Three-dimensional mantle lithosphere deformation at collisional plate boundaries: A subduction scissor across the South Island of New Zealand
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| Дата: | 2010 |
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Інститут геофізики ім. С.I. Субботіна НАН України
2010
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| Назва видання: | Геофизический журнал |
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| Цитувати: | Three-dimensional mantle lithosphere deformation at collisional plate boundaries: A subduction scissor across the South Island of New Zealand / R. Pysklywec, S. Ellis, A. Gorman // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 136-137. — Бібліогр.: 3 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
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irk-123456789-1030932016-06-14T03:04:13Z Three-dimensional mantle lithosphere deformation at collisional plate boundaries: A subduction scissor across the South Island of New Zealand Pysklywec, R. Ellis, S. Gorman, A. 2010 Article Three-dimensional mantle lithosphere deformation at collisional plate boundaries: A subduction scissor across the South Island of New Zealand / R. Pysklywec, S. Ellis, A. Gorman // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 136-137. — Бібліогр.: 3 назв. — англ. 0203-3100 http://dspace.nbuv.gov.ua/handle/123456789/103093 en Геофизический журнал Інститут геофізики ім. С.I. Субботіна НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| format |
Article |
| author |
Pysklywec, R. Ellis, S. Gorman, A. |
| spellingShingle |
Pysklywec, R. Ellis, S. Gorman, A. Three-dimensional mantle lithosphere deformation at collisional plate boundaries: A subduction scissor across the South Island of New Zealand Геофизический журнал |
| author_facet |
Pysklywec, R. Ellis, S. Gorman, A. |
| author_sort |
Pysklywec, R. |
| title |
Three-dimensional mantle lithosphere deformation at collisional plate boundaries: A subduction scissor across the South Island of New Zealand |
| title_short |
Three-dimensional mantle lithosphere deformation at collisional plate boundaries: A subduction scissor across the South Island of New Zealand |
| title_full |
Three-dimensional mantle lithosphere deformation at collisional plate boundaries: A subduction scissor across the South Island of New Zealand |
| title_fullStr |
Three-dimensional mantle lithosphere deformation at collisional plate boundaries: A subduction scissor across the South Island of New Zealand |
| title_full_unstemmed |
Three-dimensional mantle lithosphere deformation at collisional plate boundaries: A subduction scissor across the South Island of New Zealand |
| title_sort |
three-dimensional mantle lithosphere deformation at collisional plate boundaries: a subduction scissor across the south island of new zealand |
| publisher |
Інститут геофізики ім. С.I. Субботіна НАН України |
| publishDate |
2010 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/103093 |
| citation_txt |
Three-dimensional mantle lithosphere deformation at collisional plate boundaries: A subduction scissor across the South Island of New Zealand / R. Pysklywec, S. Ellis, A. Gorman // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 136-137. — Бібліогр.: 3 назв. — англ. |
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Геофизический журнал |
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2025-07-07T13:16:52Z |
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| fulltext |
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Three-dimensional mantle lithosphere deformation
at collisional plate boundaries: A subduction scissor across
the South Island of New Zealand
R. Pysklywec1, S. Ellis2, A. Gorman3, 2010
1Department of Geology, University of Toronto, Toronto, Ontario Canada
russ@geology.utoronto.ca
2Institute of Geological and Nuclear Sciences, Lower Hutt, New Zealand
S.Ellis@gns.cri.nz
3Department of Geology, University of Otago, Dunedin, New Zealand
andrew.gorman@otago.ac.nz
The continental plate collision across the South
Island of New Zealand is highly oblique (dextral) and
is bounded by oppositely verging ocean plate sub-
duction zones — with north-west dipping Hikurangi
subduction to the north and east-dipping Fiordland-
Puysegur subduction to the south [e. g.; Okaya et
al., 2007; and references therein]. As such, the re-
gion can be considered as a type of "subduction
scissor". Within this tectonic context, we use three
dimensional computational geodynamic models to
consider how convergent mantle lithosphere can be
modified by scissor and strike-slip effects. Boun-
ding subduction at both ends of the continental col-
lision causes flow of the descending mantle litho-
sphere in the direction along-strike of the model plate
boundary, with thinning in the centre and thickening
towards the subduction zones that bifurcates the
continental mantle lithosphere root. With dipping
bounding subduction, the mantle lithosphere root
takes on a more complex morphology that folds over
from one subduction polarity to the other, but re-
mains as a continuous feature as it folds under the
collision zone (Figure). In the absence of bounding
subduction, the plate convergence causes a linear
(along-strike) mantle lithosphere root to develop. A
rapid strike-slip motion between the converging
plates transfers material in the plate boundary-pa-
rallel direction and tends to blur out features that
develop in this direction — such as descending vis-
cous instabilities. The along-strike variations in the
morphology of the mantle lithosphere root that de-
velop in the models — viz., thickening of the root
towards the subduction edges, thinning in the cen-
ter — are consistent with recent, albeit poorly con-
strained, geophysical interpretations of the larges-
cale lithospheric structure of the South Island
[Kohler, Eberhart-Phillips, 2002; Scherwath et al.,
2006]. We speculate that this reflects the nature of
the evolution of the South Island collision as a limi-
ted continental segment of the plate boundary that
it is dominated and guided by adjacent well-devel-
oped/developing ocean plate subduction. The mod-
elling provides insights into how varying "three-di-
mensional effects" could influence the evolution of
the continental mantle lithosphere at the South Is-
land and may have implications for understanding
other collisional zones where a continental plate
ends or transitions into ocean plate subduction.
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References
Kohler M., Eberhart-Phillips D. Three-dimensional
lithospheric structure below the New Zealand
Southern Alps // Geophys. J. Res. — 2002. — 107.
Okaya D., Stern T., Davey F., Henrys S., Cox S. Conti-
nent-continent collision at the Pacic/Indo-Austra-
lian plate boundary: back- ground, motivation, and
principal results / Eds. D. A. Okaya, T. A. Stern,
F. J. Davey. A continental plate boundary: tectonics
at South Island, New Zealand // Amer. Geophys.
Union. — 2007. — 175. — P. 1—18.
Scherwath M., Stern T., Davey F., Davies R. Three-di-
mensional lithospheric deformation and gravity
anomalies associated with oblique continental
collision in South Island, New Zealand // Geophys.
J. Int. — 2006. — 167.
Model CS3 at 29 Myr. Three views of the inverted anvil-type morphology of the mantle lithosphere (marked distances in km).
Inset table indicates velocity boundary conditions on the six surfaces of the box. The locations of the faces are indicated by
intercepts of the planes as well as their corresponding compass direction in the convention adopted here. The velocity
magnitudes are in cm/yr and indicate the total magnitude for the spatially variable boundary conditions on the individual faces;
'p' refers to a periodic boundary condition, 'fs' refers to free slip.
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