Results 111 to 120 of about 1,709 (175)
Giant Mesothermal Gold Deposits
, 1993 Chris Hodgson, D.A. Love, J.V. Hamilton
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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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Geology of the Hammer Down mesothermal gold deposit, Newfoundland Appalachians, Canada
Canadian Journal of Earth Sciences, 1996 The Hammer Down gold deposit is one of the most significant mesothermal vein-type gold deposits in the Canadian Appalachians. It is located within a complex sequence of Ordovician, mafic-dominated tholeiitic and calc-alkalic and arc-related volcanic rocks, which was intruded by Silurian felsic porphyry dykes.
Damien Gaboury +3 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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Can lamprophyres resolve the genetic controversy over mesothermal gold deposits?
Geology, 1988Associations between calc-alkaline lamprophyres and mesothermal gold deposits (Archean to Tertiary) in which the lamprophyres are coeval (as well as cospatial) with mineralization are increasingly recognized worldwide. Our suggested hypothesis regards lamprophyres as transporting agents for Au from Au-rich sources in the deep mantle, which then undergo
Nicholas M.S. Rock, David I. Groves
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Geodynamic setting of mesothermal gold deposits: An association with accretionary tectonic regimes
Geology, 1990Mesothermal gold provinces of Phanerozoic age are characteristically associated with regional structures along which allochthonous terranes have been accreted onto continental margins or arcs. A recurring sequence of transpressive deformation, uplift, late kinematic mineralization, and shoshonitic magmatism is consistent with thermal reequilibration of
Robert Kerrich, Derek Wyman
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Fluid characteristics of vein and altered wall rock in Archean mesothermal gold deposits
Economic Geology, 1991 Certain trends in alteration are commonly observed near Archean mesothermal gold deposits. This study was designed to monitor the changes in composition of fluid inclusions using solid probe mass spectrometry by: (1) establishing and verifying systematic changes in the composition of the fluid during fluid-rock interaction, (2) characterizing the ...
Jayanta Guha +4 more
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Geology of Ore Deposits, 2010 New mineralogical, thermobarometric, isotopic, and geochemical data provide evidence for long and complex formation history of the Sarylakh and Sentachan Au-Sb deposits conditioned by regional geodynamics and various types of ore mineralization, differing in age and source of ore matter combined in the same ore-localizing structural units. The deposits
Н. С. Бортников +4 more
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Rapid dewatering of the crust deduced from ages of mesothermal gold deposits
Nature, 1991THE large-scale migration of fluids through the continental crust has been well documented, but there is no consensus regarding the timing of fluid migration relative to orogenic episodes, or rates of crustal dewatering1. Here we present40Ar/39Ar dates for muscovites from quartz veins along a major shear zone in southeast Alaska, which show that the ...
R. J. Goldfarb +3 more
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A regional study of mesothermal quartz vein hosted gold deposits in the Pine Creek geosyncline
, 1996 Andrew S. Wygralak, Andrew S. Wygralak
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