scholarly journals Geological Structure and Gold Mineralization of Carbonaceous Deposits of the Tyotechnaya Mountain (South Urals)

Author(s):  
A.V. Snachev ◽  
◽  
E.P. Shchulkin
Author(s):  
Z. Huang ◽  
J. Zheng

Hydrothermal alteration is an important content in the study of epithermal deposit, and its deep part is often accompanied by porphyry mineralization. The objective of research is to mapping the alteration minerals for mineral exploration using mixture tuned matched filtering (MTMF) approach based on airborne hyperspectral data CASI and SASI in Wuyi metallogenic belt, China, which has complex geological structure and excellent mineralization conditions and high regional forest coverage rate. Gold mineralization is closely related to the Yanshan period epithermal intrusive rocks, and often exists in external contact zone of allgovite, monzomite porphyrite, granite porphyry, quarz porphyry, et al.. The main mineral alteration types include silicification (quartz), sericitization (sericite, illite), pyritization (pyrite), chloritization (chlorite), and partial calcitization (calcite). The alteration minerals extraction based on integrated CASI_SASI reflectance data were processed by MTMF algorithm with the input imagery which was pre-processed by MNF and the input endmember spectra measured by SVC spectrometer to performs MF and add an infeasibility image. The MTMF results provide an estimate to mineral subpixel fractions leading to the abundances of alteration minerals at each pixel and alteration minerals distribution. The accuracy of alteration mineral extraction refers to the extent which it agrees with a set of reference data measured in the field reconnaissance. So the CASI_SASI airborne hyperspectral image provides the efficient way to map the detailed alteration minerals distribution for mineral exploration in high forest coverage area.


2021 ◽  
Vol 882 (1) ◽  
pp. 012047
Author(s):  
Wahyu Eko Junian ◽  
Andri Yadi Paembonan ◽  
Harnanti Y Hutami ◽  
Muhammad Arief Wicaksono

Abstract Cibaliung is an area that is traversed by the Au-Ag-Cu mineralization pathway from low to intermediate sulfide epithermal system. The implemented techniques for delineating probable gold deposits by the lithology contact and structures that control epithermal gold mineralization systems in the area include first vertical derivative (FHD), vertical derivative (VD), second vertical derivative (SVD), analytic signal (SA), and tilt angle (TA). The results shows that high continuity of anomaly contrast in the direction of Northwest (NW), North-Northwest (NNW), and North-Northeast (NNE) is presumed to be the target geological structure of the study area. Furthermore, the contrast value of magnetic anomaly represents the lithology contact lies in the direction of the West and the East of the area.


2021 ◽  
Author(s):  
S.K. Mustafin ◽  
◽  
A.V. Rasskazov ◽  
◽  

The state and prospects of development of phosphorite ore resources as agrochemical raw materials of the Russian Federation are analyzed. The geological structure, composition of ores and the prospects for forecasting, assessing and integrated development of phosphorite deposits of the South Ural phosphorite basin are characterized.


2020 ◽  
Vol 59 (3) ◽  
pp. 19-26
Author(s):  
Musab Awad Ahmed HASSAN ◽  
◽  
Aleksandr Evgen’yevich KOTEL’NIKOV ◽  

Relevance and purpose of the work. The study area is located in Gedarif state in Sudan. The ongoing work is aimed at solving fundamental problems of the geological structure of the Qala En Nahal-Um Saqata Ophiolitic Complex and applied tasks of mineral exploration. Detailed studies are being conducted for the first time in this area. The purpose of the investigation is to study the geological and structural features of the region, as well as to obtain information about the localization of gold mineralization. Methods of research. Within the study area, a geological mapping of the ophiolitic complex was carried out. It’s included an analysis of structural elements for investigation of the structural evolution and the phases of deformation. Chemical analysis of the mineralized quartz veins to determine the gold was carried out by Atomic Absorption Spectrometry (AAS) technique at the ALS Laboratory in Saudi Arabia. Results of the work. The investigation of the structural evolution revealed at least three phases of deformation. The gold mineralization occurs in auriferous quartz veins, which are hosted in metavocano-sedimentary, sheared synorogenic granites and listvenites. The auriferous quartz veins are structurally controlled by dominantly NE main shear directions. Conclusions. The gold mineralization in the area can be classified shear zone related mineralization, which is formed during the final event accomplished by crustal cooling, and formation of auriferous quartz vein along shear zones. Gold concentration were recorded in both quartz veins and associates alteration rocks. The area is promising for the presence of a gold deposit.


2021 ◽  
Author(s):  
A.V. Snachev ◽  
◽  
A.V. Kolomoets ◽  
M.A. Rassomakhin ◽  
V.I. Snachev ◽  
...  

The article discusses the geological structure of the Baikal deposit, located within the Kumak ore field and confined to the black shale of the Bredy Formation (C1bd). It has been established that the gold mineralization within the occurrence is confined mainly to the members of quartz-mica-tourmaline metasomatically altered carbonaceous shales. Gold is noted here in intergrowth with tourmaline. In terms of their chemical composition, tourmalines belong to dravite and foitite and are close to those of orogenic gold and gold-sulfide deposits. The close intergrowth of thin needle- like tourmaline and gold indicates the synchrony of their formation and allows the manifestation of Baikal deposit to be attributed to the quartz-tourmaline formation.


2021 ◽  
Author(s):  
А.V. Snachev ◽  
◽  
K.R. Nurieva ◽  
R.R. Islamov ◽  
◽  
...  

The article describes the geological structure of the Birgilda strata, which is widely developed in the East Ural trough. It is shown that the Birgilda black shales, which contain Corg in the range of 0.5–2.7% (average 1.3%), are of the low-carbon type. The exothermic effect in them occurred mainly in the temperature range 570–660 ° С, which corresponds to the greenschist facies of regional metamorphism. On the A-S-C diagram, the rocks of the Birgilda strata are approximately equally scattered over the carbonate-carbonaceous and siliceous-carbonaceous fields and noticeably less in the terrigenous-carbonaceous fields. The Birgilda sequence is characterized by a collisional environment of accumulation and products of destruction of mainly basic igneous rocks.


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


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