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Continental-scale geographic change across Zealandia during Paleogene subduction initiation

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 and X. Zhou
Continental-scale geographic change across Zealandia during Paleogene subduction initiation
Geology (Boulder) (February 2020) 48 (5): 419-424


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 ( approximately 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 approximately 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.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 48
Serial Issue: 5
Title: Continental-scale geographic change across Zealandia during Paleogene subduction initiation
Affiliation: Victoria University of Wellington, SGEES, Wellington, New Zealand
Pages: 419-424
Published: 20200206
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 37
Accession Number: 2020-028687
Categories: Solid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2020110
Illustration Description: illus. incl. geol. sketch map
S32°00'45" - S32°00'45", E165°27'09" - E165°27'09"
S26°29'19" - S26°29'19", E166°31'43" - E166°31'43"
Secondary Affiliation: Rice University, USA, United StatesInternational Ocean Discovery Program, USA, United StatesUniversita di Padova, ITA, ItalyUniversidad de Zaragoza, ESP, SpainLeibniz-Institut fuer Evolutions und Biodiversitaetsforschung, Museum fuer Naturkunde, DEU, GermanyGeological Survey of New Caledonia, NCL, New CaledoniaPeking University, CHN, ChinaUtrecht University, NLD, NetherlandsUniversitaet Bremen, DEU, GermanyUniversity of California-Santa Cruz, USA, United StatesUniversidade de Brasilia, BRA, BrazilCalifornia Institute of Technology, USA, United StatesUniversity of Tokyo, JPN, JapanUniversity of California-Riverside, USA, United StatesUniversity of Massachusetts-Amherst, USA, United StatesChinese Academy of Sciences, Institute of Oceanology, CHN, ChinaTohoku University, JPN, JapanGNS Science, NZL, New ZealandUniversity College London, GBR, United KingdomPusan National University, KOR, South KoreaCUNY, Queens College, USA, United StatesYale University, USA, United StatesJapan Agency for Marine-Earth Science and Technology, JPN, JapanRutgers University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 202019
Program Name: DSDPDeep Sea Drilling Project
Program Name: IODPIntegrated Ocean Drilling Program
Program Name: IODP2International Ocean Discovery Program
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