Late Archean Rock Types And Controls On Gold Mineralization In The Southern Abitibi Greenstone Belt Of Ontario
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Late Archean Rock Types And Controls On Gold Mineralization In The Southern Abitibi Greenstone Belt Of Ontario
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Author : J. Ayer
language : en
Publisher:
Release Date : 1999
Late Archean Rock Types And Controls On Gold Mineralization In The Southern Abitibi Greenstone Belt Of Ontario written by J. Ayer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Geology, Stratigraphic categories.
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 Greenstone Belts
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Author : K.C. Condie
language : en
Publisher: Elsevier Health Sciences
Release Date : 1981
Archean Greenstone Belts written by K.C. Condie and has been published by Elsevier Health Sciences this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Science categories.
Selected Studies Of Archean Gneisses And Lower Proterozoic Rocks Southern Canadian Shield
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Author : G. B. Morey
language : en
Publisher: Geological Society of America
Release Date : 1980
Selected Studies Of Archean Gneisses And Lower Proterozoic Rocks Southern Canadian Shield written by G. B. Morey and has been published by Geological Society of America this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Science categories.
Structural Kinematic And Metallogenic Evolution Of Selected Domains Of The Pilbara Granitoid Greenstone Terrain
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Author : Tanja Elsa Zegers
language : en
Publisher: Faculteit Aardwetenschappen Universiteit Utrecht
Release Date : 1996
Structural Kinematic And Metallogenic Evolution Of Selected Domains Of The Pilbara Granitoid Greenstone Terrain written by Tanja Elsa Zegers and has been published by Faculteit Aardwetenschappen Universiteit Utrecht this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 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
Fluid Inclusions And Archean Lode Gold Lake Of The Woods Ontario Canada
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Author : Abdalla K. Musallam
language : en
Publisher:
Release Date : 1989
Fluid Inclusions And Archean Lode Gold Lake Of The Woods Ontario Canada written by Abdalla K. Musallam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.
Overview Of Results From The Greenstone Architecture Project Discover Abitibi Initiative
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Author : Ayer, John Albert
language : en
Publisher:
Release Date : 2005
Overview Of Results From The Greenstone Architecture Project Discover Abitibi Initiative written by Ayer, John Albert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Geology categories.
Archean Base And Precious Metal Deposits Southern Abitibi Greenstone Belt Canada
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Author : Thomas Monecke
language : en
Publisher:
Release Date : 2017
Archean Base And Precious Metal Deposits Southern Abitibi Greenstone Belt Canada written by Thomas Monecke and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Abitibi Greenstone Belt (Ont. and Québec) categories.
The Abitibi greenstone belt of eastern Canada represents the world's largest Neoarchean terrane of supracrustal rocks. Straddling the border between the provinces of Ontario and Quebec, the belt covers an area that is approximately 700 km from southeast to northwest and 350 km from north to south. The belt is comprised of several major east-trending successions of folded volcanic and sedimentary rocks, with intervening intrusions. The supracrustal rocks of the Abitibi greenstone belt are uniquely well preserved and have mostly been overprinted only at a low metamorphic grade, allowing the study of primary geological relationships.
Genesis Of Archean Volcanic Hosted Gold Deposits
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Author : Ontario Geological Survey
language : en
Publisher: Ontario Ministry of Northern Development and Mines
Release Date : 1981
Genesis Of Archean Volcanic Hosted Gold Deposits written by Ontario Geological Survey and has been published by Ontario Ministry of Northern Development and Mines this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Science categories.