Economic geology : bulletin of the society of economic geologists, Vol. 107 N° 6. Economic geology and the bulletin of the society of economic geologists - Septembre/Octobre 2012
| Titre : | Economic geology : bulletin of the society of economic geologists, Vol. 107 N° 6. Economic geology and the bulletin of the society of economic geologists - Septembre/Octobre 2012 |
| Type de document : | Bulletin |
| Paru le : | 21/11/2012 |
Dépouillements
Article : texte imprimé
Stephen E. Box, Auteur ;
Arthur A. Bookstrom, Auteur ;
Robert G. Anderson, Auteur
|
The fill of the Mesoproterozoic Belt-Purcell Basin, which straddles the United States-Canada border within the Rocky Mountains of western North America (Fig. 1), consists of marine and nonmarine clastic and carbonate strata 15 to 20 km thick. Th[...]
Article : texte imprimé
Mineralogical and geochemical studies of strata-bound Fe-Co-Cu-Au-Bi-Y-rare-earth element (REE) deposits of the Idaho cobalt belt in east-central Idaho provide evidence of multistage epigenetic mineralization by magmatic-hydrothermal processes i[...]
Article : texte imprimé
Garth Graham, Auteur ;
Murray W. Hitzman, Auteur ;
Jerry Zieg, Auteur
|
The northern margin of the Helena Embayment contains extensive syngenetic to diagenetic massive pyrite horizons that extend over 25 km along the Volcano Valley-Buttress fault zone and extend up to 8 km basinward (south) within the Mesoproterozoi[...]
Article : texte imprimé
John N. Aleinikoff, Auteur ;
John F. Slack, Auteur ;
Karen Lund, Auteur
|
The Blackbird district, east-central Idaho, contains the largest known Co reserves in the United States. The origin of strata-hosted Co-Cu ± Au mineralization at Blackbird has been a matter of controversy for decades. In order to differentiate a[...]
Article : texte imprimé
K. Panneerselvam, Auteur ;
Andrew W. Macfarlane, Auteur ;
Vincent J.M. Salters, Auteur
|
Strata-bound cobalt-copper deposits occur in the metasedimentary rocks of the Apple Creek Formation (Mesoproterozoic) in a linear belt called the Idaho cobalt belt, near Salmon, Idaho. We report the first set of lead isotope measurements on sili[...]
Article : texte imprimé
Gary P. Landis, Auteur ;
Albert H. Hofstra, Auteur
|
The Idaho cobalt belt is a 60-km-long alignment of deposits composed of cobaltite, Co pyrite, chalcopyrite, and gold with anomalous Nb, Y, Be, and rare-earth elements (REEs) in a quartz-biotite-tourmaline gangue hosted in Mesoproterozoic metased[...]
Article : texte imprimé
Craig A. Johnson, Auteur ;
Arthur A. Bookstrom, Auteur ;
John F. Slack, Auteur
|
Cobalt-copper ± gold deposits of the Idaho cobalt belt, including the deposits of the Blackbird district, have been analyzed for their sulfur, carbon, hydrogen, and oxygen isotope compositions to improve the understanding of ore formation. Previ[...]
Article : texte imprimé
Timothy S. Hayes, Auteur ;
Gary P. Landis, Auteur ;
Joseph F. Whelan, Auteur
|
Ore formation at the Spar Lake red bed-associated strata-bound Cu deposit took place across a mixing and reaction zone between a hot oxidized metals-transporting brine and a reservoir of “sour” (H2S-bearing) natural gas trapped in the host sands[...]
Article : texte imprimé
John N. Aleinikoff, Auteur ;
Timothy S. Hayes, Auteur ;
Karl V. Evans, Auteur
|
Xenotime occurs as epitaxial overgrowths on detrital zircons in the Mesoproterozoic Revett Formation (Belt Supergroup) at the Spar Lake red bed-associated Cu-Ag deposit, western Montana. The deposit formed during diagenesis of Revett strata, whe[...]
Article : texte imprimé
Patrick Nadoll, Auteur ;
Jeffrey L. Mauk, Auteur ;
Timothy S. Hayes, Auteur
|
Magnetite (Fe3O4) is a common and widespread accessory mineral in many host rocks and mineral deposits. We used electron microprobe analysis (EMPA), laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) analysis, and oxygen iso[...]
Article : texte imprimé
M. Galicki, Auteur ;
D. Marshall, Auteur ;
R. Staples, Auteur
|
The Iron Range iron oxide ± Cu ± Au deposits in southeastern British Columbia comprise massive lenses and veins of hematite and martite with lesser magnetite in the Iron Range fault zone, which crosscuts the Proterozoic Aldridge Formation and Mo[...]
Article : texte imprimé
Jean-Philippe Paiement, Auteur ;
Georges Beaudoin, Auteur ;
Suzanne Paradis, Auteur
|
The Mesoproterozoic Purcell Basin in Canada contains three different types of veins: (1) type 1 Pb-Zn-Ag veins are composed of Fe-rich sphalerite, pyrrhotite, galena, freibergite, and pyrite with minor quartz gangue; (2) type 2 Pb-Ag-Cu-Au veins[...]
Article : texte imprimé
Frank C. Ramos, Auteur ;
Philip E. Rosenberg, Auteur
|
Sm-Nd, Pb, and Sr isotope and rare-earth element (REE) analyses of quartz-carbonate veins associated with the Coeur d’Alene mining district, Idaho and western Montana, constrain the age and origin of Coeur d’Alene veining. An Sm-Nd isochron age [...]
Exemplaires(0)
| Disponibilité | ||||
|---|---|---|---|---|
| aucun exemplaire | ||||
