Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/57042
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Type: | Journal article |
Title: | Magnetotelluric constraints on subduction polarity: Reversing reconstruction models for Proterozoic Australia |
Author: | Selway, K. Hand, M. Heinson, G. Payne, J. |
Citation: | Geology (Boulder), 2009; 37(9):799-802 |
Publisher: | Geological Soc America Inc |
Issue Date: | 2009 |
ISSN: | 0091-7613 0091-7613 |
Statement of Responsibility: | Kate Selway, Martin Hand, Graham S. Heinson and Justin L. Payne |
Abstract: | Two-dimensional, lithospheric-scale magnetotelluric imaging in the central Australian Proterozoic has constrained the large-scale architecture of terrane assembly during Paleoproterozoic accretion and collision. The comparatively conductive North Australian craton, consisting of rocks between ~2500 and 1730 Ma in age, has been imaged to extend for 150 km under the 1690–1620 Ma Warumpi Province, which forms part of a large, comparatively juvenile terrane in central-southern Australia. Collision between the North Australia craton and Warumpi Province occurred ca. 1640 Ma. The boundary between these domains is modeled to be subvertical at crustal scale, but dips south at ~45° in the mantle to depths of 150 km. We interpret this geometry to reflect lithospheric-scale underthrusting of the North Australian craton beneath the Warumpi Province, and suggest that it provides a first-order constraint on subduction polarity during collision ca. 1640 Ma. In contrast, most contemporary models for the evolution of Paleoproterozoic Australia propose that the North Australian craton was located on the overriding plate of a long-lived (ca. 1800–1550 Ma) north-directed subduction system. The polarity of these models is not consistent with the lithospheric-scale geophysical architecture. |
DOI: | 10.1130/G30175A.1 |
Grant ID: | http://purl.org/au-research/grants/arc/LP0560887 http://purl.org/au-research/grants/arc/LP0560887 |
Published version: | http://dx.doi.org/10.1130/g30175a.1 |
Appears in Collections: | Aurora harvest 5 Earth and Environmental Sciences publications Environment Institute publications |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.