将岩石磁性分析作为研究漂移浮石碎屑多样性的工具:以 2021 年日本福德大阪火山(FOB)喷发为例

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Island Arc Pub Date : 2023-12-28 DOI:10.1111/iar.12507
Julie Carlut, Aude Isambert, Claire Carvallo, Geoffrey Garcia da Fonseca, Nelly-Wangue Moussissa, Arthur Bouis, Kenta Yoshida
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引用次数: 0

摘要

由于纳米石对增加熔体粘度和引发岩浆喷发的影响,岩浆腔内的纳米石结晶最近引起了人们的强烈兴趣。2021 年,Fukutoku-Oka-no-Ba(FOB)水下喷发产生了大量浮石,这些浮石最终在海面上形成浮筏漂流到日本东海岸。Yoshida 等人(Island Arc, 31, 1, 2022)通过显微镜和拉曼分析(Island Arc, 31, 1, 2022)发现其中一些浮石中存在磁铁矿纳米石。在本研究中,我们探索了一批来自 FOB 火山喷发的不同颜色浮石的磁特性,旨在完善纳米氧化铁的表征。我们使用了各种分析技术,如扫描电镜和 FEG-SEM 观察、EDS-X 分析以及岩石磁性实验,包括热磁分析、磁滞曲线、矫顽力分析和 FORC 测量。我们的研究结果表明,FOB 样品中的铁氧化物是钛磁铁矿,并含有少量的镁和铝。磁性晶体的尺寸范围很广,从浅色浮石中的超小型氧化铁纳米石(ESION)到一些深色样品中达到微米大小的大颗粒,在这种情况下可以推断出明显的扩散。因此,Fukutoku-Oka-no-Ba 浮灰中氧化铁晶体的磁性特征揭示了成核、溶解、生长和扩散过程的不同阶段,为岩浆在喷发过程中的异质状态提供了证据。
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Rock magnetic analyses as a tool to investigate diversity of drift pumice clasts: An example from Japan's 2021 Fukutoku-Oka-no-Ba (FOB) eruption

The crystallization of nanolites within magma chambers has recently raised a strong interest due to their impact on increasing melt viscosity and triggering magmatic eruptions. In 2021, the Fukutoku-Oka-no-Ba (FOB) underwater eruption produced large quantities of pumices that eventually formed rafts drifting at the surface of the ocean to the East coasts of Japan. Pumices collected along the shore shortly after grounding show various colors, microscopic and Raman analyses made by Yoshida et al. (Island Arc, 31, 1, 2022) revealed the presence of magnetite nanolites in some of them. In this study, we explore the magnetic properties of a batch of pumices of different colors from the FOB eruption, aiming to refine characterization of iron oxide nanolites. We used various analytical techniques such as SEM and FEG-SEM observations, EDS-X analyses, and rock magnetic experiments, including thermomagnetic analyses, hysteresis curves, coercivity analyses and FORC measurements. Our findings reveal that the iron oxides present in the FOB samples are Ti-magnetite, with minor amounts of Mg and Al. The magnetic crystals show a wide range of sizes, from extra small iron oxide nanolites (ESION) in the pumices with the lighter colors, to more bulky grains reaching the micrometer size in some of the dark color samples, significant diffusion is inferred in that case. Consequently, the magnetic characterization of iron oxide crystals within the Fukutoku-Oka-no-Ba pumices reveals varying stages of nucleation, dissolution, growth, and diffusion processes, providing evidences for the heterogeneous state of the magma during the eruption.

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来源期刊
Island Arc
Island Arc 地学-地球科学综合
CiteScore
2.90
自引率
26.70%
发文量
32
审稿时长
>12 weeks
期刊介绍: Island Arc is the official journal of the Geological Society of Japan. This journal focuses on the structure, dynamics and evolution of convergent plate boundaries, including trenches, volcanic arcs, subducting plates, and both accretionary and collisional orogens in modern and ancient settings. The Journal also opens to other key geological processes and features of broad interest such as oceanic basins, mid-ocean ridges, hot spots, continental cratons, and their surfaces and roots. Papers that discuss the interaction between solid earth, atmosphere, and bodies of water are also welcome. Articles of immediate importance to other researchers, either by virtue of their new data, results or ideas are given priority publication. Island Arc publishes peer-reviewed articles and reviews. Original scientific articles, of a maximum length of 15 printed pages, are published promptly with a standard publication time from submission of 3 months. All articles are peer reviewed by at least two research experts in the field of the submitted paper.
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