000165802 001__ 165802
000165802 005__ 20260114135812.0
000165802 0247_ $$2doi$$a10.1093/petrology/egs084
000165802 0248_ $$2sideral$$a81389
000165802 037__ $$aART-2013-81389
000165802 041__ $$aeng
000165802 100__ $$0(orcid)0000-0001-8470-2840$$aLarrea,P.$$uUniversidad de Zaragoza
000165802 245__ $$aMagmatic processes and the role of antecrysts in the genesis of Corvo island (Azores archipelago, Portugal)
000165802 260__ $$c2013
000165802 5203_ $$aCorvo island is one of two Azorean islands located to the west of the Mid-Atlantic Ridge. Its small size and the existence of a single main eruptive center make it an ideal island for an in-depth study of the magmatic processes controlling its evolution. This study presents detailed petrographic and geochemical data for representative samples of the complete volcanostratigraphic sequence (Pre-, Syn- and Post-caldera stages), including lava flows, dikes and cumulate gabbroic xenoliths hosted in a Pre-caldera lava flow. Some lava flows and dikes contain large crystals that are not in equilibrium with the host magma. These crystals are antecrysts crystallized from progenitor magmas that have been reincorporated into the host lava before eruption. We note for the first time that the accumulation of antecrysts in Azorean magmas strongly affects the bulk composition of the rocks. Antecryst contents as high as 50–60% can result in whole-rocks with MgO contents of 15 wt %. This accumulation process obscures the magmatic processes responsible for the differentiation of the volcanic products. Accordingly, only antecryst-free samples are considered to identify the magmatic processes involved in the generation of the island. The least evolved antecryst-free rock was used as the closest composition to the primary magma for modeling of major element (MELTS) and trace element variations; our results establish a petrogenetic relationship between Corvo antecryst-free lava flows, dikes and cumulate xenoliths, all of which are products of polybaric fractional crystallization. Pre- and Post-caldera products are related to an ∼15 km deep magma chamber, whereas the Syn-caldera evolved products are related to a shallower magma chamber. These results suggest that Corvo island developed from a complex magmatic plumbing system in which magmas and their crystal cargo, derived from variable depths, have interacted and been tapped throughout the evolution of the island.
000165802 536__ $$9info:eu-repo/grantAgreement/ES/DGA/B023-10$$9info:eu-repo/grantAgreement/ES/MICINN/CGL2008-06098-BTE$$9info:eu-repo/grantAgreement/ES/MINECO/CGL2011-27477
000165802 540__ $$9info:eu-repo/semantics/closedAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000165802 590__ $$a4.485$$b2013
000165802 591__ $$aGEOCHEMISTRY & GEOPHYSICS$$b7 / 80 = 0.087$$c2013$$dQ1$$eT1
000165802 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000165802 700__ $$aFrança,Z.
000165802 700__ $$0(orcid)0000-0002-3609-7380$$aLago,M.$$uUniversidad de Zaragoza
000165802 700__ $$aWidom,E.
000165802 700__ $$0(orcid)0000-0002-2745-0357$$aGalé,C.$$uUniversidad de Zaragoza
000165802 700__ $$0(orcid)0000-0002-2944-8736$$aUbide,T.
000165802 7102_ $$12000$$2685$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Petrología y Geoquímica
000165802 773__ $$g54, 4 (2013), 769-793$$pJ. Petrol.$$tJOURNAL OF PETROLOGY$$x0022-3530
000165802 8564_ $$s2039837$$uhttps://zaguan.unizar.es/record/165802/files/texto_completo.pdf$$yVersión publicada
000165802 8564_ $$s2399970$$uhttps://zaguan.unizar.es/record/165802/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000165802 909CO $$ooai:zaguan.unizar.es:165802$$particulos$$pdriver
000165802 951__ $$a2026-01-14-12:46:05
000165802 980__ $$aARTICLE