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.

沉积物循环对俯冲带岩浆形成和演化以及大陆地壳生长的影响知之甚少。俯冲沉积物的熔体混合到地幔中，导致玄武岩或安山岩岩浆熔化，这对于大陆地壳的形成很重要。爱琴海弧处存在厚达 8 公里的沉积物，其中很大一部分被俯冲，从而在弧熔岩中形成强烈的沉积物特征。帕夫萨尼亚斯海底火山是爱琴海弧最西端的火山之一，于 1987 年才被发现，显然在大约 2000 年前就已经活跃。在 2017 年 4 月/5 月的 Poseidon 512 巡航期间，我们计划使用遥控潜水器 (ROV) PHOCA 首次探索这座火山，在此我们申请 ROV 的租赁费用。 ROV 可以对熔岩和火山碎屑岩进行详细观察和地层采样，并了解喷发单元和潜在的热液活动。我们怀疑帕夫萨尼亚斯火山的喷发单元中存在丰富的火山玻璃，因此可以直接测定液体的成分及其挥发物含量。这将为沉积物俯冲和岩浆形成、混合和脱气以及喷发的过程提供重要的新见解。该项目将帮助人们更好地了解大陆生长情况以及位于雅典西南仅 50 公里处的帕夫萨尼亚斯火山的潜在火山危害。