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Gold Deposits in Amphibolite and Granulite Facies

1998-1-1  Gold introduction at greenschist conditions during the retrograde evolution of the terranes is ruled out from some of the common mineralogical settings of gold. It is generally in equilibrium with high-temperature gangue minerals and can be as invisible gold in loellingite that was overprinted by arsenopyrite prior to cooling below amphibolite ...

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SYN-METAMORPHIC GOLD DEPOSITS IN AMPHIBOLITE

2016-9-19  Australia, a major gold province which currently provides about 7% of annual gold produc-tion, although most gold deposits, including the world-class Kalgoorlie deposits, are hosted in greenschist-facies terrains, about 15% of gold resources are in amphibolite- and granulite-facies terrains.

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A rare Phanerozoic amphibolite-hosted gold deposit at ...

2018-11-3  Gold fineness ranges from 778 to 896 (mean 821: Fan et al. 2013), which is lower than the gold fineness of > 900 that typifies most Archean amphibolite-facies gold deposits (Morrison et al. 1991; Knight et al. 1993). The ore minerals at the Danba deposit can be described in terms of two distinct assemblages within a single mineralization event ...

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Minerals Free Full-Text Gold Prospects in the Western ...

The grade of metamorphism varies from greenschist to upper amphibolite facies, but the mineralized rocks are mainly lower amphibolite metamorphosed, close to the transition from greenschist to amphibolite

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Sulfur radical species form gold deposits on Earth PNAS

2015-11-3  This capacity to preconcentrate gold at the amphibolite stage requires a more attentive exploration of high-grade metamorphic terrains for yet undiscovered gold deposits or Au-enriched source rocks. This gold may be subsequently remobilized by

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Exceptional Concentrations of Gold Nanoparticles in 1,7 Ga ...

2020-1-24  The gold mineralization is localized in the metamorphic rocks (two-mica gneisses and amphibolites) of Archean age (2.6–2.8 Ga), that were overprinted by Proterozoic regional epidote-amphibolite ...

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On the source of orogenic gold Geology GeoScienceWorld

Gold has historically been a key strategic commodity, and the study of gold deposit formation has long been investigated. Debate on the genesis of so-called “orogenic gold deposits” (>75% of gold recovered through history; Phillips, 2013), continues largely because it is difficult to reliably identify the source of gold.In this issue of Geology, Gaboury.

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Geochemistry of hydrothermal gold deposits: A review ...

2011-7-1  3. The geochemical behavior of gold in hydrothermal systems. The occurrence of gold mainly depends on temperature, pressure, pH values, Cl − concentration, and fugacity of H 2 S in a hydrothermal system. Gold mostly occurs as AuCl − 2 in a system with temperature higher than 400 °C (Gammons and Williams-Jones, 1997), and with decreasing temperature being the primary

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Lower crustal resistivity signature of an orogenic gold ...

2021-8-4  Orogenic gold deposits in upper crustal settings are a significant source of the world’s gold resources, but their origin depth is contentious 1,2,3,4,5,6,7,8 The 440 Ma orogenic belt in south ...

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A holistic model for the origin of orogenic gold deposits ...

2019-6-15  The term orogenic gold deposits has been widely accepted, but there has been continuing debate on their genesis. Early syn-sedimentary or syn-volcanic models and hydrothermal meteoric-fluid models are now invalid. Magmatic-hydrothermal models fail because of the lack of consistent spatially associated granitic intrusions and inconsistent temporal relationships. The most plausible models ...

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Geology and Geochemistry of Selected Gold Deposits in

The amphibolite enclaves in the alkali-rich porphyry body confirmed the existence of the Neoproterozoic lower crust, whereas the high gold and copper content in the amphibolite proved that the metal components originated from the Neoproterozoic lower crust (Hou et al., 2017) .

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Unravelling the upper-amphibolite facies Glenburgh gold ...

2018-10-24  KEYWORDS: amphibolite facies, geochronology, gold, metamorphism, migmatite Introduction ‘Orogenic’ gold deposits commonly form in greenschist facies terrains, and are rare in high-grade metamorphic rocks (Groves, 1993). This is conventionally attributed to gold mineralization forming from gold complexes

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Sulfur radical species form gold deposits on Earth PNAS

2015-11-3  This capacity to preconcentrate gold at the amphibolite stage requires a more attentive exploration of high-grade metamorphic terrains for yet undiscovered gold deposits or Au-enriched source rocks. This gold may be subsequently remobilized by

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Amphibolite: Metamorphic Rock - Pictures, Definition

Amphibolite is a coarse-grained metamorphic rock that is composed mainly of green, brown, or black amphibole minerals and plagioclase feldspar. The amphiboles are usually members of the hornblende group. It can also contain minor amounts of other

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Lower crustal resistivity signature of an orogenic gold ...

2021-8-4  Orogenic gold deposits in upper crustal settings are a significant source of the world’s gold resources, but their origin depth is contentious 1,2,3,4,5,6,7,8 The 440 Ma orogenic belt in south ...

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Minerals Free Full-Text Hybrid Failure of Cemented ...

2021-10-17  The ores are predominately amphibolite-facies Archean load gold deposits . The deposits were extracted with a mixture of long hole and Alimak stopes and subsequently backfilled with CPB. The ore is milled to paste consistency with more than 45% passing 0.020 mm as shown in Figure 1 [18,20]. The tailing stream consists of silica, quartz ...

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8 Metamorphic Minerals and Metamorphic Rocks –

Although hard to see, the specimen contains native gold near the bottom of the sample. If you enlarge the photo you can see the gold. At still higher grade, chlorite, epidote, and actinolite break down by dehydration reactions, producing a specific kind of rock called an amphibolite. The photo in

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A holistic model for the origin of orogenic gold deposits ...

2019-6-15  The term orogenic gold deposits has been widely accepted, but there has been continuing debate on their genesis. Early syn-sedimentary or syn-volcanic models and hydrothermal meteoric-fluid models are now invalid. Magmatic-hydrothermal models fail because of the lack of consistent spatially associated granitic intrusions and inconsistent temporal relationships. The most plausible models ...

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Gold - Department for Energy and Mining

2021-11-8  The gold content (by weight) of an alloy is described in carats; pure gold (24 carat) is used in the Australian Nugget coins; 18 carat gold is 18/24 pure gold; 6/24 is an alloy metal Because of its rarity, durability, colour and chemical inertness, gold has

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Transport and coarsening of gold nanoparticles in an ...

2021-3-11  The Kenty orogenic Au deposit (Fig. 1) is located in the central part of the Swayze area.It was discovered in the 1930s and is characterized by high-grade ore zones with coarse gold. Kenty is

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2635 Ma amphibolite facies gold mineralisation near a ...

2007-10-25  The Archaean gneiss complex of the Nuuk region contains several occurrences of amphibolite facies gold mineralisation (summaries by Appel et al., 2000, Appel et al., 2003, Møller Stensgaard et al., 2006).The largest gold mineralisation (locally up to 36 g/t) occurs on the island of Storø in a tectonic slice of amphibolites and quartzo-feldspathic metasedimentary rocks (Fig. 1, Fig. 2).

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Amphibolite facies gold mineralization: an exemple from ...

However, being an atypical gold deposit, the key geological parameters involved in its genesis need to be identified in order to understand its formation and define exploration criteria that will help discover similar gold deposits in the James Bay territory and elsewhere

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Geological and geochemical characterization of the Nanlia ...

2021-8-1  Gold mineralization in the Nanlia prospect is hosted by nearly E-W trending and S dipping quartz veins (Fig. 3a, b).The mineralized quartz veins are oriented either parallel or at low angle to the foliation of the amphibolite host rock, ranging in thicknesses from 5 to 50 cm (Fig. 3a).Late barren extensional quartz veins, crosscutting the foliation of the host amphibolite are commonly observed ...

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Sulfur radical species form gold deposits on Earth PNAS

2015-11-3  This capacity to preconcentrate gold at the amphibolite stage requires a more attentive exploration of high-grade metamorphic terrains for yet undiscovered gold deposits or Au-enriched source rocks. This gold may be subsequently remobilized by

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for the Year Ended 30 June 2021

Gold assays for the surface rock-chips retuned four samples grading over 0.1g/t gold, with the highest concentration being 2.7g/t. The gold-bearing samples occur in amphibolite containing sulphides and garnet, giving a mineralogical (therefore visual) constraint on the likely zone of gold concentration.

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Early Paleozoic Orogenic Gold Deposit in the Cathaysia ...

2021-1-8  The Shuangqishan gold deposit (>20t gold) is located in a hitherto poorly-documented gold province in the southeastern Cathaysia Block, South China. It is hosted by Neoproterozoic amphibolite-facies metamorphic rocks and consists of quartz-sulfide ...

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Minerals Free Full-Text Hybrid Failure of Cemented ...

2021-10-17  The ores are predominately amphibolite-facies Archean load gold deposits . The deposits were extracted with a mixture of long hole and Alimak stopes and subsequently backfilled with CPB. The ore is milled to paste consistency with more than 45% passing 0.020 mm as shown in Figure 1 [18,20]. The tailing stream consists of silica, quartz ...

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Distribution of Gold Ill Igneous Rocks - USGS

2011-11-10  Distribution of Gold Ill • Igneous Rocks By DAVID GOTTFRIED, JACK ].ROWE, and ROBERT I. TILLING GEOLOGICAL SURVEY PROFESSIONAL PAPER 727 An investigation of the abundance and distribution of gold in plutonic and volcanic rocks of diverse magma types and tectonic settings UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON: 1972

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Transport and coarsening of gold nanoparticles in an ...

2021-3-11  The Kenty orogenic Au deposit (Fig. 1) is located in the central part of the Swayze area.It was discovered in the 1930s and is characterized by high-grade ore zones with coarse gold. Kenty is

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李元----中国科学院广州地球化学研究所 - CAS

Gold solubility and partitioning between sulfide liquid, monosulfide solid solution, and hydrous mantle melts: Implications for the formation of Au-rich magmas and crust-mantle differentiation. Geochimica et Cosmochimica Acta. 118, 247-262. 27. Liu, J., Wu, G.

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