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Scientific drilling of sediments at Darwin Crater, Tasmania

Citation

Lise-Pronovost, A and Fletcher, M-S and Mallett, T and Mariani, M and Lewis, R and Gadd, PS and Herries, AIR and Blaauw, M and Heijnis, H and Hodgson, DA and Pedro, JB, Scientific drilling of sediments at Darwin Crater, Tasmania, Scientific Drilling, 25 pp. 1-14. ISSN 1816-8957 (2019) [Refereed Article]


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DOI: doi:10.5194/sd-7-1-2019

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.

Item Details

Item Type:Refereed Article
Keywords:scientific drilling, quaternary, Darwin Crater
Research Division:Earth Sciences
Research Group:Atmospheric Sciences
Research Field:Climate Change Processes
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Ecosystem Adaptation to Climate Change
UTAS Author:Pedro, JB (Dr Joel Pedro)
ID Code:137179
Year Published:2019
Deposited By:Oceans and Cryosphere
Deposited On:2020-02-04
Last Modified:2020-02-19
Downloads:0

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