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Titolo:
Quaternary faulting in the offshore Flaxbourne and Wairarapa Basins, southern Cook Strait, New Zealand
Autore:
Barnes, PM; Audru, JC;
Indirizzi:
Natl Inst Water & Atmospher Res, Wellington, New Zealand Natl Inst Water &Atmospher Res Wellington New Zealand ton, New Zealand Univ Nice, UMR Geosci Azur, F-06560 Valbonne, France Univ Nice Valbonne France F-06560 Geosci Azur, F-06560 Valbonne, France
Titolo Testata:
NEW ZEALAND JOURNAL OF GEOLOGY AND GEOPHYSICS
fascicolo: 3, volume: 42, anno: 1999,
pagine: 349 - 367
SICI:
0028-8306(199909)42:3<349:QFITOF>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
PLATE-BOUNDARY ZONE; HIKURANGI MARGIN; SEISMIC-REFLECTION; PACIFIC PLATE; HOPE FAULT; OBLIQUE SUBDUCTION; WELLINGTON REGION; NORTH CANTERBURY; STRIKE-SLIP; ISLAND;
Keywords:
Cook Strait; Marlborough; Wairarapa; plate boundary; tectonic; faulting; structure; Quaternary; seismic reflection; bathymetry; stratigraphy; sedimentary basins;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
60
Recensione:
Indirizzi per estratti:
Indirizzo: Barnes, PM Natl Inst Water & Atmospher Res, POB 14901, Wellington, New Zealand Natl Inst Water & Atmospher Res POB 14901 Wellington New Zealand
Citazione:
P.M. Barnes e J.C. Audru, "Quaternary faulting in the offshore Flaxbourne and Wairarapa Basins, southern Cook Strait, New Zealand", NZ J GEOL, 42(3), 1999, pp. 349-367

Abstract

Marine seismic reflection profiles, bathymetric data, and seabed samples reveal the stratigraphy and Quaternary structure of the southern Wairarapa and Flaxbourne Basins in southeastern Cook Strait and eastern Marlborough. These SW-NE-trending basins began forming before the late Miocene (>10 Ma), but their development has been mainly during and since that time and continues today within the Pacific-Australia plate boundary zone. Recently activestructures deforming and bounding the basins are recognised by growth strata and deformation of Quaternary sediments. Observed structural geometries reflect Pliocene-Recent changes in the kinematics of faulting in central New Zealand. The 12-22 km wide southern Wairarapa Basin contains up to c. 2.9km of strata and is deforming between offshore segments of the dextral strike-slip Wairarapa Fault and associated Wharekauhau Thrust on the western margin, and offshore extensions of the Aorangi Mountains range-front reversefaults on the eastern margin. To the southwest, in the eastern MarlboroughFault System, the 15-20 km wide, 80 km long Flaxbourne Basin contains >4.5km of strata and is deforming by strike-slip and oblique-slip faults including offshore sections of the Hope and Kekerengu Faults. A new set of strike-slip faults, probably younger than 1 Ma, strike parallel (c. 080 +/- 10 degrees) to the current Pacific-Australian plate motion vector and obliquelyto inherited structural trends. Three of these faults are possibly separating the Flaxbourne and Wairarapa Basins in central, southern Cook Strait. Curved traces of the Needles and Wairarapa Faults on the western margins of the basins are aligned, and may cut across disrupted Miocene structures to link part of the eastern Marlborough Fault System with the North Island Dextral Fault Belt.

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Documento generato il 28/01/20 alle ore 15:00:49