Heterogeneities in the Cohesion of the Deposits of the 2021 Tajogaite Eruption of La Palma (Canary Islands, Spain)

IF 2.4 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Alfonso Ontiveros-Ortega, José A. Moleón-Baca, Raúl Huertas Mesa, Isabel Abad, Mario Sánchez-Gómez
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Abstract

The present study analyzes the electrical and thermodynamic properties of the volcanic ash deposits from the recent eruption that started on 19 September 2021 in the Cumbre Vieja area on the island of La Palma. This work compares the analysis of the zeta potential and the surface free energy components of representative samples of unaltered tephra deposits with samples affected by the fumarolic activity near the emission zone, where sulfurous vapors were present. The results show that fumarolic activity modifies both the zeta potential and the surface free energy components of volcanic ash, decreasing its surface electrical charge and conferring less hydrophilicity on the deposit. Based on this, the interaction energies between ash particles in an aqueous medium have been calculated, in order to analyze the cohesion of the deposit and, where appropriate, its rheological properties, ending with the analysis of the effect produced by different chemical species on the surface charge and free energy of the ashes, and their influence on the cohesion of the deposit. The results confirm an attractive interaction energy between the ash particles and therefore greater stability to the deposit affected by fumarolic activity.
西班牙拉帕尔马岛(加那利群岛)2021年Tajogaite火山喷发沉积物黏聚性的非均质性
本研究分析了2021年9月19日在拉帕尔马岛Cumbre Vieja地区最近爆发的火山灰沉积物的电学和热力学性质。这项工作比较了未改变的tephra沉积物的代表性样品的zeta电位和表面自由能成分的分析,这些样品受到排放区附近的富马酚活性的影响,其中硫磺蒸气存在。结果表明,富马酚活性改变了火山灰的zeta电位和表面自由能组分,降低了其表面电荷,降低了沉积物的亲水性。在此基础上,计算了水介质中灰颗粒之间的相互作用能,以分析沉积物的凝聚力,并在适当的情况下分析其流变特性,最后分析了不同化学物质对灰烬的表面电荷和自由能产生的影响,以及它们对沉积物凝聚力的影响。结果证实了灰颗粒之间有吸引力的相互作用能,因此更大的稳定性受到富马罗碱活性影响的沉积物。
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来源期刊
Geosciences (Switzerland)
Geosciences (Switzerland) Earth and Planetary Sciences-Earth and Planetary Sciences (all)
CiteScore
5.30
自引率
7.40%
发文量
395
审稿时长
11 weeks
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