Presentations -

New insight the tephra-stratigraphy of Mt. Tangkuban Parahu, Indonesia into Holocene eruption history.

Syahreza S. Angkasa・Tsukasa Ohba

日本火山学会2018年度秋季大会  (秋田大学)  2018.09  -  2018.09  日本火山学会

Understanding the 2014 Initial Eruption of Mount Kelud, Indonesia through the Product Sequences Revealed in the Western Flank.

Astiti Anggoro Wati・Tsukasa Ohba

日本火山学会2018年度秋季大会  (秋田大学)  2018.09  -  2018.09  日本火山学会

東北日本、鳥海山の紀元前466年以降のマグマ供給系の変遷．

伴　雅雄・高橋拓也・佐藤昂徳・林　信太郎・大場　司・新城竜一・西　勇樹

日本火山学会2018年度秋季大会  (秋田大学)  2018.09  -  2018.09  日本火山学会

Unearthing tephra deposit, and petrological trace of subvolcanic magma dynamics of two active intra-caldera volcanoes north of the Rabaul volcanic complex-Papua New Guinea

Lloyd Singura・大場　司

日本火山学会2018年度秋季大会  (秋田大学)  2018.09  -  2018.09  日本火山学会

Spatial and Temporal Variations of Tangkil and Rajabasa Volcanoes, Southern Sumatra, Indonesia and Their Lead into Evolution of Magmas since Pliocene.

Reza Firmansyah Hasibuan・大場　司・Mirzam Abdrrachman・星出隆志

日本火山学会2018年度秋季大会  (秋田大学)  2018.09  -  2018.09  日本火山学会

Eruptive products from hydrothermal systems beneath active volcanoes

Tsukasa Ohba, Keita Ito, Takumi Imura, and Yusuke Minami

EGU General Assembly 2018  (Vienna, Austria)  2018.04  -  2018.04  EGU

Altered ash particles mineralogy from Mt. Tangkuban Parahu volcanic products, Indonesia: constraint on the sub-volcanic hydrothermal system.

Syahreza Angkasa, Tsukasa Ohba, Mirzam Abdurachman, Iwan Setiawan, and Mega Rosana

EGU General Assembly 2018  (Vienna, Austria)  2018.04  -  2018.04  EGU

Ash petrology on non-juvenile fragments in pyroclastic deposits: an example from Azuma volcano, Fukushima, North-eastern Japan

Imura Takumi, Ohba Tsukasa, Horikoshi Kenta

Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences  2018  -  2018  Japan Association of Mineralogical Sciences

This study petrologically investigated non-juvenile ash grains in pyroclastic deposits at Azuma volcano. By bulk XRD analysis, the samples before Az-OA shows the clear X-ray peaks of smectite and kaolin, while samples after Az-OA showed the strong X-ray peaks of plagioclase, pyroxene, and amphibole. Samples of Az-OA are abundant in acidic-altered ash, also contains neutral-altered grains Whereas, the Az-P7 sample is rich in unaltered ash of extremely high crystalline andesite.

DOI

Unearthing tephra deposit, and petrological trace of subvolcanic magma dynamics of two active intra-caldera volcanoes north of Rabaul volcanic complex-Papua New Guinea

Singura Lloyd, Ohba Tsukasa

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN  2018  -  2018  The Volcanological Society of Japan

DOI

Spatial and Temporal Variations of Tangkil and Rajabasa Volcanoes, Southern Sumatra, Indonesia and Their Lead into Evolution of Magmas since Pliocene

HASIBUAN Reza Firmansyah, OHBA Tsukasa, ABDURRACHMAN Mirzam, HOSHIDE Takashi

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN  2018  -  2018  The Volcanological Society of Japan

DOI

Petrology and Geochemistry of a young, basaltic volcanism in Palawan, Philippines: Implications on magma source and regional heterogeneities in South China Sea

Refran James Cesar, Ohba Tsukasa

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN  2018  -  2018  The Volcanological Society of Japan

DOI

Magma characteristics of Rajabasa volcanic complex inferred from petrological approach

Reza Firmansyah Hasibuan, Tsuksa Ohba, Mirzam abdurrachman, Takashi Hoshide

Joint Convention Malang 2017, Makang, Indonesia  2017.10  -  2017.10 

水蒸気噴火火山灰の組成多様性

大場司・井村匠・伊藤啓太・南裕介

日本火山学会2017年秋季大会  (熊本大学)  2017.09  -  2017.09  日本火山学会

Volcanic fluids-rock interaction inferred from characteristics of altered minerals in volcanic products at Tokachidake volcano, central Hokkaido, Japan

Takumi Imura, Tsukasa Ohba, and Nakagawa Mitsuhiro

IAVCEI  (Portland, US)  2017.08  -  2017.08  IAVCEI

,Magma characteristics of Rajabasa volcanic complex inferred from petrological approach

Reza Firmansyah Hasibuan, Tsuksa Ohba, Mirzam abdurrachman, Takashi Hoshide

IAVCEI  (Portland, US)  2017.08  -  2017.08  IAVCEI

Interaction between volcanic fluid and magma, inferred from altered volcanic ash particles: examples from arc composite cones in Japan

T, Ohba, T. Imura, K. Ito, Y. Minami

IAVCEI  (Portland, US)  2017.08  -  2017.08  IAVCEI

Volcanic fluids-rock interaction inferred from characteristics of altered minerals in volcanic products at Tokachidake volcano, central Hokkaido, Japan,

T. Imura, M. T. Ohba., Nakagawa

JpGU  (幕張)  2017.05  -  2017.05  JpGU

Occurrence and origin of the kaolin-rich gravelly sediments at Rendaiji of Yuzawa, Akita, Japan

Kano Kazuhiko, Ishiyama Daizo, Oba Tsukasa, Oguchi Takeshi, Fujimoto Yukio

Annual Meeting of the Geological Society of Japan  2017  -  2017  The Geological Society of Japan

<b> [Program canceled for typhoon]</b> Program canceled for typhoon. However, This abstract is quotable and viewable on PDF.

DOI

Component diversity of volcanic ash from phreatic eruptions

Ohba Tsukasa, Imura Takumi, Ito Keita, Minami Yusuke

Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences  2017  -  2017  Japan Association of Mineralogical Sciences

We observed volcanic ash of phreatic eruptions from Ontake, Tokachi, Kurikoma, and Azuma volcanoes. Various alteration conditions are interpreted from the alteration mineral assemblages. The difference in the alteration mineralogy is related to the frequency of magma eruptions. The volcanoes with high frequencies of magma extrusions tend to discharge the ash with the monotonous mineral assemblages of the low-T advanced argillic alteration, whereas those with low frequencies are related to the assemblages from porphyry-type hydrothermal systems.

DOI

Phenocryst Zoning Patterns Developed during Evolution of Magma Mixing: Case Studies from Northern Honshu and Western Java Arcs

Tsukasa Ohba, Sho Komatsu, Shintaro Hayashi, Masao Ban, Kohei Takayama and Iwan Setiawan

AGU fall meeting  (San Francisco)  2014.12  -  2014.12  AGT