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Strain partitioning across a subduction thrust fault near the deformation front of the Hikurangi subduction margin, New Zealand: A magnetic fabric study on IODP Expedition 375 Site U1518

Greve, A.; Kars, M.; Zerbst, L.; Stipp, M.; Hashimoto, Y.

Understanding the distribution of strain along thrust and splay faults in active accretionary systems is crucial to understand the mechanical properties of the sediments and the strength of the fault zone and its slip behavior. This paper investigates the distribution of strain through sediment compaction and texture development across the Pāpaku fault, a major splay fault near the deformation front of the Hikurangi subduction margin, New Zealand using the anisotropy of magnetic susceptibility technique (AMS). International Ocean Discovery Program Site U1518 penetrated hanging wall, fault zone and footwall sequences to a maximum depth of 484.9 meters below seafloor. A total of 330 discrete samples was subjected to AMS measurements and magnetic remanence data used to reconstruct the axial orientation of each sample in a geographic reference frame. The AMS display distinct fabric differences between hanging wall, through the fault zone and footwall domains, demonstrating that strain is partitioned across the fault zone. Hanging wall sequences show a strike-parallel northeasterly lineation of K$_{max}$ and weakly prolate shapes, typical for a component of northeast-southwest lateral shortening. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000120375
Veröffentlicht am 29.06.2020
DOI: 10.1016/j.epsl.2020.116322
Zitationen: 4
Web of Science
Zitationen: 4
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Geophysikalisches Institut (GPI)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 15.07.2020
Sprache Englisch
Identifikator ISSN: 0012-821X, 1385-013X
KITopen-ID: 1000120375
Erschienen in Earth and planetary science letters
Verlag Elsevier
Band 542
Seiten Art. Nr.: 116322
Schlagwörter Hikurangi subduction margin, IODP Expedition 375, anisotropy of magnetic susceptibility, strain partitioning, accretionary system, soft sediment deformation
Nachgewiesen in Dimensions
Web of Science
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