One million years tephra record at IODP Sites U1436 and U1437; insights into explosive volcanism from the Japan and Izu Arcs

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doi: 10.1111/iar.12244
Author(s): Schindlbeck, Julie Christin; Kutterolf, Steffen; Straub, Susanne M.; Andrews, Graham D. M.; Wang, Kuo-Lung; Mleneck-Vautravers, Maryline J.
Author Affiliation(s): Primary:
Heidelberg University, Institute of Earth Sciences, Heidelberg, Germany
GEOMAR Helmholtz Center for Ocean Research Kiel, Germany
Lamont-Doherty Earth Observatory, United States
West Virginia University, United States
Academia Sinica, Institute of Earth Sciences, Taiwan
University of Cambridge, United Kingdom
Volume Title: Island Arc
Source: Island Arc, 27(3). Publisher: Wiley Blackwell on behalf of Geological Society of Japan, Tsukuba, Japan. ISSN: 1038-4871
Note: In English with Japanese summary. 87 refs.; illus., incl. 2 tables, sketch maps
Summary: The 1 Myr tephra records of IODP (International Ocean Discovery Program) Holes U1436A and U1437B in the Izu-Bonin fore- and reararc were investigated in order to assess provenance and eruptive volumes, respectively. In total, 304 tephra samples were examined and 260 primary tephra layers were identified. Tephra provenance was determined by means of major and trace element compositions of glass shards and distinguished between Japan and Izu-Bonin arc origin of the tephra layers. A total of 33 marine tephra compositions were correlated to the Japan arc and 227 to the Izu arc. Twenty marine tephra layers were correlated between the two drilling sites. Additionally, we defined eleven correlations of marine tephra deposits to major widespread Japanese eruptions; from the 1.05 Ma Shishimuta-Pink Tephra to the 30 ka Aira-Tn Tephra, both from Kyushu Island. These eruptions provide independent time markers within the sediment record and six correlations were used to date tephra layers from Japan in Hole U1436A to establish an alternative age model for this hole. Furthermore, the minimum distal tephra volumes of all detected events were calculated, which enabled the comparison of the tephra volumes that derived from the Japan and the Izu-Bonin arcs. For some of the major Japanese eruptions these are the first volume estimations that also include distal deposits. All of the Japanese tephras derived from events with eruption magnitude Mv ≥ 5.6 and three of the investigated eruptions reach magnitudes Mv ≥ 7. Volcanic events of the Izu-Bonin arc have mostly eruption magnitudes Mv ≤ 5. Abstract Copyright (2018), John Wiley & Sons, Ltd.
Year of Publication: 2018
Research Program: IODP Integrated Ocean Drilling Program
IODP2 International Ocean Discovery Program
Key Words: 24 Surficial Geology, Quaternary Geology; Aira-Tn Tephra; Andesites; Asia; Basalts; Cenozoic; Correlation; Dacites; Electron probe data; Eruptions; Expedition 350; Explosive eruptions; Far East; Foraminifera; Globigerinacea; ICP mass spectra; IODP Site U1436; IODP Site U1437; Igneous rocks; International Ocean Discovery Program; Island arcs; Izu-Bonin Arc; Izu-Bonin-Mariana Arc; Japan; Kyushu; Major elements; Marine sediments; Mass spectra; Middle Pleistocene; Neogloboquadrina; Neogloboquadrina dutertrei; North Pacific; Northwest Pacific; Pacific Ocean; Planktonic taxa; Pleistocene; Provenance; Pyroclastics; Quaternary; Rhyolites; Rotaliina; Sediments; Shishimuta-Pink Tephra; Spectra; Tephrostratigraphy; Trace elements; Upper Pleistocene; Volcanic rocks; Volcanism; Volcanology; West Pacific
Coordinates: N314723 N314724 E1390136 E1390134
N322352 N322354 E1402157 E1402157
Record ID: 2019010329
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom