Deciphering basinal records of intraoceanic arc evolution; core is key

Online Access: Get full text
doi: 10.1130/abs/2016CD-274436
Author(s): Marsaglia, Kathleen M.; Johnson, Kyle; Waldman, Ryan
Author Affiliation(s): Primary:
California State University at Northridge, Department of Geological Sciences, Northridge, CA, United States
Volume Title: Geological Society of America, Cordilleran Section, 112th annual meeting
Source: Abstracts with Programs - Geological Society of America, 48(4); Geological Society of America, Cordilleran Section, 112th annual meeting, Ontario, CA, April 4-6, 2016. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0016-7592 CODEN: GAAPBC
Note: In English
Summary: The history of intraoceanic magmatic arcs, from their birth to their demise, is recorded in the fragmental volcanic debris shed into associated marine basins. There are several potential sedimentary deposit-generating mechanisms in arc-proximal submarine apron to distal deep-marine settings: 1) primary ash falls; 2) volcanic-eruption-generated flows; 3) volcano-sector-collapse-generated flows; 4) seismic-shock-generated flows; 5) hurricane/typhoon-generated flows; 6) debris flows and slumps generated by fault movement; and 7) syndepositional magmatism. Larger-scale submarine deposit geometries and associated facies are related to the generating mechanisms: ash drape, submarine volcanic apron, submarine fan, channel fill, and slump to debris-flow sheets/blankets that taper away from the volcanic center. Another potential control on sediment input is eustasy, which determines the areal extent of arc edifice exposure and erosion. We illustrate some of the products of these processes using ocean drilling cores recovered in the Izu-Bonin system on Ocean Drilling Program Leg 126 and on Ocean Discovery Program Expedition 351 (Site U1438). In combination, these drilling expeditions recovered a nearly complete record of Izu-Bonin arc sedimentation including coeval Oligocene forearc/backarc successions and, at Site U1438, an Eocene sedimentary record extending back to arc inception. These cores offer unprecedented insight into intraoceanic arc evolution.
Year of Publication: 2016
Research Program: IODP Integrated Ocean Drilling Program
IODP2 International Ocean Discovery Program
ODP Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; Basins; Cenozoic; Eocene; Expedition 351; IODP Site U1438; International Ocean Discovery Program; Island arcs; Izu-Bonin Arc; Leg 126; North Pacific; Northwest Pacific; Ocean Drilling Program; Oligocene; Pacific Ocean; Paleogene; Philippine Sea; Sedimentary basins; Tertiary; West Pacific
Coordinates: N305457 N322359 E1405317 E1395039
N272300 N272300 E1341900 E1341900
Record ID: 2016070743
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States