CaltechAUTHORS
  A Caltech Library Service

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 (2020) Stratigraphic architecture of Solander Basin records Southern Ocean currents and subduction initiation beneath southwest New Zealand. Basin Research . ISSN 0950-091X. (In Press) https://resolver.caltech.edu/CaltechAUTHORS:20200519-132017615

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20200519-132017615

Abstract

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
https://doi.org/10.1111/bre.12473DOIArticle
ORCID:
AuthorORCID
Patel, Jiten0000-0001-6952-4708
Sutherland, Rupert0000-0001-7430-0055
Gurnis, Michael0000-0003-1704-597X
Shuck, Brandon0000-0003-2543-721X
Stock, Joann0000-0003-4816-7865
Additional Information:© 2018 Wiley. Accepted manuscript online: 18 May 2020.
Group:Seismological Laboratory
Subject Keywords:Antarctic Circumpolar Current; Fiordland; Puysegur; Subduction‐related basins; Subtropical Front; tectonics and sedimentation
Record Number:CaltechAUTHORS:20200519-132017615
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200519-132017615
Official Citation:Patel, J., Sutherland, R., Gurnis, M., Van Avendonk, H., Gulick, S.P., Shuck, B., Stock, J. and Hightower, E. (2020), Stratigraphic architecture of Solander Basin records Southern Ocean currents and subduction initiation beneath southwest New Zealand. Basin Res. Accepted Author Manuscript. doi:10.1111/bre.12473
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103318
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 May 2020 20:25
Last Modified:19 May 2020 20:25

Repository Staff Only: item control page