The last 2 Myr of accretionary wedge construction in the central Hikurangi margin (North Island, New Zealand): Insights from structural modeling
Source: doi:10.1002/2016GC006341 Three depth-converted and geologically interpreted seismic profiles provide a clear image of the offshore outer accretionary wedge associated with oblique subduction of the Pacific Plate beneath the central Hikurangi margin. Plio-Quaternary turbidites deposited over...
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Online Access: | https://hdl.handle.net/10037/10587 https://doi.org/10.1002/2016GC006341 |
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ftunivtroemsoe:oai:munin.uit.no:10037/10587 2023-05-15T14:27:28+02:00 The last 2 Myr of accretionary wedge construction in the central Hikurangi margin (North Island, New Zealand): Insights from structural modeling Ghisetti, Francesca C. Barnes, Philip M. Ellis, Susan Plaza-Faverola, Andreia Barker, Daniel H.N. 2016-07-17 https://hdl.handle.net/10037/10587 https://doi.org/10.1002/2016GC006341 eng eng American Geophysical Union Geochemistry Geophysics Geosystems info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE Ghisetti, F. C., P. M. Barnes, S. Ellis, A. A. Plaza-Faverola, and D. H. N. Barker (2016), The last 2 Myr of accretionary wedge construction in the central Hikurangi margin (North Island, New Zealand): Insights from structural modeling, Geochem. Geophys. Geosyst., 17, 2661–2686, doi:10.1002/2016GC006341 FRIDAID 1369389 doi:10.1002/2016GC006341 1525-2027 https://hdl.handle.net/10037/10587 openAccess VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 Journal article Tidsskriftartikkel Peer reviewed 2016 ftunivtroemsoe https://doi.org/10.1002/2016GC006341 2021-06-25T17:55:08Z Source: doi:10.1002/2016GC006341 Three depth-converted and geologically interpreted seismic profiles provide a clear image of the offshore outer accretionary wedge associated with oblique subduction of the Pacific Plate beneath the central Hikurangi margin. Plio-Quaternary turbidites deposited over the pelagic cover sequence of the Hikurangi Plateau have been accreted to the margin by imbrication along E-verging thrust faults that propagated up-section from the plate boundary décollement. Growth stratigraphy of piggy-back basins and thrusting of progressively younger horizons trace the eastward advance of the leading thrust front over ∼60 km in the last 2 Myr. Moderate internal shortening of fault-bounded blocks typically 4–8 km wide reflects rapid creation of thrust faults, with some early formed faults undergoing out-of-sequence reactivation to maintain critical wedge taper. Multistage structural restorations show that forward progression of shortening involves: (1) initial development of a ∼10–25 km wide “proto-thrust” zone, comprising conjugate sets of moderately to steeply dipping low-displacement (∼10–100 m) reverse faults; and (2) growth of thrust faults that exploit some of the early proto-thrust faults and propagate up-section with progressive break-through of folds localized above the fault tips. The youngest, still unbreached folds deform the present-day seafloor. Progressive retro-deformations show that macroscopic thrust faults and folds account for less than 50% of the margin-perpendicular shortening imposed by plate convergence. Arguably, significant fractions of the missing components can be attributed to mesoscopic and microscopic scale layer-parallel shortening within the wedge, in the proto-thrust zones, and in the outer décollement zone. Article in Journal/Newspaper Arctic University of Tromsø: Munin Open Research Archive New Zealand Pacific Geochemistry, Geophysics, Geosystems 17 7 2661 2686 |
institution |
Open Polar |
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University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 Ghisetti, Francesca C. Barnes, Philip M. Ellis, Susan Plaza-Faverola, Andreia Barker, Daniel H.N. The last 2 Myr of accretionary wedge construction in the central Hikurangi margin (North Island, New Zealand): Insights from structural modeling |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 |
description |
Source: doi:10.1002/2016GC006341 Three depth-converted and geologically interpreted seismic profiles provide a clear image of the offshore outer accretionary wedge associated with oblique subduction of the Pacific Plate beneath the central Hikurangi margin. Plio-Quaternary turbidites deposited over the pelagic cover sequence of the Hikurangi Plateau have been accreted to the margin by imbrication along E-verging thrust faults that propagated up-section from the plate boundary décollement. Growth stratigraphy of piggy-back basins and thrusting of progressively younger horizons trace the eastward advance of the leading thrust front over ∼60 km in the last 2 Myr. Moderate internal shortening of fault-bounded blocks typically 4–8 km wide reflects rapid creation of thrust faults, with some early formed faults undergoing out-of-sequence reactivation to maintain critical wedge taper. Multistage structural restorations show that forward progression of shortening involves: (1) initial development of a ∼10–25 km wide “proto-thrust” zone, comprising conjugate sets of moderately to steeply dipping low-displacement (∼10–100 m) reverse faults; and (2) growth of thrust faults that exploit some of the early proto-thrust faults and propagate up-section with progressive break-through of folds localized above the fault tips. The youngest, still unbreached folds deform the present-day seafloor. Progressive retro-deformations show that macroscopic thrust faults and folds account for less than 50% of the margin-perpendicular shortening imposed by plate convergence. Arguably, significant fractions of the missing components can be attributed to mesoscopic and microscopic scale layer-parallel shortening within the wedge, in the proto-thrust zones, and in the outer décollement zone. |
format |
Article in Journal/Newspaper |
author |
Ghisetti, Francesca C. Barnes, Philip M. Ellis, Susan Plaza-Faverola, Andreia Barker, Daniel H.N. |
author_facet |
Ghisetti, Francesca C. Barnes, Philip M. Ellis, Susan Plaza-Faverola, Andreia Barker, Daniel H.N. |
author_sort |
Ghisetti, Francesca C. |
title |
The last 2 Myr of accretionary wedge construction in the central Hikurangi margin (North Island, New Zealand): Insights from structural modeling |
title_short |
The last 2 Myr of accretionary wedge construction in the central Hikurangi margin (North Island, New Zealand): Insights from structural modeling |
title_full |
The last 2 Myr of accretionary wedge construction in the central Hikurangi margin (North Island, New Zealand): Insights from structural modeling |
title_fullStr |
The last 2 Myr of accretionary wedge construction in the central Hikurangi margin (North Island, New Zealand): Insights from structural modeling |
title_full_unstemmed |
The last 2 Myr of accretionary wedge construction in the central Hikurangi margin (North Island, New Zealand): Insights from structural modeling |
title_sort |
last 2 myr of accretionary wedge construction in the central hikurangi margin (north island, new zealand): insights from structural modeling |
publisher |
American Geophysical Union |
publishDate |
2016 |
url |
https://hdl.handle.net/10037/10587 https://doi.org/10.1002/2016GC006341 |
geographic |
New Zealand Pacific |
geographic_facet |
New Zealand Pacific |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
Geochemistry Geophysics Geosystems info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE Ghisetti, F. C., P. M. Barnes, S. Ellis, A. A. Plaza-Faverola, and D. H. N. Barker (2016), The last 2 Myr of accretionary wedge construction in the central Hikurangi margin (North Island, New Zealand): Insights from structural modeling, Geochem. Geophys. Geosyst., 17, 2661–2686, doi:10.1002/2016GC006341 FRIDAID 1369389 doi:10.1002/2016GC006341 1525-2027 https://hdl.handle.net/10037/10587 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1002/2016GC006341 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
17 |
container_issue |
7 |
container_start_page |
2661 |
op_container_end_page |
2686 |
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1766301235178110976 |