Geochemical Investigation of the Aegean Volcanic Arc

爱琴海火山弧的地球化学调查

基本信息

批准号：
05041056
负责人：
NOTSU Kenji
金额：
$ 5.76万
依托单位：
the University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05041056/
关键词：
The Aegean volcanic arc Greece Magmatic volatile materials Volcanic gas Fumarolic gas Hot spring Geochemistry Volcano-geomorphology

项目摘要

The purpose of this Field Research is to investigate magmatic activities in the Aegean volcanic arc by means of both geochemical approach of volcanic volatiles and volcano-geomorphological approach. Because the Aegean arc is characterized by the continental (African) plate subduction, in contrast to most of volcanic arcs including Japanese arcs related to oceanic plate subduction, this arc plays an important role for the comparative study of arc volcanism.Japanese investigators visited Greece during 19 August to 19 September, 1993, and 12 September to 14 October, 1994. They carried out field surveillance of volcanic and geothermal areas in Greece with a Greek investigator. Investigated places of two years' surveillance are Susaki, Methana, Aegina, Milos, Santrini, Kos and Nisylos volcanoes along the volcanic front, and Lesbos and Ikaria islands and Thermolipes and Edipusos geothermal ares in the back arc region. In each place, we carried out (1) firld survey of magmatic volatile materials such as volcanic gas, fumarolic gas and hot spring gas, (2) field survey of hot springs and (3) volcano-geomorphological survey. We collected gas samples and water samples in each investivated place and brought them back to Japan for chemical and isotope analyzes.For gas samples, ^3He/^4He ratio and delta^<13>C of CO_2 were determined. While, chemical composition and H and O isotope were determined for water samples. Preliminaty results show that most of hot spring waters are in meteoritic origin and that gas samples include magma-derived helium, and carbon in marine carbonate origin. After completing the chemical and isotope analyzes of collected samples, we will discuss the origin of magmatic volatiles and their release mechanism under the con nental plate subduction, in combination with morphological findings.

这项现场研究的目的是通过火山挥发物的地球化学方法和火山地球化学方法研究爱琴海火山弧中的岩浆活动。因为与大多数火山弧（包括与海洋板块俯冲的日本弧相比）相比，Aeegean Arc的特征是大陆（非洲）板块俯冲的特征，因此该弧在8月19日至1993年9月19日至199年10月14日的范围内，在1993年9月19日至9月12日的范围内拜访了希腊的弧线研究中，该弧扮演着重要的作用。希腊与希腊调查员的地区。调查了两年的监视地点是沿火山沿火山阵线的Susaki，Methana，Aegina，Milos，Santrini，Kos和Nisylos火山，以及Lesbos和Ikaria Islands以及Thermolipes以及后弧区的Edipusos Geothermal Ares。在每个地方，我们对岩浆挥发性材料（例如火山气体，烟气气和温泉气体）进行了（1）调查（2）温泉的现场调查以及（3）火山地球形态调查。我们在每个投资的地方收集了气体样品和水样品，并将它们带回日本进行化学和同位素分析。对于气体样品，确定了^3he/^4he比率和Delta^<13> C的CO_2。同时，确定了用于水样品的化学组成和H和O同位素。预序的结果表明，大多数温泉水都处于陨石的起源，气体样品包括岩浆衍生的氦气和海洋碳酸盐的碳。在完成收集样品的化学和同位素分析后，我们将讨论岩浆挥发物及其在构造板俯冲下的释放机制的起源，并结合形态学发现。