Increased rates of large-magnitude explosive eruptions in Japan in the late Neogene and Quaternary

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doi: 10.1002/2016GC006362
Author(s): Mahony, Sue H.; Sparks, R. S. J.; Wallace, L. M.; Engwell, S. L.; Scourse, E. M.; Barnard, N. H.; Kandlbauer, J.; Brown, S. K.
Author Affiliation(s): Primary:
University of Bristol, School of Earth Sciences, Bristol, United Kingdom
University of Texas at Austin, United States
Volume Title: Geochemistry, Geophysics, Geosystems - G<sup>3</sup>
Source: Geochemistry, Geophysics, Geosystems - G>3`, 17(7), p.2467-2479. Publisher: American Geophysical Union and The Geochemical Society, United States. ISSN: 1525-2027
Note: In English. 42 refs.; illus., incl. 4 tables, sketch map
Summary: Tephra layers in marine sediment cores from scientific ocean drilling largely record high-magnitude silicic explosive eruptions in the Japan arc for up to the last 20 million years. Analysis of the thickness variation with distance of 180 tephra layers from a global data set suggests that the majority of the visible tephra layers used in this study are the products of caldera-forming eruptions with magnitude (M) > 6, considering their distances at the respective drilling sites to their likely volcanic sources. Frequency of visible tephra layers in cores indicates a marked increase in rates of large magnitude explosive eruptions at ∼8 Ma, 6-4 Ma, and further increase after ∼2 Ma. These changes are attributed to major changes in tectonic plate interactions. Lower rates of large magnitude explosive volcanism in the Miocene are related to a strike-slip-dominated boundary (and temporary cessation or deceleration of subduction) between the Philippine Sea Plate and southwest Japan, combined with the possibility that much of the arc in northern Japan was submerged beneath sea level partly due to previous tectonic extension of northern Honshu related to formation of the Sea of Japan. Changes in plate motions and subduction dynamics during the ∼8 Ma to present period led to (1) increased arc-normal subduction in southwest Japan (and resumption of arc volcanism) and (2) shift from extension to compression of the upper plate in northeast Japan, leading to uplift, crustal thickening and favorable conditions for accumulation of the large volumes of silicic magma needed for explosive caldera-forming eruptions. Abstract Copyright (2016), . The Authors.
Year of Publication: 2016
Research Program: DSDP Deep Sea Drilling Project
IODP Integrated Ocean Drilling Program
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 05 Petrology, Igneous and Metamorphic; Asia; Cenozoic; Cores; DSDP Site 296; DSDP Site 297; DSDP Site 301; DSDP Site 434; DSDP Site 436; DSDP Site 438; DSDP Site 440; Deep Sea Drilling Project; East China Sea; Eruptions; Expedition 346; Explosive eruptions; Far East; IODP Site C0001; IODP Site U1422; IODP Site U1423; IODP Site U1424; IODP Site U1425; IODP Site U1426; IODP Site U1427; IODP Site U1428; IODP Site U1429; IODP Site U1430; IPOD; Igneous rocks; Integrated Ocean Drilling Program; Japan; Japan Basin; Japan Sea; Japan Trench; Kyushu-Palau Ridge; Leg 127; Leg 128; Leg 144; Leg 185; Leg 186; Leg 190; Leg 31; Leg 56; Leg 57; Marine sediments; NanTroSEIZE; Nankai Trough; Neogene; North Pacific; Northwest Pacific; ODP Site 1149; ODP Site 1150; ODP Site 1151; ODP Site 1177; ODP Site 794; ODP Site 795; ODP Site 796; ODP Site 799; ODP Site 808; ODP Site 880; Ocean Drilling Program; Pacific Ocean; Philippine Sea; Plate tectonics; Plates; Pyroclastics; Quaternary; Sediments; Shikoku Basin; Submarine volcanoes; Tertiary; Ulleung Basin; Volcanic ash; Volcanic rocks; Volcanism; Volcanoes; West Pacific; Yamato Basin; Yamato Rise
Coordinates: N300000 N450000 E1470000 E1290000
Record ID: 2017009951
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