Three-dimensional lateral crustal thickening in continental oblique collision: an example from the Southern Alps, New Zealand

Details Three-dimensional lateral crustal thickening in continental oblique collision: an example from the Southern Alps, New Zealand Three-dimensional lateral crustal thickening in continental oblique collision: an example from the Southern Alps, New Zealand

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002geoji.150..770g&link_type=abstract

Geophysical Journal International, Volume 150, Issue 3, pp. 770-779.

Astronomy and Astrophysics

Astronomy

12

Continental Collision, Crustal Thickening, Lithospheric Buckling, Lower Crustal Flow, Mechanical Modelling, Oblique Convergence

Scientific paper

Crustal thickening in an oblique continental collision, such as in the South Island of New Zealand, necessarily involves deformation processes in three dimensions (3-D). We have investigated the role played by the strength of the lower crust using simplified 3-D mechanical models. These models show that crustal thickening occurs away from the area of maximum compression, along an axis inclined to the plate boundary (about 10°-20° to the plate boundary in the case of the South Island), and perpendicular to the convergence direction. Furthermore, the specific geometry of the relatively old and strong Australian lithosphere versus the Pacific lithosphere also controls the location of crustal thickening. These conditions could explain the observed mismatch between the locations of maximum elevation and minimum gravity in South Island, New Zealand, as a consequence of decoupled deformation owing to low-viscosity lower crust.

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