Results 111 to 120 of about 1,650 (170)
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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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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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Journal of Geochemical Exploration, 1990
Abstract Case studies in the Wabigoon and Uchi Archaean greenstone belts of Canada demonstrate that the liquid CO 2 -bearing fluid inclusions, which are diagnostic of mesothermal gold-quartz-carbonate-sulphide deposits, may be reliably and reproducibly detected in the field by crushing-stage analysis.
Daniel D. Marshall, Larryn W. Diamond
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Abstract Case studies in the Wabigoon and Uchi Archaean greenstone belts of Canada demonstrate that the liquid CO 2 -bearing fluid inclusions, which are diagnostic of mesothermal gold-quartz-carbonate-sulphide deposits, may be reliably and reproducibly detected in the field by crushing-stage analysis.
Daniel D. Marshall, Larryn W. Diamond
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Economic Geology, 1991
Gold quartz veins at the Bralorne mesothermal vein deposit have extensive quartz-ankeritic carbonate-muscovite hydrothermal alteration envelopes that grade outward to chlorite-calcite-albite. Minor pyrite with traces of sphalerite, galena, and tetrahedrite are found in the veins with native gold; more abundant pyrite and arsenopyrite, with lesser ...
C. I. Godwin +3 more
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Gold quartz veins at the Bralorne mesothermal vein deposit have extensive quartz-ankeritic carbonate-muscovite hydrothermal alteration envelopes that grade outward to chlorite-calcite-albite. Minor pyrite with traces of sphalerite, galena, and tetrahedrite are found in the veins with native gold; more abundant pyrite and arsenopyrite, with lesser ...
C. I. Godwin +3 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
G. N. Gamynin +4 more
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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
G. N. Gamynin +4 more
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Economic Geology, 1996
Gold mineralization, in the Flambeau Lake area, is found in and adjacent to quartz-carbonate-albite veins surrounded by halos of intense ankerite-albite alteration. These features are the result of the passage of hydrothermal fluid through tension fractures and shear zones developed in response to regional dextral shearing.
Anthony E. Williams-Jones +1 more
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Gold mineralization, in the Flambeau Lake area, is found in and adjacent to quartz-carbonate-albite veins surrounded by halos of intense ankerite-albite alteration. These features are the result of the passage of hydrothermal fluid through tension fractures and shear zones developed in response to regional dextral shearing.
Anthony E. Williams-Jones +1 more
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International Geology Review, 1994
The Prestea lode gold deposit occurs in a graphitic shear zone in the Birimian system of Ghana. The Birimian is an Early Proterozoic greenstone assemblage (≈ 2100 Ma) with large gold deposits, consisting of a lower unit predominantly of metasediments and an upper unit of metavolcanics with interbedded sediments.
Napoleon Q. Hammond, Hidehiko Shimazaki
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The Prestea lode gold deposit occurs in a graphitic shear zone in the Birimian system of Ghana. The Birimian is an Early Proterozoic greenstone assemblage (≈ 2100 Ma) with large gold deposits, consisting of a lower unit predominantly of metasediments and an upper unit of metavolcanics with interbedded sediments.
Napoleon Q. Hammond, Hidehiko Shimazaki
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