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Mineralogical and geochemical evidence of magma mingling/mixing in the Sierra de las Cruces volcanic range, Mexican Volcanic Belt

机译:墨西哥火山带塞拉德拉克鲁斯山脉火山岩浆混合/混合的矿物学和地球化学证据

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摘要

Pliocene – Pleistocene lava flows, mainly of dacitic composition, are exposed in the Sierra de las Cruces (SC) volcanic rangeudwithin the Mexican Volcanic Belt (MVB).udSC volcanic rocks are porphyritic, generally containing an assemblage of plagioclase + amphibole + orthopyroxene ± clino-udpyroxene ± quartz ± Fe-Ti oxides. Most of them exhibit diverse mineralogical and geochemical features that attest a magma mixing and mingling processes with concomitant fractional crystallization in which a small volume of hot andesite magma injects into dacitic magma. Both rock types are probably derived from partial melting of continental crust at different levels.udThe evidences of magma mixing and mingling include: (a) normal and sieved plagioclases in the same sample, rounded and embayed crystals, and armoured rims over the dissolved crystal surfaces; (b) subrounded, vesicular magmatic enclaves, ranging from a few millimeters to ~20 centimeters in size, with plagioclase + orthopyroxene + amphibole + quartz ± olivine ± Fe-Ti-oxides assemblage; (c) mineral chemistry evidence such as crystals with reaction rims or heterogeneous plagioclase compositions (inverse and oscillatory zoning or normally and inversely zoned crystals) in the same sample; and (d) elemental geochemical variations and trace-element ratio more akin to magma mixing and to some extent diffusion process.udThese andesitic enclaves could be considered as portions of the intermediate magma that did not mix completely (mingling) with the felsic host lavas, confirming the major role of magma mixing and mingling processes in the overall evolution of the MVB
机译:上新世–更新世的熔岩流,主要是达格世组成的,在墨西哥火山带(MVB)内的拉克鲁斯山脉(SC)火山范围内 udud暴露。邻苯二茂±±斜二茂rox±石英±Fe-Ti氧化物。它们中的大多数表现出多种矿物学和地球化学特征,证明了岩浆的混合和混合过程以及伴随的分步结晶,其中少量的热安山岩岩浆注入了胶结岩浆。这两种类型的岩石都可能来自大陆壳在不同水平上的部分熔融。表面; (b)亚圆形的囊状岩浆聚居区,大小在几毫米至约20厘米之间,并有斜长石+邻苯二酚+角闪石+石英±橄榄石±Fe-Ti-氧化物组合; (c)矿物化学证据,例如同一样品中具有反应边缘或异质斜长石组成的晶体(反向和振荡带或正向和反向分区的晶体); (ud)这些安山岩群可被认为是中间岩浆中未与长岩浆岩熔岩完全混合(混合)的部分岩浆。 ,证实了岩浆混合和混合过程在MVB整体演化中的主要作用

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