Turbidite Hosted Gold Deposits
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Turbidite Hosted Gold Deposits
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Author : J. Duncan Keppie
language : en
Publisher: St. John's, Nfld., Canada : Geological Association of Canada
Release Date : 1986
Turbidite Hosted Gold Deposits written by J. Duncan Keppie and has been published by St. John's, Nfld., Canada : Geological Association of Canada this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Science categories.
Turbidite Hosted Gold Deposits
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Author : Prudence Mary Leeming
language : en
Publisher:
Release Date : 1985
Turbidite Hosted Gold Deposits written by Prudence Mary Leeming and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.
A Comparative Study Of The Turbidite Hosted Gold Deposits In The Bendigo Ballarat And Melbourne Zones Central Victoria Australia
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Author : Zhan Lin Gao
language : en
Publisher:
Release Date : 1994
A Comparative Study Of The Turbidite Hosted Gold Deposits In The Bendigo Ballarat And Melbourne Zones Central Victoria Australia written by Zhan Lin Gao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Geology, Stratigraphic categories.
Turbidite Hosted Micro Disseminated Gold Deposits
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Author : Xuexiang Gu
language : en
Publisher:
Release Date : 1996
Turbidite Hosted Micro Disseminated Gold Deposits written by Xuexiang Gu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
Turbidite Hosted Gold Deposits Meguma Domain Eastern Nova Scotia
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Author : P. K. Smith
language : en
Publisher:
Release Date : 1985
Turbidite Hosted Gold Deposits Meguma Domain Eastern Nova Scotia written by P. K. Smith and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Geology categories.
Controls On Genesis Distribution And Nature Of The Turbidite Hosted Gold Deposits Eastbelt Southwestern Slave Structural Province Yellowknife Northwest Territories
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Author : Mark Wesley Richardson
language : en
Publisher:
Release Date : 2020
Controls On Genesis Distribution And Nature Of The Turbidite Hosted Gold Deposits Eastbelt Southwestern Slave Structural Province Yellowknife Northwest Territories written by Mark Wesley Richardson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
The Ptarmigan and Tom mesothermal gold deposits are located 10 km to the northeast of the city of Yellowknife, Northwest Territories. Both gold deposits comprise a series of en echelon veins. These veins are hosted within upper greenschist to lower amphibolite facies ~2630 Ma rocks. A low-temperature reduced hydrothermal environment during ore deposition formed as either a part of the main arsenopyrite-dominated mineralization or a distinct late-stage ore-formation event. At the deposit scale, the high-grade gold ores are preferentially developed with three contextual scenarios: (1) along contacts, especially the contact between black siltstone host rock and major barren, cleavage-parallel veins; (2) the contact between quartz laminae and carbonaceous host rock slivers; (3) proximity to bismuth telluride mineralization. Thus, competent, barren quartz veins along the axial plane of fold/thrust belts locally host superimposed gold mineralization and provide favourable targets for gold exploration. Hydrothermal apatite is a common accessory mineral in both mineralized and non-mineralized quartz veins in the metasedimentary host rocks that constitute the Ptarmigan and Tom deposits. The apatite in this study likely formed coeval with early stages of sulphide precipitation. The apatite age of 2585 ± 15 Ma is consistent with the intrusions of the 2605 and 2590 Ma two-mica granites of the Prosperous Suite. The near-concordant [superscript 204]Pb-corrected data of the LCT pegmatite hosted apatite reveals two clusters of ages. An older population with an intercept age (N = 4) of 2581 ± 15 Ma, and a younger population with an intercept age (N = 3) of 2519 ± 12 Ma . Furthermore, plotting a regression through all near – concordant data for the pegmatite hosted apatite hints that metamorpic resetting occured around ~2200 Ma. The distribution and abundance of major, minor, and trace elements from in-situ recovered apatite were studied to characterize the nature of mineralizing fluids. Most apatite from mineralized and non-mineralized veins show different Mn, Sr, and Pb contents, as well as chondrite-normalized rare-earth element (REE) and Y abundance patterns. REEs display five unique chondrite-normalized patterns: (1) negative sloped pattern with slight negative Eu anomaly, (2) a flat pattern with a positive Eu anomaly, (3) a positive slope with a negative Eu anomaly, (iv) light rare earth element (LREE) depleted pattern with positive Eu anomaly, and (v) bell-shaped pattern with a negative Eu anomaly. The REE patterns likely reflect both the source of the auriferous hydrothermal fluids and, perhaps, co-precipitating mineral phases. Apatite from the Ptarmigan vein occurs with both: (1) a flat pattern with a positive Eu anomaly and (2) bell-shaped pattern with a negative Eu anomaly. The bell-shaped and flat patterns typify orogenic gold deposits. Vein-hosted apatite commonly displays compositional zoning with a characteristic yellow cathodoluminescence (CL) emission spectra with darker cores and brighter rims. The cores have lower REE, whereas the rims are notably REE higher. It is thought that the darker cores in CL images reflect a transition from an early low REE hydrothermal fluid to one enriched in REE. Lastly, this study breaks ground for conducting a more robust study to classify the trace-element composition of apatite in gold deposits worldwide.
The Lithogeochemical And Mineralogical Setting Of Turbidite Hosted Arsenic Gold Deposits In The Lower Palaeozoic Of Scotland
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Author : Paul R. Duller
language : en
Publisher:
Release Date : 1989
The Lithogeochemical And Mineralogical Setting Of Turbidite Hosted Arsenic Gold Deposits In The Lower Palaeozoic Of Scotland written by Paul R. Duller 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.
Detrital gold is widely dispersed in the Southern Uplands and attributed to minor Au-bearing vein mineralisation hosted by Ordovician and Silurian turbidites. Field, mineralogical and geochemical studies in the Glendinning area indicate the pervasive and laterally extensive nature of hydrothermal alteration and element zonation associated with As-Sb-Au mineralization. Geochemical anomalies are characterised by elevated chalcophile (As, Sb, S, Cu. Pb, Ti, Hg) and depleted siderophile (Fe, Mg, Zn) and alkali group (Na) elements. Broad areas of sodium depletion are indicative of primary hydrothermal activity and together with anomalous arsenic values locate 8 zones of As-Sb- Au-Hg mineralization within 10km of the Glendinning mine and some 60 locations elsewhere in the Southern Uplands of Scotland and the Longford Down, Ireland. Electron microprobe studies demonstrate that an initial phase of arsenopyrite mineralisation forms the principal locus of submicroscopic and lattice-hosted gold concentration in the Glendinning, Knipe, Cairngarroch Bay and Clontibret As-Sb-Au deposits. Gold deposition was initiated during wallrock alteration and hydraulic brecciation, possibly as a result of fluid chilling, while later stibnite vein deposition was accompanied and overprinted by minor chalcopyrite, sphalerite, galena and a variety of sulphosalts. Hydrothermal alteration and As-Au mineralisation in the Southern Uplands postdates arc-related volcanism, turbidite deposition and early deformation. The model envisaged invokes the discharge of highly reducing, sulphur-rich hydrothermal fluids, related to the emplacement of structurally constrained, late Silurian calc-alkaline minor intrusives at the close of the Caledonian orogeny. Different levels of crustal emplacement and subsequent exhumation are considered to explain the various styles of As-Sb-Au mineralization exposed in the Southern Uplands. The complex tectonic hlstory of the Southern Uplands and Longford Down is mirrored by significant variations in the chemical composition of strike parallel greywacke tracts admixed with sediments derived from ophiolites, calc-alkaline volcanic arcs, stable cratons and carbonate shelves. Non-parametric K-means cluster analysis applied to 840 petrographlcally defined samples, determined the chemical variation within each petrofacies and provides a satisfactory method of classifying individual members. Geochemical traverses through the Southern Uplands and Longford Down reveal lateral continuity over a strike length of 350km.
Turbidite Hosted Gold Deposits Meguma Domain Eastern Nova Scotia
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Author : P. K. Smith
language : en
Publisher:
Release Date : 1985
Turbidite Hosted Gold Deposits Meguma Domain Eastern Nova Scotia written by P. K. Smith and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.
Turbidite Hosted Gold Deposits Meguma Domain Eastern Nova Scotia
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Author : Geological Association of Canada
language : en
Publisher:
Release Date :
Turbidite Hosted Gold Deposits Meguma Domain Eastern Nova Scotia written by Geological Association of Canada and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
Turbidite Hosted Gold Mineralization At The Dolaucothi Gold Mines Dyfed Wales United Kingdom
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Author : D. E. Annels
language : en
Publisher:
Release Date :
Turbidite Hosted Gold Mineralization At The Dolaucothi Gold Mines Dyfed Wales United Kingdom written by D. E. Annels and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.