Observation and investigation for the formation SPM originates in high temperature volcanic gas

高温火山气体SPM形成的观测与研究

基本信息

  • 批准号:
    15310126
  • 负责人:
  • 金额:
    $ 3.78万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
  • 财政年份:
    2003
  • 资助国家:
    日本
  • 起止时间:
    2003 至 2006
  • 项目状态:
    已结题

项目摘要

The high temperature fumarolic gasi is the source of SPM emitted from active volcanoes. In order to investigate the control on the chemical composition of high temperature volcanic gas, a degassing model of magma was constructed based on the data observed at Mt. Unzen. The volcanic gas rich in CO_2 and SO_2was estimated to be separated from magma at depth -8 km from surface. The degassed magma again exsolved a gas phase rich in H_O and CH1 at depth shallower than -1 km.The amount of SPM would be proportional to the flux of SO_2 gas. As a case study, the mechanism of SO_2 degassing was investigated at Miyakejima volcano. A diffused SO_2 gas was sampled at the flank of volcano by using the so called chemical trap method. In the method, a KOH solution was exposed over several months under open air. The volcanic SO_2 gas was absorbed into the KOH solution. At the absorption, the occurrence of a kinetically isotopic fractionation was confirmed by an laboratory experiment. Employing the experimentally determined isotopic fractionation, the δ^<34>S of S in magma of Miyakejima volcano was estimated to be identical to the value typical to the Quarternary volcanoes in Japan. The temporal change in the observed δ^<34> S of SO_2 gas, a monotonically decreasing, δ^<34> S, could be attributed to the open system degassing of magma. The isotopic fractionation between gas phase and magma depends on oxygen fugacity. The oxygen fugacity necessary to produce the isotopic fractionation compatible to the open degassing of magma was estimated to be +0.6 to +1.2 log unit higher than Ni-NiO oxygen fugacity buffer.
高温的火山气体是活火山喷出SPM的来源。为了探讨火山岩高温气体化学成分的控制作用,根据天山地区的火山岩高温气体观测资料,建立了火山岩岩浆脱气模型。云善富含CO_2和SO_2的火山气可能在距地表-8km处与岩浆分离。当深度小于-1km时,脱气后的岩浆再次溶出富含H_O和CH_1的气相,SPM的量与SO_2气体的流量成正比。以三宅岛火山为例,研究了SO_2的脱气机理。用化学捕集法在火山侧翼采集了扩散的SO_2气体。在该方法中,KOH溶液在露天下暴露数月。用KOH溶液吸收火山SO_2气体。在吸收,动力学同位素分馏的发生证实了实验室实验。利用实验测定的同位素分馏,估算了<34>三宅岛火山岩浆中S的δ^ S值与日本第四纪火山的典型值相同。SO_2气体δ^ S随时间的变化<34>是一个单调递减的过程<34>,这可能是岩浆开放系统脱气的结果。氧逸度决定了气相和岩浆之间的同位素分馏。产生与岩浆开放脱气相容的同位素分馏所需的氧逸度估计比Ni-NiO氧逸度缓冲区高+0.6至+1.2个对数单位。

项目成果

期刊论文数量(3)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Magma degassing process during the eruption of Mt. Unzen, Japan in 1991 to 1995: Modeling with the chemical composition of volcanic gas
  • DOI:
    10.1016/j.jvolgeores.2008.03.040
  • 发表时间:
    2008-07
  • 期刊:
  • 影响因子:
    2.9
  • 作者:
    T. Ohba;J. Hirabayashi;K. Nogami;M. Kusakabe;Minoru Yoshida
  • 通讯作者:
    T. Ohba;J. Hirabayashi;K. Nogami;M. Kusakabe;Minoru Yoshida
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OHBA Takeshi其他文献

OHBA Takeshi的其他文献

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{{ truncateString('OHBA Takeshi', 18)}}的其他基金

Volcanic eruption potential diagnosis by volcanic gas observation
火山气体观测诊断火山喷发潜力
  • 批准号:
    15K12485
  • 财政年份:
    2015
  • 资助金额:
    $ 3.78万
  • 项目类别:
    Grant-in-Aid for Challenging Exploratory Research
Remote sensing for the volcanic fluid by use of back scattering Raman light
利用背散射拉曼光遥感火山流体
  • 批准号:
    23656565
  • 财政年份:
    2011
  • 资助金额:
    $ 3.78万
  • 项目类别:
    Grant-in-Aid for Challenging Exploratory Research
Mechanisms of drug-resistance and apoptosis in oral carcinoma cells
口腔癌细胞耐药及凋亡机制
  • 批准号:
    16591893
  • 财政年份:
    2004
  • 资助金额:
    $ 3.78万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Reasons for an action and Self-determination -beyond "Internalism vs Externalism"
行动的理由和自我决定——超越“内在主义与外在主义”
  • 批准号:
    14510049
  • 财政年份:
    2002
  • 资助金额:
    $ 3.78万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Investigation of oral cancer development by using apoptosis and its application for clinical evaluation
利用细胞凋亡研究口腔癌发生发展及其在临床评价中的应用
  • 批准号:
    12671836
  • 财政年份:
    2000
  • 资助金额:
    $ 3.78万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Experimental study on the detection of jaw lesions with photo-roentgenographic and conventional panoramic radiography
射线照相与常规全景X线摄影检测颌骨病变的实验研究
  • 批准号:
    05671576
  • 财政年份:
    1993
  • 资助金额:
    $ 3.78万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
Study on the image diagnosis of maxillary sinus abnormality using panoramic radiography
全景X线成像诊断上颌窦异常的研究
  • 批准号:
    62570905
  • 财政年份:
    1987
  • 资助金额:
    $ 3.78万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)

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岩浆室脱气减压是否会引发火山喷发?
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  • 财政年份:
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