scholarly journals Layered Gabbroids of the Pekulney Ridge, Chukotka, Northeastern Russia: Geology, Petrography, Age, and Geodynamics

2018 ◽  
Author(s):  
Irina L’vovna Zhulanova
Keyword(s):  
Northeastern Russia

“Invisible” Gold in Pyrite and Arsenopyrite from The Pavlik Deposit (Northeastern Russia)

2020 ◽  
Vol 495 (1) ◽  
pp. 821-826
Author(s):  
N. V. Sidorova ◽  
V. V. Aristov ◽  
A. V. Grigor’eva ◽  
A. A. Sidorov
Keyword(s):  
Northeastern Russia ◽  
Invisible Gold

Summer Temperature Since 1600 for the Upper Kolyma Region, Northeastern Russia, Reconstructed from Tree Rings

1994 ◽  
Vol 26 (1) ◽  
pp. 60 ◽  
Author(s):  
C. J. Earle ◽  
L. B. Brubaker ◽  
A. V. Lozhkin ◽  
P. M. Anderson
Keyword(s):  
Tree Rings ◽  
Summer Temperature ◽  
Northeastern Russia

The Age of Gold Mineralization in the Yana–Kolyma Metallogenic Belt, Northeastern Russia: First Data of Re–Os Isotope Geochronology of Native Gold

2021 ◽  
Vol 15 (4) ◽  
pp. 293-306
Author(s):  
V. Yu. Fridovsky ◽  
N. A. Goryachev ◽  
R. Sh. Krymsky ◽  
M. V. Kudrin ◽  
B. V. Belyatsky ◽  
...  
Keyword(s):  
Native Gold ◽  
Gold Mineralization ◽  
Northeastern Russia ◽  
Isotope Geochronology ◽  
Metallogenic Belt ◽  
Os Isotope

Valanginian Subalkaline Magmatism of the Rassokha and Argatass Terranes (Northeastern Russia)

2021 ◽  
Vol 501 (1) ◽  
pp. 925-932
Author(s):  
S. N. Sychev ◽  
O. Yu. Lebedeva ◽  
A. K. Khudoley ◽  
S. D. Sokolov ◽  
A. V. Rogov ◽  
...  
Keyword(s):  
Northeastern Russia

scholarly journals High-temperature thermomagnetic properties of vivianite nodules, Lake El'gygytgyn, Northeast Russia

2013 ◽  
Vol 9 (1) ◽  
pp. 433-446 ◽  
Author(s):  
P. S. Minyuk ◽  
T. V. Subbotnikova ◽  
L. L. Brown ◽  
K. J. Murdock
Keyword(s):  
Magnetic Susceptibility ◽  
High Temperature ◽  
Magnetic Measurements ◽  
Iron Phosphate ◽  
Northeastern Russia ◽  
Northeast Russia ◽  
Low Field ◽  
Lake El’Gygytgyn ◽  
Monoclinic Pyrrhotite ◽  
Thermomagnetic Properties

Abstract. Vivianite, a hydrated iron phosphate, is abundant in sediments of Lake El'gygytgyn, located in the Anadyr Mountains of central Chukotka, northeastern Russia (67°30′ N, 172°05′ E). Magnetic measurements, including mass-specific low-field AC magnetic susceptibility, field-dependent magnetic susceptibility, hysteresis parameters, temperature dependence of the induced magnetization, as well as susceptibility in different heating media, provide ample information on vivianite nodules. Electron microprobe analyses, electron microscopy and energy dispersive spectroscopy were used to identify diagnostic minerals. Vivianite nodules are abundant in both sediments of cold (anoxic) and warm (oxic) stages. Magnetic susceptibility of the nodules varies from 0.78 × 10−6 m3 kg−1 to 1.72 × 10−6 m3 kg−1 (average = 1.05 × 10−6 m3 kg−1) and is higher than the susceptibility of sediments from the cold intervals. Magnetic properties of vivianite are due to the respective product of oxidation as well as sediment and mineral inclusions. Three types of curves for high-temperature dependent susceptibility of vivianite indicate different degrees of oxidation and inclusions in the nodules. Vivianite acts as a reductant and reduces hematite to magnetite and masks the goethite–hematite transition during heating. Heating vivianite and sulfur mixtures stimulates the formation of monoclinic pyrrhotite. An additive of arsenic inhibits the formation of magnetite prior to its Curie temperature. Heating selective vivianite and pyrite mixtures leads to formation of several different minerals – magnetite, monoclinic pyrrhotite, and hexagonal pyrrhotite, and makes it difficult to interpret the thermomagnetic curves.

Chapter 37: Giant Placers of the Upper Kolyma Gold Fields, Yana-Kolyma Province, Russian Northeast

2020 ◽  
pp. 797-821
Author(s):  
N. A. Goryachev ◽  
A. S. Yakubchuk ◽  
I. S. Litvinenko ◽  
A. V. Lozhkin ◽  
Yu.V. Pruss ◽  
...  
Keyword(s):  
Late Jurassic ◽  
Climatic Factors ◽  
Gold Deposits ◽  
Passive Margin ◽  
Northeastern Russia ◽  
Quartz Veins ◽  
Orogenic Gold Deposits ◽  
The North ◽  
Lithospheric Plates ◽  
Rock Source

Abstract The Upper Kolyma gold placers of northeastern Russia produced 2,700 metric tons (t) Au. Approximately 40% of this gold was extracted from just five placers, Chai-Yuria, Berelekh, Maldyak, Malyi At-Yuryakh, and Omchak, and their immediate tributaries. The placers were derived from Late Jurassic to Early Cretaceous lode deposits, formed during sinistral translation subsequent to the Kolyma-Omolon superterrane accretion to the Verkhoyansk passive margin of the Siberian craton. The metallogenic events produced either abundant and widespread small quartz veins or more localized large to superlarge quartz stockworks and disseminated gold deposits. These orogenic gold deposits acted as a principal hard-rock source during formation of the gold placers, beginning in the Late Cretaceous but most importantly during the Cenozoic. Tectonic, geomorphologic, and climatic factors at a triple junction of the North American, Eurasian, and Okhotsk lithospheric plates provided the ultimate controls on placer formation.

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