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PESA Vic/Tas March Technical Meeting – Chemostratigraphy of the onshore Otway Basin

Wednesday, 18 March, 2020 @ 12:00 pm - 2:00 pm (Australia/Melbourne time)

$30.00 – $80.00

Guest Speaker(s): Anne Forbes, Chemostrat Australia

Anne has a Bachelors (Hons) and MSci from the University of Cambridge in Geology and a PhD from the Open University in Volcanology. For her PhD she studied the interaction of lava flows with ice and water, involving elemental and molecular geochemistry, fracture analysis, and extensive field work in Iceland. She joined Chemostrat Australia in January 2014 and has since undertaken chemostratigraphy studies in most of Australia’s principal petroleum producing basins. She is a member of PESA and the Geological Society of London.

Sedimentary rocks typically have variable inorganic geochemistry, even in apparently uniform successions. This is driven by subtle changes in mineralogy, often associated with accessory phases such as heavy minerals, but also by the type and abundance of framework grains (lithics and feldspars for example). Chemostratigraphy is based on the characterisation of sedimentary rocks using elemental data (bulk-rock inorganic geochemistry) to detect these changes. Discrete packages of sediment are identified based on geochemical trends and these are then correlated across wells.

Chemostrat Australia recently completed an extensive chemostratigraphy study in the Victorian onshore Otway Basin for the Geological Survey of Victoria (GSV). This talk highlights some of the key findings from this work which covers the majority of formations penetrated in the onshore Otway Basin across 11 wells.

Thirty-seven chemically distinct packages were identified and chemostratigraphic interpretation allowed correlation of units regardless of lithology. Some of the key findings include the division of the Crayfish Subgroup and correlation into South Australian wells, and a subdivision and correlation of the Eumeralla Fm. The data also allow for assessment of the nature and evolution of the volcanogenic component of the basin fill in the Otway Group.

This talk will be accompanied by a Short Course, also presented by Anne Forbes, on Wednesday 18th March.PESA 20PESA Student10



Wednesday, 18 March, 2020
12:00 pm - 2:00 pm
(Australia/Melbourne time)
$30.00 – $80.00
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    Henry & The Fox
    525 Little Collins Street
    Melbourne, Victoria 3000 Australia
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