Abstract In volcanic areas where evolved and primitive magmas coexist, it is common to observe evidence of magma mixing. At the Neogene silicic volcano of El Hoyazo in SE Spain, the detailed petrological and geochemical characteristics of the phenocrysts (plagioclase, biotite, amphibole and pyroxene) as well as their host dacitic lavas allow the reconstruction of the structure of the magma plumbing system. Microtextures, modal abundances, and geochemistry of zoned phenocrysts reveal a stratified magma composed of (i) high-SiO2 dacites with An-poor ( 80%) plagioclase, Mg-rich pyroxene, and tschermakitic hornblende, whose zoning records different crystallization depths during magma ascent. Evidence from the hornblende varieties and from mafic enclaves or inclusions indicates that the stratified chamber was repeatedly injected by hotter magmas from greater depth.

中文翻译：

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英安岩内的不平衡斑晶组合揭示了西班牙东南部 El Hoyazo 火山地壳同化后的岩浆混合和分层室

摘要 在演化和原始岩浆共存的火山区，经常观察到岩浆混合的迹象。在西班牙东南部 El Hoyazo 的新近纪硅质火山中，斑晶（斜长石、黑云母、角闪石和辉石）及其宿主英安质熔岩的详细岩石学和地球化学特征允许重建岩浆管道系统的结构。带状斑晶的微观结构、模态丰度和地球化学揭示了一种分层岩浆，由 (i) 含贫 (80%) 斜长石的高 SiO2 英安岩、富镁辉石和切镁质角闪石组成，其分区记录了岩浆过程中不同的结晶深度上升。