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The tectonic history of the Tasman Sea: A puzzle with 13 pieces

Gaina, Carmen and Müller, R. Dietmar and Royer, Jean-Yves and Stock, Joann and Hardebeck, Jeanne and Symonds, Phil (1998) The tectonic history of the Tasman Sea: A puzzle with 13 pieces. Journal of Geophysical Research B, 103 (B6). pp. 12413-12433. ISSN 0148-0227. doi:10.1029/98JB00386.

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We present a new model for the tectonic evolution of the Tasman Sea based on dense satellite altimetry data and a new shipboard data set. We utilized a combined set of revised magnetic anomaly and fracture zone interpretations to calculate relative motions and their uncertainties between the Australian and the Lord Howe Rise plates from 73.6 Ma to 52 Ma when spreading ceased. From chron 31 (67.7 Ma) to chron 29 (64.0 Ma) the model implies, transpression between the Chesterfield and the Marion plateaus, followed by strike-slip motion. This transpression may have been responsible for the formation of the Capricorn Basin south of the Marion Plateau. Another major tectonic event took place at chron 27 (61.2 Ma), when a counterclockwise change in spreading direction occurred, contemporaneous with a similar event in the southwest Pacific Ocean. The early opening of the Tasman Sea cannot be modeled by a simple two-plate system because (1) rifting in this basin propagated from south to north in several stages and (2) several rifts failed. We identified 13 continental blocks which acted as microplates between 90 Ma and 64 Ma. Our model is constrained by tectonic lineaments visible in the gravity anomaly grid and interpreted as strike-slip faults, by magnetic anomaly, bathymetry and seismic data, and in case of the South Tasman Rise, by the age and affinity of dredged rocks. By combining all this information we derived finite rotations that describe the dispersal of these tectonic elements during the early opening of the Tasman Sea.

Item Type:Article
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Müller, R. Dietmar0000-0002-3334-5764
Stock, Joann0000-0003-4816-7865
Additional Information:© 1998 by the American Geophysical Union. Received August 20, 1997; revised December 23, 1997; accepted January 27, 1998. Paper number 98JB00386. The results presented here are part of a Ph.D. project sponsored by the Australian Geological Survey Organisation. The first author acknowledges support from the Department of Geology and Geophysics, University of Sydney. We thank the Royal Australian Navy for making digital magnetic anomaly data collected by the HMAS Cook available to us. We benefited from some insightful discussions with and unbiased views (at the 95% confidence level) from Ted Chang and Richard Gordon while they were visiting Sydney University. For digitizing magnetic anomaly identifications we used a program developed by Anahita Tikku from the Scripps Institution of Oceanography. Most of the figures were drafted using the GMT software [Wessel and Smith, 1991]. This work was partially supported by National Science Foundation grant OCE-9416779 to J. Stock. JYR acknowledges support from the Centre National de la Recherche Scientifique and from the French Ministry of Education during his stay in Sydney. Marine gravity data south of 72ºS supplied by Seymour Laxon, University College London, and Dave McAdoo, NOAA. Géosciences Azur contribution 174.
Group:Seismological Laboratory, Division of Geological and Planetary Sciences
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Australian Geological Survey OrganisationUNSPECIFIED
University of SydneyUNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Ministère de l'Éducation nationaleUNSPECIFIED
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Géosciences Azur174
Issue or Number:B6
Record Number:CaltechAUTHORS:20140923-145247866
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Official Citation:Gaina, C., D. R. Müller, J.-Y. Royer, J. Stock, J. Hardebeck, and P. Symonds (1998), The tectonic history of the Tasman Sea: A puzzle with 13 pieces, J. Geophys. Res., 103(B6), 12413–12433, doi:10.1029/98JB00386.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49959
Deposited By: Ruth Sustaita
Deposited On:23 Sep 2014 22:20
Last Modified:10 Nov 2021 18:50

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