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Continental-scale geographic change across Zealandia during Paleogene subduction initiation

Sutherland, R. and Gurnis, M. (2020) Continental-scale geographic change across Zealandia during Paleogene subduction initiation. Geology, 48 (5). pp. 419-424. ISSN 0091-7613. doi:10.1130/G47008.1.

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Data from International Ocean Discovery Program (IODP) Expedition 371 reveal vertical movements of 1–3 km in northern Zealandia during early Cenozoic subduction initiation in the western Pacific Ocean. Lord Howe Rise rose from deep (~1 km) water to sea level and subsided back, with peak uplift at 50 Ma in the north and between 41 and 32 Ma in the south. The New Caledonia Trough subsided 2–3 km between 55 and 45 Ma. We suggest these elevation changes resulted from crust delamination and mantle flow that led to slab formation. We propose a “subduction resurrection” model in which (1) a subduction rupture event activated lithospheric-scale faults across a broad region during less than ~5 m.y., and (2) tectonic forces evolved over a further 4–8 m.y. as subducted slabs grew in size and drove plate-motion change. Such a subduction rupture event may have involved nucleation and lateral propagation of slip-weakening rupture along an interconnected set of preexisting weaknesses adjacent to density anomalies.

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Gurnis, M.0000-0003-1704-597X
Additional Information:© 2020 The Authors. Gold Open Access: This paper is published under the terms of the CC-BY license. Manuscript received 15 September 2019; Revised manuscript received 17 December 2019; Manuscript accepted 26 December 2019. We thank the International Ocean Discovery Program (IODP); the personnel of R/V JOIDES Resolution on Expedition 371; proponents unable to sail on Expe¬dition 371; and everyone on surveys TAN1312, TAN1409, and TECTA. This work was funded by the U.S. National Science Foundation; IODP participating countries; New Zealand, France, and New Caledonia (site surveys); the Spanish Ministry of Economy and Competitiveness and Fondo Europeo de Desarrollo Regional (FEDER) funds project CGL2017–84693-R and a Leonardo Grant, BBVA Foundation (Alegret); Korean IODP (K-IODP) (Park); China grant NSFC 41473029, 91958110 (He Li); and Brazil grant 183/2017-CII/CGPE/DPB/CAPES (Giorgioni).
Funding AgencyGrant Number
International Ocean Discovery Program (IODP)UNSPECIFIED
Ministerio de Economía, Industria y Competitividad (MINECO)UNSPECIFIED
Fondo Europeo de Desarrollo Regional (FEDER)CGL2017-84693-R
National Natural Science Foundation of China41473029
National Natural Science Foundation of China91958110
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)183/2017-CII/CGPE/DPB/CAPES
Issue or Number:5
Record Number:CaltechAUTHORS:20200210-142027106
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Official Citation:R. Sutherland, G.R. Dickens, P. Blum, C. Agnini, L. Alegret, G. Asatryan, J. Bhattacharya, A. Bordenave, L. Chang, J. Collot, M.J. Cramwinckel, E. Dallanave, M.K. Drake, S.J.G. Etienne, M. Giorgioni, M. Gurnis, D.T. Harper, H.-H.M. Huang, A.L. Keller, A.R. Lam, H. Li, H. Matsui, H.E.G. Morgans, C. Newsam, Y.-H. Park, K.M. Pascher, S.F. Pekar, D.E. Penman, S. Saito, W.R. Stratford, T. Westerhold, X. Zhou; Continental-scale geographic change across Zealandia during Paleogene subduction initiation. Geology ; 48 (5): 419–424. doi:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101211
Deposited By: Tony Diaz
Deposited On:10 Feb 2020 22:35
Last Modified:16 Nov 2021 18:00

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