Fitting Northland, New Caledonia and dlEntrecasteaux geology into the Late Cretaceous-Cenozoic Southwest Pacific tectonic framework

W. P. Schellart; J. Freeman; D. R. Stegman

doi:10.1071/ASEG2006ab158

ISSN: 2202-0586
E-ISSN:

oa Fitting Northland, New Caledonia and dlEntrecasteaux geology into the Late Cretaceous-Cenozoic Southwest Pacific tectonic framework
Authors W. P. Schellart^a, J. Freeman^b and D. R. Stegman^c
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^a Research School of Earth SciencesThe Australian National University, Canberra, Act 0200 VIC 3800, Australia, [email protected], [email protected] ^b Research School of Earth SciencesThe Australian National University, Canberra, Act 0200 Australia, [email protected] ^c School of Mathematics Monash University, Melbourne, , Australia
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2006, Issue ASEG2006 - 18th Geophysical Conference, Dec 2006, p. 1 - 3
DOI: https://doi.org/10.1071/ASEG2006ab158
- Published online: 01 Dec 2006

Abstract

Since the advent of plate tectonics different reference frames have been proposed to describe the “absolute” motion of plates. The most prominent ones include the hot spot reference frame and the no-net-rotation reference frame. The difference in absolute plate motion between different reference frames can be substantial (up to 4 cm/yr). These differences are truly significant, considering that the velocity of the fast plates is only 6-12 cm/yr in such reference frames. It is thus of primary importance to extract which of these reference frames is most likely to describe the absolute motion of plates. Here we propose that the best candidate representing an absolute reference frame is the one, which minimizes the cumulative amount of trench migration for all subduction zones. From the absolute reference frames proposed thus far, it is found that the cumulative amount of trench migration is lowest in the Indo-Atlantic hot spot reference frame. This implies that the Indo-Atlantic hot spot reference frame is currently the best approximation of an absolute reference frame on Earth.

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Article Type: Research Article

Keyword(s): absolute reference frame; plate motion; slab rollback; subduction zone; trench migration

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oa Fitting Northland, New Caledonia and dlEntrecasteaux geology into the Late Cretaceous-Cenozoic Southwest Pacific tectonic framework

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