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Delayed Subsidence After Rifting and a Record of Breakup for Northwestern Zealandia
Author(s) -
Boston Brian,
Nakamura Yasuyuki,
Gallais Flora,
Hackney Ron,
Fujie Gou,
Kodaira Shuichi,
Miura Seiichi,
Kaiho Yuka,
Saito Saneatsu,
Shiraishi Kazuya,
Yamada Yasuhiro
Publication year - 2019
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.983
H-Index - 232
eISSN - 2169-9356
pISSN - 2169-9313
DOI - 10.1029/2018jb016799
Subject(s) - geology , paleontology , rift , gondwana , thermal subsidence , breakup , lithosphere , structural basin , unconformity , passive margin , tectonics , psychology , psychoanalysis
Abstract Continental rifting and breakup of eastern Gondwana during the Cretaceous separated northern Zealandia from eastern Australia, but the processes leading to this highly extended and largely submerged block of continental crust are unknown. We acquired and processed multichannel seismic reflection data across northern Zealandia and examine the stratigraphy of the Middleton Basin. We identified a two‐phase formation process for the basin, as evidenced by an unconformity separating two postrift units. After initial basin formation and slow deposition of the lower postrift unit, deposition rates within the Middleton Basin rapidly increased in response to the latest stage of subsidence and to create the modern basin. We propose a tectonic model wherein the Middleton Basin initiated through oceanic spreading and the subsequent postrift subsidence of the newly created oceanic lithosphere was delayed due to thermal buoyancy associated with nearby oceanic spreading in the Tasman Basin. Our results provide new constraints on rifting and breakup processes of wide, magma‐poor, and asymmetric margins and indicate that multiple regions of weak lithosphere may have influenced the breakup.