A reinterpretation of the role of granitoids in the genesis of Neoproterozoic gold mineralization in the Telfer Dome, Western Australia

Rowins, Stephen M.; Groves, David; McNaughton, Neal J.; Palmer, Martin R.; Eldridge, C. Stewart

doi:10.2113/gsecongeo.92.2.133

Cited by 57 publications

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“…New detailed geochronology has highlighted the coeval nature of Telfer gold mineralization to the regional granites (Schindler, 2014), again implying a relationship between granite emplacement and gold-copper mineralization at Telfer (c.f., Goellnicht et al, 1989;Rowins et al, 1997). We will present a detailed fluid inclusion study of ore forming fluids by microthermometry, laser Raman, and in situ laser ablation inductively coupled plasma mass spectrometry (laser ICP-MS) analyses of Telfer fluid inclusions.…”

Section: Introductionmentioning

confidence: 99%

“…The Neoproterozoic Telfer gold-copper deposit, Western Australia ( The genetic model for this world-class Au deposit has changed over time from a syngenetic sediment-hosted exhalative (e.g., Turner, 1982) to an epigenetic model with possible input from surrounding Neoproterozoic granitic intrusions (e.g., Goellnicht et al, 1989;Goellnicht et al, 1991;Rowins et al, 1997). Goellnicht et al (1989) suggested a mix of magmatic and meteoric fluids for the deposit and a granitic gold-copper source.…”

Section: Introductionmentioning

confidence: 99%

“…Goellnicht et al (1989) suggested a mix of magmatic and meteoric fluids for the deposit and a granitic gold-copper source. Rowins et al (1997) modified this model and proposed that granite is the heat source for convection of hydrothermal fluids that may be partly derived from felsic magma, basinal brines, metamorphic fluids, or meteoric water. In this latter model, the sedimentary rocks are interpreted to be the source for the metals by leaching them with these hydrothermal fluids (Rowins et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, traces of Au-Ag tellurides, xenotime, monazite, tourmaline, and rutile are present in most of the reefs (Rowins et al, 1997). In reefs of upper levels, bornite and chalcocite replace chalcopyrite as a product of supergene enrichment.…”

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confidence: 99%

“…Regional lower greenschist facies metamorphism supports that depth estimate, and no higher metamorphic grade rocks are recognized in the proximity of the Telfer deposit. All metasedimentary rocks of the Telfer Dome are affected by hydrothermal sericitization, silicification and lesser carbonate (calcite-dolomite) and tourmaline replacement (Goellnicht et al, 1989), with alteration most intensely developed immediately around the veins and breccias (Rowins et al, 1997). Chlorite alteration is reported as fracture coating and as a subtle pervasive alteration proximal to mineralization.…”

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confidence: 99%

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Magmatic Hydrothermal Fluids at the Sedimentary Rock-Hosted, Intrusion-Related Telfer Gold-Copper Deposit, Paterson Orogen, Western Australia: Pressure-Temperature-Composition Constraints on the Ore-Forming Fluids

et al. 2016

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The Neoproterozoic Telfer A -copper deposits is located in the Paterson Orogen. Several highly differentiated calc-alkaline to alkali-calcic peraluminous granites intruded the metasedimentary rocks near (5-20 km) Telfer contemporaneous with structurally controlled gold-copper mineralization.Fluid inclusion assemblages with different fluid inclusion types were identified in samples from a range of different vein types. These inclusion types range from three phase aqueous Laq+Vaq+Shalite, high salinity N C C inclusions to two phase aqueous or two phase aqueous carbonic, low to moderate salinity (2 -22 wt % NaCl equiv.), moderate to high 480°C) fluid inclusions.Fluid inclusion trapping mechanisms, and interpreted precipitation mechanisms for gold and copper include: (1) This interpretation is supported by the observation that the highest base metal contents occurs in the highest salinity fluid inclusion.Potassium/Ca ratios of >1 in most assemblages, the high homogenization C in many fluid inclusion assemblages, and the high trace element contents (e.g., Fe, Mg, K, Na) in most of the fluid inclusion assemblages is compatible with

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Magmatic Hydrothermal Fluids at the Sedimentary Rock-Hosted, Intrusion-Related Telfer Gold-Copper Deposit, Paterson Orogen, Western Australia: Pressure-Temperature-Composition Constraints on the Ore-Forming Fluids

et al. 2016

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Fluid circulation in the South Tibetan Detachment System: Evidence from fluid inclusions and oxygen isotope data of quartz veins in the Ramba Dome, North Himalayan Gneiss Domes

Zhang

Cheng

et al. 2021

Geological Journal

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Detachment faults are sites of intensive fluid-rock interactions. Here, we report fluid inclusion and oxygen isotope data for quartz veins in the Ramba Dome in the North Himalayan Gneiss Domes, with an aim to constrain the origin and circulation of crustal fluids associated with the South Tibetan Detachment System (STDS). Microthermometric data for fluid inclusions in quartz indicate that the fluids were aqueous and CO 2 À H 2 O ± CH 4 ± N 2 -bearing with low to moderate salinities (0.60-11.80 wt% eq. NaCl). The entrapment conditions are 295-410 C and 98-135 Mpa, indicating a forming-depth of 8-10 km. Oxygen isotopic compositions (δ 18 O) of quartz measured in situ by secondary ion mass spectrometry and bulk by the BrF 5 method show limited variations in individual quartz veins, but δ 18 O quartz values vary from 12.07 to 18.16‰ (V-SMOW) among veins. The corresponding δ 18 O fluid values range from 7.71 to 13.80‰, based on equilibrium temperatures obtained from fluid inclusions. From the footwall to the detachment zone, δ 18 O fluid values exhibit a broadly decreasing trend and indicate that the STDS dominated the fluid flux pathway in the crust, with more contributions of meteoric water in the detachment zone. We further quantified the contribution of meteoric fluids to 8-27% using a binary end-member mixing model. These data imply that the fluids were predominantly metamorphic/ magmatic in origin, and were mixed with infiltrating, isotopically light, meteoric water during extensional detachment shearing of the STDS. The meteoric water can infiltrate from the surface to 8-10 km depth. K E Y W O R D S fluid circulation, fluid inclusions, gneiss dome, mixing processes, oxygen isotopes, quartz veins, South Tibetan Detachment System 1 | INTRODUCTION Stable isotopes in fluids and minerals have been widely utilized to fingerprint the origins and fluxes of fluids over a wide range of timescales and geological settings, such as in basins, thrust fault zones,

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Orogenic, Amagmatic and Hydrothermal Mineral Systems of Uncertain Origin

Pirajno

2009

Hydrothermal Processes and Mineral Systems

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A reinterpretation of the role of granitoids in the genesis of Neoproterozoic gold mineralization in the Telfer Dome, Western Australia

Cited by 57 publications

References 0 publications

Magmatic Hydrothermal Fluids at the Sedimentary Rock-Hosted, Intrusion-Related Telfer Gold-Copper Deposit, Paterson Orogen, Western Australia: Pressure-Temperature-Composition Constraints on the Ore-Forming Fluids

Magmatic Hydrothermal Fluids at the Sedimentary Rock-Hosted, Intrusion-Related Telfer Gold-Copper Deposit, Paterson Orogen, Western Australia: Pressure-Temperature-Composition Constraints on the Ore-Forming Fluids

Fluid circulation in the South Tibetan Detachment System: Evidence from fluid inclusions and oxygen isotope data of quartz veins in the Ramba Dome, North Himalayan Gneiss Domes

Orogenic, Amagmatic and Hydrothermal Mineral Systems of Uncertain Origin

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