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首页> 外文期刊>Contributions to Mineralogy and Petrology >Peralkaline felsic magmatism at the Nemrut volcano, Turkey: impact of volcanism on the evolution of Lake Van (Anatolia) IV
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Peralkaline felsic magmatism at the Nemrut volcano, Turkey: impact of volcanism on the evolution of Lake Van (Anatolia) IV

机译：土耳其内姆鲁特火山的碱性碱性长岩岩浆活动：火山活动对范湖（安纳托利亚）演化的影响IV

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摘要

Nemrut volcano, adjacent to Lake Van (Turkey), is one of the most important peralkaline silicic centres in the world, where magmatism for similar to 570,000 years has been dominated by peralkaline trachytes and rhyolites. Using onshore and Lake Van drill site tephra samples, we document the phenocryst and glass matrix compositions, confirming a complete spectrum from very rare mafic to dominantly silicic magmas. Magma mixing has been common and, along with the multi-lineage nature of the magmas, indicates that Nemrut has been a very open system where, nevertheless, compositionally zoned caps developed during periods of relative eruptive quiescence. Geothermometry suggests that the intermediate-silicic magmas evolved in an upper crustal magma reservoir at temperatures between 1100 and 750 degrees C, at fO(2) close to the FMQ buffer. The silicic magmas either were halogen poor or exsolved a halogen-rich phase prior to or during eruption. An unusual Pb-rich phase, with up to 98.78 wt% PbO, is interpreted as having exsolved from the intermediate-rhyolitic magmas.
机译：内姆鲁特火山毗邻范湖（土耳其），是世界上最重要的碱性碱性硅质中心之一，其中约570,000年的岩浆作用主要由碱性碱性的长风钙岩和流纹岩主导。使用陆上和范湖钻探现场的特非拉样品，我们记录了隐晶和玻璃基质成分，证实了从非常罕见的铁镁质岩浆岩到硅质岩浆岩的完整光谱。岩浆混合是很普遍的，连同岩浆的多谱系性质一起，表明内姆鲁特火山是一个非常开放的系统，尽管如此，在相对喷发的静止期，成分带状的顶盖仍然发育。地热测定法表明，中硅质岩浆在上地壳岩浆储层中在1100至750摄氏度之间的温度下演化，接近FMQ缓冲区的fO（2）。硅质岩浆在喷发之前或喷发期间要么贫卤，要么溶出富卤相。含有高达98.78 wt％的PbO的不寻常的富含Pb的相被解释为已从中间流纹岩浆溶出。

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