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Stratigraphic architecture of Solander Basin records Southern Ocean currents and subduction initiation beneath southwest New Zealand

Patel, Jiten and Sutherland, Rupert and Gurnis, Michael and Van Avendonk, Harm and Gulick, Sean P. S. and Shuck, Brandon and Stock, Joann and Hightower, Erin (2021) Stratigraphic architecture of Solander Basin records Southern Ocean currents and subduction initiation beneath southwest New Zealand. Basin Research, 33 (1). pp. 403-426. ISSN 0950-091X. doi:10.1111/bre.12473.

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Solander Basin is currently characterised by subduction initiation at the Pacific‐Australia plate boundary, where high biological productivity is found at the northern edge of the Antarctic Circumpolar Current. Sedimentary architecture results from tectonic influences on accommodation space, sediment supply, and ocean currents (via physiography); and climate influence on ocean currents and biological productivity. We present the first seismic‐stratigraphic analysis of Solander Basin based on high‐fold seismic‐reflection data (voyage MGL1803, SISIE). Solander Trough physiography formed by Eocene rifting, but basinal strata are mostly younger than ~17 Ma, when we infer Puysegur Ridge formed and sheltered Solander Basin from bottom currents, and mountain growth onshore increased sediment supply. Initial inversion on the Tauru Fault started at ~15 Ma, but reverse faulting from 12 to ~8 Ma on both the Tauru and Parara Faults was likely associated with reorganization and formation of the subduction thrust. The new seabed topography forced sediment pathways to become channelized at low points or antecedent gorges. Since 5 Ma, southern Puysegur Ridge and Fiordland mountains spread out towards the east and Solander Anticline grew in response to ongoing subduction and growth of a slab. Solander Basin had high sedimentation rates because: (1) it is sheltered from bottom currents by Puysegur Ridge; and (2) it has a mountainous land area that supplies sediment to its northern end. Sedimentary architecture is asymmetric due to the Subtropical Front, which moves pelagic and hemi‐pelagic sediment, including dilute parts of gravity flows, eastward and accretes contourites to the shelf south of Stewart Island. Levees, scours, drifts, and ridges of folded sediment characterize western Solander Basin, whereas hemi‐pelagic drape and secondary gravity flows are found east of the meandering axial Solander Channel. The high‐resolution record of climate and tectonics that Solander Basin contains may yield excellent sites for future scientific ocean drilling.

Item Type:Article
Related URLs:
URLURL TypeDescription
Patel, Jiten0000-0001-6952-4708
Sutherland, Rupert0000-0001-7430-0055
Gurnis, Michael0000-0003-1704-597X
Van Avendonk, Harm0000-0002-8016-2653
Gulick, Sean P. S.0000-0003-4740-9068
Shuck, Brandon0000-0003-2543-721X
Stock, Joann0000-0003-4816-7865
Hightower, Erin0000-0002-4734-5159
Additional Information:© 2020 The Authors. Basin Research © 2020 John Wiley & Sons Ltd, European Association of Geoscientists & Engineers and International Association of Sedimentologists. Issue Online: 22 January 2021; Version of Record online: 03 June 2020; Accepted manuscript online: 18 May 2020; Manuscript accepted: 29 April 2020; Manuscript revised: 22 April 2020; Manuscript received: 28 January 2020. Research funding: National Science Foundation, USA. Grant Numbers: NSF‐OCE‐1654689, NSF‐OCE‐1654766.
Group:Seismological Laboratory
Funding AgencyGrant Number
Subject Keywords:Antarctic Circumpolar Current; Fiordland; Puysegur; Subduction‐related basins; Subtropical Front; tectonics and sedimentation
Issue or Number:1
Record Number:CaltechAUTHORS:20200519-132017615
Persistent URL:
Official Citation:Patel, J, Sutherland, R, Gurnis, M, et al. Stratigraphic architecture of Solander Basin records Southern Ocean currents and subduction initiation beneath southwest New Zealand. Basin Res. 2021; 33: 403–426.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103318
Deposited By: Tony Diaz
Deposited On:19 May 2020 20:25
Last Modified:16 Nov 2021 18:20

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