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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

igh-Resolution Late Devonian Magnetostratigraphy From the Canning Basin, Western Australia: A Re-Evaluatio

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Author(s):
Green, Theodore [1] ; Slotznick, Sarah P. [1] ; Jaqueto, Plinio [2] ; Raub, Timothy D. [3] ; Tohver, Eric [2] ; Playton, Ted E. [4] ; Haines, Peter W. [5] ; Kirschvink, Joseph L. [6, 7] ; Hocking, Roger M. [5] ; Montgomery, Paul [4]
Total Authors: 10
Affiliation:
[1] Dartmouth Coll, Dept Earth Sci, Hanover, NH 03755 - USA
[2] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Sao Paulo - Brazil
[3] Univ St Andrews, Sch Earth & Environm Sci, St Andrews, Fife - Scotland
[4] Chevron, Frontier Explorat & Appraisal, Houston, TX - USA
[5] Geol Survey Western Australia, East Perth, WA - Australia
[6] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 - USA
[7] Tokyo Inst Technol, Earth Life Sci Inst, Tokyo - Japan
Total Affiliations: 7
Document type: Journal article
Source: Frontiers in Earth Science; v. 9, NOV 24 2021.
Web of Science Citations: 0
Abstract

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. (AU)

FAPESP's process: 16/24870-2 - Environmental significance of speleothem magnetism
Grantee:Plinio Francisco Jaqueto
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 19/06709-8 - Speleothem magnetism from the Last Glacial Maximum to the Holocene in South America
Grantee:Plinio Francisco Jaqueto
Support Opportunities: Scholarships abroad - Research Internship - Doctorate