PRELIMINARY PETROMAGNETIC STUDY OF 1849, 1926, 1963, 1968 AND 1974 SURFACE LAVAS FROM BATUR VOLCANO, BALI, INDONESIA: INSIGHT ON THE MAGMATIC PROCESS OF SOURCE AND ROCK MAGNETIC NATURE

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-01-01 DOI:10.17794/rgn.2023.1.3

Putu Billy Suryanata, S. Bijaksana, M. Abdurrachman, D. Dahrin, Aditya Pratama, N. R. D. W. Ndari, S. J. Fajar

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Abstract

Geochemical and petrographic characterizations were carried out on five episodic effusive eruptions from Batur Volcano on the Island of Bali, Indonesia, and revealed that these lavas are basaltic to andesitic in composition. Various micro-textures were identified, reflecting pre-eruptive magmatic processes, magma mixing, and adiabatic decompression. Apart from XRF analyses, the five lava flows (L849, L926, L963, L968 and L974) were subjected to magnetic analyses in the form of magnetic susceptibility and magnetic hysteresis measurements. The presence of cyclicity in the magmatic process is suggested by the variation of micro-texture types, CaO content, and magnetic susceptibility values. Two possible models of this cyclicity are presented. In the first model, cyclicity is driven by the variation of influx from the lower magma chamber that affects the interaction of magma with the surrounding rocks. In the second model, cyclicity is affected by the appearance of a new magmatic vent, which causes intense interaction with surrounding rocks. This study infers that combined micro-texture, composition, and magnetic susceptibility analyses might provide insight into the cyclicity of lava episodes observed in active volcanos such as Batur.

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印度尼西亚巴厘batur火山1849年、1926年、1963年、1968年和1974年表面熔岩的岩石磁学初步研究:源岩浆过程和岩石磁性质的认识

对印度尼西亚巴厘Batur火山5次喷发的岩浆进行了地球化学和岩石学表征，结果表明，这些熔岩的成分为玄武岩-安山岩。发现了不同的微观结构，反映了喷发前的岩浆过程、岩浆混合和绝热减压。除了XRF分析外，还对L849、L926、L963、L968和L974这5个熔岩流进行了磁化率和磁滞测量。显微结构类型、CaO含量和磁化率值的变化表明岩浆过程中存在旋回性。提出了这种循环的两种可能的模型。在第一个模型中，旋回性是由下部岩浆房流入量的变化驱动的，这种变化影响了岩浆与周围岩石的相互作用。在第二个模型中，旋回性受到一个新的岩浆喷口的出现的影响，它与周围岩石产生强烈的相互作用。这项研究推断，结合微观结构、成分和磁化率分析，可能有助于了解在巴图尔等活火山中观察到的熔岩事件的旋回性。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.