Evidence of upgrading of gold tenor in an orogenic quartz-carbonate vein system by late magmatic-hydrothermal fluids at the Madrid Deposit, Hope Bay Greenstone Belt, Nunavut, Canada

Kerr, Mitchell J.; Hanley, Jacob J.; Kontak, Daniel J.; Morrison, Gordon G.; Petrus, Joseph A.; Fayek, Mostafa; Zajacz, Zoltán

doi:10.1016/j.gca.2018.08.030

Cited by 43 publications

(19 citation statements)

References 148 publications

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“…Similarly to what has been widely documented for sulphide-bearing ore deposits (e.g. Sung et al, 2009;Zhao et al, 2011;Peterson and Mavrogenes, 2014;Velasquez et al, 2014;Genna and Gaboury, 2015;Belousov et al, 2016;Salvi et al, 2016;Augustin and Gaboury, 2018;Kerr et al, 2018;Gao et al, 2019;Wu et al, 2019a), the coupling between deposit-scale petrological-structural study, textural characterisation and LA-ICP-MS analyse of pyrite helps tracking gold endowment steps resulting in the formation of the GSS gold deposit (Fig. 11):…”

Section: 2mentioning

confidence: 77%

Structural and geochemical ore-forming processes in deformed gold deposits: towards a multiscale and multimethod approach

Perret

André-Mayer

Eglinger

et al. 2021

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Integrating structural control on mineralisation and geochemical ore-forming processes is crucial when studying deformed ore deposits. Yet, structural and geochemical data are rarely acquired at the same scale: structural control on mineralisation is typically investigated from the district to the deposit and macroscopic scales whereas geochemical ore processes are described at the microscopic scale. The deciphering of a deformation-mineralisation history valid at every scale thus remains challenging.This study proposes a multi-scale approach that enables the reconciliation of structural and geochemical information collected at every scale, applied to the example of the Galat Sufar South gold deposit, Nubian shield, northeastern Sudan. It gathers field and laboratory information by coupling a classical petrological-structural study with high-resolution X-ray computed tomography, electron back-scattered diffraction and laser ablation inductively-coupled plasma mass spectrometry on mineralised sulphide mineral assemblages.This approach demonstrates that there is a linear control on mineralisation expressed from the district to microscopic scales at the Galat Sufar South gold deposit. We highlight the relationships between Atmur-Delgo suturing tectonics, micro-deformation of sulphide minerals, syn-pyrite recrystallisation metal remobilisation, gold liberation and ore upgrading. Our contribution therefore represents another step forward a holistic field-to-laboratory approach for the study of any other sulphide-bearing, structurally-controlled ore deposit type.Supplementary material at https://doi.org/10.6084/m9.figshare.c.5635726

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Section: 2mentioning

confidence: 77%

Structural and geochemical ore-forming processes in deformed gold deposits: towards a multiscale and multimethod approach

Perret

André-Mayer

Eglinger

et al. 2021

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“…This gold event is represented at Beaver Dam, The Ovens, Dufferin, Touquoy, Upper Seal Harbour, Tangier and Caribou deposits. Thus, there is some evidence for possibly multiple hydrothermal events in these deposits (e.g., Beaver Dam), the degree and significance of which remains unquantified, as has also been recorded in other orogenic gold deposit settings (e.g., Wagner et al, 2007;Lawley et al, 2015;Kerr et al, 2018). 2O).…”

Section: Geological and Geochemical Parameters Of Meguma Gold Depositsmentioning

confidence: 78%

“…A considerable advance in our understanding of the complex evolution and paragenesis of many gold deposit settings, such as multi-stage mineralizing events and/or remobilization, has been revealed through integration of classic petrographic and imaging methods (e.g., EMPA, SEM-EDS) with quantitative laser ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS) element distribution analyses (i.e., maps, traverses, spots) of Fe As sulfide phases (e.g., Large et al, 2007Large et al, , 2009Zhoa et al, 2011;Lawley et al, 2015;Neyedley et al, 2017;Gourcerol et al, 2018a;Kerr et al, 2018;Dubosq et al, 2018;Wu et al, 2018Wu et al, , 2019. As a means to extract further information from such map and traverse data, Gourcerol et al (2018aGourcerol et al ( , 2018b introduced the novel concept of time slice domains (TSD) which essentially converts the LA traverse data used to construct maps into point analyses.…”

Section: Introductionmentioning

confidence: 99%

“…bined with other concepts of data treatment, such as elemental paragenesis, multi-element plots and a variety of statistical approaches, it provides the means to assess the complexities of gold paragenesis, that is primary versus subsequent mobilization and upgrading or addition of new gold (e.g., Lawley et al, 2015;Augustin et al, 2017;Masurel et al, 2019). This latter approach has been successfully applied to better constrain the nature of gold (i.e., visible to invisible) in several deposit settings in Canada, including Archean BIF-hosted mineralization (e.g., the Meadowbank and Musselwhite deposits, the Meliadine gold district; Gourcerol, 2018a), the Archean orogenic Bisset Lake deposit, (Neyedley et al, 2017), the Archean intrusion-related Renabie deposit (McDivitt, 2016), and the hybrid orogenic-intrusion related Archean Madrid deposit, Hope Bay (Kerr et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Application of LA ICP-MS analysis of arsenopyrite to gold metallogeny of the Meguma Terrane, Nova Scotia, Canada

et al. 2020

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Investigation of gold metallogeny in the Paleozoic Meguma terrane (Canada) is conducted through LA-ICP-MS analysis of arsenopyrite collected from eight slate-belt style vein gold deposits using a novel approach integrating elemental distribution maps and their derived elemental paragenesis with multi-element binary plots. The data reveal two distinct gold events: 1) an early event characterized by a Co-Ni-Mo-Sb-Se elemental association related to initial growth of arsenopyrite that reflects the presence of invisible gold (>10 ppm); and 2) a second event, spatially associated with late fracture sets, that is characterized by an Al-Ti-V-Mn element association and reflects either remobilization or upgrading of primary invisible gold and is manifest as visible gold.The results of this study indicate a complex and protracted history of gold mineralization which has important ramifications for the Meguma gold deposits, as well as other orogenic gold districts globally. In the case of the Meguma Terrane, it involves an initial gold event that is followed by element mobilization and, in the case of precious metals (Au, Ag), an upgrading through a zone refining process. In addition, the variable coupling and decoupling of elements is only revealed using in-situ derived LA-ICP-MS data.

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“…Another important issue in the study of lode gold deposits is the mechanisms responsible for gold deposition. Precipitation of gold in lode deposits is commonly attributed to depressurization and boiling of fluids and/or fluid–rock interaction ( 2 , 6 , 12 – 14 ). With regard to fluid mixing between the ore fluid and an external component (commonly meteoric water), the prevalent viewpoint is that this process, if any, occurs merely in the late stage of mineralization and thus makes little or no contribution to gold deposition ( 2 , 5 , 6 , 13 , 14 ).…”

mentioning

confidence: 99%

Garnet secondary ion mass spectrometry oxygen isotopes reveal crucial roles of pulsed magmatic fluid and its mixing with meteoric water in lode gold genesis

Fan

Valley

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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Significance There is a common consensus that lode gold deposits mostly precipitated from metamorphic fluids via fluid boiling and/or fluid–rock interaction, but whether magmatic hydrothermal fluids and the mixing of such fluids with an external component have played a vital role in the formation of lode gold deposits remains elusive. We use garnet secondary ion mass spectrometry oxygen isotope analysis to demonstrate that the world-class Dongping lode gold deposit has been formed by multiple pulses of magmatic hydrothermal fluids and their mixing with large volumes of meteoric water. This study opens an opportunity to tightly constrain the origin of lode gold deposits worldwide and other hydrothermal systems that may have generated giant ore deposits in the Earth’s crust.

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Evidence of upgrading of gold tenor in an orogenic quartz-carbonate vein system by late magmatic-hydrothermal fluids at the Madrid Deposit, Hope Bay Greenstone Belt, Nunavut, Canada

Cited by 43 publications

References 148 publications

Structural and geochemical ore-forming processes in deformed gold deposits: towards a multiscale and multimethod approach

Structural and geochemical ore-forming processes in deformed gold deposits: towards a multiscale and multimethod approach

Application of LA ICP-MS analysis of arsenopyrite to gold metallogeny of the Meguma Terrane, Nova Scotia, Canada

Garnet secondary ion mass spectrometry oxygen isotopes reveal crucial roles of pulsed magmatic fluid and its mixing with meteoric water in lode gold genesis

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