%0 Journal Article
%A Andonaegui Moreno, María Del Pilar
%A Villaseca González, Carlos
%A López García, José Ángel
%T Caracterización de los minerales del dique gabroideo deMessejana - Plasencia en su sector nor-oriental
%D 2005
%@ 0213-683X
%U https://hdl.handle.net/20.500.14352/49614
%X In 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 intergrowthsaround the orthopyroxene. Plagioclase have a continuous zonation with cores of An75 towards rims ofAn18. Occasionally, there is a micrographic intergrowth of orthoclase–quartz or albite-quartz interstitiallyto the plagioclase and pyroxene framework. Three types of amphibole have been distinguished: ferroedenite,magnesiohornblende and ferroactinolite. The estimated temperature range of amphibole crystallization islow suggesting that most amphiboles are subsolidus. Finally, biotite are FeO and TiO2 rich, its crystallizationbeing late when residual liquids were enriched in those elements.
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