Geochemical Investigation of the Aegean Volcanic Arc

爱琴海火山弧的地球化学调查

• 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

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.

本野外研究的目的是利用火山挥发物地球化学方法和火山地貌学方法研究爱琴海火山弧的岩浆活动。由于爱琴海弧具有大陆（非洲）板块俯冲的特征，与包括日本弧在内的大多数与大洋板块俯冲有关的火山弧不同，爱琴海弧对弧火山作用的比较研究具有重要意义。日本调查人员于1993年8月19日至9月19日和1994年9月12日至10月14日访问了希腊。他们与一名希腊调查员一起对希腊的火山和地热地区进行了实地监测。两年监测的调查地点是沿火山锋的Susaki、Methana、Aegina、Milos、Santrini、Kos和Nisylos火山，以及弧后地区的Lesbos和Ikaria岛以及Thermolipes和Edipusos地热区。在各地开展了(1)火山气、富马酸气、温泉气等岩浆挥发性物质的野外调查；(2)温泉野外调查；(3)火山地貌调查。我们在每个调查地点收集了气体样本和水样，并将它们带回日本进行化学和同位素分析。对气体样品测定了CO_2的^3He/^4He比值和δ ^<13>C。测定了水样的化学成分和氢、氧同位素。初步结果表明，温泉水主要为陨石成因，气体样品中有岩浆成因的氦和海相碳酸盐岩成因的碳。在完成对所采集样品的化学和同位素分析后，我们将结合形态学发现，讨论岩浆挥发物的来源及其在大陆板块俯冲下的释放机制。

项目成果

K.NOTSU,J.MATSUDA,I.KITA,I.MORIYA and P.MITROPOULOS: "Geochemistny of volcanic gases from the Aegean island arc" Bull,Geol.Soc.Greece. (予定).

K.NOTSU、J.MATSUDA、I.KITA、I.MORIYA 和 P.MITROPOULOS：“爱琴海岛弧火山气体的地球化学”Bull，Geol.Soc.Greece（计划中）。

I.KITA and P.MITROPOULOS: "Isotope geochemistry of geothermol waters and associated bubbling gases from the Aegean volcanic arc" Chem. Geol.(予定).

I. KITA 和 P. MITROPOULOS：“来自爱琴海火山弧的地热水和相关冒泡气体的同位素地球化学”，Chem。

Moriya, I., M.Okuna, T.Nakamura, A.Szakacs and I.Seghedi: "The last eruption and geomorphology of Ciomadul volcano, Rumania" Chirigaku-Hyoron. (in preparation).

Moriya, I.、M.Okuna、T.Nakamura、A.Szakacs 和 I.Seghedi：“罗马尼亚 Ciomadul 火山的最后一次喷发和地貌”Chirigaku-Hyoron。

K.NOTSU,J.MATSUDA,I.KITA,K.NAGAO,I.MORIYA and P.MITROPOULOS: "Geochemistry of volcanic volatiles from the Aegean arc" J. Volcanol. Geotherm. Res.(予定).

K. NOTSU、J. MATSUDA、I. KITA、K. NAGAO、I. MORIYA 和 P. MITROPOULOS：“爱琴海弧火山挥发物的地球化学”J. Volcanol。

守屋,奥野、中村、A.SZAKA S and I.SEGHEDI: "ル-マニアCiomadul火山の地形と最終噴火" 地理学評論. ((予定))

Moriya、Okuno、Nakamura、A.SZAKA S 和 I.SEGHEDI：“罗马尼亚 Ciomadul 火山的地形和最终喷发”地理评论（（计划中））。