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Mineral chemistry of the gabbroic Messejana – Plasencia dyke in the north-eastern sector

dc.contributor.authorAndonaegui, P.
dc.contributor.authorVillaseca, Carlos
dc.contributor.authorLópez García, José Ángel
dc.description.abstractIn the gabbroic Messejana–Plasencia dyke we have distinguished three types of pyroxenes: enstatite, pigeonite and augite. Enstatite and augite have been the first minerals that have crystallized at high T (1100ºC – 1150ºC). Pigeonites (@1000ºC) are later and finally appear symplectic two-pyroxene intergrowths around the orthopyroxene. Plagioclase have a continuous zonation with cores of An75 towards rims of An18. Occasionally, there is a micrographic intergrowth of orthoclase–quartz or albite-quartz interstitially to the plagioclase and pyroxene framework. Three types of amphibole have been distinguished: ferroedenite, magnesiohornblende and ferroactinolite. The estimated temperature range of amphibole crystallization is low suggesting that most amphiboles are subsolidus. Finally, biotite are FeO and TiO2 rich, its crystallization being late when residual liquids were enriched in those elementsen_US
dc.publisherSociedad Geológica de Españaen_US
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España
dc.subject.otherMessejana–Plasencia dykeen_US
dc.subject.otherTholeiitic gabbroen_US
dc.subject.otherMineral chemistryen_US
dc.subject.otherP-T conditionsen_US
dc.titleCaracterización de los minerales del dique gabroideo de Messejana - Plasencia en su sector nor-orientalen_US
dc.titleMineral chemistry of the gabbroic Messejana – Plasencia dyke in the north-eastern sectoreng

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