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Mixed deformation styles on a shallow subduction thrust, Hikurangi margin, New Zealand

Fagereng, A, Savage, H, Morgan, J, Wang, M, Meneghini, F, Barnes, P, Bell, R, Kitajima, H, McNamara, D, Saffer, D, Wallace, L, Petronotis, K and LeVay, L 2019. Mixed deformation styles on a shallow subduction thrust, Hikurangi margin, New Zealand. Geology 47 (9) , pp. 872-876. 10.1130/G46367.1

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Abstract

Geophysical observations show spatial and temporal variations in fault slip style on shallow subduction thrust faults, but geological signatures and underlying deformation processes remain poorly understood. International Ocean Discovery Program (IODP) Expeditions 372 and 375 investigated New Zealand’s Hikurangi margin in a region that has experienced both tsunami earthquakes and repeated slow-slip events. We report direct observations from cores that sampled the active Pāpaku splay fault at 304 m below the seafloor. This fault roots into the plate interface and comprises an 18-m-thick main fault underlain by ∼30 m of less intensely deformed footwall and an ∼10-m-thick subsidiary fault above undeformed footwall. Fault zone structures include breccias, folds, and asymmetric clasts within transposed and/or dismembered, relatively homogeneous, silty hemipelagic sediments. The data demonstrate that the fault has experienced both ductile and brittle deformation. This structural variation indicates that a range of local slip speeds can occur along shallow faults, and they are controlled by temporal, potentially far-field, changes in strain rate or effective stress.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Publisher: Geological Society of America
ISSN: 0091-7613
Date of First Compliant Deposit: 15 July 2019
Date of Acceptance: 26 June 2019
Last Modified: 09 Sep 2019 13:21
URI: http://orca-mwe.cf.ac.uk/id/eprint/124228

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