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- W2912254389 abstract "Research Article| January 31, 2019 Evolution of a rapidly slipping, active low-angle normal fault, Suckling-Dayman metamorphic core complex, SE Papua New Guinea Timothy A. Little; Timothy A. Little † 1School of Geography, Environment & Earth Sciences, Victoria University of Wellington, P.O. Box 600, Wellington 6040, New Zealand †tim.little@vuw.ac.nz Search for other works by this author on: GSW Google Scholar S.M. Webber; S.M. Webber 1School of Geography, Environment & Earth Sciences, Victoria University of Wellington, P.O. Box 600, Wellington 6040, New Zealand Search for other works by this author on: GSW Google Scholar M. Mizera; M. Mizera 1School of Geography, Environment & Earth Sciences, Victoria University of Wellington, P.O. Box 600, Wellington 6040, New Zealand Search for other works by this author on: GSW Google Scholar C. Boulton; C. Boulton 1School of Geography, Environment & Earth Sciences, Victoria University of Wellington, P.O. Box 600, Wellington 6040, New Zealand Search for other works by this author on: GSW Google Scholar J. Oesterle; J. Oesterle 1School of Geography, Environment & Earth Sciences, Victoria University of Wellington, P.O. Box 600, Wellington 6040, New Zealand Search for other works by this author on: GSW Google Scholar S. Ellis; S. Ellis 2GNS Science, P.O. Box 30-368, Lower Hutt 5040, New Zealand Search for other works by this author on: GSW Google Scholar A. Boles; A. Boles 3Department of Earth and Environmental Sciences, University of Michigan, 1100 North University Avenue, Ann Arbor, Michigan 48109-1005, USA Search for other works by this author on: GSW Google Scholar B. van der Pluijm; B. van der Pluijm 3Department of Earth and Environmental Sciences, University of Michigan, 1100 North University Avenue, Ann Arbor, Michigan 48109-1005, USA Search for other works by this author on: GSW Google Scholar K. Norton; K. Norton 1School of Geography, Environment & Earth Sciences, Victoria University of Wellington, P.O. Box 600, Wellington 6040, New Zealand Search for other works by this author on: GSW Google Scholar D. Seward; D. Seward 1School of Geography, Environment & Earth Sciences, Victoria University of Wellington, P.O. Box 600, Wellington 6040, New Zealand Search for other works by this author on: GSW Google Scholar J. Biemiller; J. Biemiller 4Institute for Geophysics, University of Texas at Austin, 10601 Exploration Way, Austin, Texas 78758, USA Search for other works by this author on: GSW Google Scholar L. Wallace L. Wallace 2GNS Science, P.O. Box 30-368, Lower Hutt 5040, New Zealand4Institute for Geophysics, University of Texas at Austin, 10601 Exploration Way, Austin, Texas 78758, USA Search for other works by this author on: GSW Google Scholar GSA Bulletin (2019) 131 (7-8): 1333–1363. https://doi.org/10.1130/B35051.1 Article history received: 28 May 2018 rev-recd: 31 Jul 2018 accepted: 29 Oct 2018 first online: 31 Jan 2019 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Timothy A. Little, S.M. Webber, M. Mizera, C. Boulton, J. Oesterle, S. Ellis, A. Boles, B. van der Pluijm, K. Norton, D. Seward, J. Biemiller, L. Wallace; Evolution of a rapidly slipping, active low-angle normal fault, Suckling-Dayman metamorphic core complex, SE Papua New Guinea. GSA Bulletin 2019;; 131 (7-8): 1333–1363. doi: https://doi.org/10.1130/B35051.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The active Mai’iu low-angle normal fault in the Woodlark rift dips as low as 16°–20° at the surface and has formed by extensional inversion of the Paleogene Owen-Stanley thrust fault. The Mai’iu fault has slipped at centimeter-per-year rates for at least 3.3 m.y., in the process exhuming a >29 km width of a largely uneroded fault surface, and uplifting the Suckling-Dayman metamorphic core complex to elevations up to 3.7 km. The exhumed fault surface is overlain by one rider block. This formed where the main fault locally became so shallowly dipping in a synformal megacorrugation that it was no longer frictionally viable for slip. Tectonic geomorphology, structural geology, and microseismicity provide evidence for a convex-upward shape and rolling hinge style of evolution for this strongly back-warped normal fault, and for an approximately Andersonian state of stress in the footwall at depth. Flexure of the exhuming footwall as a result of tectonic unloading apparently caused a late increment of extension-parallel horizontal contraction, together with a constrictional stress state. During exhumation, fault megacorrugations amplified as folds—even in the near surface.Glassy pseudotachylytes in a meter-thick foliated cataclasite unit yield 40Ar/39Ar maximum ages of 2.2–3.0 Ma. The pseudotachylytes and interleaved ultracataclasites developed in a zone of mixed-mode seismic/aseismic slip behavior that formed near the brittle-ductile transition along a frictionally strong, high-stress ramp at 10–12 km depth. The exhumed mafic mylonite zone narrows upward and probably deformed at strain rates of up to 2.1 × 10–10 s–1 in its narrowest, upper part. Observed microseismicity at 10–25 km depth attests to current (interseismic) fault activity downdip of the fault trace. Rolling-hinge–style deformation causes the Mai’iu fault to dip at low angles (<22°) in the near surface. The shallowest part of the Mai’iu fault contains abundant saponite and is thus probably weak enough (µ <0.2) to slip at such a poorly oriented fault dip. At depth, this microseismically active structure slips at moderate dip angles (dip 30°–40°) akin to conventional normal faults. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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- W2912254389 date "2019-01-31" @default.
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- W2912254389 title "Evolution of a rapidly slipping, active low-angle normal fault, Suckling-Dayman metamorphic core complex, SE Papua New Guinea" @default.
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