Buscar
Mostrando ítems 1-10 de 27
The temporal evolution of back-arc magmas from the Auca Mahuida shield volcano (Payenia Volcanic Province, Argentina)
(Elsevier Science, 2016-09)
In order to better constrain the temporal volcanic activity of the back-arc context in Payenia Volcanic Province (PVP, Argentina),we present newK?Ar dating, petrographic data,major and trace elements from23 samples collected ...
Geochemical constraints on the petrogenesis of Triassic alkaline basalts of Sierra de Valle Fértil, Western Sierras Pampeanas, Argentina: implications for their origin, evolution and tectonic setting
(Pergamon-Elsevier Science Ltd, 2019-11)
The first geochemical and Sr-Nd isotope data of a series of Triassic basaltic rocks from Sierra de Valle Fértil, Western Sierras Pampeanas, Argentina, are herein presented. The mafic rocks are the result of continental ...
As rochas vulcânicas da Ilha São Jorge, Açores (Portugal) : petrografia e geoquímica
(Pós-Graduação em Geociências e Análise de BaciasUFS, 2019)
Basic magmatism in northeastern Puna, Argentina: Chemical composition and tectonic setting in the Ordovician back-arc
(Pergamon-Elsevier Science Ltd, 2009-12)
Two main groups of basic rocks, representative of the bimodal Ordovician magmatism of the northeastern Puna (22-24°S, 66°30'-65°40'W) were revisited on the basis of new geological, petrographic and geochemical data. One ...
The Farallon-Aluk ridge collision with South America: Implications for the geochemical changes of slab window magmas from fore- to back-arc
(Elsevier, 2013-07)
The collision of a divergent ocean ridge may evolve into two end cases: in the continuity of ocean-floor subduction, or in the detachment of the subducted plate. The northern Patagonia active plate margin has the unique ...
Petrogenesis of Cenozoic volcanic rocks in the NW sector of the Gharyan volcanic field, Libya
(ELSEVIER SCIENCE BVAMSTERDAM, 2012)
The north-western sector of the Gharyan volcanic field (northern Libya) consists of trachytic-phonolitic domes emplaced between similar to 41 and 38 Ma, and small-volume mafic alkaline volcanic centres (basanites, tephrites. ...
Edad y naturaleza del magmatismo básico eoceno de los alrededores de la Meseta del CanquelAge and nature of the Eocene basic magmatism of the Canquel Plateau
(Asociación Geológica Argentina, 2017-06)
En el norte de la meseta de Canquel, entre Paso de Indios y Las Plumas, afloran cuerpos intrusivos y restos de coladas de composiciónbásica alcalina cuyas dataciones previas abarcan un lapso comprendido entre 40 y 52 Ma. ...
Subduction Zone Mantle Enrichment by Fluids and Zr-Hf-depleted Crustal Melts as Indicated by Backarc Basalts of the Southern Volcanic Zone, Argentina
(Elsevier Science, 2016-10)
We aim to identify the components metasomatizing the mantle above the subducting Nazca plate under part of the Andean Southern Volcanic Zone (SVZ). We present new major and ICP-MS trace element and Sr, Nd and high-precision ...