|
|
|
|
|
Olive L. Ponyalou, Michael G. Petterson and Joseph O. Espi
Feni is located at the southeastern end of the NW-trending Tabar?Lihir?Tanga?Feni (TLTF) volcanic island chain, in northeastern Papua New Guinea. This island chain is renowned for hosting alkaline volcanics, geothermal activity, copper?gold mineralizatio...
ver más
|
|
|
|
|
|
|
|
|
|
|
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 ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Michael W. Förster, Yannick Bussweiler, Dejan Prelevic, Nathan R. Daczko, Stephan Buhre, Regina Mertz-Kraus and Stephen F. Foley
Subduction of oceanic crust buries an average thickness of 300?500 m of sediment that eventually dehydrates or partially melts. Progressive release of fluid/melt metasomatizes the fore-arc mantle, forming serpentinite at low temperatures and phlogopite-b...
ver más
|
|
|
|
|
|
|
|
|
|
|
Vittorio Scribano and Serafina Carbone
Geochemical characteristics of middle ocean ridge basalts (MORBs) testify partial melting of spinel-peridotite mixed with a few amounts of garnet-pyroxenite. The latter can be considered either autochthonous products of the crystallization of partial mel...
ver más
|
|
|
|
|
|
|
|
|
|
|
Evgeniy Kozlov, Ekaterina Fomina, Mikhail Sidorov and Vladimir Shilovskikh
This article is devoted to the geology of titanium-rich varieties of the Petyayan-Vara rare-earth dolomitic carbonatites in Vuoriyarvi, Northwest Russia. Analogues of these varieties are present in many carbonatite complexes. The aim of this study was to...
ver más
|
|
|
|
|
|
|
|
|
|
|
George L. Guice, Iain McDonald, Hannah S. R. Hughes, Denis M. Schlatter, Kathryn M. Goodenough, John M. MacDonald and John W. Faithfull
The relative depletion of high field strength elements (HFSE), such as Nb, Ta and Ti, on normalised trace-element plots is a geochemical proxy routinely used to fingerprint magmatic processes linked to Phanerozoic subduction. This proxy has increasingly ...
ver más
|
|
|
|
|
|
|
|
|
|
|
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...
ver más
|
|
|
|
|
|
|
|
|
|
|
Daniela Welkner,Estanislao Godoy,Heinz-J Bernhardt
Pág. 3 - 15
The Late Cretaceous Del Salto Pluton is one of the four Late Jurassic to Late Miocene intrusives that are recognized ca. 60 km inboard from the eastern limit of the Patagonian Batholith, close to the Chilean-Argentinian border. The pluton is a fluorite-b...
ver más
|
|
|
|
|
|
|
|
|
|
|
Waldo Vivallo,Sergio Espinoza,Fernando Henriquez
Pág. 75 - 88
ABSTRACT. Metasomatism and hydrothermal alteration in the Cerro Negro Norte iron ore district, Copiapo, Chile. The magnetite-apatite ores in the Cerro Negro Norte iron district, Copiapo, are hosted by hydrothermally altered andesitic volcanic rocks. As a...
ver más
|
|
|
|
|
|
|
|
|
|
|
Colombo C.G. Tassinari,Francisco Munizaga,Ruben Ramirez
Pág. 193 - 205
ABSTRACT. Rb-Sr isotopic age and geochemistry of The Mantos Blancos copper deposit: temporal relation of the Jurassic magmatism. The Mantos Blancos volcanic sequence, host of the stratabound Cu (-Ag) deposit of the same name, has been studied for its Rb-...
ver más
|
|
|
|
|
|