Postmagmatic Tectonic Evolution of the Outer Izu-Bonin Forearc Revealed by Sediment Basin Structure and Vein Microstructure Analysis: Implications for a 15 Ma Hiatus Between Pacific Plate Subduction Initiation and Forearc Extension

W Kurz; P Micheuz; G L Christeson; M Reagan; J W Shervais; S Kutterolf; A Robertson; K Krenn; K Michibayashi; D Quandt

doi:10.1029/2019GC008329

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Postmagmatic Tectonic Evolution of the Outer Izu-Bonin Forearc Revealed by Sediment Basin Structure and Vein Microstructure Analysis: Implications for a 15 Ma Hiatus Between Pacific Plate Subduction Initiation and Forearc Extension

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Postmagmatic Tectonic Evolution of the Outer Izu-Bonin Forearc Revealed by Sediment Basin Structure and Vein Microstructure Analysis: Implications for a 15 Ma Hiatus Between Pacific Plate Subduction Initiation and Forearc Extension

W Kurz, P Micheuz, G L Christeson, M Reagan, J W Shervais, S Kutterolf, A Robertson, K Krenn, K Michibayashi and D Quandt

Geochemistry, geophysics, geosystems : G3, Vol.20(12), pp.5867-5895

12/2019

DOI: 10.1029/2019GC008329

PMCID: PMC7004124

PMID: 32055237

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Abstract

International Ocean Discovery Program Expedition 352 recovered sedimentary-volcaniclastic successions and extensional structures (faults and extensional veins) that allow the reconstruction of the Izu-Bonin forearc tectonic evolution using a combination of shipboard core data, seismic reflection images, and calcite vein microstructure analysis. The oldest recorded biostratigraphic ages within fault-bounded sedimentary basins (Late Eocene to Early Oligocene) imply a ~15 Ma hiatus between the formation of the igneous basement (52 to 50 Ma) and the onset of sedimentation. At the upslope sites (U1439 and U1442) extension led to the formation of asymmetric basins reflecting regional stretch of ~16-19% at strain rates of ~1.58 × 10 to 4.62 × 10 s . Downslope Site U1440 (closer to the trench) is characterized by a symmetric graben bounded by conjugate normal faults reflecting regional stretch of ~55% at strain rates of 4.40 × 10 to 1.43 × 10 s . Mean differential stresses are in the range of ~70-90 MPa. We infer that upper plate extension was triggered by incipient Pacific Plate rollback ~15 Ma after subduction initiation. Extension was accommodated by normal faulting with syntectonic sedimentation during Late Eocene to Early Oligocene times. Backarc extension was assisted by magmatism with related Shikoku and Parece-Vela Basin spreading at ~25 Ma, so that parts of the arc and rear arc, and the West Philippine backarc Basin were dismembered from the forearc. This was followed by slow-rift to postrift sedimentation during the transition from forearc to arc rifting to spreading within the Shikoku-Parece-Vela Basin system.

faulting and extension

Expedition 352

International Ocean Discovery Program (IODP)

Izu ‐ Bonin forearc

syntectonic sedimentation

hiatus

Details

Title: Subtitle: Postmagmatic Tectonic Evolution of the Outer Izu-Bonin Forearc Revealed by Sediment Basin Structure and Vein Microstructure Analysis: Implications for a 15 Ma Hiatus Between Pacific Plate Subduction Initiation and Forearc Extension
Creators: W Kurz - University of Graz
P Micheuz - University of Graz
G L Christeson - The University of Texas at Austin
M Reagan - University of Iowa
J W Shervais - Utah State University
S Kutterolf - GEOMAR Helmholtz Centre for Ocean Research Kiel
A Robertson - University of Edinburgh
K Krenn - University of Graz
K Michibayashi - Nagoya University
D Quandt - University of Graz
Resource Type: Journal article
Publication Details: Geochemistry, geophysics, geosystems : G3, Vol.20(12), pp.5867-5895
DOI: 10.1029/2019GC008329
PMID: 32055237
PMCID: PMC7004124
NLM abbreviation: Geochem Geophys Geosyst
ISSN: 1525-2027
eISSN: 1525-2027
Grant note: DOI: 10.13039/501100002428, name: Austrian Science Fund; DOI: 10.13039/100000001, name: National Science Foundation, award: OCE‐1558647, OCE‐1558689; DOI: 10.13039/501100001691, name: Japan Society for the Promotion of Science; DOI: 10.13039/501100008982, name: National Science Foundation; DOI: 10.13039/100005198, name: Consortium for Ocean Leadership; DOI: 10.13039/501100001659, name: Deutsche Forschungsgemeinschaft, award: KU2685/4‐1; DOI: 10.13039/501100002428, name: Austrian Science Fund, award: FWF‐P 27982‐N29
Language: English
Date published: 12/2019
Academic Unit: Earth and Environmental Sciences
Record Identifier: 9984229292402771

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