Tectonic compaction shortening in toe region of isolated listric normal fault, North Taranaki Basin, New Zealand

© 2016 The Authors. Basin Research © 2016 John Wiley & Sons Ltd, European Association of Geoscientists & Engineers and International Association of Sedimentologists. Industry 2D and 3D seismic data across the North Taranaki Basin displays two listric normal faults that formed during Plio...

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Main Authors: Chris K. Morley, Diako Hariri Naghadeh
Format: Journal
Published: 2018
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http://cmuir.cmu.ac.th/jspui/handle/6653943832/58634
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spelling th-cmuir.6653943832-586342018-09-05T04:27:13Z Tectonic compaction shortening in toe region of isolated listric normal fault, North Taranaki Basin, New Zealand Chris K. Morley Diako Hariri Naghadeh Earth and Planetary Sciences © 2016 The Authors. Basin Research © 2016 John Wiley & Sons Ltd, European Association of Geoscientists & Engineers and International Association of Sedimentologists. Industry 2D and 3D seismic data across the North Taranaki Basin displays two listric normal faults that formed during Pliocene shelf edge clinoform progradation. The faults die out in the down-transport direction with no evidence for contractional structures, except for two small thrust faults in one narrow zone. When active, the detachments lay at depths of about 1000 m below the seafloor. The overlying section had high initial porosities (30–60%). It is estimated that loss of about 17–20% pore volume by lateral compaction, and fluid expulsion over a distance of about 4–6 km in the transport direction occurred in place of folding and thrusting. Seismic and well evidence for abnormally highly compacted shales suggests there is about 6% less porosity than expected for in the prekinematic section, which possibly represents a residual of the porosity anomaly caused by lateral compaction. The observations indicate significant shortening (~20%) by lateral compaction and probably some layer parallel thickening are important deformation mechanisms in near-surface deepwater sediments that needs to be incorporated into shortening estimates and ‘balanced’ cross-sections. A key factor in listric fault initiation near the base of slope is inferred to be transient, increased pore fluid pressure due to lateral expulsion of fluids from beneath the prograding Giant Foresets Formation. 2018-09-05T04:27:13Z 2018-09-05T04:27:13Z 2018-02-01 Journal 13652117 0950091X 2-s2.0-85011294875 10.1111/bre.12227 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85011294875&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/58634
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
topic Earth and Planetary Sciences
spellingShingle Earth and Planetary Sciences
Chris K. Morley
Diako Hariri Naghadeh
Tectonic compaction shortening in toe region of isolated listric normal fault, North Taranaki Basin, New Zealand
description © 2016 The Authors. Basin Research © 2016 John Wiley & Sons Ltd, European Association of Geoscientists & Engineers and International Association of Sedimentologists. Industry 2D and 3D seismic data across the North Taranaki Basin displays two listric normal faults that formed during Pliocene shelf edge clinoform progradation. The faults die out in the down-transport direction with no evidence for contractional structures, except for two small thrust faults in one narrow zone. When active, the detachments lay at depths of about 1000 m below the seafloor. The overlying section had high initial porosities (30–60%). It is estimated that loss of about 17–20% pore volume by lateral compaction, and fluid expulsion over a distance of about 4–6 km in the transport direction occurred in place of folding and thrusting. Seismic and well evidence for abnormally highly compacted shales suggests there is about 6% less porosity than expected for in the prekinematic section, which possibly represents a residual of the porosity anomaly caused by lateral compaction. The observations indicate significant shortening (~20%) by lateral compaction and probably some layer parallel thickening are important deformation mechanisms in near-surface deepwater sediments that needs to be incorporated into shortening estimates and ‘balanced’ cross-sections. A key factor in listric fault initiation near the base of slope is inferred to be transient, increased pore fluid pressure due to lateral expulsion of fluids from beneath the prograding Giant Foresets Formation.
format Journal
author Chris K. Morley
Diako Hariri Naghadeh
author_facet Chris K. Morley
Diako Hariri Naghadeh
author_sort Chris K. Morley
title Tectonic compaction shortening in toe region of isolated listric normal fault, North Taranaki Basin, New Zealand
title_short Tectonic compaction shortening in toe region of isolated listric normal fault, North Taranaki Basin, New Zealand
title_full Tectonic compaction shortening in toe region of isolated listric normal fault, North Taranaki Basin, New Zealand
title_fullStr Tectonic compaction shortening in toe region of isolated listric normal fault, North Taranaki Basin, New Zealand
title_full_unstemmed Tectonic compaction shortening in toe region of isolated listric normal fault, North Taranaki Basin, New Zealand
title_sort tectonic compaction shortening in toe region of isolated listric normal fault, north taranaki basin, new zealand
publishDate 2018
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85011294875&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/58634
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