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of 13
pro vyhledávání: '"39"'
Publikováno v:
Economic Geology. 112:347-374
La Bodega and La Mascota are Plio-Pleistocene high- to intermediate-sulfidation epithermal gold deposits hosted in Proterozoic gneisses and Mesozoic granites of the Santander massif, eastern Cordillera of Colombia and are part of the California-Vetas
Autor:
Mathieu Leisen, Martin Reich, Fernando Barra, Tristan M. Childress, J. Tomás Ovalle, Nikita L. La Cruz, Brian A. Konecke, Adam C. Simon
Publikováno v:
Economic Geology. 115:1461-1491
The textures of outcrop and near-surface exposures of the massive magnetite orebodies (>90 vol % magnetite) at the Plio-Pleistocene El Laco iron oxide-apatite (IOA) deposit in northern Chile are similar to basaltic lava flows and have compositions th
Autor:
Mark D. Hannington, Thomas Monecke, JB Gemmell, Harald Strauss, Sven Petersen, Klas Lackschewitz, Reinhard Kleeberg, Marc Peters, Harold L. Gibson, Nico Augustin, R. Sharpe, Anne Westhues
Publikováno v:
Economic Geology. 109:2129-2158
A subseafloor replacement-style barite and sulfide occurrence was drilled in shallow waters at the Palinuro volcanic complex, the northernmost Aeolian arc volcano in the Tyrrhenian Sea, Italy. Using a lander-type drilling device, 11 successful drill
Publikováno v:
Economic Geology. 102:717-738
The Neoproterozoic Bisha volcanic-associated massive sulfide deposit (VMS) is a large (>39 million metric tons (Mt)) relatively high grade Zn-Cu-Au-Ag deposit in a newly discovered VMS district in western Eritrea. The host stratigraphic section compr
Publikováno v:
Economic Geology. 99:257-277
The Rum Jungle mineral field, Northern Territory, Australia, forms part of the Paleoproterozoic Pine Creek orogen. The geology of the area comprises two Archean granitic basement domes, overlain by a Paleoproterozoic sequence of metasedimentary and s
Autor:
Erik B. Melchiorre, M. Stephen Enders
Publikováno v:
Economic Geology. 98:607-621
Stable isotope analyses were performed on 39 copper carbonate samples from the Las Terrazas fault zone of the Northwest Extension copper oxide deposit, Morenci district, Arizona. The δ 18 O values of azurite (23.3–25.5‰, SMOW) and malachite (21.
Publikováno v:
Economic Geology. 96:1455-1459
We report Re-Os isotope ages that are the first for sulfides closely associated with gold mineralization at the Bendigo and Maldon goldfields in central Victoria. Two arsenopyrite samples from Bendigo contain 11 ppb Re and 0.08 ppb highly radiogenic
Autor:
Jean S. Cline
Publikováno v:
Economic Geology. 96:75-89
Pregold mineralization at the Getchell Carlin-type gold deposit includes quartz and base metal vein mineralization associated with intrusion of a Cretaceous granodiorite stock. The veins contain minor pyrite and trace chalcopyrite, arsenopyrite, gale
Publikováno v:
Economic Geology. 91:1239-1262
The West Gore Sb-Au deposit is anomalous in the Megurea terrane of Nova Scotia because of its enrichment in Sb, a metal that is essentially absent from other Megurea gold deposits. The deposit is hosted by graphitic and sulfide-bearing slates of the
Autor:
Daniel J. Kontak, Robert Kerrich
Publikováno v:
Economic Geology. 90:885-901
The Beaver Dam gold deposit is located within metaturbidites of the lower Paleozoic Megurea Group of southern Nova Scotia, part of the Meguma terrane of the Canadian Appalachians which records a mid-Devonian metamorphic and deformational history. The