Abrupt strike‐slip fault to subduction transition: The Alpine Fault‐Puysegur Trench connection, New Zealand

Lebrun, Jean‐Frédéric; Lamarche, Geoffroy; Collot, Jean‐Yves; Delteil, Jean

doi:10.1029/2000tc900008

Cited by 55 publications

(88 citation statements)

References 45 publications

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“…3, 4). Dextral strike-slip faults are interpreted to be active on the western side of Puysegur Bank, on the basis of bathymetric and seismic data, and by inference from the highly oblique plate motion direction (Melhuish et al 1999;Lebrun et al 2000). Seismic reflection data demonstrate that central and eastern parts of Puysegur Bank are underlain by gently east-dipping sedimentary strata (Fig.…”

Section: Puysegur Bankmentioning

confidence: 99%

Miocene‐Recent deformation, surface elevation, and volcanic intrusion of the overriding plate during subduction initiation, offshore southern Fiordland, Puysegur margin, southwest New Zealand

Sutherland

Barnes

Uruski

2006

New Zealand Journal of Geology and Geophysics

101

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We analyse results of dredge sampling, a high-resolution seismic reflection survey, and unpublished petroleum industry data from part of the overriding continental plate of the Fiordland subduction zone. Plate tectonic calculations show that convergence rates have progressively increased since Miocene time, when subduction-related processes started. An initial deformation phase was characterised by reverse throw on pre-existing structures during the interval 16-8 Ma. This is interpreted to be when a throughgoing subduction interface developed, as fracture zone linkage and spreading ridge extinction occurred south of New Zealand. A Pliocene-Quaternary deformation phase characterised by renewed folding and reverse faulting on structures subparallel to the plate boundary may be due to a regional change in plate motion or the inherited geometry of the Eocene continent/ocean transition that is obliquely colliding with the plate boundary, or both. Initial uplift of the region south of Fiordland to sea level was followed by c. 1800 m of subsidence at the Snares Depression. This subsidence may have been an isostatic response to tectonic erosion of a crustal root, or due to negative slab buoyancy associated with greater total convergence, or both. Persistence of Fiordland topographic elevations above sea level, and continued rock uplift of Fiordland, is likely to be related to greater initial crustal thickness of the overriding Pacific plate in the north, and the present southward transition from continental collision to intra-oceanic subduction. The locations of the first three subduction-related volcanoes have a relationship to pre-existing faults and raise the possibility that volcanism and deformation may be intimately associated during subduction initiation.

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Section: Puysegur Bankmentioning

confidence: 99%

Miocene‐Recent deformation, surface elevation, and volcanic intrusion of the overriding plate during subduction initiation, offshore southern Fiordland, Puysegur margin, southwest New Zealand

Sutherland

Barnes

Uruski

2006

New Zealand Journal of Geology and Geophysics

101

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“…The slab beneath Fiordland has been described as folded downward (42,45) or torn (32,46,47), which may influence patterns of uplift. For example, increased resistance to subduction of the Australian plate due to impingement into a thick, strong continental lithosphere below Otago, east of Fiordland may play a role in driving uplift (42).…”

Section: Alternative Sources Of Upliftmentioning

confidence: 99%

Uplift in the Fiordland Region, New Zealand: Implications for Incipient Subduction

Gurnis

Kamp

Sutherland³

2002

Science

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Provided that exhumation related to subduction initiation removes at least 2-3 km of material, then it may be detected using low temperature thermochronometry. Such techniques yield cooling ages which can be interpreted to reflect the approximate time that a particular rock has passed through the closure temperature of the particular mineral system. Here we rely on helium and fission track ages in apatite. The closure temperature of helium in apatite is roughly 70 ºC (1) We obtained age apatite helium and fission track age pairs for samples from vertical elevation profiles adjacent to central Doubtful Sound and Lake Hauroko, and at Percy Saddle, as well as two transects at sea level along Dusky and Doubtful Sounds, and one lake-level transect along the North Fiord of Lake Te Anau. In addition to these

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“…The fault is continuous for at least 850 km, the southern 230 km of which is submarine, lying west of the Fiordland coast ( Fig. 1A) (Delteil et al, 1996a;Lebrun et al, 2000). Together with related structures at each end of South Island, the Alpine Fault links the opposite-dipping, obliquely convergent Fiordland and Hikurangi subduction zones.…”

Section: Introductionmentioning

confidence: 97%

Strike-slip structure and sedimentary basins of the southern Alpine Fault, Fiordland, New Zealand

Barnes

Sutherland

Delteil

2005

Geol Soc America Bull

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Abrupt strike‐slip fault to subduction transition: The Alpine Fault‐Puysegur Trench connection, New Zealand

Abstract: Abstract.Swath

Cited by 55 publications

References 45 publications

Miocene‐Recent deformation, surface elevation, and volcanic intrusion of the overriding plate during subduction initiation, offshore southern Fiordland, Puysegur margin, southwest New Zealand

Miocene‐Recent deformation, surface elevation, and volcanic intrusion of the overriding plate during subduction initiation, offshore southern Fiordland, Puysegur margin, southwest New Zealand

Uplift in the Fiordland Region, New Zealand: Implications for Incipient Subduction

Strike-slip structure and sedimentary basins of the southern Alpine Fault, Fiordland, New Zealand

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