Results 31 to 40 of about 23,060 (244)

STABLE ISOTOPES (δ18O, δ13C, δ34S) IN ORES FROM THE KOPYLOVSKOE, KAVKAZ AND KRASNOE GOLD DEPOSITS (BODAIBO REGION) [PDF]

Минералогия
The article presents data on isotopic composition of oxygen of vein quartz and carbonates, carbon of carbonates, and sulfur of sulfides of the Kopylovskoe, Kavkaz and Krasnoe gold deposits located within the Baikal-Patom Highland in the Ediacaran ...
E.E. Palenova, S.A. Sadykov
doaj   +1 more source

Geochemistry of beryl varieties: comparative analysis and visualization of analytical data by principal component analysis (PCA) and t-distributed stochastic neighbor embedding (t-SNE)

Записки Горного института, 2022
A study of the trace element composition of beryl varieties (469 SIMS analyses) was carried out. Red beryls are distinguished by a higher content of Ni, Sc, Mn, Fe, Ti, Cs, Rb, K, and B and lower content of Na and water.
Sergey G. Skublov, Aleksandra K. Gavrilchik, Aleksey V. Berezin   +2 more
doaj   +1 more source

Thermochronologic Constraints on the Extensional History of the Ibex Hills, Southeastern Black Mountains, Death Valley, California

Geological Journal, EarlyView.
A. Modeled T‐t paths for samples in the northern Ibex Hills, showing steady cooling throughout much of the Cenozoic, until rapid Miocene cooling. B. Weighted mean paths for each sample in this study. Note that all show a rapid cooling event at or just after 10 Ma, which is interpreted to represent exhumation as a result of regional extenstion ...
Zachariah D. Fleming
wiley   +1 more source

Notable Impact of Paleotectonic Stress on Gold Mineralisation in the West Qinling Orogen

Geological Journal, EarlyView.
By applying fuzzy clustering and multiple inverse methods, we systematically processed the data of vein and fault slip in this ore deposit to reveal the transition of orogenic geological environment and paleotectonic stress field. Our research results show two different stress states: the northwest–southeast extensional stress field and the northeast ...
Hongyan Wang, Aibing Chen, Jian Yang, Yuan Zhang   +3 more
wiley   +1 more source

A Reassessment of Petrochemistry of ~1.2 Ga Tonalitic Rocks of the Northern Tugela Terrane, Natal Metamorphic Belt, South Africa: Further Constraints on the Evolution of This Belt

Geological Journal, EarlyView.
Our petrochemical studies on ~1.2 Ga granitoids of the Natal Metamorphic Belt, South Africa, do not suggest any property similar to Phanerozoic‐style subduction‐related granitoids. Plot of Kotongweni Tonalite in Y versus Sr diagram (after Moyen 2011), note that most samples have Sr/Y < 50.
Palesa Leuta, Saumitra Misra, Thembiso O. Basupi   +2 more
wiley   +1 more source

Using Petrogeochemical Modeling to Understand the Relationship between Paleozoic Magmatism in the Kola Region and Its Precambrian History

Geosciences, 2019
The Kola region hosts numerous Paleozoic massifs of ultrabasic alkaline rocks and carbonatites with deposits of commercially valuable metals, such as iron, tantalum, niobium, and rare earth elements.
Nikolay E. Kozlov, Nikolay O. Sorokhtin, Eugeny V. Martynov   +2 more
doaj   +1 more source

AGE CONSTRAINTS AND SOURCE AREAS FOR THE PRECAMBRIAN TO CAMBRIAN STRATA OF THE SOUTHERN YENISEI RIDGE (REDKOLESNAYA AND OSTROVNOY FORMATIONS)

Геодинамика и тектонофизика, 2023
The Precambrian to Cambrian strata at the southwestern margin of the Siberian Platform are ubiquitously characterized by a gradual transition from red-colored alluvial and deltaic deposits to shallow-marine carbonates, reflecting a transgressive infill ...
V. V. Marusin, B. B. Kochnev, G. A. Karlova, A. I. Proshenkin   +3 more
doaj   +1 more source

Refinement of the Quaternary seismic stratigraphy and analysis of buried glacial channels on the Labrador Shelf

Journal of Quaternary Science, EarlyView.
ABSTRACT The Laurentide Ice Sheet covered vast areas of North America during the Wisconsinan, including the Labrador Shelf, off the coast of eastern Canada. The shelf is characterized by glacial cross‐shelf troughs, which have been considered as predominantly eroded by the last ice advance.
Kai‐Frederik Lenz, Felix Gross, A. Catalina Gebhardt, Arne Lohrberg, Ralph Schneider, Henriette Kolling, Florian Riefstahl, Orlando Martinez Bautista, Viktoria Thamm, Sebastian Krastel   +9 more
wiley   +1 more source

Structure and Depositional Environments of the Cenomanian–Coniacian Sequence in Crimea

Russian Journal of Earth Sciences
This paper presents the results of a facies analysis of the Upper Cretaceous deposits in Southwestern and Central Crimea and a characterization of the Cenomanian–Coniacian sequence.
Shishlov Sergey Borisovich, Ivanova V. V., Panova E. G., Dubkova K. A., Kuznecov A. B., Chebotareva V. A.   +5 more
doaj   +1 more source

T-t Evolution of the Early Proterozoic Rocks in the Northern Ladoga Region from the Data on U-Pb, Rb-Sr and Sm-Nd Systems in Minerals

Геодинамика и тектонофизика
This paper presents the results of a study of isotopic systems in minerals and rocks in southern margin of the epi-Archean Karelian craton in the zone of its junction with the Svecofennian mobile belt.
Sh. K. Baltybaev, V. M. Savatenkov, M. E. Petrakova   +2 more
doaj   +1 more source