Unravelling the upper-amphibolite facies Glenburgh gold deposit

2018. 10. 24. · Gold deposits are rare in upper-amphibolite to granulite facies environments. Known examples commonly attract debate about whether they formed at these high temperatures, or instead represent metamorphosed, metasomatic or superimposed (retrograde) mineralization.

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Fluid and metal sources in the Fäboliden hypozonal orogenic

The Fäboliden deposit is characterized by auriferous arsenopyrite-rich quartz veins, hosted by amphibolite facies supracrustal rocks and controlled by a roughly N-striking shear zone. Gold is closely associated with arsenopyrite-löllingite and stibnite, and commonly found in fractures and as inclusions in the arsenopyrite-löllingite grains.

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Amphibolite: Mineral information, data and localities

Amphibolite is a gneissose or granofelsic metamorphic rock mainly consisting of green, brown or black amphibole and plagioclase (including albite), which combined form ≥75% of the rock and both of which are present as major constituents; the amphibole constitutes ≥50% of the total mafic constituents and is present in an amount of ≥30%.

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Distribution of Gold and Sulfides

Table of ContentsControls of Gold and Sulfide Distribution at Lupin NWTRegional SettingGeologyDeformationPlutonismGeology of the

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PARAGENESIS AND COMPOSITION OF AMPHIBOLE AND BIOTITE IN THE

The Maclellan gold deposit is located approxi-mately 8 km northeast of Lynn Lake, Manitoba (Fig. I ), and is hosted by amphibolite-grade schists that form part of the Wasekwan Group of the Paleoproterozoic Lynn Lake greenstone belt (Gilbert et al. 1980, Fedikow 1986, Samson & Gagnon 1995). The deposit is one of three

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Gemstone Information - Amphibolite: Meaning and Properties

What does amphibolite mean?

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2635 Ma amphibolite facies gold mineralisation near a terrane boundary

2007. 10. 25. · The gold mineralisation occurred near the boundary between a crustal domain that experienced 2650–2600 Ma amphibolite facies polymetamorphism (including high pressure metamorphism at ca. 2650 Ma—Nutman and Friend, 2007) and another domain where affects of 2650–2600 Ma events was much weaker and generally absent.

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Is it possible to differentiate Ortho- and Para-amphibolites

The amphibolites mainly consist of tabular and prismatic hornblende and sub-rounded to well-rounded quartz set in a meager fine grained matrix of quartz, chlorite and sericite.

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Troilus Discovers New Gold Zone Located 8km Southwest of

Amphibolite is the main lithology hosting these gold and silver gold showings. This unit is highly deformed and strongly altered (silica, biotite, carbonate and ankerite). The amphibolite is commonly crosscut by smoky quartz veins and occasionally contains arsenopyrite. Intermediate to felsic units also contain gold.

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2635 Ma amphibolite facies gold mineralisation near a terrane

Gold on Storø (in the Nuuk region of southern West Greenland) occurs in a slice of strongly deformed, amphibolite facies, Neoarchaean quartzo-feldspathic metasedimentary rocks and amphibolites in tectonic contact with the Eoarchaean Færingehavn terrane and the Meso- to Neoarchaean Akia terrane. The gold is associated with either löllingite (FeAs) + arsenopyrite or pyrrhotite, which belong

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PDF) Occurrence of platinum group of minerals and gold in

in association with gold from amphibolite body will provide a new outlook for PGE exploration in the Betul Belt. Md. Atif Raza et al. / Indian Journal of Geosciences , 68 (2 & 3) : 297-302 302

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Golden Amphibolite

2020. 5. 29. · »Golden Amphibolite« entsteht durch die metamorphe Umwandlung von magmatischem Gabbro oder vulkanischem Basalt (Ortho-Amphibolit), bei Temperaturen von 500° - 700° C und einem Druck von 5 - 10 kbar (das entspricht einer Tiefe von etwa 15 bis 30 km). Solche Bedingungen treten in der Regionalmetamorphose von Gebirgsbildungsprozessen auf.

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Donnybrook Goldfield (Hunters Venture mine), Donnybrook

The gold distribution is highly irregular. At the Hunters Venture mine, veins are 1-2 metres wide down to 200 metres below the surface in gneiss and amphibolite. On top of the nearby hill is a 30 metre zone of silicified sandstone, containing numerous narrow quartz veins with gold throughout, but is sub-economic.

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In What Rock Formations Can Gold Be Found? | Sciencing

Gold is most often found in quartz rock. When quartz is found in gold bearings areas, it is possible that gold will be found as well. Quartz may be found as small stones in river beds or in large seams in hillsides. The white color of quartz makes it easy to spot in many

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Magnetic properties of rocks and minerals - ALASKA GOLD

2015. 10. 24. · amphibolite gneiss granulite phyllite quar•ite schist serpentine slate average metamorphic rocks Non-Iron-Bearing Minerals graphite C calcite CaCOa anhydrite CaSO4 gypsum CaSO•.2H•O ice H•O orthoclase KA1Si30 s magnesite MgCO3 forsterite Mg2SiO4 serpentinite Mg3Si2Os(OH), • halite NaC1 galena PbS quarlz SiO•

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Downieville, Gold Districts of California

Mining continued almost steadily until World War II, and intermittent prospecting and skin diving for gold continues. Geology. The district is underlain predominantly by north-trending beds of phyllite, slate and quartzite of the Calaveras Formation (Carboniferous to Permian). To the west are greenstone, amphibolite, and serpentine.

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