000165809 001__ 165809 000165809 005__ 20260114135812.0 000165809 0247_ $$2doi$$a10.1093/petrology/egu052 000165809 0248_ $$2sideral$$a90698 000165809 037__ $$aART-2014-90698 000165809 041__ $$aeng 000165809 100__ $$aLarrea, Patricia 000165809 245__ $$aMagmatic evolution of Graciosa island (Azores, Portugal) 000165809 260__ $$c2014 000165809 5203_ $$aGraciosa is the westernmost island of the Terceira Rift, located to the east of the Mid-Atlantic Ridge, in the Azores archipelago. The three volcanic complexes recognized in the island have been characterized, including the study of lava flows, gabbroic xenoliths (alkaline and subalkaline), syenites and dunites. A detailed study of mineral compositions and whole-rock major and trace element concentrations has allowed the characterization of volcanic units and the investigation of the magmatic and temporal evolution of the island. Lava flows from the three volcanic complexes, alkaline gabbros (cumulate origin) and syenites (bulk trachyte liquid origin) can be related by polybaric fractional crystallization starting at ∼15 km depth; to explain the alternation of mafic and evolved products with time, magma chamber replenishment by primitive melts is needed. In contrast, the origin of the subalkaline gabbros, found for the first time in the Azores, appears to be related to fractionation of highly refractory melts at shallower levels (∼3 km). The lack of significant crustal assimilation in most Graciosa samples suggests that the range in Sr–Nd–Pb isotope compositions probably reflects those of a predominantly FOZO-like mantle source. Enriched (EMI- and EMII-type) mantle source components, similar to those of São Miguel and Faial, have also been recognized for the first time in Graciosa. 000165809 540__ $$9info:eu-repo/semantics/closedAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/ 000165809 590__ $$a4.424$$b2014 000165809 591__ $$aGEOCHEMISTRY & GEOPHYSICS$$b8 / 79 = 0.101$$c2014$$dQ1$$eT1 000165809 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000165809 700__ $$aGalé, Carlos 000165809 700__ $$aUbide, Teresa 000165809 700__ $$aWidom, Elisabeth 000165809 700__ $$0(orcid)0000-0002-3609-7380$$aLago, Marceliano$$uUniversidad de Zaragoza 000165809 700__ $$aFrança, Zilda 000165809 7102_ $$12000$$2685$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Petrología y Geoquímica 000165809 773__ $$g55, 11 (2014), 2125-2154$$pJ. Petrol.$$tJOURNAL OF PETROLOGY$$x0022-3530 000165809 8564_ $$s3065080$$uhttps://zaguan.unizar.es/record/165809/files/texto_completo.pdf$$yVersión publicada 000165809 8564_ $$s2379137$$uhttps://zaguan.unizar.es/record/165809/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000165809 909CO $$ooai:zaguan.unizar.es:165809$$particulos$$pdriver 000165809 951__ $$a2026-01-14-12:46:14 000165809 980__ $$aARTICLE