Pub Date : 2024-01-17DOI: 10.47765/0869-5997-2023-10017
Ilya Vikentyev, O. Vikentyeva, V. Blokov, R. Vykhristenko, Nadezhda Yushko, Lev Krinochkin
Spatial distribution of gold, copper, and iron ore deposits in the Northern Urals with the largest Turya-Auerbakh ore region is controlled by north-west trending linear zones of a probably fault nature. The influence has been demonstrated of regional factors (including the tectonic, magmatic, and geochemical ones) favoring formation of the large Au-As-Sb-Hg-Tl Vorontsovka deposit located within a volcanogenicsedimentary, substantially carbonate rock sequence. Closely spaced swarms of Devonian pre-ore and Carboniferous post-ore mafic dykes have been identified within the deposit. The primary geochemical halos of the Vorontsovka deposit have a multielement composition and, coupled with the ores, form a thick ore-halo zone confined to the gentle tectonic contact of sandstone-siltstone and limestone units. The main halo-forming elements are zonally distributed in the section. The footwall side of the gold deposit (rear zone) is dominated by Zn, Cd, Cu, Pb, Ag, and Bi; the axial zone, by Sb, Hg, Tl, and As; and the hanging side (frontal zone), by As, Zn, Hg, Pb, Ag, (Cu). In the east (closer to the Auerbakh granitoid massif), Ag, Zn, Pb, Mn, Y, Mo, and W relatively accumulate, while in the west (most remotely from the intrusive), Sb, Ba, As, Hg, Co, Ni, and Sn dominate. The 40Ar/39Ar age of ~391.1 million years, obtained for hydromica of the gold-arsenic ores, corresponds to the period of emplacement of granodiorite of the final Auerbakh massif intrusive phase. The conclusion is made on the crucial magmatic contribution to the formation of gold ores of the deposit.
北乌拉尔地区金、铜、铁矿床的空间分布，其中最大的图里亚-奥尔巴赫矿区受西北走向线性带控制，可能具有断层性质。区域因素（包括构造、岩浆和地球化学因素）对位于火山成因沉积岩、主要是碳酸盐岩序列中的大型金-锑-锑-汞-碲沃龙佐夫卡矿床的形成产生了有利影响。在该矿床内发现了成群的泥盆纪前矿体和石炭纪后矿体岩浆岩。沃龙佐夫卡矿床的主要地球化学晕具有多元素成分，与矿石一起形成了一个厚矿石晕带，局限于砂岩-粉砂岩和石灰岩单元的平缓构造接触面。形成矿晕的主要元素在剖面上呈带状分布。金矿床的脚墙一侧（后区）以 Zn、Cd、Cu、Pb、Ag 和 Bi 元素为主；轴向区以 Sb、Hg、Tl 和 As 元素为主；悬崖一侧（前区）以 As、Zn、Hg、Pb、Ag 和（Cu）元素为主。在东部（更靠近奥尔巴赫花岗岩群），银、锌、铅、锰、钇、钼和钨相对较多，而在西部（距离侵入体最远），锑、钡、砷、汞、钴、镍和锡占主导地位。金砷矿石水云母的 40Ar/39Ar 年龄约为 3.911 亿年，与奥尔巴赫地块侵入期最终阶段的花岗闪长岩成岩期一致。结论是岩浆对该矿床金矿石的形成起到了关键作用。
{"title":"New data on the geological structure and zonality of the Vorontsovka gold field in the Northern Urals","authors":"Ilya Vikentyev, O. Vikentyeva, V. Blokov, R. Vykhristenko, Nadezhda Yushko, Lev Krinochkin","doi":"10.47765/0869-5997-2023-10017","DOIUrl":"https://doi.org/10.47765/0869-5997-2023-10017","url":null,"abstract":"Spatial distribution of gold, copper, and iron ore deposits in the Northern Urals with the largest Turya-Auerbakh ore region is controlled by north-west trending linear zones of a probably fault nature. The influence has been demonstrated of regional factors (including the tectonic, magmatic, and geochemical ones) favoring formation of the large Au-As-Sb-Hg-Tl Vorontsovka deposit located within a volcanogenicsedimentary, substantially carbonate rock sequence. Closely spaced swarms of Devonian pre-ore and Carboniferous post-ore mafic dykes have been identified within the deposit. The primary geochemical halos of the Vorontsovka deposit have a multielement composition and, coupled with the ores, form a thick ore-halo zone confined to the gentle tectonic contact of sandstone-siltstone and limestone units. The main halo-forming elements are zonally distributed in the section. The footwall side of the gold deposit (rear zone) is dominated by Zn, Cd, Cu, Pb, Ag, and Bi; the axial zone, by Sb, Hg, Tl, and As; and the hanging side (frontal zone), by \u0000As, Zn, Hg, Pb, Ag, (Cu). In the east (closer to the Auerbakh granitoid massif), Ag, Zn, Pb, Mn, Y, Mo, and W relatively accumulate, while in the west (most remotely from the intrusive), Sb, Ba, As, Hg, Co, Ni, and Sn dominate. The 40Ar/39Ar age of ~391.1 million years, obtained for hydromica of the gold-arsenic ores, corresponds to the period of emplacement of granodiorite of the final Auerbakh massif intrusive phase. The conclusion is made on the crucial magmatic contribution to the formation of gold ores of the deposit.","PeriodicalId":19636,"journal":{"name":"Ores and metals","volume":" 347","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139618108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-17DOI: 10.47765/0869-5997-2023-10020
Chayana Khertek, Anatoly Sazonov
The richest gold placers periodically mined since 1838 are known in the north of the Republic of Tyva, within the basin of the Amyl and Sistig-Khem rivers. Ag-Au gold is the most common, and cuprous and mercuric varieties are presented in small quantities. Lode gold occurrences are confined to quartz veins and have no economic value. Detrital gold in the placer deposits has the typical typomorphic features of placer gold: roundness, compositional heterogeneity, the presence of rims and intergranular veinlets of high-fineness gold, and particle deformation structures. We have considered the transformation mechanisms of detrital gold within the mentioned placers due to the deforming interaction of transported particles in the sedimentogenic environment at the stage of motogenesis, as well as crystallophysical effects at the stage of syngenesis – early diagenesis during heterogeneous metasomatic recrystallization of endogenous gold under conditions of differential mobility of the main mineral-forming elements of gold, Au, Ag, Cu, and Hg. As a result, compositionally polyphase structures formed in the particle, they are high-fineness rims along the periphery of the particles, intergranular veins of high-fineness gold, deformation structures, and increased fineness in the particle kernels.
{"title":"Deformational and metasomatic transformations of detrital gold in the course of placer formation","authors":"Chayana Khertek, Anatoly Sazonov","doi":"10.47765/0869-5997-2023-10020","DOIUrl":"https://doi.org/10.47765/0869-5997-2023-10020","url":null,"abstract":"The richest gold placers periodically mined since 1838 are known in the north of the Republic of Tyva, within the basin of the Amyl and Sistig-Khem rivers. Ag-Au gold is the most common, and cuprous and mercuric varieties are presented in small quantities. Lode gold occurrences are confined to quartz veins and have no economic value. Detrital gold in the placer deposits has the typical typomorphic features of placer gold: roundness, compositional heterogeneity, the presence of rims and intergranular veinlets of high-fineness gold, and particle deformation structures. We have considered the transformation mechanisms of detrital gold within the mentioned placers due to the deforming interaction of transported particles in the sedimentogenic environment at the stage of motogenesis, as well as crystallophysical effects at the stage of syngenesis – early diagenesis during heterogeneous metasomatic recrystallization of endogenous gold under conditions of differential mobility of the main mineral-forming elements of gold, Au, Ag, \u0000Cu, and Hg. As a result, compositionally polyphase structures formed in the particle, they are high-fineness rims along the periphery of the particles, intergranular veins of high-fineness gold, deformation structures, and increased fineness in the particle kernels.","PeriodicalId":19636,"journal":{"name":"Ores and metals","volume":" 412","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139617970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-17DOI: 10.47765/0869-5997-2023-10016
T. Surin
The principal regularities of distribution of the VMS type mineralization in the Verkhneuralsk ore region in the Southern Urals are characterized. Metallogenic factors of the first kind (stratigraphic, magmatic, lithological, and tectonic) and of the second kind (geotectonic and paleovolcanic) are shown. A combined convective-postmagmatic ore formation model for the VMS is briefly described, that takes into account a genetic relationship of the VMS ore formation to silicic magmatism of the basalt-rhyolite (“contrast”) volcanic formation, four types of such relationship being distinguished, the spatial, temporal, energetic, and compositional ones. The geological, geochemical, and geophysical prospecting indicators for the Ural type VMS mineralization are presented separately for various classes of forecasting metallogenic areas (ore regions, ore clusters, and ore fields and deposits). In the southern portion of the ore district, a site promising for revealing a new ore deposit has been identified, for which the category P2 forecasted resources have been estimated and a recommendation has been given for the geological exploration.
{"title":"Paleovolcanism and the prospecting indicators and outlooks for discovery of new economic-grade copper-zinc massive sulfide ore deposits in the Verkhneuralsk ore region, Southern Urals","authors":"T. Surin","doi":"10.47765/0869-5997-2023-10016","DOIUrl":"https://doi.org/10.47765/0869-5997-2023-10016","url":null,"abstract":"The principal regularities of distribution of the VMS type mineralization in the Verkhneuralsk ore region in the Southern Urals are characterized. Metallogenic factors of the first kind (stratigraphic, magmatic, lithological, and tectonic) and of the second kind (geotectonic and paleovolcanic) are \u0000shown. A combined convective-postmagmatic ore formation model for the VMS is briefly described, that takes into account a genetic relationship of the VMS ore formation to silicic magmatism of the basalt-rhyolite (“contrast”) volcanic formation, four types of such relationship being distinguished, the spatial, temporal, energetic, and compositional ones. The geological, geochemical, and geophysical prospecting indicators for the Ural type VMS mineralization are presented separately for various classes of forecasting metallogenic areas (ore regions, ore clusters, and ore fields and deposits). In the southern portion of the ore district, a site promising for revealing a new ore deposit has been identified, for which the category P2 forecasted resources have been estimated and a recommendation has been given for the geological exploration.","PeriodicalId":19636,"journal":{"name":"Ores and metals","volume":" 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139616608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-17DOI: 10.47765/0869-5997-2023-10019
I. Starostin, Aleksander Chernykh, M. Girfanov
Regional-scale localization conditions of the Kyzyk-Chadr molybdenum-copper porphyry ore field in the southern folded frame of the Siberian Platform are considered. The porphyry mineralization of the field formed at the Salairian (Early Caledonian) phase of development of the Altai-Sayan segment of the Central Asian Orogenic Belt (CAOB), in connection with small intrusions of the gabbro-diorite-granodioritegranite Kyzykchadr Complex (Є2–3). The formation of the ore-bearing complex was associated with an accretionalcollisional magmatic belt superimposed on a Vendian–Early Cambrian volcanic-sedimentary island-arc substrate. The complex is only known within the local Ozhu uplifted block with a “batholitic” massif of the gabbrotonalite-plagiogranite Tannu-Ola Complex (Є2), but it is suggested that there could existed some analogous accretional-collisional Cambrian intrusions productive for Mo-Cu porphyry mineralization in some other areas, that were later overlapped by Ordovician–Silurian and Early Devonian volcanosedimentary deposits or broken by intrusive massifs of the Caledonian collisional volcano-plutonic belt. The rocks of the Salairian and Caledonian magmatic belts were deformed during subsequent geotectonic stages, primarily the Late Paleozoic collision, and overlain by younger sedimentary deposits. The position of economic-grade Mo and Mo-Cu porphyry deposits in the southern Altai-Sayan segment of the CAOB is assumed to be confined to areas of spatial superposition (overlapping) of magmatic belts of the three geotectonic stages: 1) island-arc volcanic belts (V–Є1), 2) “batholithic” intrusions and small intrusions of the magmatic belt of the accretional-collisional stage (Є2–3), 3) the collisional volcano-plutonic belt (O–D1).
{"title":"Paleogeotectonic position of the Kyzyk Chadr porphyry copper ore field, Republic of Tyva","authors":"I. Starostin, Aleksander Chernykh, M. Girfanov","doi":"10.47765/0869-5997-2023-10019","DOIUrl":"https://doi.org/10.47765/0869-5997-2023-10019","url":null,"abstract":"Regional-scale localization conditions of the Kyzyk-Chadr molybdenum-copper porphyry ore field in the southern folded frame of the Siberian Platform are considered. The porphyry mineralization of the field formed at the Salairian (Early Caledonian) phase of development of the Altai-Sayan segment of the \u0000Central Asian Orogenic Belt (CAOB), in connection with small intrusions of the gabbro-diorite-granodioritegranite Kyzykchadr Complex (Є2–3). The formation of the ore-bearing complex was associated with an accretionalcollisional magmatic belt superimposed on a Vendian–Early Cambrian volcanic-sedimentary island-arc substrate. The complex is only known within the local Ozhu uplifted block with a “batholitic” massif of the gabbrotonalite-plagiogranite Tannu-Ola Complex (Є2), but it is suggested that there could existed some analogous accretional-collisional Cambrian intrusions productive for Mo-Cu porphyry mineralization in some other areas, that were later overlapped by Ordovician–Silurian and Early Devonian volcanosedimentary deposits or broken by \u0000intrusive massifs of the Caledonian collisional volcano-plutonic belt. The rocks of the Salairian and Caledonian magmatic belts were deformed during subsequent geotectonic stages, primarily the Late Paleozoic collision, and overlain by younger sedimentary deposits. The position of economic-grade Mo and Mo-Cu porphyry deposits in the southern Altai-Sayan segment of the CAOB is assumed to be confined to areas of spatial superposition \u0000(overlapping) of magmatic belts of the three geotectonic stages: 1) island-arc volcanic belts (V–Є1), 2) “batholithic” intrusions and small intrusions of the magmatic belt of the accretional-collisional stage (Є2–3), 3) the collisional volcano-plutonic belt (O–D1).","PeriodicalId":19636,"journal":{"name":"Ores and metals","volume":" 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139616991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-09DOI: 10.47765/0869-5997-2023-10011
Aleksander Chernykh, Mikhail Girfanov, Valery Istomin, DMITRY Fedorov, Vladimir Pashkov, Andrey Svatkov
The countries of the Central Asian region of the CIS - the Republic of Kazakhstan, the Kyrgyz Republic, the Republic of Tajikistan, the Republic of Uzbekistan - have a powerful mineral resource base (MRB) covering almost the entire spectrum of mineral raw materials: ferrous, non-ferrous, noble, rare metals and combustible minerals. The foundation of this wealth was laid during the existence of the Soviet Union, when the joint efforts of the union republics carried out a systematic geological study of their territory and created the mining industry and metallurgy. The article discusses the state of MRB and mining production of mineral raw materials in the region, primarily regarding “basic” non-ferrous (copper, lead, zinc, nickel) and precious (gold and silver) metals.
{"title":"Mineral resource base of the CIS countries of the Central Asian region: status, areas of interaction and development","authors":"Aleksander Chernykh, Mikhail Girfanov, Valery Istomin, DMITRY Fedorov, Vladimir Pashkov, Andrey Svatkov","doi":"10.47765/0869-5997-2023-10011","DOIUrl":"https://doi.org/10.47765/0869-5997-2023-10011","url":null,"abstract":"The countries of the Central Asian region of the CIS - the Republic of Kazakhstan, the Kyrgyz Republic, the Republic of Tajikistan, the Republic of Uzbekistan - have a powerful mineral resource base (MRB) covering almost the entire spectrum of mineral raw materials: ferrous, non-ferrous, noble, rare metals and combustible minerals. The foundation of this wealth was laid during the existence of the Soviet Union, when the joint efforts of the union republics carried out a systematic geological study of their territory and created the mining industry and metallurgy. The article discusses the state of MRB and mining production of mineral raw materials in the region, primarily regarding “basic” non-ferrous (copper, lead, zinc, nickel) and precious (gold and silver) metals.","PeriodicalId":19636,"journal":{"name":"Ores and metals","volume":"2016 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135141968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-09DOI: 10.47765/0869-5997-2023-10012
Ivan Gaskov
The Altai of Russia in the geological and metallogenic sense includes the Altai Mountains and the northwestern part of Rudny Altai, and in administrative terms - the Altai Territory and the Altai Republic. Gorny Altai has experienced a complex history of geological development, including subduction, accretion-collision and rifting processes with the formation of various types of magmatism and endogenous gold mineralization. The history of gold mining in the region is associated mainly with placers and currently the reserve of placer gold deposits is almost exhausted, and the prospects for primary mineralization have been little studied. In this regard, the problem of assessing the potential of ore gold in known ore occurrences and promising areas of ore clusters has become urgent in the region.In the Russian part of Rudny Altai, gold reserves are mainly associated with gold-bearing pyrite-polymetallic deposits and less with small gold ore occurrences.Gold-sulfide-skarn, epithermal gold-silver, copper-gold-porphyry and gold-mercury types of mineralization may have important practical significance for the region. The increase in ore gold reserves in the Russian part of Rudny Altai is mainly due to additional exploration of pyrite-polymetallic deposits.
{"title":"Endogenous gold of the russian Altai","authors":"Ivan Gaskov","doi":"10.47765/0869-5997-2023-10012","DOIUrl":"https://doi.org/10.47765/0869-5997-2023-10012","url":null,"abstract":"The Altai of Russia in the geological and metallogenic sense includes the Altai Mountains and the northwestern part of Rudny Altai, and in administrative terms - the Altai Territory and the Altai Republic. Gorny Altai has experienced a complex history of geological development, including subduction, accretion-collision and rifting processes with the formation of various types of magmatism and endogenous gold mineralization. The history of gold mining in the region is associated mainly with placers and currently the reserve of placer gold deposits is almost exhausted, and the prospects for primary mineralization have been little studied. In this regard, the problem of assessing the potential of ore gold in known ore occurrences and promising areas of ore clusters has become urgent in the region.In the Russian part of Rudny Altai, gold reserves are mainly associated with gold-bearing pyrite-polymetallic deposits and less with small gold ore occurrences.Gold-sulfide-skarn, epithermal gold-silver, copper-gold-porphyry and gold-mercury types of mineralization may have important practical significance for the region. The increase in ore gold reserves in the Russian part of Rudny Altai is mainly due to additional exploration of pyrite-polymetallic deposits.","PeriodicalId":19636,"journal":{"name":"Ores and metals","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135141987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The study of the spatiotemporal relationships of metasomatites and ores of various zones of the epithermal Au-Ag deposit Svetloe (Khabarovsk Region) using a traditional mineralogical and petrographic approach made it possible to establish several stages of ore formation confined to two paleovolcanic structures of the central type. The early stage corresponds to the moderately acidic (IS) type of mineralization, the second stage of ore formation corresponds to the acidic sulfate (HS) type.Gold mineralization associated with the early stage of ore formation is represented by two main types: Au-Ag-Te and Au-Ag. The late stage of mineralization is characterized by the predominance of redeposited high-grade gold, as well as the presence of other native elements: tellurium, selenium, sulfur, and bismuth.
{"title":"The main stages of ore formation of the Svetloe epithermal gold deposit (Khabarovsk Region) based on the study of the mineral composition of metasomatic rocks and ores","authors":"Daria Levochskaya, TAMARA Yakich, DMITRY Lesnyak, Maxim Rudmin, Aleksey Ruban, Aleksey Erofeev, Aleksey Mazurov","doi":"10.47765/0869-5997-2023-10013","DOIUrl":"https://doi.org/10.47765/0869-5997-2023-10013","url":null,"abstract":"The study of the spatiotemporal relationships of metasomatites and ores of various zones of the epithermal Au-Ag deposit Svetloe (Khabarovsk Region) using a traditional mineralogical and petrographic approach made it possible to establish several stages of ore formation confined to two paleovolcanic structures of the central type. The early stage corresponds to the moderately acidic (IS) type of mineralization, the second stage of ore formation corresponds to the acidic sulfate (HS) type.Gold mineralization associated with the early stage of ore formation is represented by two main types: Au-Ag-Te and Au-Ag. The late stage of mineralization is characterized by the predominance of redeposited high-grade gold, as well as the presence of other native elements: tellurium, selenium, sulfur, and bismuth.","PeriodicalId":19636,"journal":{"name":"Ores and metals","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135142241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-09DOI: 10.47765/0869-5997-2023-10015
Nikolai Pak, Elena Ivleva, Vitali Shatov, Nadezhda Shatova, Anna Goncharenko
In the Aktyuz-Boordinsky ore district in the Northern Tien Shan, numerous deposits and ore occurrences of gold, rare and rare earth metals and base metals are discovered. Gold deposits are characterized by the presence of a number of metasomatites: beresites, listvenites, K-feldspatites, etc. Many of them are also characterized by quartz-tourmaline gold-bearing metasomatites. A mineralogical and petrographic description of the metasomatic zoning of quartz-tourmaline metasomatites from weakly to highly altered zones is given. Quartz-tourmaline metasomatites form vein-like bodies and metasomatic breccias, where they act as cement, and the fragments can consist of intrusive rock, beresites, K-feldspatites, and listvenites. For the Aktyuz-Boordinsky ore district, quartz-tourmaline metasomatites are a prospecting feature for gold, and for other areas they are a prospecting criterion.
{"title":"Quartz-tourmaline metasomatites in gold deposits in Aktyuz-Boоrdinsky ore district (Northern Tien Shan, Kyrgyzstan)","authors":"Nikolai Pak, Elena Ivleva, Vitali Shatov, Nadezhda Shatova, Anna Goncharenko","doi":"10.47765/0869-5997-2023-10015","DOIUrl":"https://doi.org/10.47765/0869-5997-2023-10015","url":null,"abstract":"In the Aktyuz-Boordinsky ore district in the Northern Tien Shan, numerous deposits and ore occurrences of gold, rare and rare earth metals and base metals are discovered. Gold deposits are characterized by the presence of a number of metasomatites: beresites, listvenites, K-feldspatites, etc. Many of them are also characterized by quartz-tourmaline gold-bearing metasomatites. A mineralogical and petrographic description of the metasomatic zoning of quartz-tourmaline metasomatites from weakly to highly altered zones is given. Quartz-tourmaline metasomatites form vein-like bodies and metasomatic breccias, where they act as cement, and the fragments can consist of intrusive rock, beresites, K-feldspatites, and listvenites. For the Aktyuz-Boordinsky ore district, quartz-tourmaline metasomatites are a prospecting feature for gold, and for other areas they are a prospecting criterion.","PeriodicalId":19636,"journal":{"name":"Ores and metals","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135093954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-09DOI: 10.47765/0869-5997-2023-10014
Yuri Nikolaev, Irina Balykova, Sergei Kuzin, Ivan Baksheev, Andrey Apletalin, Vsevolod Prokofiev, Evgeni Vlasov, Ildar Kalko, Valery Kosyatov
Gold deposits associated with granitoid intrusions have long been known. Recently, a class of deposits was identified among them, called intrusion-related granite systems, IRGS (gold-rare metal formation). The standards of the geological prospecting model for them are the deposits of the Tintin metallogenic belt (Alaska, Canada). In Russia, this type has been studied less; IRGS includes the Shkolnoye and Butarnoye (Magadan region) and Kekura (Chukotka) deposits. Based on field and laboratory studies, generalization of prospecting geological and geochemical data, the characteristics and localization features of gold mineralization associated with granitoids of a large igneous uplift in the South Anyui structural-formational zone (Western Chukotka) were determined. The mineral composition of ores, the sequence of their formation were studied, homogenization temperatures and salt concentrations in gas-liquid inclusions were determined. The geochemical and mineralogical zoning of the ore-magmatic system has been identified, and criteria have been developed for assessing erosion and predicting gold mineralization to depth.
{"title":"Composition, formation conditions, distribution patterns and zoning of gold mineralization in the Stadukhinsky ore-placer region (Western Chukotka)","authors":"Yuri Nikolaev, Irina Balykova, Sergei Kuzin, Ivan Baksheev, Andrey Apletalin, Vsevolod Prokofiev, Evgeni Vlasov, Ildar Kalko, Valery Kosyatov","doi":"10.47765/0869-5997-2023-10014","DOIUrl":"https://doi.org/10.47765/0869-5997-2023-10014","url":null,"abstract":"Gold deposits associated with granitoid intrusions have long been known. Recently, a class of deposits was identified among them, called intrusion-related granite systems, IRGS (gold-rare metal formation). The standards of the geological prospecting model for them are the deposits of the Tintin metallogenic belt (Alaska, Canada). In Russia, this type has been studied less; IRGS includes the Shkolnoye and Butarnoye (Magadan region) and Kekura (Chukotka) deposits. Based on field and laboratory studies, generalization of prospecting geological and geochemical data, the characteristics and localization features of gold mineralization associated with granitoids of a large igneous uplift in the South Anyui structural-formational zone (Western Chukotka) were determined. The mineral composition of ores, the sequence of their formation were studied, homogenization temperatures and salt concentrations in gas-liquid inclusions were determined. The geochemical and mineralogical zoning of the ore-magmatic system has been identified, and criteria have been developed for assessing erosion and predicting gold mineralization to depth.","PeriodicalId":19636,"journal":{"name":"Ores and metals","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135141713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-11DOI: 10.47765/0869-5997-2023-10008
A. Bolonin, I. Myznikov, Alla Nigmatullina
In West Africa, in the southeastern Guinea, in the Simandou Range region underlain by the Archean gneiss-granite basement, a north–south synclinorium structure is extended, that is composed of the Lower Proterozoic series of metamorphic rocks. A thick sequence of the banded iron formation (itabirites) with interlayers of phyllites and mica schists is exposed in cores of the synclines. According to their composition, the itabirites are subdivided into quartz-magnetite and amphibole-quartz-magnetite varieties. High-grade iron ores (60–66% Fe) formed in a pseudomorphic manner after the itabirites in the Cenozoic lateritic weathering crust. At the North Simandou, Zogota, and Pic-de-Fon deposits, the rich ores compose mantle-shaped orebodies up to 150–350 m deep. The orebodies possess the following vertical zonality: primary magnetite itabirites – martitized itabirites – quartz-martite friable ore – martite friable ore and martite–limonite friable ore – goethite-hematite friable to solid ore – deluvial limonite ore (kanga and cuirass). All the types of the high-grade ores are dominated by hematite. The rich iron ores were formed from itabirites as a result of the oxidation of magnetite to martite, the almost complete removal of silica, and the subsequent additional supply of iron and its precipitation in the form of hydroxides. During the formation of the iron ores, kaolin clays and bauxites were formed after the phyllite interlayers.
{"title":"High-grade iron ores in the laterite weathering crust after the banded iron formation in the Simandou mountain range, Republic of Guinea","authors":"A. Bolonin, I. Myznikov, Alla Nigmatullina","doi":"10.47765/0869-5997-2023-10008","DOIUrl":"https://doi.org/10.47765/0869-5997-2023-10008","url":null,"abstract":"In West Africa, in the southeastern Guinea, in the Simandou Range region underlain by the Archean gneiss-granite basement, a north–south synclinorium structure is extended, that is composed of the Lower Proterozoic series of metamorphic rocks. A thick sequence of the banded iron formation (itabirites) with interlayers of phyllites and mica schists is exposed in cores of the synclines. According to their composition, the itabirites are subdivided into quartz-magnetite and amphibole-quartz-magnetite varieties. High-grade iron ores (60–66% Fe) formed in a pseudomorphic manner after the itabirites in the Cenozoic lateritic weathering crust. At the North Simandou, Zogota, and Pic-de-Fon deposits, the rich ores compose mantle-shaped orebodies up to 150–350 m deep. The orebodies possess the following vertical zonality: primary magnetite itabirites – martitized itabirites – quartz-martite friable ore – martite friable ore and martite–limonite friable ore – goethite-hematite friable to solid ore – deluvial limonite ore (kanga and cuirass). All the types of the high-grade ores are dominated by hematite. The rich iron ores were formed from itabirites as a result of the oxidation of magnetite to martite, the almost complete removal of silica, and the subsequent additional supply of iron and its precipitation in the form of hydroxides. During the formation of the iron ores, kaolin clays and bauxites were formed after the phyllite interlayers.","PeriodicalId":19636,"journal":{"name":"Ores and metals","volume":"275 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76632964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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