Elucidation of contributing factors affecting the ζ-potential of volcanic rocks

阐明影响火山岩 ze 电位的因素

• 批准号: 16540375
• 负责人: HASHIMOTO Takeshi
• 金额: $ 1.54万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540375/
• 关键词: streaming potential; ζ-potential; volcanic rocks; self potential; laboratory measurement

ζ-potential of several rock samples from various volcanoes was measured by using streaming potential method. Effects of surface conductivity was also taken into accounted for calculating ζ-potential. This procedure is necessary because surface current on the sample cell is not negligible when compared to the current through pore. Pressure gauge has been implemented to the instrumentation system in the second year.In general, ζ-potential of rock samples show strong dependency on pH of the circulating fluid. Four of the seven samples showed positive ζ-potential under the natural condition without pH control. Such rock samples with positive ζ-potential have already been reported by Hase et al. (2004) which measured the ζ-potential of samples from Aso Volcano. The present study has revealed that such 'anomalous' rocks are not very rare.The author investigated the relationship between major elements and ζ-potential of the rock samples in order to elucidate the contributing factors affecting the polarity of the ζ-potential. However, the correlation between each element and ζ-potential does not seem to be very clear. It was suggested that there should be some hidden factor other than the composition of rock sample itself. Further investigation including mineral composition and dissolved component in the fluid is necessary.Another contribution of the present research is the field measurement of electrical resistivity of Tarumae Volcano, Hokkaido. Our magnetotelluric measurement has revealed that there is a very conductive body just beneath the summit crater of the volcano. This result supports the hydrothermal circulation model that is inferred from self-potential anomaly on the volcano.

使用流势方法测量了来自各种火山的几个岩石样品的ζ电位。还考虑了表面电导率的效果，以计算ζ电位。此过程是必要的，因为与通过孔相比，样品单元上的表面电流不可忽略不计。一般来说，岩石样品的ζ电势对仪器系统实施了压力表，对在没有pH控制的自然条件下显示出正ζ电位的pH四个样本中的pH值很强。 Hase等人已经报道了具有正ζ电位的岩石样品。 （2004年），测量了来自ASO火山的样品的ζ电位。本研究表明，这种“异常”岩石不是很少见。作者研究了岩石样品的主要元素与ζ电位之间的关系，以阐明影响ζ电位极性的因素。但是，每个元素与ζ电位之间的相关性似乎并不十分清晰。有人建议，除了岩石样品本身的组成之外，还应该有一些隐藏的因素。需要进一步研究，包括流体中的矿物质成分和溶解成分。本研究的另一个贡献是北海道塔鲁马火山电阻的现场测量。我们的磁铁测量结果表明，火山的山顶火山口下有一个非常导电的体。该结果支持从火山上的自我电势异常推断出的热液循环模型。

项目成果

Electromagnetism for volcanology -history, significance and prospect- (in Japanese)

火山学电磁学——历史、意义和前景——（日语）

• 发表时间: 2005
• 期刊: Bull.Volcanol.Soc.Japan 50
• 作者: Hashimoto;T.
• 通讯作者: T.

ロングバレー・カルデラ -地殻活動の現在-

长谷火山口 -当前地壳活动 -

• 发表时间: 2006
• 期刊: 月刊地球 28
• 作者: Ohwada;M.;藤原 伸也;廣瀬 亘;廣瀬 亘;橋本 武志;中川 光弘;中川 光弘;高橋 正明;中田 節也;長谷川 健;藤原 伸也;若佐 寛子;古川 竜太;松本 亜希子;古堅 千絵;Mori T.;Mori T.;橋本 武志
• 通讯作者: 橋本 武志

ボーリングコアサンプル(高野尾羽根溶岩)のゼータ電位測定

钻孔岩心样品（Takanoobane 熔岩）的 Zeta 电位测量

• 发表时间: 2005
• 期刊: Conductivity Anomaly 研究会論文集
• 作者: Hase;H.;et al.;橋本武志;T.Ishibashi et al.;長谷英彰・他
• 通讯作者: 長谷英彰・他

Hydrothermal system beneath Aso volcano as inferred from self-potential mapping and resistivity structure

• DOI: 10.1016/j.jvolgeores.2004.12.005
• 发表时间: 2005-05-30
• 期刊: JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
• 影响因子: 2.9
• 作者: Hase, H;Hashimoto, T;Tanaka, Y
• 通讯作者: Tanaka, Y

Hydrothermal system beneath Aso valcano as inferred from self-potential mapping and resistivity structure

根据自电位图和电阻率结构推断阿苏火山下方的热液系统

• 发表时间: 2005
• 期刊: Jour.Volcanol.Geotherm.Res. 143
• 作者: Hase;H.;T.Hashimoto;S.Sakanaka;W.Kanda;Y.Tanaka
• 通讯作者: Y.Tanaka