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Widespread compression associated with Eocene Tonga-Kermadec subduction initiation

Sutherland, R. and Collot, J. and Bache, F. and Henrys, S. and Barker, D. and Browne, G. H. and Lawrence, M. J. F. and Morgans, H. E. G. and Hollis, C. J. and Clowes, C. and Mortimer, N. and Rouillard, P. and Gurnis, M. and Etienne, S. and Stratford, W. (2017) Widespread compression associated with Eocene Tonga-Kermadec subduction initiation. Geology, 45 (4). pp. 355-358. ISSN 0091-7613. doi:10.1130/G38617.1.

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Eocene onset of subduction in the western Pacific was accompanied by a global reorganization of tectonic plates and a change in Pacific plate motion relative to hotspots during the period 52–43 Ma. We present seismic-reflection and rock sample data from the Tasman Sea that demonstrate that there was a period of widespread Eocene continental and oceanic compressional plate failure after 53–48 Ma that lasted until at least 37–34 Ma. We call this the Tectonic Event of the Cenozoic in the Tasman Area (TECTA). Its compressional nature is different from coeval tensile stresses and back-arc opening after 50 Ma in the Izu-Bonin-Mariana region. Our observations imply that spatial and temporal patterns of stress evolution during western Pacific Eocene subduction initiation were more varied than previously recognized. The evolving Eocene geometry of plates and boundaries played an important role in determining regional differences in stress state.

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Gurnis, M.0000-0003-1704-597X
Additional Information:© 2017 Geological Society of America. Received 19 September 2016. Revision received 16 November 2016. Accepted 18 November 2016. We thank: the crew of R/V Tangaroa voyages TAN1312 and TAN1409; students and National Institute of Water and Atmospheric Research (New Zealand) technicians that were on those voyages; and technical staff at GNS Science that assisted with sample processing. This work was funded by the governments of New Zealand and New Caledonia, and all data are available from GNS Science, New Zealand Petroleum and Minerals, Geoscience Australia, or the Geological Survey of New Caledonia. We thank three reviewers and editor Robert Holdwsorth for their comments on the paper.
Group:Seismological Laboratory
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Government of New ZealandUNSPECIFIED
Government of New CaledoniaUNSPECIFIED
Issue or Number:4
Record Number:CaltechAUTHORS:20170207-074721774
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Official Citation:Widespread compression associated with Eocene Tonga-Kermadec subduction initiation R. Sutherland, J. Collot, F. Bache, S. Henrys, D. Barker, G.H. Browne, M.J.F. Lawrence, H.E.G. Morgans, C.J. Hollis, C. Clowes, N. Mortimer, P. Rouillard, M. Gurnis, S. Etienne, W. Stratford Geology Apr 2017, 45 (4) 355-358; DOI: 10.1130/G38617.1
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74125
Deposited By: Tony Diaz
Deposited On:09 Feb 2017 20:28
Last Modified:11 Nov 2021 05:24

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