Tephrostratigraphy and provenance from IODP Expedition 352, Izu-Bonin Arc; tracing tephra sources and volumes from the Oligocene to recent

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doi: 10.1002/2017GC007100
Author(s): Kutterolf, S.; Schindlbeck, J. C.; Robertson, A. H. F.; Avery, A.; Baxter, A. T.; Petronotis, K.; Wang, K. L.
Author Affiliation(s): Primary:
GEOMAR-Helmholtz Center for Ocean Research Kiel, Dynamics of the Ocean Floor, Kiel, Germany
Heidelberg University, Germany
University of Edinburgh, United Kingdom
Florida State University, United States
University of New England, Australia
Texas A&M University, United States
Academia Sinica, Taiwan
National Taiwan University, Taiwan
Volume Title: Geochemistry, Geophysics, Geosystems - G<sup>3</sup>
Source: Geochemistry, Geophysics, Geosystems - G>3`, 19(1), p.150-174. Publisher: American Geophysical Union and The Geochemical Society, United States. ISSN: 1525-2027
Note: In English. 128 refs.; illus., incl. 1 table, sketch map
Summary: Provenance studies of widely distributed tephras, integrated within a well-defined temporal framework, are important to deduce systematic changes in the source, scale, distribution, and changes in regional explosive volcanism. Here, we establish a robust tephrochronostratigraphy for a total of 157 marine tephra layers collected during IODP Expedition 352. We infer at least three major phases of highly explosive volcanism during Oligocene to Pleistocene time. Provenance analysis based on glass composition assigns 56 of the tephras to a Japan source, including correlations with 12 major and widespread tephra layers resulting from individual eruptions in Kyushu, Central Japan, and North Japan between 115 ka and 3.5 Ma. The remaining 101 tephras are assigned to four source regions along the Izu-Bonin arc. One, exclusively assigned to the Oligocene age, is proximal to the Bonin Ridge islands; two reflect eruptions within the volcanic front and back-arc of the central Izu-Bonin arc, and a fourth region corresponds to the Northern Izu-Bonin arc source. First-order volume estimates imply eruptive magnitudes ranging from 6.3 to 7.6 for Japan-related eruptions and between 5.5 and 6.5 for IBM eruptions. Our results suggest tephras between 30 and 22 Ma reflect a subtly different Izu-Bonin chemical signature compared to the recent arc. After a ∼9 Ma gap in eruption, tephra supply from the Izu-Bonin arc predominated from 15 to 5 Ma, and finally a subequal mixture of tephra sources from the (palaeo)Honshu and Izu-Bonin arcs occurred within the last ∼5 Ma. Abstract Copyright (2017), . The Authors.
Year of Publication: 2018
Research Program: IODP Integrated Ocean Drilling Program
IODP2 International Ocean Discovery Program
ODP Ocean Drilling Program
Key Words: 05 Petrology, Igneous and Metamorphic; 12 Stratigraphy, Historical Geology and Paleoecology; Asia; Bonin Islands; Cenozoic; Chemical composition; Expedition 350; Expedition 351; Expedition 352; Far East; Holocene; Honshu Arc; IODP Site U1436; IODP Site U1437; IODP Site U1438; IODP Site U1439; IODP Site U1440; IODP Site U1441; IODP Site U1442; Igneous rocks; International Ocean Discovery Program; Izu-Bonin Arc; Japan; Leg 125; Leg 126; Leg 132; Leg 185; Major elements; North Pacific; Northwest Pacific; Ocean Drilling Program; Ocean floors; Oligocene; Pacific Ocean; Paleogene; Philippine Sea; Pleistocene; Provenance; Pyroclastics; Quaternary; Tephrostratigraphy; Tertiary; Trace elements; Volcanic rocks; Volume; West Pacific; West Pacific Ocean Islands
Record ID: 2018049117
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom, Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union

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