Дисертації з теми "Ore petrology"
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Weis, Franz. "Oxygen Isotope Signatures of the Apatite-Iron Oxide Ore at Grängesberg." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-173031.
Повний текст джерелаLindeberg, Tomas. "Indium Analysis and Small-scale Distribution in Sulphides from the Lindbom Prospect, Långban Area, Western Bergslagen Ore Province." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-196479.
Повний текст джерелаPacanovsky, Aaron James. "Petrology of Gold Ore-Bearing Carbonates of the Helen Zone, Cove Deposit, Lander County, Nevada." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1398682471.
Повний текст джерелаPiché, Mathieu. "Synthèse géologique et métallogenique du camp minier de Matagami, Québec /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1991. http://theses.uqac.ca.
Повний текст джерелаMagnan, Martin. "La zone 87 du gisement d'or et de cuivre du lac Troilus : pétrographie et géochimie /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1993. http://theses.uqac.ca.
Повний текст джерелаMekkaoui, Alaoui Moulay El Mustapha. "Caractérisation géochimique, pétrologique et métallogénique du gisement de sulfures massifs vocanogènes ANSIL /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1996. http://theses.uqac.ca.
Повний текст джерелаAndersson, Stefan. "Malmmikroskopering - en studie av sulfidmineral från Långbantrakten, Bergslagen, Sverige." Thesis, Uppsala universitet, Berggrundsgeologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-169481.
Повний текст джерелаThe small sulphide mines, Näset and Getberget that have been investigated are located just outside the main mineralization of Långban, near the city of Filipstad in Värmland County. Opaque minerals have been studied in reflected light microscopy and with an electron microprobe analysis to describe the mineralogy. Both areas are dominated by various (Cu-Fe-Pb-Zn)-sulphides, Näset with chalcopyrite (CuFeS2), galena (PbS) and sphalerite ((Zn,Fe)S) and Getberget with, galena, sphalerite, cubanite (CuFe2S3) and pyrrhotite (Fe1-xS). The sulphides are also accompanied by various accessory minerals, in Näset by two different phases of Co-pentlandite (on rich in nickel and one without), native Sb and Bi, a (Ni-Co)-sulphide, breithauptite (NiSb) and pyrrhotite. Cubanite is also a very important mineral that reflects the formation of the mineralization. In Getberget there are similar accessory minerals, chalcopyrite, nickel rich Co-pentlandite, native Bi and Sb, acanthite (Ag2S), breithauptite and magnetite (Fe3O4). A late precipitation of cubanite has occurred in both areas, suggesting that the mineralizations has been formed in similar conditions. This also holds true when comparing the mineralogy, which also is similar.
Blake, Kevin L. "The petrology, geochemistry and association to ore formation of the host rocks of the Kiirunavaara magnetite-apatite deposit, northern Sweden." Thesis, Cardiff University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321483.
Повний текст джерелаStalder, Marcel. "Petrology and mineral chemistry of sulphide ores and associated metalliferous rocks of the Gamsberg Zn-Pb deposit, South Africa : implications for ore genesis and mineral exploration." Thesis, Stellenbosch : University of Stellenbosch, 2004. http://hdl.handle.net/10019.1/16072.
Повний текст джерелаENGLISH ABSTRACT: The Gamsberg Zn-Pb deposit is a metamorphosed and multiply deformed sediment-hosted base metal deposit in the central Namaqua Province of South Africa. The deposit is hosted by the Bushmanland Group, a late Palaeoproterozoic (2000-1600 Ma) supracrustal succession of quartzite, metapelitic schist and interbedded metavolcanic rocks. Mineralisation occurs within the central part of the Gams Formation, a heterogeneous sequence of metamorphosed metalliferous sediments and fine-grained organic-rich shales. The ore horizon is subdivided into a lower unit of metapelite-hosted ore, an intermediate layer of phosphorite-hosted ore, and an upper unit of banded garnet-apatite ore. The ore body is enveloped by unmineralised silicate-, carbonate- and oxide-facies metalliferous rocks, which originally represented mixtures of Fe-Mn-rich hydrothermal precipitates, authigenic carbonate, and variable concentrations of detrital material. Based on mineralogical and geochemical characteristics, the metalliferous host rocks are subdivided into iron formations, coticules, Fe-Mn silicates, impure marbles and barite/Ba-rich quartzite. Minerals of the Gams Formation mostly represent solid solution between the Fe and Mn end-members of garnet, pyroxene, pyroxenoid, amphibole, olivine, spinel and ilmenite. Calcium-rich rock types are a typical feature and characterized by the occurrence of manganoan calcite, clinopyroxene, andradite-rich garnet and titanite. A successive increase in the (Mn+Ca):Fe value of rocks and minerals is evident with increasing distance from the ore horizon. Amphibole is restricted to Fe-rich ore-bearing assemblages, whereas orthopyroxene, clinopyroxene, Fe-rich pyroxenoid and olivine are present in intermediate assemblages, and Mn-rich rhodonite and pyroxmangite in the most manganiferous assemblages. These variations are mimicked by an increase in the Mn:Fe value of coexisting garnet and ilmenite group minerals with increasing distance from ore. LA-ICP-MS analyses have been used to constrain the REE patterns of garnet and apatite. In the ore-body, these minerals display a positive Eu anomaly, which is interpreted to reflect a distinct hydrothermal signature. In contrast, garnet and apatite in unmineralised metalliferous rocks display nil or a negative Eu anomaly. Primary features of the Gams Formation, such as REE patterns, the banded nature of garnet-apatite ore, the presence of diagenetic apatite nodules, and the distribution of the redox-sensitive elements Ba and Mn have been used to constrain palaeo-environmental conditions. The results indicate that metapelitehosted ore has been deposited in a stratified ocean that was characterised by anoxic bottom waters and precipitation of Fe and Zn sulphides into organic matter-rich shales. These rocks were superceded by phosphorite-hosted ore, garnet-apatite ore and metalliferous host rocks that developed in a suboxic to oxic environment. The large size of the deposit, the internal lamination of the ores and the predominance of sphalerite and barite are consistent with a vent-distal setting and precipitation of the ore-forming constituents from dense and reduced hydrothermal fluids, which originated due to reactivation of dormant growth faults. Collectively, the geological evidence indicates that Gamsberg is bridging the gap betweenthe SEDEX and BHT classifications. The relationships demonstrate that differences between these two classes of sediment-hosted Zn-Pb deposits are predominantly related to environmental conditions within localised third order basins and not to fundamental differences in ore-forming processes.
AFRIKAANSE OPSOMMING: Die Gamsberg Zn-Pb afsetting is ‘n meerfasig vervormde en gemetamorfiseerde sedimentgesetelde onedel metaal afsetting in die sentrale Namakwa Provinsie van Suid Afrika. Die afsetting word geherberg deur die Boesmanland Groep, ‘n laat Paleoproterosoïse (2000 – 1600 Ma) bokors-opeenvolging van kwartsiet, metapelitiese skis en tussengelaagde metavulkaniese gesteente. Mineralisasie word gevind in the sentrale deel van die Gams Formasie. Die Gams Formasie is ‘n heterogene opeenvolging van gemetamorfiseerde metaalhoudende sediment en fynkorrelrige organiese skalie. Die erts horison word onderverdeel in ‘n onderste laag van metapeliet-gesetelde erts, n sentrale laag van fosforiet-gesetelde erts, en ‘n boonste laag van gebande granaat-apatiet erts. Die erts-liggaam word omhuls deur ongemineraliseerde silikaat-, karbonaat- en oksied-fasies metal-ryke rotse. Hierdie gesteentes word geinterpreteer as oorspronklike mengsels van Fe-Mn-ryke hidrotermale partikels, outigeniese karbonaat, en verskeie hoeveelhede detritale materiaal. Gebaseer op mineralogiese en geochemiese kenmerke word hierdie rotse onderverdeel in ysterformasies, „coticules“, Fe-Mn silikate, onsuiwer marmer en barite/Ba-ryke kwartsiet. Minerale van die Gams Formasie form meestal soliede oplossingsreekse tussen die Fe en Mn endlede van granaat, pirokseen, piroksenoid, amfibool, olivien, spinel en ilmeniet. Kalsium-ryke rots tipes is ‘n tipiese kenmerk van die Gams Formasie en word gekenmerk deur mangaan-ryke kalsiet, klinopirokseen, andradiet-ryke granaat en sfeen. Daar word ‘n stapsgewyse vergroting van die (Mn+Ca):Fe verhouding in gesteentes en minerale gevind met toeneemende afstand van die erts horison. Amfibool is beperk tot Fe-ryke ertsdraende gesteentes, ortopirokseen, klinopirokseen, Fe-ryke piroksenoid en olivien tot intermediêre gesteentes, en Mn-ryke rodoniet en piroksmangiet tot Mn-ryke gesteentes. Hierdie variasies gaan gepaard met vergroting van die Mn:Fe verhouding in granaat en ilmeniet-groep minerale met toeneemende afstand van die erts. LA-ICP-MS analises was gebruik om die skaars-aarde element patrone van granaat en apatiet te bepaal. In die erts-liggaam wys hierdie minerale ‘n positiewe Eu anomalie, wat geinterpreteerd word as ‘n hidrotermale kenmerk. In ongemineraliseerde gasheer gesteentes wys granaat en apatiet geen of ‘n negatiewe Eu anomalie. Primêre kenmerke van die Gams Formasie, soos skaars-aarde patrone, the gebande voorkoms van granaat-apatiet erts, die teenwoordigheid van diagenetiese apatiet knolle, en die verspreiding van die redox-sensitiewe elemente Ba en Mn, was gebruik om afleidings oor die paleo-omgewing te maak. Die resultate het gewys dat metapeliet-gesetelde erts afgeset was onder anoksiese bodem water deur presipitasie van Fe en Zn sulfiedes in organiese skalie. Hierdie erts gaan oor in fosforiet-gesetelde erts, granaat-apatiet erts en metaal-ryke gasheer gesteente wat in ‘n suboksiese tot oksiese omgewing ontstaan het. Die grootte van die afsetting, die interne gelaagdheid van die erts, asook die teenwoordigheid van sfaleriet en bariet dui op ‘n distale omgewing relatief tot die hidrotermale bron en presipitasie van die ertsuit digte en gereduseerde hidrotermale vloeistowwe, wat ontstaan het deur die heraktiveering van rustende groeiverskuiwings. Gesaamentlik bewys die geologiese kenmerke van Gamsberg dat gemetamorfiseerde SEDEX en Broken Hill-tipe mineralisasie binne die perke van ‘n enkele afsetting kan voorkom. Die geologiese verhoudings dui aan dat verskille tussen hierdie twee tipes van sedimentgesetelde afsettings meestal veroorsaak word deur omgewings-toestande binne in gelokaliseerde derde orde komme en nie deur fundamentele verskille in ertsvormende prosesse nie.
Boucher, Stéphanie. "Ore Petrology and Alteration of the West Ansil Volcanic-hosted Massive Sulphide Deposit of the Noranda Mining Camp, Rouyn-Noranda, Quebec." Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19786.
Повний текст джерелаJohn, Kangeze Biteme. "Ore forming potential of the Atchiza Suite and Sustainable management of mineral deposits in Mozambique : "Petrology, geochemistry and sustainable management of mineral deposits"." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for geologi og bergteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-20380.
Повний текст джерелаGreen, Bradley. "A study of the Wilkins and Green and Gold Copper-gold prospects, Olary Block, South Australia with emphasis on petrology, geochemistry and ore mineralogy /." Title page, contents and abstracts only, 1996. http://web4.library.adelaide.edu.au/theses/09SB/09sbg811.pdf.
Повний текст джерелаAustralian National Grid Reference (SI 54-2) 1:250 000. Four folded maps in pocket pasted onto back cover. Includes bibliographical references (leaves 62-68).
Michaud, Michael Julien. "The geology, petrology, geochemistry and platinum-group element-gold-copper-nickel ore assemblage of the Roby Zone, Lac des Iles mafic-ultramafic Complex, northwestern Ontario." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0027/MQ52068.pdf.
Повний текст джерелаPolteau, Stéphane. "The early proterozoic Makganyene glacial event in South Africa : its implication in sequence stratigraphy interpretations, paleoenvironmental conditions and iron and manganese ore deposition." Thesis, Rhodes University, 2005. http://hdl.handle.net/10962/d1007612.
Повний текст джерелаFerraina, Clément. "Partage des métaux entre liquide sulfuré et liquide silicaté : Expérimentation, modélisation et applications aux gisements de sulfures magmatiques." Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2004/document.
Повний текст джерелаA comprehensive knowledge of metal partitioning between sulfide liquid and silicate melt is essential tounderstand sulfide liquid enrichment in chalcophile and siderophile elements that can lead to theformation of magmatic sulfide ore deposits.The first aim of this thesis was to quantify the partition coefficients (Dsul/sil) for Co, Ni, Cu, Pd, Ag, Pt andAu at crustal conditions relevant to the Noril’sk-Talnakh region (Russia), through an experimental studyconducted in internal heated pressure vessels at 1200 °C, 70 MPa, and under variable oxygenfugacities.Our results show that Dsul/sil for Pd, Ag, Pt and Au increase with the content of the element in the sulfideliquid, showing that they do not follow Henry’s law, in contrast to those for Co, Ni, and Cu. These Dsul/silcan reproduce the metal contents of natural sulfides of the Noril’sk region, starting from a parent magmaPd- and Pt-richer than the lavas of the region, and invoking an interaction between the masses of silicateliquid and sulfide liquid in order to enrich the latter.The second objective of this thesis was to model Dsul/sil variations as a function of magmatic conditions,using a thermodynamic approach. This modeling allows investigating the variations of Dsul/sil withtemperature, pressure, oxygen fugacity and the compositions of both liquids and suggests that the maficmagmas with the lowest temperatures and pressures and the highest oxygen fugacities are those inequilibrium with the most enriched sulfide liquid
Taylor, Mackenzie C. "GOLD FROM THE TYPE 4 ORE OF ROUND MOUNTAIN, NEVADA: A TEXTURAL AND MINERALOGICAL STUDY OF MACROCRYSTALLINE GOLD VS. DISSEMINATED GOLD." Miami University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=miami1512407677037903.
Повний текст джерелаPazeto, Abiliane de Andrade [UNESP]. "Correlação entre propriedades petrográficas e comportamento tecnológico e de alterabilidade das rochas ornamentais silicáticas Diamante Negro (BA), Ocre Itabira e Banco Galaxy (ES)." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/92883.
Повний текст джерелаConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
O objetivo da presente pesquisa foi estabelecer a correlação entre as propriedades petrográficas e o comportamento tecnológico e de alterabilidade de três materiais utilizados como rochas ornamentais e para revestimento. Os tipos petrográficos correspondem a um microgabro (Diamante Negro), um hornblenda sienito pórfiro com quartzo (Ocre Itabira) e um granito pegmatóide com granada e sillimanita (Branco Galaxy), sendo o primeiro proveniente do estado da Bahia e os dois últimos do estado do Espírito Santo. Os materiais foram caracterizados petrograficamente e submetidos a uma bateria de ensaios físico-mecânicos e de alteração acelerada que compreenderam determinações de índices físicos, desgaste abrasivo Amsler, compressão uniaxial simples, resistência à flexão 3 e 4 pontos, impacto de corpo duro, velocidade de propagação de ondas ultrassônicas longitudinais, coeficiente de dilatação térmica linear e resistência ao ataque químico sob efeito de compostos agressivos e em câmaras saturadas em atmosfera salina e dióxido de enxofre (SO2). Os resultados demonstram que o comportamento tecnológico das rochas está intrinsecamente relacionado aos aspectos mineralógicos, estruturais e texturais inerentes a cada tipo petrográfico. O Diamante Negro é o material detentor dos maiores índices físico-mecânicos, uma vez que suas características petrográficas são marcadas por granulação fina, bom entrelaçamento mineral, e baixo grau de microfissuramento. Quanto à alteração acelerada, no entanto, apresentou variações cromáticas consideráveis, dado seu elevado teor de minerais máficos. O tipo comercial Ocre Itabira também apresentou boas propriedades tecnológicas, com valores inferiores ao Diamante Negro devido principalmente à sua granulação...
The objective of this research was correlating petrographical properties to the technological and alterability behavior of three materials used as ornamental and building stones. The samples correspond to a microgabbro (Diamante Negro), a hornblende porphiral syenite with quartz and (Ocre Itabira) a pegmatoid granite with garnet and sillimanite (Branco Galaxy), being the first sample originating from the Bahia state and the last one from Espírito Santo state. The materials were petrographically analyzed and submitted to physical mechanics tests and chemical alterability including measurements of physical indexes, abrasion resistance, compressive strength, modulus of rupture, flexural strength, impact strength, ultrasonic pulse velocity, linear thermal expansion coefficient and resistance to the chemical attack accomplished by aggressive compositions and chambers which simulate both sea-salt and sulphur dioxide weathering. The results reveal the influence of minerals, textural and structural features over the studied stones behavior during the performed tests. Diamante Negro is the material which showed the highest physical-mechanics properties, once their petrographical parameters correspond to fine grain size, good mineral interlacement, and low microcrack degree. However, relating to the chemical alterability it showed considerable chromatic deterioration, given its high content of mafic minerals. The commercial type Ocre Itabira also presented good technological properties, with inferior values than Diamante Negro due to its large grain size granulation and high degree of relative microcracking. The brownish coloration of potash feldspars porphyries present in its mineralogical composition turned the effects caused by the chemical reagents less evident. In general, Branco Galaxy presented the smallest values of... (Complete abstract click electronic access below)
Pazeto, Abiliane de Andrade. "Correlação entre propriedades petrográficas e comportamento tecnológico e de alterabilidade das rochas ornamentais silicáticas Diamante Negro (BA), Ocre Itabira e Banco Galaxy (ES) /." Rio Claro : [s.n.], 2011. http://hdl.handle.net/11449/92883.
Повний текст джерелаBanca: Tamar Milca Bortolozzo Galembeck
Banca: Fabiano Cabañas Navarro
Resumo: O objetivo da presente pesquisa foi estabelecer a correlação entre as propriedades petrográficas e o comportamento tecnológico e de alterabilidade de três materiais utilizados como rochas ornamentais e para revestimento. Os tipos petrográficos correspondem a um microgabro (Diamante Negro), um hornblenda sienito pórfiro com quartzo (Ocre Itabira) e um granito pegmatóide com granada e sillimanita (Branco Galaxy), sendo o primeiro proveniente do estado da Bahia e os dois últimos do estado do Espírito Santo. Os materiais foram caracterizados petrograficamente e submetidos a uma bateria de ensaios físico-mecânicos e de alteração acelerada que compreenderam determinações de índices físicos, desgaste abrasivo Amsler, compressão uniaxial simples, resistência à flexão 3 e 4 pontos, impacto de corpo duro, velocidade de propagação de ondas ultrassônicas longitudinais, coeficiente de dilatação térmica linear e resistência ao ataque químico sob efeito de compostos agressivos e em câmaras saturadas em atmosfera salina e dióxido de enxofre (SO2). Os resultados demonstram que o comportamento tecnológico das rochas está intrinsecamente relacionado aos aspectos mineralógicos, estruturais e texturais inerentes a cada tipo petrográfico. O Diamante Negro é o material detentor dos maiores índices físico-mecânicos, uma vez que suas características petrográficas são marcadas por granulação fina, bom entrelaçamento mineral, e baixo grau de microfissuramento. Quanto à alteração acelerada, no entanto, apresentou variações cromáticas consideráveis, dado seu elevado teor de minerais máficos. O tipo comercial Ocre Itabira também apresentou boas propriedades tecnológicas, com valores inferiores ao Diamante Negro devido principalmente à sua granulação... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The objective of this research was correlating petrographical properties to the technological and alterability behavior of three materials used as ornamental and building stones. The samples correspond to a microgabbro (Diamante Negro), a hornblende porphiral syenite with quartz and (Ocre Itabira) a pegmatoid granite with garnet and sillimanite (Branco Galaxy), being the first sample originating from the Bahia state and the last one from Espírito Santo state. The materials were petrographically analyzed and submitted to physical mechanics tests and chemical alterability including measurements of physical indexes, abrasion resistance, compressive strength, modulus of rupture, flexural strength, impact strength, ultrasonic pulse velocity, linear thermal expansion coefficient and resistance to the chemical attack accomplished by aggressive compositions and chambers which simulate both sea-salt and sulphur dioxide weathering. The results reveal the influence of minerals, textural and structural features over the studied stones behavior during the performed tests. Diamante Negro is the material which showed the highest physical-mechanics properties, once their petrographical parameters correspond to fine grain size, good mineral interlacement, and low microcrack degree. However, relating to the chemical alterability it showed considerable chromatic deterioration, given its high content of mafic minerals. The commercial type Ocre Itabira also presented good technological properties, with inferior values than Diamante Negro due to its large grain size granulation and high degree of relative microcracking. The brownish coloration of potash feldspars porphyries present in its mineralogical composition turned the effects caused by the chemical reagents less evident. In general, Branco Galaxy presented the smallest values of... (Complete abstract click electronic access below)
Mestre
Giacomeli, Henrique [UNESP]. "As formações ferríferas bandadas de Piumhi: geologia, petrografia e caracterização tecnológica." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/92927.
Повний текст джерелаAs formações ferríferas bandadas de Piumhi pertencem ao Grupo Lavapés, definido como uma seqüência metassedimentar alóctone do tipo melange tectônica de idade mínima de 634 +/-07. Essas formações ferríferas afloram ao longo da serra do Lavapés, interdigitadas em sucessão de metaconglomerados poli- a oligomíticos, metagrauvacas finas e quartzo-muscovita xistos, que pertencem a Unidade Conglomerática, e, de forma mais contínua, no contato desta unidade com a sobrejacente, a qual é composta por sericita quartzito, definida neste trabalho como Unidade Quartzítica. Dados obtidos no presente trabalho mostram que a deposição dessas formações ferríferas se iniciou num ambiente sedimentar de alta energia, do tipo continental a transicional gradando para bacia marinha restrita, dentro da qual ocorreram pulsos de sedimentação progradante, sucedida de retrograndante e, posteriormente, nova sequência progradante. Nas formações ferríferas estudadas os minerais opacos são representados essencialmente por hematita do tipo granular e especular, magnetita e martita, que ocorrem em bandas de espessura submilimétrica a centimétrica intercaladas com bandas de quartzo recristalizado; muscovita e filossilicatos finos ocorrem subordinadamente. Apresentam foliação milonítica e estão metamorfisadas em fácies xisto verde, sendo que a martitização de algumas amostras, em estágio avançado de transformação mineralógica, revela a presença de fluidos metamórficos tardios de natureza oxidante. Critérios mineralógicos e texturais permitiram definir três tipos de minério: semi-friável, compacto e maciço. Os cristais de especularita e magnetita/martita ocorrem numa faixa granulométrica de 5 a 450μm, com predomínio de cristais com tamanho médio de 40μm, que muitas vezes estão interpenetrados...
The banded iron formations of the Piumhi belongs to the Lavapés Group, defined by a sequence of metasedimentary allochthonous tectonic mélange yielding a minimum age 634 + / -07. These iron formations outcrop around of the Lavapés Montain, interlayered in succession in the metaconglomerates poly- to oligomíticos, metagraywacke, quartz-muscovite schists, and more continuously in contact with the overlying unit, which is composed of the sericite quartzite, defined Unit quartzite. Data obtained in this study show that the deposition iron formations started from sedimentary high energy environment like transitional continental to restricted marine basin, which occurred within the progradational pulses of the sedimentation, followed by retrogranding and then new sequence prograding. The opaque minerals of the Piumhi Banded Iron Formations are mainly represented by hematite and specular-type granules, magnetite and martite, which occur in bands interlayed by submillimeter to centimeter beds of the recrystallized quartz, muscovite and subordinate phyllosilicates occur fine. Exhibit mylonitic foliation and are metamorphosed into greenschist facies, and the martitization some samples, in advanced stages of mineralogical transformation, reveals the presence of metamorphic fluids late in the oxidizing nature. Mineralogical and textural criteria allowed to define three ores types: semi-friable, compact and massive The crystals of magnetite and specularite / martite occur at grain size range from 5 to 450μm, with a predominance of crystals with size average of 40μm, which often are interpenetrated with quartz. Given these peculiarities, the tests of processing such as grinding, sieving and magnetic separation show that the types and semi-friable compact exhibit similar behavior. Since the procedures used in... (Complete abstract click electronic access below)
Saad, Allan Emile. "A petrological study of the tin-tungsten deposit at Renosterkop, Augrabies, Northern Cape Province / by Allan Emile Saad." Thesis, Potchefstroom University for Christian Higher Education, 1987. http://hdl.handle.net/10394/606.
Повний текст джерелаThesis (MSc)--PU vir CHO, 1987.
Giacomeli, Henrique. "As formações ferríferas bandadas de Piumhi : geologia, petrografia e caracterização tecnológica /." Rio Claro : [s.n.], 2011. http://hdl.handle.net/11449/92927.
Повний текст джерелаOrientador: Antenor Zanardo
Banca: Afonso Schrank
Banca: Sebastião Gomes de Carvalho
Resumo: As formações ferríferas bandadas de Piumhi pertencem ao Grupo Lavapés, definido como uma seqüência metassedimentar alóctone do tipo melange tectônica de idade mínima de 634 +/-07. Essas formações ferríferas afloram ao longo da serra do Lavapés, interdigitadas em sucessão de metaconglomerados poli- a oligomíticos, metagrauvacas finas e quartzo-muscovita xistos, que pertencem a Unidade Conglomerática, e, de forma mais contínua, no contato desta unidade com a sobrejacente, a qual é composta por sericita quartzito, definida neste trabalho como Unidade Quartzítica. Dados obtidos no presente trabalho mostram que a deposição dessas formações ferríferas se iniciou num ambiente sedimentar de alta energia, do tipo continental a transicional gradando para bacia marinha restrita, dentro da qual ocorreram pulsos de sedimentação progradante, sucedida de retrograndante e, posteriormente, nova sequência progradante. Nas formações ferríferas estudadas os minerais opacos são representados essencialmente por hematita do tipo granular e especular, magnetita e martita, que ocorrem em bandas de espessura submilimétrica a centimétrica intercaladas com bandas de quartzo recristalizado; muscovita e filossilicatos finos ocorrem subordinadamente. Apresentam foliação milonítica e estão metamorfisadas em fácies xisto verde, sendo que a martitização de algumas amostras, em estágio avançado de transformação mineralógica, revela a presença de fluidos metamórficos tardios de natureza oxidante. Critérios mineralógicos e texturais permitiram definir três tipos de minério: semi-friável, compacto e maciço. Os cristais de especularita e magnetita/martita ocorrem numa faixa granulométrica de 5 a 450μm, com predomínio de cristais com tamanho médio de 40μm, que muitas vezes estão interpenetrados... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The banded iron formations of the Piumhi belongs to the Lavapés Group, defined by a sequence of metasedimentary allochthonous tectonic mélange yielding a minimum age 634 + / -07. These iron formations outcrop around of the Lavapés Montain, interlayered in succession in the metaconglomerates poly- to oligomíticos, metagraywacke, quartz-muscovite schists, and more continuously in contact with the overlying unit, which is composed of the sericite quartzite, defined Unit quartzite. Data obtained in this study show that the deposition iron formations started from sedimentary high energy environment like transitional continental to restricted marine basin, which occurred within the progradational pulses of the sedimentation, followed by retrogranding and then new sequence prograding. The opaque minerals of the Piumhi Banded Iron Formations are mainly represented by hematite and specular-type granules, magnetite and martite, which occur in bands interlayed by submillimeter to centimeter beds of the recrystallized quartz, muscovite and subordinate phyllosilicates occur fine. Exhibit mylonitic foliation and are metamorphosed into greenschist facies, and the martitization some samples, in advanced stages of mineralogical transformation, reveals the presence of metamorphic fluids late in the oxidizing nature. Mineralogical and textural criteria allowed to define three ores types: semi-friable, compact and massive The crystals of magnetite and specularite / martite occur at grain size range from 5 to 450μm, with a predominance of crystals with size average of 40μm, which often are interpenetrated with quartz. Given these peculiarities, the tests of processing such as grinding, sieving and magnetic separation show that the types and semi-friable compact exhibit similar behavior. Since the procedures used in... (Complete abstract click electronic access below)
Mestre
Phillips, David. "Mineralogy and petrology of the Townlands iron-rich ultramafic pegmatite." Thesis, Rhodes University, 1985. http://hdl.handle.net/10962/d1007617.
Повний текст джерелаKMBT_363
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Jourdain, Vincent. "Géologie des amas sulfures aurifères de la province de Grenville /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1993. http://theses.uqac.ca.
Повний текст джерелаProgramme offert à l'Université du Québec à Montréal en vertu d'un protocole d'entente avec l'Université du Québec à Chicoutimi. CaQCU Document électronique également accessible en format PDF. CaQCU
Fredette, Julie. "Pétrographie, géochimie et potentiel économique en Fe-Ti-P du secteur du Lac à Paul, partie nord de la suite anorthositique de Lac-Saint-Jean, province de Grenville, Québec /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2006. http://theses.uqac.ca.
Повний текст джерелаLa p. de t. porte en outre: Mémoire présenté à l'Université du Québec à Chicoutimi comme exigence partielle de la maîtrise en sciences de la terre. CaQCU Bibliogr.: f. 274-294. Document électronique également accessible en format PDF. CaQCU
Manyeruke, Tawanda Darlington. "The petrography and geochemistry of the Platreef on the farm Townlands near Potgietersrus, northern Bushveld Complex." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-04282005-110052/.
Повний текст джерелаLauzière, Kathleen. "Environnement géologique et minéralisation aurifère à la mine Bachelor, Desmaraisville, Québec /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1989. http://theses.uqac.ca.
Повний текст джерелаBandyayera, Daniel. "Formation des latérites nickélifères et mode de distribution des éléments du groupe du platine dans les profils latéritiques du complexe de Musongati, Burundi /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1997. http://theses.uqac.ca.
Повний текст джерелаWasilewski, Benjamin. "Geochronology, Petrogenesis and Crustal Evolution of the Saglek-Hebron Complex (Northern Labrador): Over One Billion Years of Archean Geological History." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39617.
Повний текст джерелаDubé, Benoît. "Métallogénie aurifère du filon-couche de Bourbeau : région de Chibougamau, Quebec /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1990. http://theses.uqac.ca.
Повний текст джерелаChampagne, Patrick. "Géochimie de l'indice aurifère Erratix, Chibougamau /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1989. http://theses.uqac.ca.
Повний текст джерелаChaker, Mohammed. "Géochimie et métallogénie de la mine d'or de Tiouit, anti-atlas oriental, sud du Maroc /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1997. http://theses.uqac.ca.
Повний текст джерелаMercier-Langevin, Patrick. "Les minéralisations aurifères au sein de la tonalite de La Grande-Sud, Baie-James, Québec /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2000. http://theses.uqac.ca.
Повний текст джерелаTremblay, Christian. "Les éléments du groupe du Platine dans le dyke de Méquillon ceinture de Cape-Smith, Nouveau-Québec /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1990. http://theses.uqac.ca.
Повний текст джерелаCôté, Carol. "La distribution de l'or à la mine Montauban /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1989. http://theses.uqac.ca.
Повний текст джерелаPrud'homme, Nathalie. "Caractérisation pétrographique et géochimique de la carbonatite et de la syénite de la mine Lac Shortt /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1990. http://theses.uqac.ca.
Повний текст джерела"Mémoire présenté à l'Université du Québec à Chicoutimi comme exigence partielle de la maîtrise en sciences de la terre" CaQCU Document électronique également accessible en format PDF. CaQCU
Terracin, Matthew Theodore. "Petrography, geochemistry and origin of atypical sedimentary-igneous contact relationships at the base of the Hotazel Formation around Middelplaats, Northern Cape Province, RSA." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1012985.
Повний текст джерелаZhou, Yongzhang. "Géochimie et mécanisme métallogénique du district aurifère de Hetai, sud de la Chine = Geochimistry and metallogenetic mechanism of the Hetai gold field, southern China /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1992. http://theses.uqac.ca.
Повний текст джерелаThese présentée en collaboration de l'Université du Québec à Chicoutimi et Institute of geochemistry, Academia Sinica. CaQCU Document électronique également accessible en format PDF. CaQCU
Manyeruke, Tawanda Darlington. "Compositional and lithological variation of the Platreef on the farm Nonnenwerth, northern lobe of the Bushveld Complex implications for the origin of platinum-group elements (PGE) mineralization /." Thesis, Pretoria : [s.n.], 2008. http://upetd.up.ac.za/thesis/available/etd-01192009-164657/.
Повний текст джерелаGeorgiou, Elena. "Geologie, petrologie et petrochimie du complexe plutonique de la foret d'akapnou, chypre, et des gites de chromite associes." Orléans, 1987. http://www.theses.fr/1987ORLE2033.
Повний текст джерелаFairey, Brenton John. "Genesis of karst-hosted manganese ores of the Postmasburg Manganese Field, South Africa with emphasis on evidence for hydrothermal processes." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1020904.
Повний текст джерелаIrcañaupa, Acevedo Yber Juan. "Comportamiento de la mineralización de oro en el batolito de la costa, en la super unidad Santa Rosa, Chosica-Lima." Master's thesis, Universidad Nacional Mayor de San Marcos, 2017. https://hdl.handle.net/20.500.12672/7109.
Повний текст джерелаTesis
Healy, Raymond E. "Ore petrology and applied mineralogy of the Trout Lake massive sulfide deposit, Flin Flon, Manitoba." 1991. http://hdl.handle.net/1993/7212.
Повний текст джерелаSung, Yoo Hyun. "The Nature of Gold Mineralization in the Multistage Archean Sunrise Dam Gold Deposit, Eastern Yilgarn Craton, Western Australia." 2008. http://arrow.unisa.edu.au/vital/access/manager/Repository/unisa:36670.
Повний текст джерелаDoucette, John. "A petrochemical study of the Mount Fubilan Intrusion and associated ore bodies, Papua New Guinea." Thesis, 2000. http://hdl.handle.net/1957/33496.
Повний текст джерелаGraduation date: 2000
"Geochemistry and mineralogy of supergene altered manganese ore below the Kalahari unconformity in the Kalahari manganese field, Northern Cape Province, South Africa." Thesis, 2009. http://hdl.handle.net/10210/1958.
Повний текст джерелаIt is the focus of the study to qualitatively describe and then quantify the mineralogical and geochemical changes associated with the supergene alteration of carbonate-rich braunite lutite (Mamatwan-type ore) immediately below the Kalahari unconformity along the southeastern suboutcrop perimeter of the Hotazel Formation in the Kalahari deposit. It was also the objective of this study to determine the timing and duration of supergene alteration. Samples for polished thin sections were carefully selected from eight representative boreholes to be representative of all the lithostratigraphic zones and ore types. The thin sections were used to study mineralogy by means of reflected light microscopy and scanning electron microscopy. X-ray powder diffractometry on representative powder samples were used to study the mineralogy and geochemistry of the samples. Microprobe analyses were also performed on the representative samples. Finally the samples were submitted for 40Ar/39Ar geochronology. In this supergene enrichment zone carbonates are leached (associated with an increase in porosity) and Mn2+/Mn3+ -bearing minerals (kutnahorite, Mn-calcite an braunite) are altered to supergene Mn4+-bearing mineral phases (todorokite and manganomelane) and minor quartz. This process upgrades ore from 38 wt% Mn to ore with more than 40 wt% Mn. Element fluxes, enrichment and depletion of major and trace elements were quantified by mass balance calculations. Na2O, K2O, Sr, Ba, Zn and H2O were enriched, while Mn3O4, Fe2O3, CaO, MgO, P, B and CO2 were leached from the ore during supergene alteration. Results of this study suggest that the development of Post African I erosional surface may have taken place 45 Ma ago. The bottom of the weathering profile gives a well-defined peak at ca. 5 Ma that may possible coincide with the development of Post African II erosional surface. The major characteristics of the alteration process of the unaltered Mamatwan-type ore to supergene altered braunite lutite can be summarized as follow: • Leaching of Mn carbonates and Mn2+/Mn3+-oxides. • Formation of Mn4+-oxyhydroxides and quartz. • Decrease in relative density of the ore. • Increase in porosity of the ore. • Leaching of Mn3O4, Fe2O3, CaO, MgO, P, B, CO2. • Enrichment of Na2O, K2O, Sr, Ba, Zn, H2O. Chemical weathering processes along the Cenozoic Kalahari unconformity appear to have affected the manganiferous lithologies of the Hotazel Formation from 45 Ma onwards to 5 Ma. The weathering front processes very slowly through the Mn-rich braunite lutite (<10m in 40 Ma; <0.25m/Ma); producing a very uniform and microcrystalline supergene mineral assemblage with distinct characteristics.
Preston, Paula Cristina Canastra Ramos. "Physical and chemical characterization of the manganese ore bed at the Mamatwan mine, Kalahari manganese field." Thesis, 2009. http://hdl.handle.net/10210/1967.
Повний текст джерелаThe Mamatwan mine is situated at the most southern end of the world’s largest landbased resource of manganese, the Kalahari manganese field. The mine is operated by South African Manganese Corporation Limited (SAMANCOR) and is the largest open pit manganese mine in the world. The sedimentary manganese ore bed is interbedded with iron-formation of the Hotazel Formation of the Early Paleoproterozoic Voëlwater Subgroup of the Transvaal Supergroup. The open pit Mamatwan mine has a proven economic ore reserve of between 300 and 400Mt and produces 1.2Mt of manganese ore annually, of which 0.5Mt of ore is beneficiated and shipped through the harbour at Port Elizabeth. The remaining ore is railed to ferro-alloy plants at Meyerton and Newcastle. Carbonate-rich manganese lutite mined at the Mamatwan Mine is widely known as Mamatwan-type ore. It has a manganese content ranging from 30 – 38%. Only a small portion (15m of a total thickness of 49m) of the ore bed, containing an average of 38% Mn, is being mined and processed at present. The larger portion of the ore bed is not utilized. This study focuses on the physical and chemical characteristics of the ore bed in more detail in order to make suggestions on how to a) reduce waste by upgrading the upper parts of the lower manganese ore bed, or b) to improve the current recovery from the present economic zone. A second part of this study pays special attention to the lithostratigraphy of the lower manganese ore bed. The focus is on the paragenetic sequence and the diagenetic evolution of the braunite lutite that constitutes the manganese ore. The Mamatwan-type ore can be described as diagenetic to very low-grade metamorphic carbonate-bearing braunite manganolutite. Based on geochemical and mineralogical data, the lower manganese ore body was previously subdivided into eleven lithogically distinct zones. Based on detailed diamond drill core logging and with the aid of geochemical and physical data of two selected drill cores, an additional thirteen subzones were identified in this study. These new subzones were found to be consistent across the entire study area, located to the west and north of the present Mamatwan open pit. The paragenetic sequence recognised in the ore of the lower manganese ore bed can be subdivided into four stages, namely: (a) sedimentation, which is represented by fine lamination and the presence of fine-grained “dusty hematite”. (b) early diagenesis as represented by micritic carbonate matrix and possibly braunite, (c) late diagenesis or low-grade metamorphism are represented by coarse grained hausmannite, specularitic hematite, partridgeite and Mn-calcite, and supergene alteration that occurs immdediately below the contact of the ore bed to the unconformably overlying Tertiary Kalahari Formation. This supergene altered zone is marked by the presence of Mn4+ oxides such as cryptomelane, manjiroite, romanechite and pyrolusite, in addition to barite. The results obtained in this study permit definition of two sedimentary cycles within the manganese ore bed at the Mamatwan mine. Both cycles are defined by a carbonate-rich finely laminated zone at the base, overlain by a central manganese-rich economic zone, capped by manganese lutite that is enriched in carbonate ovoids. The two manganeserich zones are known as the M (lower) and X (upper) zone, and are characterized by the replacement of carbonate ovoids by hausmannite. The two Mn-rich zones are chemically and physically almost identical, with the M zone 7.5m thick and the X zone 5.5m thick. However, in the present mining configuration only the M zone is being mined. The most important result arising from the present study is the recommendation to restructure the future mining operation in order to mine not only the M zone, but also the X zone.
Pickett, Jacob Wayne. "A geological and geochemical study of the Skidder basalt and Skidder trondhjemites : and the geology, ore petrology and geochemistry of the Skidder Prospect and its accompanying alteration zone, Buchans area, central Newfoundland /." 1988. http://collections.mun.ca/u?/theses,117885.
Повний текст джерела(9673769), William E. Odom III. "Dating the Cenozoic incision history of the Tennessee and Shenandoah Rivers with cosmogenic nuclides and 40Ar/39Ar in manganese oxides." Thesis, 2020.
Знайти повний текст джерелаSmith, Albertus Johannes Basson. "The Paleo-environmental significance of the iron-formations and iron-rich mudstones of the Mesoarchean Witwatersrand-Mozaan Basin, South Africa." Thesis, 2009. http://hdl.handle.net/10210/2440.
Повний текст джерелаThe Mesoarchean Witwatersrand and Pongola Supergroups of South Africa are the oldest, well preserved supracratonic successions worldwide. Various banded iron formation (BIF) and iron-rich mudstone units occur within the West Rand Group of the Witwatersrand Supergroup and the Mozaan Group of the Pongola Supergroup. A granular iron formation (GIF) occurs in a single unit in the Nconga Formation of the Mozaan Group. The Witwatersrand Supergroup and Mozaan Group have been lithostratigraphically correlated and are interpreted to have been part of the same sedimentary basin. The studied BIF units occur in two associations: shale-associated and diamictiteassociated BIF. The GIF seem to have been deposited in shallower environments with greater hydrodynamic activity. The iron-rich mudstone shows a similar stratigraphic setting to that of the shale-associated BIF. The lithostratigraphic setting of the Witwatersrand-Mozaan basin BIFs are similar to what is seen for Superior-type ironformations, with the mudstones and associated BIFs marking marine transgressions. Various mineralogical facies of BIF were identified, including oxide, carbonate and silicate facies BIF, as well as mixed facies between these end members. The GIF is a unique facies and shows abundant petrographic evidence for biological activity. The iron-rich mudstone has been subdivided into iron-silicate rich, magnetite-bearing, carbonate-bearing, magnetite-carbonate-bearing and garnet-bearing subtypes. BIF, GIF and iron-rich mudstone have been subjected to lower greenschist facies metamorphism with some occurences of localized contact metamorphism. The abundance of magnetite shows that oxidation played an important part in BIF deposition, whereas the occurrence of 12C-enriched iron-rich carbonates suggests post depositional reduction of the deposited oxidized iron-rich minerals by organic matter. Al-bearing minerals are rare in the BIFs xxi and abundant in the iron-rich mudstones. Apatite and rare earth element (REE)- phosphates occur throughout. The major element geochemistry shows an inverse proportionality for Fe and Si in all the studied samples. BIFs show slightly higher Fe- and lower Si- and Al-concentrations compared to iron-rich mudstones which show higher Si- and Al- and lower Feconcentrations. The studied BIFs show major element geochemical attributes intermediate to those of Superior- and Algoma-type iron-formations. Provenance studies on some of the iron-rich mudstones illustrate that they were sourced from a mixture of mafic and felsic sources. The rare earth element (REE) geochemistry suggests strong hydrothermal input into the units, and positive correlation with the Fe-concentrations suggests that the Fe was introduced by high temperature hydrothermal fluids. The majority of the REEs are hosted by apatite and the REE-phosphates monazite and xenotime. The REEs were reconcentrated into these phosphates during diagenesis. A comparison of the studied lithostratigraphically correlatable units between the Witwatersrand Supergroup and Mozaan Group makes it possible to construct a depositional model for basin-wide BIF deposition in the Witwatersrand-Mozaan basin. Shale-associated BIF was deposited during the peak of transgression when reduced Ferich hydrothermal bottom waters were introduced into shallow ocean water that was either oxygenated or filled with anoxygenic phototrophic bacteria. Diamictite-associated BIF, in contrast, was deposited during interglacial periods when the melting of glacial ice introduced sunlight, nutrients and oxygen to the reduced, hydrothermally influenced Ferich ocean water. GIF was probably deposited in shallow, above wave base waters cut off from clastic input, and then washed into deeper depositional environments. Iron-rich mudstone was deposited in a similar setting as the shale-associated BIF, but in environments that were not completely cut off from detrital influx. The study shows that it is impossible to construct a general depositional model for Precambrian BIFs, since the lithostratigraphic and depositional settings vary between different examples of BIF.
Fitzhenry, Clifford. "The mineralogy, petrology and PGE geochemistry of the UG2 cyclic unit at Lebowa Platinum mine (ATOK), North-Eastern Bushveld complex." Thesis, 2008. http://hdl.handle.net/10413/1046.
Повний текст джерела