized oil takes to arrive at a well perforation. Our results demonstrate that the synergy between these two strategies can further improve recoveries in heavy oil reservoirs. In addition to the technical advantage of this strategy,
German A. Abzaletdinov, Temitope Ajayi, Youssuf A. Elnoamany, Sergey Durkin, Ipsita Gupta   +4 more
wiley   +1 more source

Rare Earths in Geological Formations of Central Region of the Dniester River Basin, Republic of Moldova

Advances in Geology, Volume 2015, Issue 1, 2015., 2015
In the different varieties of crystalline basement of Archean and Proterozoic age and in Vendian (Ediacaran) basal layers of platform coverture in the Central Basin of the Dniester River were found relatively high concentrations of Lanthanum, Cerium, Yttrium, Ytterbium, and Scandium.
Aurelia Popuiac, Giovanni Martinelli
wiley   +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

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

Isotopic and sedimentological clues to productivity change in Late Riphean Sea: a case study from two intracratonic basins of India [PDF]

, 2002
Enriched13C/12C ratios with δ13C ~3‰ (w.r.t PDB) of two Late Riphean (~700-610 Ma) intracratonic carbonate successions viz., Bhander Limestone of Vindhyan Basin and Raipur Limestone of Chattisgarh Basin suggest higher organic productivity during this ...
Sarkar, A., Sanyal, P., Chakraborty, P. P., Bhattacharya, S. K.   +3 more
core   +1 more source

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

Comparison of Lower and Middle Riphean sparry magnesite deposits of the Southern Urals province

, 2002
Sparry magnesite deposits (SMD) of the Lower Riphean (LR) and Middle Riphean (MR) sequences in the western slope of the South Urals have some distinguished peculiarities, which allows to compare them and speculate about the mechanism of ore formation and
KRUPENIN, MIKHAIL T.
core   +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