350_101_Summary.PDF (27.99 MB)
Expedition 350 summary
journal contributionposted on 2023-05-19, 04:44 authored by Tamura, Y, Busby, CJ, Blum, P, Guerin, G, Andrews, GDM, Barker, AK, Berger, JLR, Bongiolo, EM, Bordiga, M, DeBari, SM, Gill, JB, Hamelin, C, Jia, J, John, EH, Jonas, A-S, Martin JutzelerMartin Jutzeler, Kars, MAC, Kita, ZA, Konrad, K, Mahoney, SH, Martini, M, Miyazaki, T, Musgrave, RJ, Nascimento, DB, Nichols, ARL, Ribiero, JM, Sato, T, Schindlbeck, JC, Schmitt, AK, Straub, SM, Vautravers, MJ, Yang, Y
nternational Ocean Discovery Program (IODP) Hole U1436A (proposed Site IBM-4GT) lies in the western part of the Izu fore-arc basin, ~60 km east of the arc-front volcano Aogashima, ~170 km west of the axis of the Izu-Bonin Trench, and 1.5 km west of Ocean Drilling Program (ODP) Site 792, at 1776 meters below sea level (mbsl). It was drilled as a 150 m deep geotechnical test hole for potential future deep drilling (5500 meters below seafloor [mbsf]) at proposed Site IBM-4 using the D/V Chikyu. Core from Site U1436 yielded a rich record of Late Pleistocene explosive volcanism, including a distinctive black glassy mafic ash layer that may record a large-volume subaqueous eruption on the Izu arc front. Because of the importance of this discovery, Site U1436 was drilled in three additional holes (U1436B, U1436C, and U1436D), as part of a contingency operation, in an attempt to get better recovery on the black glassy mafic ash layer and its enclosing sediments and to better constrain its thickness.
Publication titleProceedings of the International Ocean Discovery Program
Department/SchoolSchool of Natural Sciences
Rights statementCopyright the Authors. Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0) license https://creativecommons.org/licenses/by/3.0/