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作者:Giorgio Rivalenti , Maurizio Mazzucchelli ...
来源:[J].LITHOS(IF 3.779), 2007, Vol.99 (1), pp.45-67
摘要:Abstract(#br)The alkali basalts of the Cerro de los Chenques quaternary backarc volcano (200 km E of the volcanic arc) carry to the surface abundant spinel-facies mantle xenoliths (lherzolites, harzburgites and dunites). The clinopyroxene geochemistry indicates that the pris...
作者:Giorgio Rivalenti , Riccardo Vannucci ...
来源:[J].Earth and Planetary Science Letters(IF 4.349), 1996, Vol.139 (3), pp.423-437
摘要:Abstract(#br)Comparison of 360 trace element analyses of clinopyroxenes from peridotites indicates that clinopyroxene composition cannot discriminate between suboceanic and subcontinental mantle. Clinopyroxenes from abyssal and fore-arc peridotites have the lowest incompatible el...
作者:Giorgio Rivalenti , Ciro T. Correia ...
来源:[J].Journal of South American Earth Sciences(IF 1.533), 2007, Vol.25 (3), pp.298-312
摘要:Abstract(#br)The Niquelândia complex is a Neoproterozoic mafic-ultramafic intrusion resulting from fractional crystallization of primary picritic basalt intrusions. It consists of two layered sequences: a lower and larger one (LS), where four stratigraphic units exhibit an u...
作者:Giorgio Rivalenti , Maurizio Mazzucchelli ...
来源:[J].Journal of South American Earth Sciences(IF 1.533), 2004, Vol.17 (2), pp.121-152
摘要:Abstract(#br)The backarc Patagonia mantle underwent pervasive regional re-crystallisation that left only remnants of the pre-existing mantle. Anhydrous xenoliths (dominantly lherzolites and harzburgites, few dunites) are predominant. Xenoliths containing hydrous phases (lherzolit...
作者:Giorgio Rivalenti , Maurizio Mazzucchelli ...
来源:[J].LITHOS(IF 3.779), 1998, Vol.43 (4), pp.235-265
摘要:Abstract(#br)Paleoproterozoic basaltic, andesitic and rhyolitic dykes crosscut the Archaean Carajás basement. Basalts are distinguished into a high and a low TiO 2 group (HTi and LTi), each group consisting of geochemically distinct NE- and NW-trending swarms. The HTi dykes ...
作者:Giorgio Rivalenti , Alberto Zanetti ...
来源:[J].LITHOS(IF 3.779), 2006, Vol.94 (1), pp.111-131
摘要:Abstract(#br)New xenolith occurrences in the Cenozoic alkali basalts of north-eastern Brazil have been studied in order to constrain the possible imprint on the continental mantle lithosphere of its passage over the Fernando de Noronha plume and the regional mantle processes...
作者:Giorgio Rivalenti , Riccardo Vannucci ...
来源:[J].LITHOS(IF 3.779), 2010, Vol.119 (3), pp.485-500
摘要:Abstract(#br)Trace element and isotopic data obtained for mantle spinel lherzolites and diorite dykes from the Baldissero massif (Ivrea–Verbano Zone, Western Italy) provide new, valuable constraints on the petrologic and geodynamic evolution of the Southern Alps in Paleozoic...
作者:... Albrecht W. Hofmann , Maurizio Mazzucchelli , Giorgio Rivalenti
来源:[J].Chemical Geology(IF 3.154), 1997, Vol.140 (3), pp.223-235
摘要:Abstract(#br)Whole-rock Nd and Sr isotopic compositions of the mafic-ultramafic complex near Finero demonstrate that the magma was derived from a depleted, perhaps MORB-type mantle reservoir. The Sm-Nd data for the Amphibole Peridotite unit can be interpreted as an isochron ...
作者:... Claudia E Cavarozzi , Eduardo Llambias , Giorgio Rivalenti
来源:[J].Journal of South American Earth Sciences(IF 1.533), 2003, Vol.16 (3), pp.91-103
摘要:Abstract(#br)The Andesitas Alvar Formation is part of the large Jurassic volcanic province of Patagonia (southern South America) that, in Jurassic time, participated in the disassembling of Gondwana in a tensional–transtensional regime with large-scale half-grabens. This lar...
作者:Giorgio Rivalenti , Ricardo Varela ...
来源:[J].Tectonophysics(IF 2.684), 2011, Vol.509 (3), pp.218-237
摘要:Abstract(#br)The southern and central Andes reflect significant along-strike differences of tectonic activity, including shortening, alternating flat-to-normal subduction styles and magmatism. In northern Patagonia, the subduction/supra-subduction system, fore arc, arc and b...

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