PETROLOGICAL STUDY ON MAGMA STORAGE AND MOVEMENT IN THE UPPER CRUST

上地壳岩浆储存和运动的岩石学研究

基本信息

  • 批准号:
    09640565
  • 负责人:
  • 金额:
    $ 1.98万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
  • 财政年份:
    1997
  • 资助国家:
    日本
  • 起止时间:
    1997 至 1998
  • 项目状态:
    已结题

项目摘要

This research focuses on magmatic processes in magma reservoir and conduit.Porphyritic volcanic rocks contain glomerocrysts and the fragments as phenocrysts. This suggests their entrapment from crystal mush zone in the reservoir margins. Dacite of the latest eruption at Unzen is an example of such porphyritic volcanic rocks, which were mainly studied in this research. Texture of the phenocrysts and the chemical relationship between phenocrysts and groundmass including Sr and Nd isotopic ratios indicate their disequilibrium with the surrounding melt before and during eruption. At Unzen, phenocrysts probably represent crystals from the mushy zone of the magma reservoir, however, where the wall (intrusive rock) rocks were melted due to heating rather than crystallization of the melt occurred due to cooling. Distribution of isotope ratios in individual phenocrysts, with micro isotopic analysis near future, should prove the petrological model.During ascent of hydrous felsic magma in the conduit, melt's crystallization occurs due to degassing. The smaller the magma ascent rate, the more complete both water-loss from the melt and the increase in crystallinity. These facts cause the apparent viscosity of magma increase extremely. As a result, magma became too viscous to move in the top of the conduit. Fragmentation and compaction of foamy and brittle magma may occur easily, and the top of the conduit would be sealed with the compacted lava like a plug. Then, eruption stops. If such sealing is complete, successive crystallization below the plug builds up excess magmatic pressure, and eruption would resumes. The petrological characteristics of the Unzen dacite support this model. The higher the crystallinity of groundmass, the lower the rate of lava effusion. Fragmentation and compaction of foamy magma and the accompanied escape of volcanic gas may have generated low-frequency earthquakes that had occurred in the conduit top during eruption.
本研究主要研究岩浆储集层和输导通道中的岩浆作用。斑岩火山岩中含有球晶和斑晶碎片。这表明它们是从储集层边缘的结晶碎屑带圈闭的。温泉最近一次喷发的英安岩就是这种斑状火山岩的一个例子,本研究主要对其进行了研究。斑晶的结构和斑晶与基质之间的化学关系,包括锶、钕同位素比值,反映了它们在喷发前和喷发过程中与周围熔体的不平衡。在温岑,斑晶很可能是来自岩浆库糊状带的晶体,然而,在那里,围岩(侵入岩)由于加热而熔化,而不是由于冷却而发生熔体结晶。单个斑晶中同位素比值的分布,结合显微同位素分析,在不久的将来应该可以证明岩石学模型。在含水长英质岩浆在管道中上升的过程中,熔体因脱气而结晶。岩浆上升速率越小,熔体失水越彻底,结晶度越高。这些因素导致岩浆的表观粘度极大地增加。结果,岩浆变得太粘稠,无法在管道顶部移动。泡沫和脆性岩浆容易发生破碎和压实,管道顶部会被压实的熔岩像塞子一样密封。然后,喷发停止。如果这种封闭是完全的,塞子下面的连续结晶形成了过量的岩浆压力,喷发将重新开始。深成英安岩的岩石学特征支持这一模式。基质结晶度越高,熔岩流出速率越低。泡沫岩浆的破碎和压实以及伴随的火山气体的泄漏可能导致了在喷发期间在导管顶部发生的低频地震。

项目成果

期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Fujii, T.and S.Nakada: "The 15-September 1991 pyroclastic flows at Unzen Volcano (Japan) : a flowing model." Journal of Volcanology and Geothermal Research. Vol.89 (in press). (1999)
Fujii, T. 和 S.Nakada:“1991 年 9 月 15 日云仙火山(日本)的火山碎屑流:流动模型。”
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
Nakada, S.and Y.Motomura: "Petrology of the 1991-95 eruption at Unzen : effusion pulsation and groundmass crystallization." Journal of Volcanology and Geothermal Research.89(印刷中). (1999)
Nakada, S. 和 Y. Motomura:“1991-95 年云仙火山喷发的岩石学:喷发脉动和基质结晶。”火山学和地热研究杂志。89(出版中)。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
Nakada, S.et al.: "Researchers Discuss Mt.Unzen, a Decade Volcano" EOS,Transactions, American Geophysical Union. Vol.78 No.45. 505-507 (1997)
Nakada, S.et al.:“研究人员讨论云仙山,十年火山”EOS,交易,美国地球物理联盟。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
中田節也: "「マグマと地球」4年間続いた雲仙火山の噴火" 第12回「大学と科学」公開シンポジウム組織委員会編, 120-130 (1998)
中田节也:《岩浆与地球:云仙火山四年的喷发》第12届“大学与科学”公共研讨会组委会编辑,120-130(1998)
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
中田節也ほか: "雲仙国際ワークショップ報告" 火山. 42・3. 239-244 (1997)
Setsuya Nakata 等人:“云仙国际研讨会报告”42・3(1997)。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
{{ item.title }}
{{ item.translation_title }}
  • DOI:
    {{ item.doi }}
  • 发表时间:
    {{ item.publish_year }}
  • 期刊:
  • 影响因子:
    {{ item.factor }}
  • 作者:
    {{ item.authors }}
  • 通讯作者:
    {{ item.author }}

数据更新时间:{{ journalArticles.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ monograph.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ sciAawards.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ conferencePapers.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ patent.updateTime }}

NAKADA Setsuya其他文献

NAKADA Setsuya的其他文献

{{ item.title }}
{{ item.translation_title }}
  • DOI:
    {{ item.doi }}
  • 发表时间:
    {{ item.publish_year }}
  • 期刊:
  • 影响因子:
    {{ item.factor }}
  • 作者:
    {{ item.authors }}
  • 通讯作者:
    {{ item.author }}

{{ truncateString('NAKADA Setsuya', 18)}}的其他基金

General study on the eruption at Shinmoedake volcano, Kirishima, in 2011
2011年雾岛新茂岳火山喷发综合研究
  • 批准号:
    22900001
  • 财政年份:
    2010
  • 资助金额:
    $ 1.98万
  • 项目类别:
RESEARCH ON VOLCANIC ACTIVITY IN THE NORTHERN MARIANAS
北马里亚纳群岛火山活动研究
  • 批准号:
    19403003
  • 财政年份:
    2007
  • 资助金额:
    $ 1.98万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Geological and petrological study on phreatomagmatic explosions of the Miyakejima eruption in 2000
2000年三宅岛喷发的岩浆爆发地质和岩石学研究
  • 批准号:
    16340166
  • 财政年份:
    2004
  • 资助金额:
    $ 1.98万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Petrological research on magma behavior during volcanic eruptions
火山喷发过程中岩浆行为的岩石学研究
  • 批准号:
    12304033
  • 财政年份:
    2000
  • 资助金额:
    $ 1.98万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Origin of phenocrysts and eruption mechanism -in case of Unzen Volcano-.
斑晶的起源和喷发机制-以云仙火山为例-。
  • 批准号:
    07454134
  • 财政年份:
    1995
  • 资助金额:
    $ 1.98万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Research on eruption phenomena of dacite magma
英安岩浆喷发现象研究
  • 批准号:
    04452083
  • 财政年份:
    1992
  • 资助金额:
    $ 1.98万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)

相似海外基金

Collaborative Research: NSFGEO/NERC: After the cataclysm: cryptic degassing and delayed recovery in the wake of Large Igneous Province volcanism
合作研究:NSFGEO/NERC:灾难之后:大型火成岩省火山活动后的神秘脱气和延迟恢复
  • 批准号:
    2317936
  • 财政年份:
    2024
  • 资助金额:
    $ 1.98万
  • 项目类别:
    Continuing Grant
Collaborative Research: NSFGEO/NERC: After the cataclysm: cryptic degassing and delayed recovery in the wake of Large Igneous Province volcanism
合作研究:NSFGEO/NERC:灾难之后:大型火成岩省火山活动后的神秘脱气和延迟恢复
  • 批准号:
    2317938
  • 财政年份:
    2024
  • 资助金额:
    $ 1.98万
  • 项目类别:
    Continuing Grant
NSFGEO-NERC: After the cataclysm: cryptic degassing and delayed recovery in the wake of Large Igneous Province volcanism
NSFGEO-NERC:灾难之后:大火成岩省火山活动后的神秘排气和延迟恢复
  • 批准号:
    NE/Y00650X/1
  • 财政年份:
    2024
  • 资助金额:
    $ 1.98万
  • 项目类别:
    Research Grant
Collaborative Research: NSFGEO/NERC: After the cataclysm: cryptic degassing and delayed recovery in the wake of Large Igneous Province volcanism
合作研究:NSFGEO/NERC:灾难之后:大型火成岩省火山活动后的神秘脱气和延迟恢复
  • 批准号:
    2317937
  • 财政年份:
    2024
  • 资助金额:
    $ 1.98万
  • 项目类别:
    Continuing Grant
Collaborative Research: NSFGEO/NERC: After the cataclysm: cryptic degassing and delayed recovery in the wake of Large Igneous Province volcanism
合作研究:NSFGEO/NERC:灾难之后:大型火成岩省火山活动后的神秘脱气和延迟恢复
  • 批准号:
    2317935
  • 财政年份:
    2024
  • 资助金额:
    $ 1.98万
  • 项目类别:
    Continuing Grant
Collaborative Research: NSFGEO/NERC: After the cataclysm: cryptic degassing and delayed recovery in the wake of Large Igneous Province volcanism
合作研究:NSFGEO/NERC:灾难之后:大型火成岩省火山活动后的神秘脱气和延迟恢复
  • 批准号:
    2317939
  • 财政年份:
    2024
  • 资助金额:
    $ 1.98万
  • 项目类别:
    Continuing Grant
Does depressurization by degassing of a magma chamber induce an eruption?
岩浆室脱气减压是否会引发火山喷发?
  • 批准号:
    23KJ1160
  • 财政年份:
    2023
  • 资助金额:
    $ 1.98万
  • 项目类别:
    Grant-in-Aid for JSPS Fellows
Magmatic volatiles and degassing from the Earth
岩浆挥发物和地球脱气
  • 批准号:
    RGPIN-2020-04197
  • 财政年份:
    2022
  • 资助金额:
    $ 1.98万
  • 项目类别:
    Discovery Grants Program - Individual
Collaborative Proposal: Tectonic degassing as a possible solution to the Miocene climate enigma
合作提案:构造脱气作为解决中新世气候之谜的可能方法
  • 批准号:
    2202777
  • 财政年份:
    2022
  • 资助金额:
    $ 1.98万
  • 项目类别:
    Standard Grant
Collaborative Proposal: Tectonic degassing as a possible solution to the Miocene climate enigma
合作提案:构造脱气作为解决中新世气候之谜的可能方法
  • 批准号:
    2202760
  • 财政年份:
    2022
  • 资助金额:
    $ 1.98万
  • 项目类别:
    Standard Grant
{{ showInfoDetail.title }}

作者:{{ showInfoDetail.author }}

知道了