Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published November 24, 2021 | Published + Supplemental Material
Journal Article Open

High-Resolution Late Devonian Magnetostratigraphy From the Canning Basin, Western Australia: A Re-Evaluation


Late Devonian time was a period of rapid upheaval in the Earth system, including climate change, sea level changes, widespread ocean anoxia, and the Frasnian-Famennian mass extinction; the cause(s) of these changes remain(s) uncertain. The Lennard Shelf of the Canning Basin in Western Australia contains carbonate reef sections spanning much of the Late Devonian Epoch and has been sampled for paleomagnetic analysis with studies by Hansma and colleagues in 2015 and Playton and colleagues in 2016. However, previous paleomagnetic directions were scattered and their use for magnetostratigraphy has been questioned. Here, rock magnetic data and magnetostratigraphy for a late Devonian drill-core from the Lennard Shelf were analyzed. Three magnetostratigraphic interpretations were made using different paleopoles that showed good correlation with each other and the earlier interpretations by Playton and colleagues in 2016. Additionally, the rock magnetic data revealed the samples contain various mixtures of detrital and diagenetic minerals, the former of which should be viable recorders of primary magnetic signatures. Even in samples with these detrital phases, paleomagnetic data were often noisy and produced ambiguous polarity assignments, likely due to the anomalously weak Devonian field. Because of this ambiguity and the absence of a robust paleopole, broader correlations for this critical time-period will be difficult without additional paleomagnetic data from the late Devonian Period. Expanded data for this interval could eventually shed light on the timing, causes, and rates of the Frasnian-Famennian mass extinction and other environmental shifts in the late Devonian Epoch.

Additional Information

© 2021 Green, Slotznick, Jaqueto, Raub, Tohver, Playton, Haines, Kirschvink, Hocking and Montgomery. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. Received: 12 August 2021; Accepted: 27 September 2021; Published: 24 November 2021. We especially thank the Aboriginal tribes of the Gooniyandi (Kuniandi) people, who allowed us to conduct this research on their sacred lands. We would like to acknowledge Matthew Diamond and Steven Skinner for aid in sample preparation; Isaac Hilburn for lab discussions and data archiving; and Kelly Hillbun for co-leading field observations and sample collection. Field support and safety assistance were provided by Wundargoodie Aboriginal Safaris (Colin and Maria Morgan and family and crew), the Geological Survey of Western Australia, and the Chevron Australian Business Unit. Thanks to the Mimbi Community and Mount Pierre Station for field area access and resources. Thanks to R. Addenbrooke, A. Duffy, G. Beacher, T. Holland, S. Shoepfer, U. Singh, M. Thorp, and P. Ward for field assistance. PH and RH publish with the permission of the Executive Director of the Geological Survey of Western Australia. Data Availability Statement. The datasets presented in this study can be found in online repositories. The names of the repository/repositories and accession number(s) can be found below: https://earthref.org/MagIC/19274/e5ab18fe-735d-4025-97b8-78d48a951fa8, https://earthref.org/MagIC/19273/ac274eec-b4f3-4e22-91a3-131f8839d547, https://earthref.org/MagIC/19349, https://earthref.org/MagIC/19348. Author Contributions. PM, TP, ET, RH, PH, and JK initiated and executed the Canning Basin Chronostratigraphy Project and field campaign. JK brought forward Winkie drill methodology to the project. TR and JK formulated the sampling technique and project goals. SS and PJ performed laboratory analyses. TG and SS analyzed the data. TG and SS drafted figures and wrote the manuscript with contributions from TP, PJ, and RH. Funding was supplied by the Australian Research Council Linkage Program (grant LP0883812), ARC-QEII Grant Program, ARC-DORA-3 Grant Program, MERIWA, WAERA, CSIRO, Buru, Chevron Australian Business Unit, Chevron Energy Technology Company, the University of Greenwich, and Chemostrat, Ltd. PJ is supported by CAPES and FAPESP grant #2016/24870-2 and #2019/06709-8. While collecting laboratory analyses, SPS was supported by a NSF Graduate Research Fellowship. TG was supported by a Dartmouth College Senior Fellowship. Conflict of Interest. Authors PM and TP were employed by the company the Chevron Energy Technology Company. Funding for the fieldwork and laboratory analyses was provided by the Chevron Australian Business Unit, Chevron Energy Technology Company and Chemostrat, LTD. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Attached Files

Published - feart-09-757749.pdf

Supplemental Material - DataSheet1_High-Resolution_Late_Devonian_Magnetostratigraphy_From_the_Canning_Basin,_Western_Australia__A_Re-Evaluation.pdf



Additional details

September 15, 2023
October 23, 2023