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Geosciences 2017, 7(3), 63; doi:10.3390/geosciences7030063

Multimethod Approach to the Study of Recent Volcanic Ashes from Tengger Volcanic Complex, Eastern Java, Indonesia

1
Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Bandung 40132, Indonesia
2
Research Center for Knowledge Science in Cultural Heritage, Doshisha University, Kyoto 610-0394, Japan
*
Author to whom correspondence should be addressed.
Academic Editors: Marco Viccaro and Jesús Martínez Frías
Received: 17 April 2017 / Revised: 15 July 2017 / Accepted: 25 July 2017 / Published: 26 July 2017
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Abstract

Volcanic ash is a volcanic product with a wide distribution that can be used as a geological marker. In volcanic regions such as Indonesia, the identification of the sources of volcanic ash and tuff layers from different volcanoes or eruptive events is a challenging task. In this study, samples of volcanic ash from the 2010 eruption of Bromo—a relatively young and active tuff cone volcano within the Sandsea caldera in the Tengger volcanic complex in East Java, Indonesia—along with two older tuff layers from the same caldera (Widodaren tuff: 1.8 kyr and Segarawedi tuff: 33 kyr) were subjected to magnetic measurements, geochemical analyses, and petrographic analyses. The aim is to attempt to use magnetic characters as a fingerprint for volcanic ash and tuff layers. The results show that the samples had variations in grain size and magnetic domain as indicated by the hysteresis parameters. These magnetic characters correlated with the results of geochemical and petrographic analyses, suggesting that magnetic properties may potentially be used as fingerprints to identify volcanic ashes and tuff layers. View Full-Text
Keywords: 2010 Bromo ash; volcanic ash; magnetic characteristics; geochemistry; Tengger 2010 Bromo ash; volcanic ash; magnetic characteristics; geochemistry; Tengger
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Santoso, N.A.; Bijaksana, S.; Kodama, K.; Santoso, D.; Dahrin, D. Multimethod Approach to the Study of Recent Volcanic Ashes from Tengger Volcanic Complex, Eastern Java, Indonesia. Geosciences 2017, 7, 63.

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