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首页> 外文期刊>Journal of Volcanology and Geothermal Research >A complex magma reservoir system for a large volume intra- to extra-caldera ignimbrite: Mineralogical and chemical architecture of the VEI8, Permian Ora ignimbrite (Italy)
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A complex magma reservoir system for a large volume intra- to extra-caldera ignimbrite: Mineralogical and chemical architecture of the VEI8, Permian Ora ignimbrite (Italy)

机译：一个复杂的岩浆储层系统，用于大范围的火山口外到火山口的火成岩：VEI8的矿物学和化学结构，二叠纪Ora火成岩（意大利）

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摘要

Intra-caldera settings record a wealth of information on caldera-forming processes, yet field study is rarely possible due to lack of access and exposure. The Permian Ora Formation, Italy, preserves >1000 m of vertical section through its intra-caldera succession. This provides an excellent opportunity to detail its mineralogical and geochemical architecture and gain understanding of the eruption evolution and insight into the pre-eruptive magma system. Detailed juvenile clast phenocryst and matrix crystal fragment point count and image analysis data, coupled with bulk-rock chemistry and single mineral compositional data, show that the Ora ignimbrite succession is rhyolitic (72.5-77.7% SiO2), crystal-rich (similar to 25-57%; average 43%) and has a constant main mineral population (volcanic quartz + sanidine + plagioclase + biotite). Although a seemingly homogeneous ignimbrite succession, important subtle but detectable lateral and vertical variations in modal mineralogy and bulk-rock major and trace elements are identified here.
机译：破火山口内部设置记录了有关破火山口形成过程的大量信息，但是由于缺乏接触和暴露，实地研究很少能进行。意大利的二叠纪Ora组在火山口内部演替过程中保留了大于1000 m的垂直剖面。这提供了一个极好的机会，可以详细说明其矿物学和地球化学构造，并获得对喷发演化的了解以及对喷发前岩浆系统的了解。详细的幼年碎裂角晶和基质晶体碎片点计数和图像分析数据，再加上块状岩石化学和单一矿物成分数据，表明Ora着火成因岩为流纹岩（SiO 2为72.5-77.7％），晶体丰富（约25 -57％；平均43％），并具有恒定的主要矿物质种群（火山岩+山梨酸+斜长石+黑云母）。尽管看似均匀的火成岩演替，但在此确定了模态矿物学，块状岩石主要元素和微量元素中重要但细微但可检测到的横向和纵向变化。

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