Журнал «Отечественная геология»


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MINERAGENY
Migachev I.F., Minina О.V., Zvezdov V.S. Koryak-Kamchatka region: potential porphyry copper province

I.F.MIGACHEV, O.V.MININA, V.S.ZVEZDOV (Central Research Institute of Geological Prospectingfor Base and Precious Metals) (FSBI TsNIGRI)

Using porphyry copper deposit forecasting method developed in TsNIGRI, Koryak-Kamchatka region prospects for this mineralization style were evaluated for the first time. Andesitic and basaltic volcanoplutonic belts hosting the known porphyry copper occurrences are described. Plutonogenic and volcanogenic units related to porphyry copper and associated gold-polysulfide and copper-arsenic occurrences belonging to various parts of metallogenically complex ore-magmatic systems are defined. Prospects of the identified potential ore districts and clusters for porphyry copper deposit discovery are evaluated. On the whole, Koryak-Kamchatka region can be viewed as a potential porphyry copper province. However, considering a number of factors, primarily, economic and environmental, conclusion is made about the priority of forecasting and mineragenic work in respect to Au-rich copper-arsenic and gold-polysulfide ores.

Key words: volcanoplutonic belts, ore-bearing plutonogenic and volcanogenic units, metallogenically complex ore-magmatic systems, gold-polysulfide and copper-arsenic occurrences, forecasting and prospecting.

Migachev I.F. This email address is being protected from spambots. You need JavaScript enabled to view it.

Minina О.V. This email address is being protected from spambots. You need JavaScript enabled to view it.

Zvezdov V.S. This email address is being protected from spambots. You need JavaScript enabled to view it.

METALLIFEROUS AND NONМETALLIFEROUS МINERAL DEPOSIТS
Yablokova S.V.1, Samosorov G.G.2, Pozdnyakova N.N.1 Typomorphic gold features as criteria of placer association with primary gold-silver-type sources (example from Mnogovershinnoye ore placer cluster)

Yablokova S.V.1, Samosorov G.G.2, Pozdnyakova N.N.1

1 (Central Research Institute of Geological Prospecting for Base and Precious Metals)

2 (Institute of criminalistics of the center for special equipment of the FSB of Russia)

A comprehensive study of native gold from Mnogovershinnoye gold cluster ores and placers (granulometry, crystal morphology, internal structure, nature of exogenetic transformations, fineness and trace element composition) was performed to define placer association with primary sources. Using ICP-MS method and X-ray spectrographic analysis, new data on geochemical gold features was obtained, which expands and clarifies the evidence of gold typomorphism from a gold-silver deposit primary source and its association with placers.

Key words:native gold, orebody, placers, typomorphism.

Yablokova S.V.

Samosorov G.G.

Pozdnyakova N.N. This email address is being protected from spambots. You need JavaScript enabled to view it.

Ostapenko N.S., Neroda O.N. К генезису золото-серебряного месторождения Купол (Северо-Восток России)

N.S.OSTAPENKO, O.N.NERODA (Institute of Geology and Natural Management of the Far Eastern Branch RAS, Blagoveschensk, Russia)

A new version of genesis of the epithermal gold-silver deposit Kupol (Chukotka), its mineral composition of ores and conditions of ore-localization based on the analysis of published geological materials on the geological structure had purposed in this article. The active thermal ore-forming role of completing the volcanic cycle of the multiphase subvolcanic complex’ the proximal bodies of the Upper Cretaceous rhyolites had been proved. The main factors of this deposit’ formation and the conditions that favored the appearance of large ore bodies and rich ores were considered. The magma chamber, unified faulty magmatic and fluid conductor, rock screen, flank clusters of subvolcanic rhyolite bodies and their integral thermal anomalies that initiated and sustained the deep fluid thermal convection under the screen, its mixing with fractured pore and meteoric waters and formation of gradient temperature zones, were considered among the main factors. The conjugation of these factors in space and time, the active tectonic regime and the long-term preservation of the deformation plan were the favorable conditions for ore formation. They maintained the high permeability of the fluid conductor, prevented a wide dispersion of fluids and provided a telescopic deposition of different mineral parageneses.

Key words:Au-Ag deposit Kupol, magma conductor, fluid conductor, rock screen, subvolcanic complex, thermal convection of fluid.

Ostapenko N.S. This email address is being protected from spambots. You need JavaScript enabled to view it.

Neroda O.N. This email address is being protected from spambots. You need JavaScript enabled to view it.

REGIONAL GEOLOGY
Kokovkin А.А. Bureya rockslide phenomenon: field data and rockslide formation model

A.A.KOKOVKIN (Institute of Tectonics and Geophysics FEB RAS)

The results of Bureya rockslide field study are presented. The phenomenon appears to be a dynamically evolving geological system with a complicated structure. The position of a phenomenal rockslide in the regional geological structure is examined, and the internal structure of the rockslide (a source rock substrate, a rockslide cirque, a residual rockslide tail and scarps, and its host geological structure) is investigated. The main energy source of the rockslide formation is determined which is revealed to be the stress-strain state of the rockslide substrate reaching a critical threshold due to impulse strike-slip fault tectonics. Tectonic deformations displayed before and during the event and traces of a «tsunami» and a backward wave are investigated. The evolutionary rockslide model is developed.

Key words: ockslide, tsunami, strike-slip fault deformations, stress-strain state.

Kokovkin А.АThis email address is being protected from spambots. You need JavaScript enabled to view it..

LIТHOLOGY, PETROLOGY, MINERALOGY, GEOCHEMISTRY
Petrochenkov D.A. Jewelry and ornamental ammonites from the deposits of the Hauterivian stage of the Ulyanovsk Region: Mineral composition, gemological characteristics

D.A.PETROCHENKOV (Russian State Geological Prospecting University (MGPI–RSGPU))

Significant volumes of products from ammonites of jewelry and ornamental quality of the Ulyanovsk region are entering the Russian and world markets. Ammonites are associated with the Lower Cretaceous Hauterivian deposits and consist mainly of aragonite, calcite and pyrite. The walls and partitions of the ammonite shells retained the original aragonite composition. Also established inclusions of apatite, algodonite, pyrolusite, hematite, goethite, quartz, ferrihydrite, magnetite, uranium oxide, vernadite, todorokite, monazite, halloysite, plagioclase, kaolinite, glauconite, dolomite, graphite and organic matter. An important role in the formation of new mineral species was played by bacteria. Mineralization of undamaged ammonite chambers was carried out by the sequential formation of calcite and pyrite layers without metasomatic substitutions. The color of calcite layers is determined by the contents of Mn and Fe. Ammonites are characterized by high decorativeness and good technological characteristics; they can be mined in the coastal cliffs and the beach area of the river Volga without mining, without violating the environment.

Key words:: ammonite, Ulyanovsk region, Hauterivian stage, calcite, pyrite, aragonite, jewelry and ornamental stones.

Petrochenkov D.A. This email address is being protected from spambots. You need JavaScript enabled to view it.

GEOLOGY AND GEOPHYSICS OF ТНЕ WORLD OCEAN
Sagalevich А.М.1, Sagalevich V.D.2 The study of hydrothermal fields on ocean bottom with deep submersibles «Mir»

A.M.SAGALEVICH 1,V.D.SAGALEVICH 2

1Shirshov Institute of Oceanology of Russian Academy of Sciences

2Lomonosov Moscow State University

In this article, the methods of geological research of hydrothermal fields on the ocean floor with the use of deep manned submersibles Mir-1 and Mir-2 are considered. A brief description of the Mir submersibles and their advantages over foreign counterparts is given. The results of geological studies of hydrothermal fields of various types in different regions of the World Ocean are presented. Quantitative estimations of ore formation and methane seeps in some areas of Mirs research are given.

Key words: Deep manned submersibles «Mir-1», «Mir-2», hydrothermal fields, methods of geological research, spreading, rift zones, plumes.

Sagalevich А.М. 1 This email address is being protected from spambots. You need JavaScript enabled to view it.

Sagalevich V.D. 2 This email address is being protected from spambots. You need JavaScript enabled to view it.

ТНЕ 75th ANNIVERSARY OF ТНЕ VICTORY IS DEDICATED ТО

TsNIGRI veterans -participants ofthe great Patriotic war: A.Vlzhorsky, S.A.Manilov, V.T.Martynov, L.A.Bolotov, V.V.Lebedev, M.B.Shebeko, L.I.Yakovlev

MEMORAВLE DATES

The 115th anniversary of the birth of Gerasim Vasilyevich Bogomolov

n memory of Alexander Alexandrovich Konstantinovsky

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