Continental-scale geographic change across zealandia during paleogene subduction initiation

Sutherland, R. ; Dickens, G.R. ; Blum, P. ; Agnini, C. ; Alegret, L. (Universidad de Zaragoza) ; Asatryan, G. ; Bhattacharya, J. ; Bordenave, A. ; Chang, L. ; Collot, J. ; Cramwinckel, M.J. ; Dallanave, E. ; Drake, M.K. ; Etienne, S.J.G. ; Giorgioni, M. ; Gurnis, M. ; Harper, D.T. ; Huang, H.H.M. ; Keller, A.L. ; Lam, A.R. ; Li, H. ; Matsui, H. ; Morgans, H.E.G. ; Newsam, C. ; Park, Y.H. ; Pascher, K.M. ; Pekar, S.F. ; Penman, D.E. ; Saito, S. ; Stratford, W.R. ; Westerhold, T. ; Zhou, X.

Resumen: 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.

Idioma: Inglés

DOI: 10.1130/G47008.1

Año: 2020

Publicado en: Geology 48, 5 (2020), 419-424
ISSN: 0091-7613

Factor impacto JCR: 5.399 (2020)

Categ. JCR: GEOLOGY rank: 1 / 48 = 0.021 (2020) - Q1 - T1

Factor impacto SCIMAGO: 2.609 - Geology (Q1)

Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/CGL2017-84693-R

Tipo y forma: Article (Published version)

Área (Departamento): Área Paleontología (Dpto. Ciencias de la Tierra)