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Titolo:
Structural evolution and landscape development of a collapsed transpressive duplex on the Hope Fault, North Canterbury, New Zealand
Autore:
Eusden, JD; Pettinga, JR; Campbell, JK;
Indirizzi:
Univ Canterbury, Dept Geol Sci, Nat Hazards Res Ctr, Christchurch 1, New Zealand Univ Canterbury Christchurch New Zealand 1 , Christchurch 1, New Zealand
Titolo Testata:
NEW ZEALAND JOURNAL OF GEOLOGY AND GEOPHYSICS
fascicolo: 3, volume: 43, anno: 2000,
pagine: 391 - 404
SICI:
0028-8306(200009)43:3<391:SEALDO>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
CURRENT PLATE MOTIONS; STRIKE-SLIP; SOUTH ISLAND; DISPLACEMENTS; DEFORMATION; EARTHQUAKE;
Keywords:
Hope Fault; New Zealand; transpressive duplex; landscape evolution;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Eusden, JD Bates Coll, Dept Geol, Lewiston, ME 04240 USA Bates Coll Lewiston ME USA 04240 Geol, Lewiston, ME 04240 USA
Citazione:
J.D. Eusden et al., "Structural evolution and landscape development of a collapsed transpressive duplex on the Hope Fault, North Canterbury, New Zealand", NZ J GEOL, 43(3), 2000, pp. 391-404

Abstract

This study examined the transpressional Conway segment of the Hope Fault in North Canterbury, the fastest moving fault of the Marlborough Fault Zone in northern South Island of New Zealand, in an attempt to reconstruct, via air photograph interpretation, detailed field mapping, and theoretical constraints, the styles of structural geometry of the late Quaternary deformation. We relate the evolving landscape to the development and modification ofthis fault in an active tectonic setting. The section of the fault zone studied is a 13 km long, 1.3 km wide, asymmetric transpressional reverse fault duplex, bounded to the southwest by the Lottery River and to the northeast by the Mason River, which tapers down toa single fault trace to the northeast. Between the bounding faults of the duplex are approximately 100 subsidiary fault scarps that initially formed an imbricate set of footwall propagating reverse/thrust faults. These faults became inactive and topographically unsupported when younger footwall propagating reverse faults migrated northeast along the main trace of the HopeFault as the duplex also migrated to the northeast. The unsupported duplexstructurally collapsed back into the dilating fault zone, causing reversalof slip on the imbricate reverse faults so that they became normal faults. As the duplex collapsed, the adjacent hanging wall was uplifted triggeringlandsliding, rapid incision by streams, formation of large alluvial fans, and minor normal fault gravity collapse structures. The footwall block outside the duplex became rapidly incised by streams and experienced widespreadtopographic slumping and associated structurally controlled, shallow-levelridge renting. Stream dissection of flights of late Pleistocene aggradation/degradation surfaces also occurred at this time, leaving remnant flat-topped hills between the dissected and slumped valleys. Our analysis of the interrelationships between the structural geology and the landscape over timeis a new approach for the Hope Fault and reconfirms the necessity of integrating detailed structural geology with geomorphology in areas of active tectonism.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 09:25:23