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Formation and evolution of magmas due to sediment subduction: a case study of the submarine Paphsanias volcano, Aegean arc

沉积物俯冲导致岩浆的形成和演化：以爱琴海弧海底帕夫萨尼亚斯火山为例

基本信息

批准号：
378188864
负责人：
Professor Dr. Karsten Matthias Haase
金额：
--
依托单位：
GeoZentrum Nordbayern
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/378188864?language=en
关键词：
Formation evolution magmas due sediment

项目摘要

The effects of sediment recycling on the formation and evolution of magmas at subduction zones and on the growth of the continental crust are poorly known. Melts of subducted sediments mix into the mantle and cause melting of basaltic or andesitic magmas that are important for the formation of the continental crust. Up to 8 km thick sediment deposits exist at the Aegean arc and signficant portions of these are subducted leading to a strong sediment signature in the arc lavas. One of the westernmost volcanoes of the Aegean arc is the submarine volcano Paphsanias that was found only in 1987 and that apparently was active some 2000 years ago. During cruise Poseidon 512 in April/May 2017 we plan to explore this volcano for the first time using the remotely operated vehicle (ROV) PHOCA and here we apply for the cost of the rental of the ROV. The ROV allows detailed observations and stratigraphic sampling of the lavas and volcaniclastic rocks as well as an understanding of eruptive units and potential hydrothermal activity. We suspect abundant volcanic glasses in the eruptive units of Paphsanias volcano so that the composition of liquids and their volatile contents can be directly determined. This will provide important new insights into the processes of sediment subduction and magma formation, of mixing and degassing as well as of eruption. This project will lead to a better understanding of continental growth and of potential volcanic hazards of the Paphsanias volcano that lies only 50 km SW of Athens.

沉积物再循环对俯冲带岩浆的形成和演化以及对大陆地壳生长的影响知之甚少。俯冲沉积物的熔融物混入地幔，导致玄武质或安山质岩浆的熔融，这对大陆地壳的形成至关重要。在爱琴海弧存在厚达8公里的沉积物沉积物，这些沉积物的重要部分被俯冲，导致弧熔岩中有强烈的沉积物特征。爱琴海弧最西端的火山之一是海底火山Paphsanias，1987年才被发现，显然在大约2000年前活跃。在2017年4月/5月的Poseidon 512巡航期间，我们计划首次使用遥控飞行器（PHOCA）探索这座火山，在此我们申请租用遥控飞行器的费用。该仪器可以对熔岩和火山岩进行详细的观察和地层取样，并了解喷发单位和潜在的热液活动。我们怀疑Paphsanias火山喷发单元中有丰富的火山玻璃，因此可以直接确定液体的组成及其挥发分含量。这将为研究沉积物俯冲和岩浆形成、混合和脱气以及喷发过程提供重要的新见解。该项目将导致更好地了解大陆的增长和位于雅典西南仅50公里处的Paphsanias火山的潜在火山危险。