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Chemical and physical characteristics of quartz from gold deposits in the North China platform: relationship to gold mineralization

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Acta Geochimica 2021年第6期40卷 998-1022页

作者： Jianzhao Yin Yang Liu Hongyun Shi Orient Resources Ltd 9280 Kirkmond CrescentRichmondBritish Columbia V7A 1M8Canada Institute of Mineral Resources Research Guomen Business CenterChina Metallurgical Geology BureauThe Airport East Road#3 Building2AShunyi DistrictBeijing 101300China Bureau Veritas Commodities Canada Ltd. 11620 Horseshoe WayRichmondBritish Columbia V7A 4V5Canada

This paper seeks to identify macroscopic metallogenic mechanisms of various mineral deposits by studying microscopic typomorphic characteristics of typical minerals associated with the deposits and to reveal the mechanism of lattice gold in detail by studying both physical and chemical characteristics of quartz from representative gold deposits in the North China *** part of their extensive research,the authors examine the relationship between trace elements with wall rock,the ore-forming media,and gold immigration of various types of gold deposits,including their salinity,type,*** are key factors to revealing the mineralization mechanism,and indicators for mineral prospecting,exploration,mining,and metallurgical *** order to address the questions posed,the following methods were used:field investigations of geology and sampling of the representative gold deposits,physical study and chemical analysis of quartz including,but not limited to,fluid inclusions as well as their compositions and trace elements in quartz,the unit cell parameters,electron paramagnetic resonance spectrum(EPR),and infrared spectroscopic analysis(ISA).As a result of this study,the authors observe the following key findings:unit cell parameters of quartz vary with their contents of foreign elements including gold,paragenetic stage,wall rock type,and other factors;the higher the forming temperature and the lower the gold content in quartz,the smaller the unit cell parameters,and vice ***,the EPR absorption lines resulted from the O–Al defect *** density of these types of hole centers increases and the EPR signal strengthens when the temperature *** on the findings,the authors conclude that lattice gold exists in ***,in the form of Au^(+)and/or Au^(3+),entering quartz and producing an electron–hole center,namely,the O-Au hole center,makes the center produce spin resonance absorption and results in the EPR absorption peak#I.B

关键词： Physical and chemical characteristics Quartz gold mineralization Unit cell parameter Electron paramagnetic resonance spectrum Infrared spectrum

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New Zircon U-Pb Age of the Badu Dolerite:Implications for Yanshanian Magmatic gold mineralization within the Youjiang Basin, Southwest China

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Acta Geologica Sinica(English Edition) 2018年第3期92卷 1272-1273页

作者： WU Songyang HOU Lin DING Jun LIU Shusheng ZHANG Qiming ZHAO Zhenyu Chengdu Center China Geological Survey School of Geosciences and Resources China University of Geosciences

Objective The Youjiang basin,also named"Dian-Qian-Gui golden Triangle",contains a cluster of Carlin-like gold deposits(Deng and Wang,2016).Due to the uncertainty of mineralization age and the absence of coetaneous magmatic rocks(Chen et al.,2015),the relationship between magmatism and Au mineralization still remains controversial in recent years(Hou et al.,2016).The Late

关键词： New Zircon U-Pb Age gold mineralization

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gold mineralization in the Guilaizhuang deposit,southwestern Shandong Province,China:Insights from phase relations among sulfides,tellurides,selenides and oxides

Gold mineralization in the Guilaizhuang deposit,southwestern...

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中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Wen-Gang Xu Hong-Rui Fan Fang-Fang Hu M.Santosh Kui-Feng Yang Ting-Guang Lan Bo-Jie Wen Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences China University of Geosciences(Beijing)

The Guilaizhuang gold deposit is composed of limestone- and breccia-type *** the limestone ores,gold is hosted by pyrite,As-bearing pyrite and arsenopyrite,whereas in the breccia ores,tellurides are the main gold *** often isomorphously substitutes for sulfur in sulfides in the limestone ores,but occurs as selenides in the breccia *** is the only oxide in the breccia ores,associated with barite and other *** this paper,the thermodynamic parameters,especially the Gibbs free energies of formation and reaction,of related sulfides,tellurides,selenides and oxides are computed to explain the distinct mineral styles in the limestone- and breccia-type *** construct the phase relations among minerals delineated by phase diagrams at 250 ℃,the temperature for gold precipitation in the Guilaizhuang *** to the phase relations between sulfides and selenides,we propose that gold has been transported as[Au(HS,HSe)]-,and released during rapid formation of pyrite,As-pyrite and arsenopyrite,at log/S(g) between —12.8 and— 11.4(250 ℃).In the breccia ores,log/Te(g) and log/Se(g) are constrained within —12.9 to —9.4,and —12.4 to —6.9(250 ℃),respectively,based on the mineral assemblages observed in the *** phase relations between tellurides and selenides indicate that calaverite,the only stable gold telluride mineral in nature,was not stable in the breccia ores at 250 ℃ during the gold *** on EMPA analysis,the so-called "calaverite" revealed from microscopic observations is in fact Au-Ag telluride,probably derived from the decomposition of sylvanite(AuAgTe) and petzite(AuAgTe),the only two stable Au-Ag tellurides in nature at high ***,we do not exclude the possibility that calaverite occurs in this deposit,which may have precipitated in early relatively high tellurium concentration stage preceding gold *** was not detected in gold-bearing tellurides,implying that selenide is unr

关键词： gold mineralization Sulfide Telluride Selenide Phase relation Guilaizhuang gold deposit China

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Characteristics of gold mineralization at the Baguiomo gold Panning Site, Koudougou Region, Burkina Faso, West Africa

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Open Journal of Geology 2024年第1期14卷 1-18页

作者： Pascal Ouiya Aziz Fayçal Tarnagda Martial Eric Fozing Ecole Normale Supérieure (ENS) Institut Sciences et Technologie (IST) Ouagadougou Burkina Faso Laboratoire Géosciences et Environnement (LaGE) Earth Sciences Department Ouagadougou Burkina Faso Department of Geology University of Dschang Dschang Cameroon

The Birimian Baguiomo formations are located in the northern part of the Boromo greenstone belt. In this belt, the volcanic rocks (tholeiitic basalt, calcalkaline basalt, andesite) hosting the gold mineralization are located in the Kwademen-Baguiomo shear zone. This mineralization, located only a few kilometers from the Kwademen gold deposit, is uncharacterized and, together with the latter, could constitute a gold potential capable of being economically exploitable. It is in this sense that this work is carried out with a view to characterizing the gold mineralization of the Baguiomo gold panning site. To carry out this work, we have made direct field measurements, combined with microstructures, and combined all this with data from geochemical rock analysis of the basalts that are the main host formations. Geochemical data show that tholeitic basalts formed from a mantle plume that was emplaced in an oceanic plateau context. Calc-alkaline basalts and andesites are comparable to Paleoproterozoic tholeitic basalts (PTH3), which are slightly enriched in light rare earths. Fertility tests show that these basalts concentrate between 3 and 6 ppb of gold at the time of accretion, which is sufficient for remobilization of this primary gold during the Eburnian orogeny to yield a deposit of around 4 - 5 Moz. gold mineralization is associated with pyrite crystals when the latter are disseminated in the rock mass, whereas it is associated with hematite in quartz veins concordant with S1 shear deformation. It is mainly the pyrite crystals in the pressure shadows that contain the gold grains, whose development would be synchronous with micro-shear zone reactivation during the first phase of D1B deformation. The second phase of D2B deformation, which is a crenulation or fracture schistosity, does not significantly affect the shear deformation that controls mineralization.

关键词： Kwademen-Baguiomo Shear Zone gold Panning Site gold mineralization Eburnian Orogeny

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2.5D Crustal Models Derived from Analytical Polynomial Separation Technique and Spectral Analysis of Gravity Data with Their Probable gold mineralization Migrations (Batouri, SE-Cameroon)

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Advances in Remote Sensing 2021年第1期10卷 1-24页

作者： Ngoumou Paul Claude Assembe Stephane Patrick Owono Amougou Olivier Ulrich Igor Meying Arsene Yandjimaing Justine Ngoh Jean Daniel Pepogo Man-Mvele Augustin Didier School of Geology and Mining Engineering University of Ngaoundere Meiganga Cameroon Postgraduate School of Technology Science and Geoscience University of Yaoundé I Yaoundé Cameroon Department of Physics Faculty of Science University of Bamenda Bambili Cameroon Department of Physics Faculty of Science University of Yaoundé I Yaoundé Cameroon

Geophysical surveying is crucial in the investigation of mineral resources in poorly exposed areas such as SE-Cameroon, a region known for its gold mineral potential. In this paper, gravity survey is carried out in the Batouri area, SE-Cameroon based on land gravity data from the Centre-south Cameroon. Therefore, an analytical polynomial separation program, based on least-square fitting of a third-degree polynomial surface to the Bouguer anomaly map, was used to separate the regional/residual components in gravity data. This technique permitted to better understand the disposition of the deep and near surface structures responsible of the observed anomalies in the Batouri area. Spectral analysis and 2.5D modelling of two profiles P1 (SW-NE) and P2 (N-S) selected from the residual anomaly map provided depths to basement. These depths constrain the gravity models along the profiles, indicating a variable thickness of the sedimentary infill with an approximate anomaly of -33 mGal. The 2.5D model of the basement shows a gravity body, with a signature suggesting two close and similar masses, which characterize the quartz-bearing formations associated here to granite and gneiss. Our work highlights a main heavy gravity: Gwé-Batouri anomaly, containing the major part of auriferous deposits located along the NE-SW direction. Further, three tectonic sub-basins bounded by normal faults have been highlighted at Guedal, Gwé, and Bélimban, in the south of Guedal-Bélimban depression. They are associated with the extension tectonics, more or less vertical tangential cuts and accidents that have affected the r

关键词： Gravity Anomaly SE-Cameroon Polynomial Technique Spectral Analysis 2.5D Modelling gold mineralization Batouri Area

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Lithostructural Control of the gold mineralization of the Douta Permit of African Star Resources (Kédougou-Kéniéba Inlier, Southeastern Senegal)

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International Journal of Geosciences 2024年第4期15卷 303-333页

作者： Masse Ndour Papa Moussa Ndiaye Koffi Félix Ekra Alain Ndong Malick Faye Pierre Ndour African Star Resources Yoff Dakar S&#233n&#233gal Dé partement de G&#233ologie Universit&#233 Cheikh Anta Diop Dakar S&#233n&#233gal

The Douta permit of African Star Resources/Thor Explorations, located in the southeast of Senegal, in the Kédougou-Kéniéba Inlier (western part of the West African Craton), is dominated to the East by metasedimentary formations such as greywackes, shales, graphitic shales, quartzites, cherts, claystones and breccias characteristic of the Dialé-Daléma basin. To the West, the mafic formations of the Mako volcanic belt are the most common. Metasedimentary rocks are associated with metavolcanosedimentary terms found at the contact zones between the two (2) Birimian groups. These different geological formations are cut by mafic dolerite and gabbro sills and/or dykes, as well as quartz and microgranite veins. The Douta gold project is crossed from North to South by the MTZ (Main Transcurrent Zone), generally oriented NE-SW and becoming N-S towards the North. The permit is characterized by several shear corridors. The rocks are affected by brittle, brittle-ductile to ductile deformations. The gold mineralization is hosted by a NE-trending shear corridor called the Makosa corridor (Makosa shear zone), therefore sub-parallel to the MTZ. It has a subvertical dip (75˚ to 85˚ to the NW). It is associated with a hydrothermal phase characterized by quartz-sericite-epidote-fine, disseminated pyrite and arsenopyrite ± albite ± chlorite paragenesis. These minerals testify to the existence of a low degree of metamorphism (greenschist facies, epizonal domain) in the area. However, metamorphism reaches amphibolite facies in some places, particularly in the vicinity of intrusive bodies, with the presence of hornblende (amphiboles) and plagioclase. The gold mineralization is mainly hosted by two (2) metasedimentary lithological units: meta-greywackes and shales.

关键词： Douta Kédougou-Kéniéba Inlier Senegal Metasedimentary MTZ Control gold mineralization Makosa Corridor

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Mapping and Petro-Structural Study of Northern Komborodougou Formations, in Korhogo gold District: A Substantial Contribution to the Discovery of a Potential gold mineralization in Birimian Greenstone Belts

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International Journal of Geosciences 2022年第10期13卷 855-874页

作者： Houssou N’Guessan Nestor Allialy Marc Ephrem Adingra Martial Pohn Koffi Pria Koffi Kossonou Jean-Marie Koffi N’guessan Martial Ahossi Loba Gbriga Franck Cyrille UFHB University of Felix Houphou&#235 t-Boigny Abidjan UFR Earth Sciences and Mineral Resources Abidjan C&#244 te d’Ivoire UJLoG University of Jean Lorougnon Guede Daloa C&#244 te d’Ivoire CAREM Sarl Abidjan C&#244 te d’Ivoire

The gold District of Korhogo, in the northern region of C?te d’Ivoire, holds enormous potential for gold mineralizations, some of which are under exploration phase and others in exploitation phase (example of Tongon gold Mine). Dormant since 1998, Mapping Services of most of the West African countries hardly provide geological maps at the scales of: 1/200,000, 1/50,000 and 1/25,000. This situation of unavailability of detailed geological maps does not help mining operators in the selection of prolific areas and also in the interpretation of in soil geochem anomies or gold mineralizations. Consequently, during the years 2020 and 2021, we have undertaken a campaign of geological mapping and petro-structural study of the northern sector of Komborodougou, located in the southern extension of Banfora Birimian Belt. This work, which allowed the realization of a geological map at 1/20,000 scale, reveals that: the mapped area includes three (3) major lithological units: 1) a volcano-sedimentary unit made up of metasediments (metaarenites, metasiltites and metaflyschs) and metavolcanites (metabasalts), which are metamorphosed and outcrop in the form of schists;2) a metaplutonic and intrusive unit composed on the one hand of quartz-diorites and metagabbros, and on the other hand of granites and granodiorites;3) and finally, a unit of dikes formed by microgranites, microgabbros, aplites and quartzites. The volcano-sedimentary complex is affected by a regional fold with an axis subparallel to the regional tectonic grain and an S1 schistosity oriented NE-SW to NNE-SSW with steep dips (>60o), except for those of the metaflyschs which are weak (o);a regional NW-SE compression would be at the origin of the setting of this schistosity. The volcano-sediment and metaplutonite complex is crossed in a NNE-SSW direction by a senetral shear-zone or main shear-zone and secondary shear-zones oriented sometimes NE-SW or N-S. These shear-zones are intersected by more or less dextral or senest

关键词： Geological Mapping Petro-Structural gold mineralization Komborodougou Côte d’Ivoire

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Relationship between CO_2-bearing fluid and gold mineralization in Haigou gold deposit of Jilin

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Global Geology 2015年第1期18卷 1-9页

作者： GAO Song PENG Xiaolei SUN Jinggui FU Lingzhi WANG Jianyu College of Earth Sciences Jilin University Jilin Haigou gold Mining Co. LTD

Haigou gold deposit is a typical orogenic gold deposit. There are a reasonable amount of fluid inclusions in the gold deposit,including three types: CO2-H2O-Na Cl inclusions,pure CO2 inclusions and Na Cl-H2 O inclusions,of which most of them are CO2-bearing inclusions. The fluid salinity is 1. 43%- 9. 08%,mainly concentrated in the range of 4. 69%- 5. 41%,the density of CO2 is 0. 69- 0. 80 g / cm3,indicating that the mineralization fluid is low-medium salinity and low density fluid. A series of studies on gold-bearing quartz vein and fluid inclusions show that there exists a positive correlation between the degree of the gold mi-neralization and the amount of CO2 in the inclusions,which means the more CO2-bearing inclusions there are,the higher the content of gold is. CO2 is mainly derived from mantle fluid,and the ore-forming fluid should be derived from mantle fluid and the crust shallow fluid. The conclusions have important denotative meaning on the metallogenic mechanism of orogenic gold deposit and the deep prospecting on metal deposit.

关键词： Haigou gold deposit CO2 fluid gold mineralization orogenic gold deposit ore-forming fluid

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A review of the geodynamic setting of large-scale Late Mesozoic gold mineralization in the North China Craton:an association with lithospheric thinning

A review of the geodynamic setting of large-scale Late Mesoz...

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中国科学院地质与地球物理研究所2003学术年会

作者： Simon A.Wilde Department of Applied Geology Curtin University of TechnologyP.O.Box U1987PerthWesternAustralia 6845Australia

Abundant gold deposits are distributed along the margins of the North China Craton(NCC).Occurring throughout the Precambrian basement and located in or proximal to Mesozoic granitoids,these deposits show a consistent spatial -temporal association with Late Jurassic-Early Cretaceous magmatism and are characterized by quartz lode or disseminated styles of mineralization with extensive alteration of wall *** ages are mainly Early Cretaceous(130-110 Ma) and constrain a very short period of ***-Nd-Pb isotopic tracers of ores,minerals and associated rocks indicate that gold and associated metals mainly were derived from multi-sources,i.e.,the wall rocks(Precambrian basement and Mesozoic granites) and associated mafic rocks. Previous studies,including high surface heat flow,uplift and later basin development,slow seismic wave speeds in the upper mantle,and a change in the character of mantle xenoliths sampled by Paleozoic to Cenozoic magmas,have been used to suggest that ancient,cratonic mantle lithosphere was removed from the base of the NCC some time after the Ordovician,and replaced by younger,less refractory lithospheric *** geochemistry and isotopic compositions of the mafic rocks associated with gold mineralization(130-110 Ma) indicate that they were derived from an ancient enriched lithospheric mantle source;whereas,the mafic dikes and volcanic rocks younger than 110 Ma were derived from a relatively depleted mantle source,i.e.,asthenospheric *** to their age and sources,relation to magmatism and geodynamic framework,the gold deposits were formed during lithospheric *** removal of lithospheric mantle and the upwelling of new asthenospheric mantle induced partial melting and dehydration of the lithospheric mantle and lower crust due to an increase of *** fluids derived from the lower crust were mixed with magmatic and meteoric waters,and resulted in the deposition of gold and associated metals.

关键词： gold mineralization Early Cretaceous Lithospheric thinning North China Craton

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Characteristics of gold and Its mineralization Style in the Boulon Djounga Eastern Perimeter of Liptako Mining Company (Central Southwestern Niger)

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Natural Resources 2024年第1期15卷 28-50页

作者： Gambo Ranaou Noura Kamayé Tourba Karimou Dia Hantchi Bouba Hassane Moussa Konaté Department of Geology Faculty of Science and Techniques Abdou Moumouni University Niamey Niger Department of Geology Faculty of Science and Techniques Dan Dicko Dankoulodo University Maradi Niger

The Boulon Djounga eastern perimeter is part of the Tiawa operating permit of the Société des Mines du Liptako (SML), located in the central southwestern part of Liptako (Niger). In this study, we used field data, Reverse Circulation (RC) surveys and chemical analyzes of gold to determine the characteristics of gold and its mineralization style. The eastern perimeter of Boulon Djounga is represented by a succession of metabasalts and metasediments both intersected by intrusions of quartz and dolerite dykes, and covered by sandstone and clayey rocks. gold is present in low contents (0.00 - 0.30 ppm) in the sedimentary cover and in medium (0.30 - 1.00 ppm) or high contents (1.00 - 4.534 ppm) in the metasediments, and in the gray quartz veins and locally in the volcanics. It exists in a disseminated state or in a concentrated state in the surrounding areas in the form of discrete grains associated with sulphurous minerals (pyrite: FeS2, chalcopyrite: CuFeS2 or arsenopyrite: FeAsS). The presence of gold in the quartz veins, and the NE-SW and NW-SE orientations of the ore bodies suggest that the eastern Boulon Djounga gold mineralization would be established during a late magmatic extensive phase.

关键词： Liptako gold mineralization Metasediments-Volcanics Quartz Veins Sulphurous Minerals Niger

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