Volcanism, Sedimentation, and Hydrothermal activity in Santorini, Greece

希腊圣托里尼岛的火山活动、沉积作用和热液活动

• 批准号: 2696635
• 金额: --
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2696635
• 关键词: Volcanism; Sedimentation; Hydrothermal; activity; Santorini

Volcanic arcs are very important in terms of their impact on society since they are usually densely populated and thus pose a high risk (Sigurdsson, 2015). Santorini is considered one of the most violent and famous volcanoes in the world (Varnavas and Papavasiliou, 2020). It is the most active hydrothermal centre of the Hellenic Volcanic Arc in the Aegean Sea. The central and eastern sectors of the arc are characterized by large stratovolcanoes with caldera structures (Santorini) whilst the western part has mainly small, monogenic eruptive centres. Both subduction and extension occurs in the arc whereby the associated volcanism is thought to result from the subduction of the African lithosphere beneath the Aegean microplate (Varnavas and Papavasiliou, 2020). Though activity is considered to have begun in the late Pliocene, most of it is Quaternary (Druitt et al., 1999).Santorini has a caldera structure created by multiple collapse events, one of which is the famous so-called Minoan eruption of ca. 1650 BCE, which covered neighbouring lands with thick tephra and caused tsunamis. Two volcanic islets, Palea Kameni and Nea Kameni (the Kameni Islands), were progressively formed in the middle of the caldera between 197 BCE and 1950 CE (Tarchini et al., 2019). Santorini magmas range from basaltic to rhyolitic and evidence of magma mixing is common, as [is the case(?)] for many arc magma systems (Druitt et al., 2019).

火山弧在对社会的影响方面非常重要，因为它们通常人口稠密，因此构成了高风险（Sigurdsson，2015年）。圣托里尼被认为是世界上最暴力和著名的火山之一（Varnavas和Papavasiliou，2020年）。它是爱琴海希腊火山弧的最活跃的热液中心。弧的中部和东部地区的特征是具有火山口结构（Santorini）的大型层状结构，而西部的西部主要具有很小的单基因喷发中心。俯冲和延伸都发生在弧形中，因此，相关的火山被认为是由于爱琴海微孔板下的非洲岩石圈的俯冲造成的（Varnavas和Papavasiliou，2020年）。尽管活动被认为是在上新世晚期开始的，但其中大部分是第四纪（Druitt等，1999）。Santorini具有由多个倒塌事件产生的火山口结构，其中之一是著名的所谓的CA。公元前1650年，覆盖着附近的土地厚厚的tephra，并引起了海啸。在公元前197年至1950年之间，在火山口的中部逐渐形成了两个火山小岛Palea Kameni和Nea Kameni（Kameni群岛）（Tarchini等，2019）。圣托里尼岩浆范围从玄武岩到流纹状体，岩浆混合的证据很常见，因为许多弧岩浆系统的情况（？）是这种情况（Druitt等，2019）。