High-K volcanism in the Afyon region, western Turkey: from Si-oversaturated to Si-undersaturated volcanism
High-K volcanism in the Afyon region, western Turkey: from Si-oversaturated to Si-undersaturated volcanism
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土耳其西部阿菲永地区高钾火山活动：从硅过饱和火山活动到硅欠饱和火山活动
DOI：
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发表时间：
2013
影响因子：
2.3
通讯作者：
P. Bogaard
中科院分区：
文献类型：
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作者：
C. Akal;C. Helvaci;D. Prelević;P. Bogaard
阿菲永省（安纳托利亚西部的东部）的火山岩组成了一个多阶段的钾质和超钾质碱性系列，其年龄为14 - 12 Ma。阿菲永城周围及其以南的早期硅过饱和火山岩为粗安质火山活动（14.23 ± 0.09Ma）。晚期硅不饱和火山作用在阿菲永火山省的最南端发生在三个事件推断，从他们的地层关系和年龄。第一幕为黄长石-白榴岩（11.50 ± 0.03 Ma）、斑点状粗安岩、粗安岩和粗安岩（11.91 ± 0.13 Ma），第二幕为粗安岩，最后一幕为响岩、响岩、玄武质粗安岩和含鼻状粗安岩。西安纳托利亚火山作用的参数Q [normalq-（ne + lc + kls + ol）]在10-15 Ma时间间隔内随时间的变零明显向南减小。虽然在阿菲永火山区的整个生命周期中，硅过饱和岩浆和硅欠饱和岩浆共存，但在阿菲永火山区晚期的12 Ma左右，岩浆活动在14 Ma后硅饱和度发生了突变。
Volcanic rocks of the Afyon province (eastern part of western Anatolia) make up a multistage potassic and ultrapotassic alkaline series dated from 14 to 12 Ma. The early-stage Si-oversaturated volcanic rocks around the Afyon city and further southward are trachyandesitic volcanic activity (14.23 ± 0.09 Ma). Late-stage Si-undersaturated volcanism in the southernmost part of the Afyon volcanic province took place in three episodes inferred from their stratigraphic relationships and ages. Melilite–leucitites (11.50 ± 0.03 Ma), spotted trachyandesites, tephryphonolites and lamproites (11.91 ± 0.13 Ma) formed in the first episode; trachyandesites in the second episode and finally phonotephrites, phonolite, basaltic trachyandesites and nosean-bearing trachyandesites during the last episode. The parameter Q [normative q-(ne + lc + kls + ol)] of western Anatolia volcanism clearly decreased southward with time becoming zero in the time interval 10–15 Ma. The magmatism experienced a sudden change in the extent of Si saturation after 14 Ma, during late-stage volcanic activity of Afyon volcanic province at around 12 Ma, though there was some coexistence of Si-oversaturated and Si-undersaturated magmas during the whole life of Afyon volcanic province.