Hydrothermal Evolution Of Two Stages Of Gold Mineralization At The Orogenic New Celebration Gold Deposit And Implications For Gold Mineralization Within The Kalgoorlie Kambalda Corridor Eastern Goldfields Province Western Australia
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Hydrothermal Evolution Of Two Stages Of Gold Mineralization At The Orogenic New Celebration Gold Deposit And Implications For Gold Mineralization Within The Kalgoorlie Kambalda Corridor Eastern Goldfields Province Western Australia
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Author : Joanna L. Hodge
language : en
Publisher:
Release Date : 2010
Hydrothermal Evolution Of Two Stages Of Gold Mineralization At The Orogenic New Celebration Gold Deposit And Implications For Gold Mineralization Within The Kalgoorlie Kambalda Corridor Eastern Goldfields Province Western Australia written by Joanna L. Hodge and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Gold categories.
[Truncated abstract] The Archean orogenic New Celebration gold deposit, located in the Kalgoorlie Terrane of the Eastern Goldfields Province, Western Australia, is hosted within the western segment of the first-order Boulder Lefroy fault zone (BLFZ). This setting contrasts with the majority of orogenic lode gold deposits worldwide, which are typically located in higher order splays, and as such, the New Celebration deposit provides a unique opportunity to study the hydrothermal, structural, alteration and fluid characteristics of a first-order crustal scale shear zone. Fluid inclusion, sulfur isotope and mineral chemistry were used to reconstruct the evolution of hydrothermal fluids within the BLFZ. Vein petrography, fluid inclusion microthermometry and laser ablation-inductively coupled plasma-mass spectrometry microanalysis (LA-ICP-MS) of single fluid inclusions, in addition to laser ablation sulfide sulfur isotope analyses and LA-ICP-MS mineral chemistry were combined to determine the pressure-temperaturecomposition evolution of the New Celebration gold deposit. At New Celebration, gold mineralization took place in two stages: Stage I, which is related to ductile, sinistral oblique slip fault movement and Stage II, which is related to brittle-ductile and brittle strike-slip fault movement. Type 2 quartz and quartzcalcite shear and extension veins concomitant with Stage I gold mineralization contain pseudo-secondary 2- and 3-phase aqueous-carbonic (10 ± 1 to 33 ± 13 mole % CO2) inclusions with salinities between 2 and 8 equiv. wt. percent NaCl, which were trapped between 330° and 390° C and 3.2 and 4.0 kbars. Mixed aqueous-carbonic inclusions (16 ± 3to 53 ± 28 mole % CO2) and aqueous”carbonic fluid (3 mole % CO2) inclusions with variable phase ratios and salinities of 1.9 ± 1.1to 8.7 ± 2.6 equiv. wt. percent NaCl in type 3 quartz-pyrite±sericite±calcite veins and quartz-calcite alteration associated with Stage II gold mineralization were trapped between 280° and 320° C and 0.8 to 3.2 kbars. Coexisting liquid- and vapor-rich inclusions within the same trail or cluster indicate these inclusions were trapped during phase separation. Secondary high-salinity (18.4 to 23.3 equiv. wt. % NaCl) aqueous inclusions, and metane inclusion, which postdated gold mineralization, were trapped in type 2 and type 3 veins between 100° C and 180° C and pressures below 1 kbar. Single inclusion laser ablation inductively coupled plasma mass spectrometry analyses on aqueous and aqueous-carbonic inclusions indicate that the Stage I gold related fluids were characteristically NaCa>K> Mg (K/Ca 1) whereas Stage II fluids are NaMg>K”Ca (K/Ca >1) and contained higher concentrations of, Pb, Zn, As, and W than Stage I fluids. Average Au concentrations from both Stage I and Stage II-related aqueous-carbonic inclusions returned values around 5 parts per million (ppm) although individual inclusions contained up to 51 ppm. Variations in metal ratios and elemental concentrations, in addition to K/Ca ratios potentially indicate different fluid sources for each mineralizing event and suggest that a switch occurred in fluid and/or metal sources between Stage I and Stage II...
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.
The Interplay Between Physical And Chemical Processes In The Formation Of World Class Orogenic Gold Deposits In The Eastern Goldfields Province Western Australia
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Author : Paul Hodkiewicz
language : en
Publisher:
Release Date : 2003
The Interplay Between Physical And Chemical Processes In The Formation Of World Class Orogenic Gold Deposits In The Eastern Goldfields Province Western Australia written by Paul Hodkiewicz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Gold ores categories.
[Formulae and special characters can only be approximated here. Please see the pdf version of the abstract for an accurate reproduction.] The formation of world-class Archean orogenic gold deposits in the Eastern Goldfields Province of Western Australia was the result of a critical combination of physical and chemical processes that modified a single and widespread ore-fluid along fluid pathways and at the sites of gold deposition. Increased gold endowment in these deposits is associated with efficient regional-scale fluid focusing mechanisms and the influence of multiple ore-depositional processes at the deposit-scale. Measurement of the complexity of geologic features, as displayed in high-quality geologic maps of uniform data density, can be used to highlight areas that influence regional-scale hydrothermal fluid flow. Useful measurements of geological complexity include fractal dimensions of map patterns, density and orientation of faults and lithologic contacts, and proportions of rock types. Fractal dimensions of map patterns of lithologic contacts and faults highlight complexity gradients. Steep complexity gradients, between domains of high and low fractal dimensions within a greenstone belt, correspond to district-scale regions that have the potential to focus the flow of large volumes of hydrothermal fluid, which is critical for the formation of significant orogenic gold mineralization. Steep complexity gradients commonly occur in greenstone belts where thick sedimentary units overly more complex patterns of lithologic contacts, associated with mafic intrusive and mafic volcanic units. The sedimentary units in these areas potentially acted as seals to the hydrothermal Mineral Systems, which resulted in fluid-pressure gradients and increased fluid flow. Fawl.
Gold Transporting Hydrothermal Fluids In The Earth S Crust
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Author : P.S. Garofalo
language : en
Publisher: Geological Society of London
Release Date : 2014-09-16
Gold Transporting Hydrothermal Fluids In The Earth S Crust written by P.S. Garofalo and has been published by Geological Society of London this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-09-16 with Science categories.
Hydrothermal ore deposits that are exploited for gold include both gold-only deposits, such as orogenic deposits, and gold-bearing examples of the common hydrothermal deposits types that are formed around upper-crustal magmatic centres, in particular porphyry and epithermal deposits. Fluid-inclusion data have shown that ore fluids of gold-only deposits are compositionally distinct compared to fluids of other deposit types. This Special Publication includes an up-to-date summary of thermodynamic parameters of aqueous Au species at high temperatures and pressures; a dataset of fluid inclusion properties and compositions from orogenic deposits of different parts of the world; several comprehensive case studies of different types of gold deposits and their fluids from USA, Brazil, Egypt, Slovakia and Bulgaria; and numerical modelling aimed to define key parameters that affect fluid flow and gold deposition at a range of scales.
A Century Of Gold Mining At Kalgoorlie
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Author : G. Neil Phillips
language : en
Publisher:
Release Date : 1993
A Century Of Gold Mining At Kalgoorlie written by G. Neil Phillips and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Gold mines and mining categories.
Gold Mineralization
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Author : J. E. Glover
language : en
Publisher:
Release Date : 1979
Gold Mineralization written by J. E. Glover and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Gold categories.
Recent Advances In Understanding Precambrian Gold Deposits
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Author : University of Western Australia. Department of Geology
language : en
Publisher:
Release Date : 1987
Recent Advances In Understanding Precambrian Gold Deposits written by University of Western Australia. Department of Geology and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Geology, Stratigraphic categories.
Fluid Evolution And Pressure Regimes In The Campbell Red Lake Gold Deposit Red Lake Mine Trend Red Lake Ontario
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Author :
language : en
Publisher:
Release Date : 2003
Fluid Evolution And Pressure Regimes In The Campbell Red Lake Gold Deposit Red Lake Mine Trend Red Lake Ontario written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
The nature of hydrothermal systems related to gold mineralization (epithermal versus orogenic) is important for exploration in the Red Lake mine trend since the two styles of mineralization show significant variations in terms of setting, geometry, and timing relative to deformation & metamorphism, and consequently of exploration models. Since epithermal & orogenic systems differ most significantly in their formation depths, it is believed that fluid inclusions, which can provide information about fluid pressures & compositions, can be used to help discriminate these origins. This paper describes a study of fluid inclusions in quartz grains assigned to pre-, syn-, and post-main-stage gold mineralization in the Campbell-Red Lake gold deposit. Fluid pressure data obtained from the inclusions is used to discuss the depths of carbonate veining & mineralization and the causes of fluctuation of fluid pressures among hydrothermal activity stages. Fluid composition data obtained from Raman analyses are also discussed with regard to mechanisms of gold transportation & precipitation.
The Geochemistry Of Gold In Hydrothermal Deposits
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Author : Samuel B. Romberger
language : en
Publisher:
Release Date : 1988
The Geochemistry Of Gold In Hydrothermal Deposits written by Samuel B. Romberger and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Geochemistry categories.
Geophysical Exploration For Precambrian Gold Deposits
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Author : Hugh A. Doyle
language : en
Publisher:
Release Date : 1984
Geophysical Exploration For Precambrian Gold Deposits written by Hugh A. Doyle and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Geology, Stratigraphic categories.