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137179 - Scientific drilling of sediments at Darwin Crater, Tasmania.pdf (15.09 MB)

Scientific drilling of sediments at Darwin Crater, Tasmania

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posted on 2023-05-20, 10:29 authored by Lise-Pronovost, A, Fletcher, M-S, Mallett, T, Mariani, M, Lewis, R, Gadd, PS, Herries, AIR, Blaauw, M, Heijnis, H, Hodgson, DA, Joel PedroJoel Pedro
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.

History

Publication title

Scientific Drilling

Volume

25

Pagination

1-14

ISSN

1816-8957

Department/School

Institute for Marine and Antarctic Studies

Publisher

Copernicus GmbH

Place of publication

Germany

Rights statement

Copyright 2019 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

Repository Status

  • Open

Socio-economic Objectives

Ecosystem adaptation to climate change; Effects of climate change on Antarctic and sub-Antarctic environments (excl. social impacts); Effects of climate change on Australia (excl. social impacts)

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