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Scientific drilling of sediments at Darwin Crater, Tasmania

Lisé-Pronovost, Agathe; Fletcher, Michael S.; Mallett, Tom; Mariani, Michela; Lewis, Richard; Gadd, Patricia S.; Herries, Andy I.R.; Blaauw, Maarten; Heijnis, Hendrik; Hodgson, Dominic A.; Pedro, Joel B.

Authors

Agathe Lisé-Pronovost

Michael S. Fletcher

Tom Mallett

Richard Lewis

Patricia S. Gadd

Andy I.R. Herries

Maarten Blaauw

Hendrik Heijnis

Dominic A. Hodgson

Joel B. Pedro



Abstract

A 70 m long continental sediment record was recovered at Darwin Crater in western Tasmania, Australia. The sediment succession includes a pre-lake silty sand deposit overlain by lacustrine silts that have accumulated in the ∼816 ka meteorite impact crater. A total of 160 m of overlapping sediment cores were drilled from three closely spaced holes. Here we report on the drilling operations at Darwin Crater and present the first results from petrophysical whole core logging, lithological core description, and multi-proxy pilot analysis of core end samples. The multi-proxy dataset includes spectrophotometry, grain size, natural gamma rays, paleo- and rock magnetism, loss on ignition, and pollen analyses. The results provide clear signatures of alternating, distinctly different lithologies likely representing glacial and interglacial sediment facies. Initial paleomagnetic analysis indicate normal magnetic polarity in the deepest core at Hole B. If acquired at the time of deposition, this result indicates that the sediment 1 m below commencement of lacustrine deposition post-date the Matuyama–Brunhes geomagnetic reversal ∼773 ka.

Journal Article Type Article
Publication Date Jun 12, 2019
Journal Scientific Drilling
Print ISSN 1816-8957
Electronic ISSN 1816-3459
Publisher Copernicus Publications
Peer Reviewed Peer Reviewed
Volume 25
Pages 1-14
APA6 Citation Lisé-Pronovost, A., Fletcher, M. S., Mallett, T., Mariani, M., Lewis, R., Gadd, P. S., …Pedro, J. B. (2019). Scientific drilling of sediments at Darwin Crater, Tasmania. Scientific Drilling, 25, 1-14. https://doi.org/10.5194/sd-25-1-2019
DOI https://doi.org/10.5194/sd-25-1-2019
Publisher URL https://www.sci-dril.net/25/1/2019/

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