Gold metallogeny of the East Tannu-Ola ore region, Tyva Republic

2021 ◽  
pp. 40-67
Author(s):  
Aleksander Chernykh ◽  
Alexey Shirobokov ◽  
Irina Arsentieva

The Elegest-Mezhegei, Aptara, and Shivilig forecasted gold ore clusters and the Kharalyg and Irbitei forecasted gold-silver-polymetallic ore clusters were distinguished within the East Tannu-Ola iron-copper-polymetallic-gold ore region, based on examination of historical and new geological, geochemical, and metallogenical data. Subsequently, the Urgailyg, Proezdnoe, and Chumurtuk forecasted gold ore fields were delineated within the Elegest-Mezhegei cluster; the Despen ore field was delineated within the Aptara ore cluster; and the Ovur-Ongesh ore field was outlined within the Shivilig cluster. In addition, the Ulug-Sailyg and Ak-Charinsk gold-molybdenum-copper ore fields were distinguished outside the ore clusters. The article summarizes the investigation history, geological-structural position, geological features, and geochemical specialization of the rocks of the East Tannu-Ola region. Descriptions of the ore clusters embrace peculiarities of their geological structure, ore mineralogy, and native gold, as well as parameters of the gold-sulfide-quartz, goldskarn, gold-containing polymetallic VMS, and porphyry molybdenum-copper mineralized zones. The conclusions highlight the metallogenic epochs and distribution regularities of the gold and gold-containing mineralization within the region studied.

Author(s):  
Д.Б. Давыденко ◽  
С.Г. Парада

Приведены результаты металлогенического анализа новых данных, полученных в ходе проведения геолого-поисковых и региональных геофизических работ на территории Донецкого бассейна, представляющего центральный фрагмент Днепрово-Донецкой рифтогенной системы. По результатам металлогенического анализа и математической обработки геофизических данных, включающих оригинальную технологию объектно-ориентированной фильтрации, установлены полихронность и полигенность золотого оруденения, соответствующие полиэтапному развитию Донецкого авлакогена. В составе золотоносных руд вычленяются два основных типа: 1) крупнообъемные зоны и залежи золото-сульфидно-прожилково-вкрапленной минерализации в песчанико-сланцевых углеродистых толщах, относящихся к осадочно-(метаморфогенно)-гидротермальному генетическому классу, связанные с литогенезом и метаморфизмом каменноугольных углеродистых отложений на доорогенном этапе развития авлакогена (Бобриковское и др. месторождения) 2) эпитермальные кварцевые жилы и локальные жильно-прожилковые зоны золото-серебряно-полиметаллической минерализации, связанные с развитием вулкано-плутонических аппаратов центрального типа на этапе мезозойской тектоно-магматической активизации авлакогена, выделяемые по геофизическим данным (Керчикское и др. рудопроявления). Отнесение к осадочно-(метаморфогенно)-гидротермальному генетическому классу золотоносных минерализаций бобриковского типа обосновано особенностями локализации, размещения и вещественного состава руд, а также особенностями геологического строения Донбасса, свойственными классическим рудным районам с подобным типом оруденения в углеродисто-терригенных (черносланцевых) формациях: внутриконтинентальная позиция складчатых структур и отсутствие гранитоидного магматизма, отчетливо выраженная асимметрия складчато-разрывных структур, сочетание углеродисто-терригенных и карбонатных формаций различной степени их постседиментационного преобразования, наличие стратифицированной сульфидной минерализации. Выделение мезозойских вулкано-плутонических структур центрального типа, с которыми связана эпитермальная золотоносная минерализация керчикского типа, основано на выявлении изометричных положительных аномалий магнитного поля, сопряженных с изометричными отрицательными аномалиями гравитационного поля, а также выходами магматических пород. Выявленные в Западном Донбассе к настоящему времени золотоносные руды бобриковского типа представляют собой объекты ранней доорогенной минерализации золото-сульфидно-прожилково-вкрапленного типа в углеродисто-терригенных комплексах. Выявленные в Восточном Донбассе к настоящему времени золото-серебряно-полиметаллические руды керчикского типа представляют собой позднепродуктивную стадию, связанную с регенерацией и перераспределением доорогенных золотоносных минерализаций на этапе мезозойской тектоно-магматической активизации The results of a metallogenic analysis of new data obtained during geological exploration and regional geophysical work in the Donets basin, which is the central fragment of the Dnieper-Donetsk riftogenic system, are presented. According to the results of metallogenic analysis and mathematical processing of geophysical data, including the original technology of object-oriented filtering, the polychronism and polygenicity of gold mineralization is established, corresponding to the poly-phased development of Donetsk aulacogen. In the composition of gold ores, two main types are distinguished: 1) large-volume zones and stratiform deposits of gold-sulfide-vein-disseminated mineralization in sandy-shale carbon strata, belonging to sedimentary (metamorphic) -hydrothermal genetic class, associated with lithogenesis and metamorphism of stony-carbon metamorphism at the preorogenic stage of development of aulacogen (Bobrikovskoye and other deposits) 2) epithermal quartz veins and local vein-vein zones of gold-silver-polymetallic mineralization associated with the development of central-type volcanic-plutonic apparatuses at the stage of Mesozoic tectonic-magmatic activation of aulacogen, identified according to geophysical data (Kerchik and other ore occurrences). The assignment to the sedimentary (metamorphogenic) -hydrothermal genetic class of Bobrikovsky type gold-bearing mineralizations is justified by the features of localization, distribution and material composition of the ores, as well as the peculiarities of the geological structure of the Donbass, characteristic of classical ore regions with a similar type of mineralization in carbon-terrigenous (black shale) formations the position of folded structures and the absence of granitoid magmatism, a pronounced asymmetry of folded-discontinuous structures, with the carbon-terrigenous and carbonate formations of varying degrees of their post-sedimentation transformation, the presence of stratified sulfide mineralization. The isolation of the Mesozoic volcanic-plutonic structures of the central type, which are associated with the zythermal gold-bearing mineralization of the Kerchik type, is based on the detection of isometric positive anomalies of the magnetic field, coupled with isometric negative anomalies of the gravitational field, as well as the outputs of igneous rocks. Gold-bearing ores of the Bobrikov type identified in the Western Donbass to date are objects of early pre -ogenic mineralization of a gold-sulfide-vein-disseminated type in carbon-terrigenous complexes. The gold-silver-polymetallic ores of the Kerchik type discovered in the East Donbass to date represent a late-productive stage associated with the regeneration and redistribution of pre -ogenic gold-bearing mineralizations at the stage of Mesozoic tectonic-magmatic activation


1996 ◽  
Vol 38 (7) ◽  
pp. 625-648 ◽  
Author(s):  
S. F. Strujkov ◽  
O. B. Ryjov ◽  
V. V. Aristov ◽  
N. V. Grygoriev ◽  
Yu. I. Radchenko ◽  
...  

2021 ◽  
Vol 937 (4) ◽  
pp. 042084
Author(s):  
A Tangirov ◽  
T Ishboboev ◽  
B Urunov

Abstract The leading role in the placement of gold mineralization in the Bukantau mountains belongs to structural and lithological factors. For gold-ore and gold-silver occurrences, sandy-shale strata of the flyschoid and olistostrome formations are favorable, then, rocks of the volcanogenic-dolomite-siliceous formation and then the carbonate formation (Okzhetpes type). The leading types of near-ore hydrothermal alteration of the host rocks in the studied deposits are silicification and, to a lesser extent, carbonatization and sericitization. They are accompanied by chloritization, biotitization, argillization, etc. Gold ore deposits and ore occurrences of sulfide-disseminated ores are confined mainly to the deposits of the Karashakh suite of the Middle Carboniferous (C2b + m1 kr). Moreover, gold-sulfide mineralization in the rocks of the Karashakh Formation is unevenly distributed.


Author(s):  
M. S. Topchii ◽  
N. V. Pronina ◽  
A. G. Kalmykov ◽  
G. A. Kalmykov ◽  
M. M. Fomina ◽  
...  

One of the most famous and promising shale formations in Russia is the Bazhenov formation. The ambiguity of ideas about its geological features, caused by the complex, heterogeneous structure of the strata, attracts the attention of many researchers. In this work, the Bazhenov formation is singled out in conjunction with its stratigraphic counterparts in the Bazhenov high-carbon formation (BVCHF). In this were considered the main characteristics of its allotment and distribution over the area, as well as the geological structure. Being an unconventional reservoir of hydrocarbons, BVCHF has properties of a petroleum-bearing rock, one of the main characteristics of which is organic matter, its type and maturity. The paper presents the results of the study of organic matter by various methods at the micro level, as well as their integration with larger-scale studies. The need for detailed consideration of the organic matter of the BVCHF is justified by the fact that it has a mixed composition and, as a consequence, a different degree of transformation and spatial distribution.


Author(s):  
A. N. Glukhov ◽  
◽  
V. V. Priymenko ◽  
M. I. Fomina ◽  
V. V. Akinin ◽  
...  

The article presents new data on geology, mineralogy, and geochemistry of porphyry-copper, gold-silver, and silver-polymetallic ore occurrences in the Kongin magmatic zone of the Omolon terrane and granitoids, associated with it. It has been demonstrated that petrology and the age of granitoids are similar to those in the OCVB Penzhina segment. Mineralization of the Kongin zone is very close to that of the OCVB, differing in relatively high Mo in porphyry-copper ores and prevalence of silver-polymetallic mineralization over gold-silver.


2019 ◽  
Vol 10 (2) ◽  
pp. 459-470
Author(s):  
V. A. Kontorovich ◽  
В. V. Lunev ◽  
V. V. Lapkovsky

The article discusses the geological structure, oil‐and‐gas‐bearing capacities and salt tectogenesis of the Anabar‐Khatanga saddle located on the Laptev Sea shore. In the study area, the platform sediments are represented by the 14‐45 km thick Neoproterozoic‐Mesozoic sedimentary complexes. The regional cross‐sections show the early and middle Devonian salt‐bearing strata and associated salt domes in the sedimentary cover, which may be indicative of potential hydrocarbon‐containing structures. Diapirs reaching the ground surface can be associated with structures capable of trapping hydrocarbons, and typical anticline structures can occur above the domes buried beneath the sediments. In our study, we used the algorithms and software packages developed by A.A. Trofimuk Institute of Petroleum Geology and Geophysics (IPGG SB RAS). Taking into account the structural geological features of the study area, we conducted numerical simulation of the formation of salt dome structures. According to the numerical models, contrasting domes that reached the ground surface began to form in the early Permian and developed most intensely in the Mesozoic, and the buried diapirs developed mainly in the late Cretaceous and Cenozoic.


Author(s):  
V. Z. Kozin ◽  
A. S. Komlev

Processing plants are fed with ore with maximum size of 200-300 mm. Such ore is subjected to grab sampling which produces systemic error. Mechanical sampling has cumbersome equipment and is rarely introduced. The analysis and synthesis of mechanical sampling facilities allows an efficient approach to engineering and introduction of such equipment. The analysis is based on the calculation of random errors in sampling, preparation and examination of coarse samples. The calculations are performed in terms of copper and gold ore. The calculated relative errors of sampling, preparation and examination of samples show that sampling of copper and gold ores should be different. In terms of copper ore, it is important to increase the number of snap samples, while for gold ore, it is necessary to add the mass of the samples and add the gold sample preparation with concentration stages of coarse gold. In the article, five variants of coarse ore sampling are compared. The currently used variants of grab and mechanical sampling offer an acceptable result only with implementation of the proposed flowsheets. The look-ahead variants include disintegration of coarse particles and small mass sampling, or larger mass sampling directly on the conveyor. Both look-ahead variants need design studies and pilot testing. Examples of sampling circuit design are given, which offers an efficient tool for the analysis and synthesis of sampling circuits.


2018 ◽  
Vol 59 (11) ◽  
pp. 1482-1496 ◽  
Author(s):  
K.R. Kovalev ◽  
S.O. Syzdykov ◽  
Yu.A. Kalinin ◽  
E.A. Naumov ◽  
V.V. Baranov ◽  
...  
Keyword(s):  
Gold Ore ◽  

1912 ◽  
Vol 9 (4) ◽  
pp. 147-153
Author(s):  
J. Allan Thomson

Thanks to the descriptions published by visiting mining engineers and the more detailed work of the Geological Survey of the State, the general geological features of those parts of Western Australia in which mining is carried on are now well known. A surprising degree of uniformity of geological structure and mode of gold occurrence is revealed over an extent of country unparalleled elsewhere in the world. And yet it is safe to assume that to the casual reader who has not visited the country the above publications present little else than a mass of bewildering detail.“For reasons which can be readily understood, geological inquiry in Western Australia has up to the present consisted chiefly of a series of unconnected observations to the co-ordination of which we must look to the future.”


2020 ◽  
pp. 48-63
Author(s):  
Aleksandr Kokovkin

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.


Sign in / Sign up

Export Citation Format

Share Document