Bending within the axial tectonic belt of New Zealand in the last 9 Myr from paleomagnetic data

Walcott, R. I.; Christoffel, David; Mumme, T. C.

doi:10.1016/0012-821x(81)90195-3

Cited by 46 publications

(31 citation statements)

References 8 publications

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“…An appealing solution suggested by Molnar et al (1975) is that the Eocene geometry of the Maitai Terrane was a smooth curve through New Zealand. This hypothesis is consistent with geological evidence of deformation east of the Alpine Fault (e.g., Carter & Norris 1976;Norris 1979;Norris & Turnbull 1993;Little & Roberts 1997), paleomagnetic data (Walcott et al 1981;Little & Roberts 1997), and supported by the pattern of contemporary strain (Walcott 1984;Beavan et al in press). Geological evidence west of the Alpine Fault is equivocal and has been used to argue that most bending of terranes occurred before 45 Ma (e.g., Kamp 1987;Bradshaw et al 1996).…”

Section: Ma (Late Eocene) Reconstructionsupporting

confidence: 68%

“…of distributed dextral shear at the Cenozoic plate boundary (e.g., Walcott et al 1981;Walcott 1984;Wilson & McGuire 1995;Little & Roberts 1997). If only a small proportion of this curvature formed since 45 Ma (cf.…”

Section: Ma (Late Eocene) Reconstructionmentioning

confidence: 99%

“…Since the analysis by Harold Wellman in 1949(in Benson 1952, the history of movement on the Alpine Fault, and the timing and amount of bending of New Zealand basement terranes, have been two of the most widely debated subjects in the published literature on New Zealand geology (e.g., Kingma 1959;Suggate 1963;Wellman 1971;Molnar et al 1975;Carter & Norris 1976;Walcott et al 1981;Walcott 1984Walcott , 1998Kamp 1987;Gray & Norton 1988;Lamb & Bibby 1989;Vickery & Lamb 1995;Bradshaw et al 1996;Little & Roberts 1997). Much of this debate is concerned with the relative importance of Cretaceous versus Cenozoic crustal deformation, and the relative contributions and timing of faulting, distributed shear, and local rotations.…”

Section: Introductionmentioning

confidence: 99%

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Cenozoic bending of New Zealand basement terranes and Alpine Fault displacement: A brief review

Sutherland¹

1999

New Zealand Journal of Geology and Geophysics

149

181

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It is now possible to accurately reconstruct late Eocene-Recent positions of the Australian plate with respect to the Pacific plate. Rates of plate displacement through New Zealand were slow in Eocene-Oligocene time, and increased rapidly in Miocene time as the pole of rotation migrated southeast. Reconstruction of Maitai Terrane rocks suggests they had a smooth and continuously curved geometry through New Zealand in late Eocene time, which was probably similar to their Late Cretaceous configuration. This analysis implies that most or all Alpine Fault offset occurred after 45 Ma, and suggests about half the Eocene-Recent plate displacement was partitioned onto the Alpine Fault, and half was accommodated by distributed crustal shear. Estimates of Pliocene and Quaternary Alpine Fault displacement rate suggest the proportion of plate boundary displacement partitioned onto the Alpine Fault may have increased with time, displacement rate, and total displacement.

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Section: Ma (Late Eocene) Reconstructionsupporting

confidence: 68%

Section: Ma (Late Eocene) Reconstructionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cenozoic bending of New Zealand basement terranes and Alpine Fault displacement: A brief review

Sutherland¹

1999

New Zealand Journal of Geology and Geophysics

149

181

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“…7, the Blind River anomaly, ill) = 36 ± 4 0 , if assigned an age of 5 m.y., lies just above the best fitting line of Wright & Walcott (1986) for the northern region. Our anomaly is somewhat greater than two previously reported results from older Tongaporutuan sediments, at Hinakura Road, Wairarapa, southern North Island (~D = 30 ± 8°) and Cape Campbell, northern South Island (ill) = 20 ± 11°) (Walcott et al 1981).…”

Section: Tectonic Rotationscontrasting

confidence: 54%

New paleomagnetic results from Blind River: Revised magnetostratigraphy and tectonic rotation of the Marlborough region, South Island, New Zealand

Turner

Roberts

Làj³

et al. 1989

New Zealand Journal of Geology and Geophysics

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Part of the Upper Miocene-Lower Pliocene mudstone section at Blind River, northern Marlborough, which was the subject of a paleomagnetic study by Kennett and Watkins in 1974, has been resampled and the data reinterpreted. The new results do not concur entirely with those of Kennett and Watkins. In particular, we do not find the uppermost normal event of their record. This implies a more uniform deposition rate and a later date of 5.6 m.y. for the first occurrence of Globorotalia conomiozea in the section.The new data also show a declination anomaly of 36 ± 4° to the east. This is thought to be due to clockwise rotation within the active tectonic belt of New Zealand, between the Pacific and Australian plates. This declination anomaly is slightly larger than those reported from sites in the northern part of the tectonic belt, suggesting thatthedeformation is more complex than a simple block rotation.

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“…1). The frontal ridge is bounded to the east by a complex region of folding and faulting named the East Coast deformed belt by Sporli (1980; see also Katz, 1974Katz, , 1982Walcott, 1978a;Lewis, 1980;Cole and Lewis, 1981;Walcott et al;.…”

Section: Introductionmentioning

confidence: 99%

Basement-cover relationships and tectonic significance of Mt Miroroa, western Hawke's Bay

Browne¹

1986

Journal of the Royal Society of New Zealand

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At Mt Miroroa , indurated Mesozoic basement rocks have been faulted over Late Tertiary alternating marine sandstone, siltstone and pebbly limestone. The fault plane strikes NW-SE and dips at 45°SW. The younger sediments are flat lying to the north, but towards the Miroroa Fault they are steepened on the southern limb of an ESE trending syncline, and in places arc overturned. The 3 km long Miroroa Fault is truncated by the northeast-trending Ruahine and Comet Faults. Considerable deformation is evident above and below the Miroroa Fault, although the shear plane is only 5 cm thick. Topographically bclow but subparallel to the Miroroa Fault, several normal faults have raised horst wedges of basement rocks into the Late Tertiary strata.Conjugate minor fault couples immediately below the decollement indicate maximum principal stress to be low-angle and oriented NE-SW. Strain ellipsoids constructed from deformed fossils beneath the Miroroa Fault confirm this orientation. Conjugate faults within a 10 km radius north of the fault indicate NE-SW shortening directions with a subordinate easterly component.In terms of plate tectonic nomenclature, Mt Miroroa lies within the frontal ridge. Sites elsewhere in the frontal ridge of the North Island also indicate NE shortening. It is suggested that the Miroroa Fault either (1) began as a northwest trending normal fault, that was subsequently overturned to its present-day reverse geometry by continued NE-SW directed compression, or (2) developed as an en echelon or side stepping fault between the adjacent Cornet and Ruahine Faults.

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Bending within the axial tectonic belt of New Zealand in the last 9 Myr from paleomagnetic data

Cited by 46 publications

References 8 publications

Cenozoic bending of New Zealand basement terranes and Alpine Fault displacement: A brief review

Cenozoic bending of New Zealand basement terranes and Alpine Fault displacement: A brief review

New paleomagnetic results from Blind River: Revised magnetostratigraphy and tectonic rotation of the Marlborough region, South Island, New Zealand

Basement-cover relationships and tectonic significance of Mt Miroroa, western Hawke's Bay

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