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María Josefina Pons,Juan Mendiberri,Martín Arce,Gerson Alan Greco,Telma B. Musso,María Lis Fernández,Natalia Hauser,Pamela Aparicio González
Pág. 93 - 126
The Sofía-Julia-Valencia vein system, located in the Andacollo mining district in central west Argentina, is hosted by ENE-WSW oriented strike-slip faults which are the result of reactivation of normal faults affecting Carboniferous to Jurassic rocks dur...
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Chiara Elmi, Jacob R. Whitlock, Matthew T. Macdowell and Richard D. Foust, Jr.
Many regions of the United States contain manganese deposits economically valuable in New England, Appalachian, and Piedmont regions in the Eastern United States, in Northern Arkansas, and, to a small extent, in Central?Western California. Mn oxide/hydro...
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Olga D. Mokrushina, Julia A. Mikhailova and Yakov A. Pakhomovsky
The 360?370 Ma old Lovozero massif (NW Russia) is a layered nepheline syenitic-foidolitic pluton. Despite its huge size (650 km2), the massif is surrounded by a narrow fenite aureole, and the most intensive fenitization is associated with pegmatites and ...
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Jorge E. Morales Leal,Andrew Menzies,Hans-G. Wilke,José Zuluaga
Pág. 185 - 207
The El Peñón low-sulfidation epithermal deposit, located in the Paleocene metallogenic belt in the Antofagasta region, northern Chile, consists of Au-Ag bearing veins and hydrothermal breccias hosted in volcanic rocks and surrounded by alteration haloes ...
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María José J. Espeche,Raúl Lira,Nicolás A. Viñas
Pág. 14 - 45
On-going mining operations in a marble quarry (Cantera Centro) from Malagueño, Sierra Chica de Córdoba, Argentina, have unearthed veins, veinlets and lenses of sulfides (pyrrhotite>pyrite?chalcopyrite>>sphalerite). These veins and lenses are up ...
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Nadia Mohammadi, Christopher R. M. McFarlane and David R. Lentz
A combination of in situ laser ablation inductively coupled plasma?mass spectrometry (LA ICP?MS) analyses guided by Scanning Electron Microscope?Back-Scattered Electron imaging (SEM?BSE) was applied to hydrothermal monazite from greisen veins of the Late...
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Alessandra Correale, Vittorio Scribano and Antonio Paonita
Ultramafic magmas (MgO = 18 wt%) are generally thought to be primary mantle melts formed at temperatures in excess of 1600 °C. Volatile contents are expected to be low, and accordingly, high-Mg magmas generally do not yield large explosive eruptions. How...
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Nathan A. Forsythe, Paul G. Spry and Michael L. Thompson
The Navilawa caldera is the remnant of a shoshonitic volcano on Viti Levu, Fiji, and sits adjacent to the low-sulfidation Tuvatu epithermal Au?Te deposit. The caldera occurs along the Viti Levu lineament, approximately 50 km SW of the Tavua caldera, whic...
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Patrick Nadoll, Meike Rehm, Florian Duschl, Reiner Klemd, Dennis Kraemer and Marta Sosnicka
Hydrothermal fluorites from Paleozoic sedimentary rocks and volcanic units in the North German Basin (NGB) have been investigated to create a petrographic and geochemical inventory—with particular focus on strategic elements such as rare earth elem...
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Marina M. S. Cabral Pinto, Maria M. V. G. Silva, Ana M. R. Neiva, Fernanda Guimarães and Paulo B. Silva
In this work, in order to study the release, migration, sorption, and (re)precipitation of uranium (U) during alteration under oxidizing conditions, we carried out a systematic study using scanning electron microscopy, X-ray maps, and electron microprobe...
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