Results 141 to 150 of about 22,117 (186)
Rapid dewatering of the crust deduced from ages of mesothermal gold deposits [PDF]
Nature, 1991 THE 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 ...
Richard J. Goldfarb +3 more
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Giant Mesothermal Gold Deposits
, 1993 D.A. Love, J.V. Hamilton, C.J. Hodgson
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Arabian Journal of Geosciences, 2019
The genesis of mesothermal Au-quartz vein deposits, which are among the more economically important type of Au deposits, is still under debate. There are two main theories, proposed in the literature, for the subsequent formation of these deposits in suitable structure involved: (1) Au-bearing ore fluid was derived from magmatic intrusions; or (2) Au ...
Jie Wu +6 more
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The genesis of mesothermal Au-quartz vein deposits, which are among the more economically important type of Au deposits, is still under debate. There are two main theories, proposed in the literature, for the subsequent formation of these deposits in suitable structure involved: (1) Au-bearing ore fluid was derived from magmatic intrusions; or (2) Au ...
Jie Wu +6 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
Derek A. Wyman, Robert Kerrich
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Geology of the Hammer Down mesothermal gold deposit, Newfoundland Appalachians, Canada
Canadian Journal of Earth Sciences, 1996The 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.
Marc R. Laflèche +3 more
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Applied Earth Science, 2004
AbstractAntimony and arsenic are commonly mobilised into the environment from mesothermal mineral deposits. Both these metalloids are potentially toxic in the environment when dissolved in water at low levels (
Paul M. Ashley +2 more
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AbstractAntimony and arsenic are commonly mobilised into the environment from mesothermal mineral deposits. Both these metalloids are potentially toxic in the environment when dissolved in water at low levels (
Paul M. Ashley +2 more
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Geology of Ore Deposits, 2016
The paper discusses factors in the deposition and concentration of native gold and the spatial distribution of its individuals within the sufide-poor gold–quartz veins at the mesoabyssal Tokur deposit. The major factors in deposition of gold were sealing of the hydrothermal system, a sudden drop in fluid pressure, and repeated immiscibility in the ...
N. S. Ostapenko, O. N. Neroda
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The paper discusses factors in the deposition and concentration of native gold and the spatial distribution of its individuals within the sufide-poor gold–quartz veins at the mesoabyssal Tokur deposit. The major factors in deposition of gold were sealing of the hydrothermal system, a sudden drop in fluid pressure, and repeated immiscibility in the ...
N. S. Ostapenko, O. N. Neroda
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Economic Geology, 1998
Characterization of gold in four Siberian mesothermal gold deposits was done through a multidisciplinary investigation (including ore microscopy, INAA, SIMS, EPMA, and 197 Au Moessbauer spectroscopy). The deposits are Olympiada and Veduga in the Enisei Mountain Range and Nezhdaninskoye and Sentachan in the Verkhoyansk-Kolyma area, in which vein and ...
F. E. Wagner +9 more
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Characterization of gold in four Siberian mesothermal gold deposits was done through a multidisciplinary investigation (including ore microscopy, INAA, SIMS, EPMA, and 197 Au Moessbauer spectroscopy). The deposits are Olympiada and Veduga in the Enisei Mountain Range and Nezhdaninskoye and Sentachan in the Verkhoyansk-Kolyma area, in which vein and ...
F. E. Wagner +9 more
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Fluid characteristics of vein and altered wall rock in Archean mesothermal gold deposits
Economic Geology, 1991Certain 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 ...
François Robert +4 more
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