Results 131 to 140 of about 22,117 (186)
The role of basic dykes in the formation of Zun-Holba gold deposit (Okinsky district, Siberia, Russia) [PDF]
, 2020 Sarsekeyeva, E. M. +1 more
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High-angle reverse faults, fluid-pressure cycling, and mesothermal gold-quartz deposits
Geology, 1988 Many mesothermal gold-quartz deposits are localized along high-angle reverse or reverse-oblique shear zones within greenstone belt terrains. Characteristically, these fault-hosted vein deposits exhibit a mixed "brittle-ductile" style of deformation (discrete shears and vein fractures as well as a schistose shear-zone fabric) developed under greenschist
Richard H. Sibson +2 more
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Economic Geology, 1988 Gold vein deposits of the Jungwon area are among the first documented examples of mesothermal gold deposition in the Republic of Korea. The deposits are composed of massive quartz veins up to 1.0 m wide which occupy fault planes in Precambrian gneiss. K-Ar dating of alteration sericite (146-156 m.y.) indicates a Late Jurassic age for ore mineralization,
Kevin L. Shelton +2 more
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Geologische Rundschau, 1990 There is general consensus that the majority of gold deposits in the important group hosted by volcanic or intrusive host rocks within Archaean granitoid-greenstone terrains have an epigenetic origin. However, there is controversy surrounding those stratabound deposits hosted by Fe-rich sedimentary rocks, such as banded iron formation (BIF), for which ...
Vearncombe, Julian R., Groves, David I.
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International Geology Review, 2006 Stable isotope analyses were carried out on sulfides from three mesothermal gold deposits of the Rio Itapicuru greenstone belt (Fazenda Brasileiro, Maria Preta, and Ambrosio mines) to constrain the source of the hydrothermal solutions. The ores are hosted in a volcanic-sedimentary sequence that evolved in an Archean cratonic area reworked during the ...
Mauro Cesar Geraldes +4 more
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Applied Geochemistry, 2012 Abstract This study investigates Sb speciation in sediments along the drainage of the Upper Peter adit at the Bralorne Au mine in southern British Columbia, Canada, and compares the behavior of Sb with that of As. The Upper Peter mineralization consists of native Au in quartz-carbonate veins with 1 wt.% sulfides dominated by pyrite and arsenopyrite ...
Y.T. John Kwong +6 more
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Mineralium Deposita, 1998 New Pb isotope data from three major mesothermal lode gold deposits (Ballarat West, Tarnagulla, Maldon) in central Victoria support a model whereby the metals derived from a large reservoir with a long residence time in the crust below the Palaeozoic Lachlan Fold Belt.
Frank P. Bierlein, Neal J. McNaughton
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Age constraints of the Wassa and Benso mesothermal gold deposits, Ashanti Belt, Ghana, West Africa
Journal of African Earth Sciences, 2015 Abstract The Ashanti Belt in Ghana hosts numerous multi-million ounce gold deposits and is one of the most richly gold endowed Paleoproterozoic belts of the West African Craton. This work shows that the Wassa mineralized intrusion is part of the Sefwi Group.
Luis A. Parra-Avila +5 more
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, 2005 The Asimotrypes carbonate-hosted mesothermal gold deposit, located at Eastern Macedonia, north Greece, geologically belongs to the West Rhodope massif, which represents the metamorphic core complex of an alpine collision orogen. The ore is of replacement and shear zone-controlled types.
Demetrios G. Eliopoulos +1 more
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