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Andrea R. Biedermann
Empirical relationships between magnetic fabrics and deformation have long served as a fast and efficient way to interpret rock textures. Understanding the single crystal magnetic properties of all minerals that contribute to the magnetic anisotropy of a...
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Zsolt Benkó, Aberra Mogessie, Ferenc Molnár, Steven A. Hauck, Mark J. Severson and Karl Ettinger
In the contact metamorphic aureole of the Duluth Complex, Cu-Ni-PGE mineralization occurs locally up to 100 m from the intrusion-footwall contact (Spruce Road area), whereas elsewhere (Dunka Pit deposit) the footwall granite and metapelite (Serpentine de...
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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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Arshad Ali, Iffat Jabeen, Sobhi J. Nasir and Neil R. Banerjee
We report the equilibration temperatures derived from the oxygen isotope thermometry of pyroxene-olivine pair from the Dar al Ghani (DaG) 476 (1200 +105/-90 °C) and Sayh al Uhaymir (SaU) 008 (1430 +220/-155 °C) meteorites showing a difference of over 200...
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Arshad Ali, Iffat Jabeen, Sobhi J. Nasir and Neil R. Banerjee
We report the equilibration temperatures derived from the oxygen isotope thermometry of pyroxene-olivine pair from the Dar al Ghani (DaG) 476 (1200 +105/-90 °C) and Sayh al Uhaymir (SaU) 008 (1430 +220/-155 °C) meteorites showing a difference of over 200...
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Stefan Richter,Jens Götze,Hans Niemeyer,Robert Möckel
Pág. 386 - 396
In the present study a first found of agates in Chile is reported from the Cordón de Lila region in northern Chile. The agates occur as veins and lenses in altered Permian volcanic rocks. The rock composition is rhyodacitic/ dacitic consisting of a fine-...
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Jose A. Naranjo,Fernando Henrquez,Jan O. Nystrom
Pág. 110 - 120
Studies of drill cores from the Pasos Blancos area at El Laco in the central Andes, northern Chile, give evidence of an intense and extensive subvolcanic contact-metasomatic process. This process resulted from shallow-level emplacement of very volatile-r...
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Natalia Villalba,Hugo Murcia,Edith Jerez,Daniel Piedrahita,Dayana Schonwalder-Ángel,Andrés Pardo-Trujillo,Sebastián Echeverri
Pág. 181 - 200
The Combia Volcanic Province (~11-5 Ma), is a volcaniclastic sequence located in northwest Colombia between the Central and Western cordilleras at 5-6° N latitude. Its source is associated with the volcanic activity of the magmatic arc produced by the su...
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Jorge Skarmeta
Pág. 393 - 413
Cataclastic and mylonitic rocks exposed in the southwestern part of the Peninsula de Mejillones, northern Chile, are intruded at high angles of the foliation by younger, steeply inclined (±70°) basaltic dykes that resemble intru¬sive tension gashes with ...
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Salvador M. Harambour
Pág. 173 - 179
RESUMEN. Se da a conocer el descubrimiento de un aparato volcanico de edad pleistocena a reciente, al que se propone denominar Reclus, en la cuenca de alimentacion del glaciar Amalia, vertiente occidental del Hielo Patagonico Sur, 50°57'50"S; 73°35'W. Co...
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Estanislao Godoy,Werner Loske
Pág. 119 - 127
RESUMEN. Tres fracciones granulometricas de circones en una diorita de dos piroxenos (charnoquita 'precambrica' segun estudios anteriores), que aflora en Laguna Verde, y dos fracciones de su equivalente neisico de Punta Curaumilla, indicaron edades conco...
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Alvaro Puig,Sergio Diaz,Lucia Cuitino
Pág. 57 - 82
Resumen. Los yacimientos epitermales El Guanaco (Au, Cu), Cachinal de La Sierra (Ag) y El Soldado (Ag), ubicados entre 24°52'-25°06' y 69°32'W, estan geneticamente relacionados con un sistema de calderas anidadas del Paleoceno-Eoceno Inferior. Las rocas ...
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Sabrina Nazzareni, Simona Alunno, Federica Zaccarini, Michele Mattioli, Alessandro Murroni, Alessandro Di Michele and Alberto Renzulli
The Murcielago gold placer is located in the Lepaguare Valley, Olancho Department (Central Honduras). The placer mineralogy includes silicates (quartz, garnets, amphibole, Ca-pyroxene, micas, epidote, and tourmaline); calcite; and in the heavy fraction, ...
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Jorge Eduardo Bustillos A., Jorge Eduardo Romero, Alicia Guevara C., Juan Díaz-Alvarado
Pág. 47 - 77
The Tungurahua volcano (Northern Andean Volcanic Zone) has been erupting since 1999, with at least
four eruptive phases up to present. Although a dozen of research focuses in tephra fall deposits during this period, none
of them cover the full eruptive c...
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