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·Archean biotite plagioclase gneiss hornblende plagioclase gneiss and subordinate marble that are assigned to the Jianping Group host the Anjiayingzi gold deposit and the elliptical medium to coarse grained Jiguanzi Quartz Monzonite which is also called the Anjiayingzi Granite Fig 2 a The monzonite is grey to pink in colour and consists of
·Gold at the Glenburgh deposit is free and disseminated within quartz biotite garnet gneiss amphibolite and post gold quartz chlorite veins No clear association with a specific host
·Deposit geochemistry and fluid chemistry show that gold deposits in amphibolite/granulite facies terranes are high temperature analogues of mesothermal deposits The metamorphic grade during mineralisation influenced the structural style host rocks and siting of
·The Qussuk gold occurrence illustrates that epithermal gold deposits existed at the Archean and that they can be preserved up to upper amphibolite metamorphic conditions further highlighting the
·The factors that cause the alteration complications and variations in orogenic gold system mainly include 1 orogenic gold deposits form in much more varied crustal depths relative to other gold deposits Groves et al 1998; Wang et al 2021 ; 2 the disseminated and quartz vein orogenic gold systems formed under different fluid/rock
·The Weizigou gold deposit is located in the western Jiamusi Massif Northeast China Gold mineralization is hosted in the amphibolite which intruded the granitic gneiss
· The importance of rock volumes and the method to estimate percentages Other than collisional orogens with subhorizontal nappes or continental arcs composed of complex spheroidal batholiths cratonized subduction accretion complexes create a steeply structured crust consisting of intercalated sheets of paragneisses orthogneisses migmatites
·The Jiaodong gold province located in the Jiaodong Peninsula east of the North China Craton NCC is one of the largest provinces of granitoid hosted lode gold deposits in the world Qiu et al 2002 More than 100 gold deposits with measured gold reserves exceeding 4000 t have been discovered in this province making it become the most important Au producers in
The timing of mineralization at the Hemlo gold deposit has long been a controversial issue We present arguments that use partial melting of the An Example of Melting and Mobilization of a Precious Metal Sulfosalt Assemblage during Amphibolite Facies Metamorphism and Deformation Andrew G Tomkins; Andrew G Tomkins Department of Geology and
·The nearby presence of deformation zones with overprinting events and previously dated intrusive rocks make the Tuanshanbei deposit an ideal target to investigate the genetic relationship between gold mineralization deformation and magmatism Figs 1 3 The exploration at Tuanshanbei started in the 1980s and reserves of t gold were initially
·We reinterpret the regional geologic setting of the giant Muruntau gold deposit and report new 40 Ar/ 39 Ar isotope age determinations and a laser Raman microprobe analysis of fluid inclusions New 40 Ar/ 39 Ar isotope age determinations of hydrothermal sericite selvages to gold stage quartz veins are in excellent agreement with older Rb Sr dates on auriferous
·Download Citation The Hemlo Gold Deposit Ontario An Example of Melting and Mobilization of a Precious Metal Sulfosalt Assemblage during Amphibolite Facies Metamorphism and Deformation The
·Semantic Scholar extracted view of "Metamorphic and structural setting of Archaean amphibolitehosted gold deposits near Southern Cross Southern Cross province Yilgarn Block Western Australia" by E Bloem et al The ore deposits of The Granites goldfield are shear hosted within Palaeoproterozoic amphibolite facies metasedimentary rocks in
·The main characteristics of the gold mineralization in the area appear to indicate hydrothermal mineralization in connection with shear zones This study allows us to predict that quartz veins in the amphibolite can be mined at a profit and a detailed geochemical and resource valuation needs to be carried out for the Au and associated Galena
·Geochronological and sulfide geochemical evidence for gold mineralization related to post collisional magmatism in the Wulonggou goldfield of the East Kunlun Orogen northern Tibet is composed of gneiss schist amphibolite and granulite with lenticular marble The Mesoproterozoic Xiaomiao Formation in the southwest of the area consists of
·underwent epidote amphibolite or amphibolite facies regional metamorphism for a long time was consid ered exclusively as promising for mining placer gold However in the second half of 1980s special pros pecting and prospecting appraisal works in the MOC headed by Ivanov discovered the Ykan and
·The Southern Cross Archaean greenstone belt comprises dominantly low to mid amphibolite facies high strain domains which show evidence of a complex deformational and metamorphic history as a major conduit for ore fluids at a depth of about 12 14 km ∼3 kbars lithostatic pressure in the crust Gold mineralisation along the
·The gold mineral systems of the West Qinling orogen central China New insight from the Baguamiao gold deposit Author links open overlay panel Hui Dong Yu a underlying by Neoarchean to Paleoproterozoic basement of gneiss and amphibolite Meso to Neoproterozoic sedimentary and volcanic sequences
Metamorphic grade within the study area varies from greenschist facies biotite subfacies to amphibolite facies kyanite subfacies Locally rocks in the study area exhibit slight effects of retrograde metamorphism Gold was mined intermittently from 77 mines and prospects from about 1830 to about 1935
·Many workers accept a metamorphic model for orogenic gold ore formation where a gold bearing aqueous carbonic fluid is an inherent product of devolatilization across the greenschist amphibolite
·A A Mohammed et al DOI / 181 Journal of Geoscience and Environment Protection 1 Introduction The use of gold as an ornament and as money makes it a precious metal with the
·Amphibolite Amphibolite is a coarse grained metamorphic rock predominantly composed of mineral amphibole and plagioclase can also contain minor amounts of other metamorphic minerals such as biotite epidote garnet wollastonite andalusite staurolite kyanite and is found around metamorphic and igneous rock intrusions
