Results 151 to 160 of about 22,117 (186)
Some of the next articles are maybe not open access.
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
openaire +2 more sources
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
openaire +2 more sources
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
openaire +2 more sources
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
openaire +2 more sources
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
openaire +2 more sources
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
openaire +2 more sources
A regional study of mesothermal quartz vein hosted gold deposits in the Pine Creek geosyncline
, 1996 Andrew S. Wygralak
openaire +2 more sources
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
openaire +2 more sources
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
openaire +2 more sources
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
openaire +2 more sources
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
openaire +2 more sources
Economic Geology, 1993
The Francoeur 3 gold deposit, located approximately 15 km southwest of Rouyn-Noranda, Quebec, is one of several geologically similar Archean mesothermal gold deposits occurring along the Francoeur-Wasa shear zone, a second-order reverse structure possibly related to the Cadillac-Larder Lake break.The principal gold mineralization, which is completely ...
P. Pilote, J. F. Couture
openaire +2 more sources
The Francoeur 3 gold deposit, located approximately 15 km southwest of Rouyn-Noranda, Quebec, is one of several geologically similar Archean mesothermal gold deposits occurring along the Francoeur-Wasa shear zone, a second-order reverse structure possibly related to the Cadillac-Larder Lake break.The principal gold mineralization, which is completely ...
P. Pilote, J. F. Couture
openaire +2 more sources
Journal of African Earth Sciences, 2014
Abstract New Re–Os ages for early concordant veins and later discordant veins in the Ikalamovony sub-domain of west-central Madagascar require respectively a Paleoproterozoic age for metasedimentary rocks and a Pan-African age for the orogenic type occurrences. Indeed, this paper focuses on Re–Os geochronology of Dabolava gold occurrences, located in
Andre-Mayer, A. S. +5 more
openaire +4 more sources
Abstract New Re–Os ages for early concordant veins and later discordant veins in the Ikalamovony sub-domain of west-central Madagascar require respectively a Paleoproterozoic age for metasedimentary rocks and a Pan-African age for the orogenic type occurrences. Indeed, this paper focuses on Re–Os geochronology of Dabolava gold occurrences, located in
Andre-Mayer, A. S. +5 more
openaire +4 more sources
Journal of Southeast Asian Earth Sciences, 1990
Abstract Study of the Miocene Porgera intrusive rocks over 40 yr has generated at least four mutually contradictory classification schemes. These rocks are here reassessed, using a computer database of 256 analyses of volcanic and intrusive rocks of similar age from Papua New Guinea (PNG), and 100 analyses of the Porgera rocks themselves. The Porgera
N.M.S. Rock, E.J. Finlayson
openaire +2 more sources
Abstract Study of the Miocene Porgera intrusive rocks over 40 yr has generated at least four mutually contradictory classification schemes. These rocks are here reassessed, using a computer database of 256 analyses of volcanic and intrusive rocks of similar age from Papua New Guinea (PNG), and 100 analyses of the Porgera rocks themselves. The Porgera
N.M.S. Rock, E.J. Finlayson
openaire +2 more sources
Geology, 1999
Archean gold-bearing quartz vein systems constitute one of the most important classes of precious metal deposits; however, their origin remains controversial. Mantle, granitoid, meteoric water, and metamorphic related models do not resolve this controversy.
Robert Kerrich, Yiefei Jia
openaire +2 more sources
Archean gold-bearing quartz vein systems constitute one of the most important classes of precious metal deposits; however, their origin remains controversial. Mantle, granitoid, meteoric water, and metamorphic related models do not resolve this controversy.
Robert Kerrich, Yiefei Jia
openaire +2 more sources