Geology Of The Archean C T Gold Au Cu Intrusion Related Deposit Swayze Greenstone Belt Ontario
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Geology Of The Archean C T Gold Au Cu Intrusion Related Deposit Swayze Greenstone Belt Ontario
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Author : Laura Rachel Katz
language : en
Publisher:
Release Date : 2016
Geology Of The Archean C T Gold Au Cu Intrusion Related Deposit Swayze Greenstone Belt Ontario written by Laura Rachel Katz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
The Côté Gold Au(-Cu) deposit is a low-grade, large-tonnage type deposit with an indicated resource of 269 Mt averaging 0.88 g/t Au (7.61 M oz) and an inferred resource of 44 Mt averaging 0.74 g/t Au (1.04 M oz) at a cut-off grade of 0.3 g/t Au. The deposit is located in the Swayze greenstone belt (SGB), part of the larger and gold-rich Abitibi Subprovince and is the first large gold deposit to be discovered in the SGB. The deposit is hosted by multi-phase tonalite, diorite and quartz diorite intrusions of the Chester intrusive complex (CIC), a multi-phased, laccolith-shaped synvolcanic intrusion. Crosscutting relationships suggest coeval emplacement of the host rocks and high-precision UPb ID-TIMS zircon geochronology results constrain the CIC to ca. 2741 to 2739 Ma. Although a close temporal relationship exists between the tonalite and dioritic phases, they appear to be petrogenetically unrelated. The CIC is demonstrated to be petrologically, texturally and geochemically similar to low-Al tonalite-trondhjemite-diorite composite intrusions known to underlie VMS-type mineralization. The CIC was emplaced into tholeiitic mafic metavolcanic rocks of the Arbutus Formation that are interpreted to have formed in a back-arc environment. The CIC is coeval and cogenetic with the felsic to intermediate rocks of the Yeo Formation. Emplacement of the CIC into a shallow crustal level is inferred based on the incorporation of screens and inclusions of the Yeo Formation, consistent with the presence of textures, such as granophyres, miarolitic cavities and pegmatites, and Al-in hornblende geobarometry results of ≤1.3 ± 0.6 kbars. The intrusive complex is intruded by several younger and petrogenetically unrelated dike phases, as well as overprinted by regional deformation events. iv The deposit has a large ore envelope (1200 m by 300 m) within which several styles of mineralization (breccias, disseminations and veins) that are co-spatial and cogenetic to hydrothermal alteration are recognized. The hydrothermal stages consist of: (1) a rare series of gold-bearing amphibole-rich veins and breccias spatially restricted to the south and central parts of the deposit; (2) an extensive, main-stage biotite alteration that is centred on Au- and Cubearing hydrothermal biotite breccia bodies. Outwards from the breccia are veins (stockworks and sheeted arrays) and disseminations; (3) an extensive, Au ± Cu-bearing fracture-controlled and replacement-style muscovite alteration in the centre of the deposit; (4) an unmineralized fracture-controlled and disseminated epidote alteration that is localized to the north of the deposit; (5) a texturally destructive albite alteration occurs in the central part of the deposit; and (6) chlorite alteration that overprints biotite alteration. Drill core observations suggest that all the hydrothermal events, except chloritization, broadly overlap with magmatism and are crudely zoned on the deposit scale; chloritization is considered to be metamorphic in origin. To constrain the timing of hydrothermal events U-Pb ID-TIMS, SHRIMP and LA ICPMS dating of four hydrothermal titanites from amphibole and albite alteration assemblages and Re-Os dating of two molybdenite samples were analyzed. The hydrothermal titanite ages are centred on a ca. 2740 Ma and the molybdenite ages are 2736.1 ± 11.4 Ma and 2746.8 ± 11.4 Ma. These ages overlap with magmatism and strongly support a syn-intrusion timing for alteration and gold mineralization. Importantly, this age represents a new metallogenic gold event in the Abitibi Subprovince. In addition, two rutile ages at ca. 2667 Ma were obtained and indicate the deposit was affected by subsequent thermal events, such as regional metamorphism. Several of the alteration types (i.e., amphibole, biotite, muscovite and epidote) are considered to be genetically related to the dioritic phases of the CIC based on relative timing, v distribution, mineralogy and mineral chemistry and whole-rock geochemistry. The progressive crystallization of the dioritic magma chamber is considered to have resulted in the generation of mineralized magmatic-hydrothermal fluids that are thought to be responsible for generating the Côté Gold deposit. The sequence of alteration types, their zonation in the deposit and their chemistry (i.e., gains and losses, REE patterns, metal associations and isotopes) is consistent with the early hydrothermal stages (i.e., amphibole and biotite) having formed from high temperature magmatic-derived dioritic fluids and the later alteration types (i.e., muscovite and epidote) having formed from cooling magmatic fluids mixed with seawater. The development of albite alteration is thought to be the result of volatile exsolution of tonalite based on its syn-intrusion timing and the Na-rich nature of the fluids. Although albite alteration may be gold-bearing, the erratic distribution of the mineralization and the leaching capacity of fluids suggest earlier gold was remobilized during this event. Considering the characteristics of the host rocks, the demonstrated overlap of magmatic and hydrothermal events at ca. 2740 Ma, the nature and distribution of alteration, the style of the associated mineralization and the geochemical characteristics of the hydrothermal fluids the Côté Gold deposit is considered to be intrusion-related in origin and formed in a manner similar to Phanerozoic porphyry-type deposits.
Archean Lode Gold Deposits In Ontario
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Author : A. C. Colvine
language : en
Publisher:
Release Date : 1988
Archean Lode Gold Deposits In Ontario written by A. C. Colvine and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Science categories.
A Regional Structural Model For Gold Mineralization In The Southern Part Of The Archean Superior Province United States
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Author : Paul Kibler Sims
language : en
Publisher:
Release Date : 1992
A Regional Structural Model For Gold Mineralization In The Southern Part Of The Archean Superior Province United States written by Paul Kibler Sims and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Geology, Stratigraphic categories.
The Canadian segment of the Archean Superior province is a major world source of lode gold. The gold deposits occur in or near regional transcurrent and oblique slip-shear deformation zones that comprise a conjugate set to a northwest- directed compression of the Superior province. These structures provided permeable pathways for the flow of large volumes of auriferous fluid derived from an external source. Historic gold production from the United States segment of the Superior province is modest, but the close similarity in the geologic environment of the United States and Canadian segments suggests that large gold deposits should be present in the U.S.A. An occurrence model largely based on known parameters of gold mineralization in Canada suggests that the greenstone-granite terranes of the Wawa and Wabigoon sub-provinces in the United States are favorable for important gold deposits. The model suggests that gold mineralization took place during or later than the transcurrent faulting and that it took place contemporaneously with emplacement of silica-undersaturated intrusions. The faulting occurred late in the igneous-tectonic history of the Superior province, about 2,690 Ma. Extensive, intense alteration comprising carbonitization, silicification, and sulfidization accompanied the gold mineralization. The relationships between alteration minerals and mineralized veins suggest a close temporal relationship between the alteration and gold mineralization processes. The proposed occurrence model for gold mineralization and the available data suggest that two broad regions of greenstone in the Archean Superior province in north-central United States are particularly favorable for gold deposits: (1) the Upper Peninsula of Michigan, and (2) northeastern Minnesota. The Ishpeming greenstone belt of the Wawa subprovince in Michigan contains the important Ropes deposit and several other known gold occurrences, and the Vermilion district (Wawa subprovince) in northeastern Minnesota contains highly anomalous gold in soils and minor known bedrock occurrences. Transcurrent faults in both areas should be favorable sites for gold mineralization
Gold Deposits Related To Greenstone Belts In Brazil Deposit Modeling Workshop
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Author : Charles H. Thorman
language : en
Publisher:
Release Date : 1991
Gold Deposits Related To Greenstone Belts In Brazil Deposit Modeling Workshop written by Charles H. Thorman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Geology, Stratigraphic categories.
Fluid Chemical Studies Of Gold Systems
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Author : Mitchell James Kerr
language : en
Publisher:
Release Date : 2019
Fluid Chemical Studies Of Gold Systems written by Mitchell James Kerr and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Despite several decades of study, the source(s) of gold and mineralizing fluids, and the mechanisms responsible for gold precipitation remain controversial. In particular, there is a need to improve: (i) the identification of secondary gold upgrading processes that lead to very highgrade gold zones; (ii) the understanding of precipitation mechanisms in carbonaceous material (CM)-bearing metasedimentary systems (i.e., slate belts); and (iii) the exploration criteria for the cryptic, finely disseminated gold mineralization in CM-bearing metamudstone lithologies. The combined results of an extensive in situ microanalytical protocol (SEM, confocal Raman microspectroscopy, microthermometry, decrepitate mound analysis, LA-ICP-MS, cathodoluminescence, SIMS) has idenitified evidence of secondary gold enrichment at the Madrid deposit, Hope Bay Greenstone Belt, NU, Canada, resulting from the addition of new gold onto an earlier orogenic quartz-carbonate vein deposit by magmatic-hydrothermal fluids. This conclusion is based on robust textural, mineralogical, and fluid inclusion evidence. The geological setting and mineral-chemical features suggest an intrusion-related (i.e., porphyry), or intermediate-sulfidation epithermal mineralization style for the later event. This work provides another example of the importance of compositionally distinct cumulative hydrothermal events in the development of high-grade gold deposits in orogenic settings. The Dufferin deposit, NS, Canada, is a vein-type system hosted in CM-bearing metasedimentary rocks. A detailed fluid inclusion study strongly suggests that Au mineralization occurred through coupled fluid fO2 reduction (via interaction with CM) and pH increase, leading to efficient Au precipitation from an Au-undersaturated aqueous-carbonic fluid. This study presents one of the few examples of measured Au concentrations in ore fluids in an economic orogenic Au deposit and reports direct evidence for the genetic relationship between Au and CM in metasedimentary lithologies. The results of this study show that, despite mineralizing fluids being Auundersaturated, they may still produce economic deposits through highly efficient precipitation processes. The Moose Rive anticline, NS, Canada, hosts a number of, commonly inconspicuous, metasediment-hosted disseminated Au deposits. An initial study using an on-line, rock-crushing gas chromatographic technique identified bulk fluid differences (CO2 and hydrocarbon abundances) between gold-bearing and gold-barren parcels of metasedimentary rock. This work suggests that bulk fluid characteristics may be a viable exploration vector for disseminated gold systems.
Gold Mineralization At The Campbell Mine Red Lake Greenstone Belt Uchi Subprovince Ontario
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Author : Charles A. Tarnocai
language : en
Publisher:
Release Date : 2001
Gold Mineralization At The Campbell Mine Red Lake Greenstone Belt Uchi Subprovince Ontario written by Charles A. Tarnocai and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Gold categories.
Ressources M Talliques 2
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Author : Sophie Decrée
language : fr
Publisher: ISTE Group
Release Date : 2022-11-01
Ressources M Talliques 2 written by Sophie Decrée and has been published by ISTE Group this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-11-01 with Science categories.
Les ressources métalliques jouent un rôle majeur dans la transition énergétique, à la fois pour le développement de nouvelles technologies et dans la production et le stockage d’énergies vertes. Ressources métalliques 2 propose une sélection d’études de provinces métallogéniques ou de gisements remarquables en Amérique, en Afrique ou présents au niveau mondial qui permettent d’aborder la question de la concentration de métaux, notamment stratégiques, dans des contextes géodynamiques divers. La compréhension des processus géologiques qui induisent la formation des gisements et influencent leur concentration dans la croûte terrestre est de première importance pour la découverte de nouvelles ressources minérales. Cet ouvrage met en avant différentes approches méthodologiques nécessaires à l’étude des gisements des ressources métalliques, de l’observation de terrain à l’interprétation de microanalyses. Une étude de certains cadres géo-politico-économiques particuliers est également présentée.
Gold Mineralization In The Menzies Kambalda Region Eastern Goldfields Western Australia
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Author : W. K. Witt
language : en
Publisher:
Release Date : 1993
Gold Mineralization In The Menzies Kambalda Region Eastern Goldfields Western Australia written by W. K. Witt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Eastern Goldfields (W.A.) categories.
Battye accession number 015139, 015139A.
Southern Cross Greenstone Belt
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Author :
language : en
Publisher:
Release Date : 1995
Southern Cross Greenstone Belt written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Gold mines and mining categories.
Geology Structure And Gold Mineralization Kirkland Lake And Larder Lake Areas Gauthier And Teck Townships
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Author : Ontario Geological Survey
language : en
Publisher: [Sudbury] : Ontario Geological Survey
Release Date : 2005-01-01
Geology Structure And Gold Mineralization Kirkland Lake And Larder Lake Areas Gauthier And Teck Townships written by Ontario Geological Survey and has been published by [Sudbury] : Ontario Geological Survey this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-01-01 with Geology, Structural categories.