Macquarie ridge-New Zealand alpine fault transition

Christoffel, David; Linden, Willem J. M. van der

doi:10.1029/ar019p0235

Cited by 43 publications

(28 citation statements)

References 8 publications

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“…proposed by Christoffel and Van der Linden (1972), invoking a break in the subducted plate to achieve the steep dip and tight "bending" also suggested by Davey and Smith (1983). The bending is consistent with subducted plates losing most of their strength inboard of the trench (Billen and Gurnis, 2005).…”

Section: Structure Of the Orogensupporting

confidence: 51%

Geophysical structure of the Southern Alps Orogen, South Island, New Zealand

Davey

Eberhart‐Phillips

Kohler

et al. 2007

A Continental Plate Boundary: Tectonics at South Island, New Zealand

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The central part of the South Island of New Zealand is a product of the transpressive continental collision of the Pacific and Australian plates during the past 5 million years, prior to which the plate boundary was largely transcurrent for over 10 My.Subduction occurs at the north (west dipping) and south (east dipping) of South Island. The deformation is largely accommodated by the ramping up of the Pacific plate over the Australian plate and near-symmetric mantle shortening. The initial asymmetric crustal deformation may be the result of an initial difference in lithospheric strength or an inherited suture resulting from earlier plate motions.Delamination of the Pacific plate occurs resulting in the uplift and exposure of midcrustal rocks at the plate boundary fault (Alpine fault) to form a foreland mountain chain. In addition, an asymmetric crustal root (additional 8 -17 km) is formed, with an underlying mantle downwarp. The crustal root, which thickens southwards, comprises the delaminated lower crust and a thickened overlying middle crust. Lower crust is variable in thickness along the orogen, which may arise from convergence in and lower lithosphere extrusion along the orogen. Low velocity zones in the crust We first review the range of geophysical data available for the South Island.These data are then used to define the main features of the three-dimensional structure of the orogen and provide the context for the detailed structure and development of the plate boundary zone as defined by the Alpine Fault. The chapter closely complements the previous chapter on the geological data base for the South Island, and uses those and other data to constrain its inferences. The conclusions of the In the south, the mountains are also lower, reaching maximum elevations of about 2500 m, and broader, covering most of the southern South Island (Figure 3c). The morphology of the region is less two-dimensional and reflects the grain of the geology that swings around from a NNE to a ESE trend. The Alpine Fault is a more subdued morphological feature, but it is still remarkably linear until it runs offshore at MilfordSound.

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Section: Structure Of the Orogensupporting

confidence: 51%

Geophysical structure of the Southern Alps Orogen, South Island, New Zealand

Davey

Eberhart‐Phillips

Kohler

et al. 2007

A Continental Plate Boundary: Tectonics at South Island, New Zealand

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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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“…IE, to the Alpine Fault's ultimate location west of the Fiordland block. The Alpine Fault is drawn as a small circle about the pole (e.g., Christoffel & van der Linden 1972;Kamp 1986a).…”

Section: Ma (Early Otaian)mentioning

confidence: 99%

“…1H). The Hauroko (Fiordland Boundary) Fault and a strike-slip fault zone offshore to the south (see Collot et al 1995;Lamarche et al 1997) are together represented by a small circle drawn about the pole (e.g., Christoffel & van der Linden 1972). The model implies that considerable lateral motion was being accommodated on the Hauroko Fault, although the geologic evidence for this is uncertain.…”

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confidence: 99%