Role and chemical characteristics of magmatic fluid on material recycling process between earth's crust and upper mantle at subduction zone.

岩浆流体对俯冲带地壳与上地幔物质循环过程的作用及化学特征.

• 批准号: 08640601
• 负责人: FUJINAWA Akihiko
• 金额: $ 1.28万
• 依托单位: IBARAKI UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08640601/
• 关键词: magma genesis; magmatic fluid; island arc magmatism; mantle metasomatism; マグマ成因論

Representative low-alkali tholeiitic rock samples are collected from Iwate, Minami-Zao and Adatara volcanoes at volcanic front and also from Akita-Komagatake at inner side from the volcanic front in northeastern Japan arc. Basic concept of this research is that the characteristics of slab-derived fluid must be inferred from the heterogeneity postulated in magma source mantle beneath a single volcano. Such mantle heterogeneity should be revealed through petrochemical investigations trying to make clear the diversity of parental magmas and evorutionary processes for the tholeiitic magma batch systems that is believed to originate in mantle.Five tholeiitic magma batch systems are recognized at Iwate volcano, and each batch has distind parental magma and evolutionary process. Similarly, 3 co-genetic magma suites are distinguished among the tholeiitic series at Minami-Zao volcano. As for the Akita-Komagatake volcano, at least 4 suites of tholeiitic magmas exist in its post-caldera stage.Based on distinctive chemical characteristics among the tholeiitic parental magmas within a single volcano, the magma source region beneath the volcanic front may be enriched in Rb and K but not Ba through matasomatism by slab-derived fluid. Further, difference in LIL/HFS between tholeiitic and calc-alkaline magma suites coexisting at the volcanic front may reflect such heterogeneity in magma source region. In addition, it is revealed that the fractional crystallization is not always the main evorutionary process in the tholeiitic series ; magmatic mixing or assimialation may be the main

从iWate，Minami-Zao和Adatara火山收集了代表性的低谷歌岩石样品，以及来自日本东北部火山阵线的内侧的Akita-Komagatake的Akita-Komagatake。这项研究的基本概念是，必须从单个火山下的岩浆源地幔中假定的异质性来推断板衍生的流体的特征。这种地幔异质性应通过石油化学研究来揭示，试图清楚地表明，据信，据信tholeiitic magma批处理系统的父母岩浆和感知过程的多样性。同样，在Minami-Zao火山的Tholeiitic系列中也区分了3个共同基因岩浆套房。至于Akita-komagatake火山，至少有4个tholeiitic岩浆存在于其后阶段。基于单个火山中的泰利氏岩岩浆在单个火山中的独特化学特征，这是岩浆源区域，火山阵线下的岩浆源区域可以通过RB和KA中的BA来通过Slab-slab-dercerverive vricive。此外，在火山阵线共存的tholeiitic和calcalaine岩浆套件之间的LIL/HFS差异可能反映了岩浆源区域的这种异质性。此外，据揭示了分数结晶并不总是蒂利特群系中的主要回忆过程。岩浆混合或同化可能是主要的

项目成果

A.Fujinawa, T.H.Green: "Partitioning behaviour of Hf and Zr between amphibole,clinopyroxene,garnet and silicate melts at high pressure" European Journal of Mineralogy. 9. 379-391 (1997)

A.Fujinawa、T.H.Green：“高压下角闪石、单斜辉石、石榴石和硅酸盐熔体中 Hf 和 Zr 的分配行为”《欧洲矿物学杂志》。

A.Fujinawa, T.H.Green: "Partitioning behavior of Hf and Zr between amphibole, clinopyroxene, garnet and silicate melts at high pressure." European Journal of Mineralogy. 9. 379-391 (1997)

A.Fujinawa、T.H.Green：“高压下 Hf 和 Zr 在角闪石、单斜辉石、石榴石和硅酸盐熔体之间的分配行为。”

藤縄明彦,T.H.グリーン: "合成実験による角閃石、単斜輝石、ザクロ石と珪酸塩メルト間のHf・Zrの分配" 岩鉱(日本岩石鉱物鉱床学会誌). 92・2. 69-89 (1997)

Akihiko Fujinawa，T.H. Green：“通过合成实验在角闪石、单斜辉石、石榴石和硅酸盐熔体之间分配 Hf 和 Zr”《岩石矿物》（日本岩石和矿物沉积学会杂志）92・2（1997 年）。

A.Fujinawa, T.H.Green: "Experimental study of partitioning of Hf and Zr between amphibole, clinopyroxene, garnet and silicate melts." Journal of Mineralogy, Petrology and Economic Geology. 92. 69-89 (1997)

A.Fujinawa、T.H.Green：“Hf 和 Zr 在角闪石、单斜辉石、石榴石和硅酸盐熔体之间分配的实验研究。”

藤縄明彦, T.H.グリーン: "合成実験による角閃石,単斜輝石,ザクロ石と珪酸塩メルト間のHf・Zrの分配" 岩鉱(日本岩石鉱物鉱床学会誌). 92・2. 69-89 (1997)

Akihiko Fujinawa，T.H. Green：“通过合成实验在角闪石、单斜辉石、石榴石和硅酸盐熔体之间分配 Hf 和 Zr”《岩石矿物》（日本岩石和矿物沉积学会杂志）92・2（1997 年）。