WESTERN AUSTRALIAN DIVISION
West Australian Geologist (WAG)
Bi-monthly newsletter of the Western Australian Division of the Geological Society of Australia Inc.
Number 512: June ̶ July 2015 (0.9 Mb PDF file)
Time: 5.30 pm for 6.00 pm formal start (bar open upstairs before talk)
Venue: Irish Club of WA,
NEXT MONTHLY MEETING
Wednesday 3rd June, 2015
Talk title: Gold deposition and remobilisation in the Archaean Witwatersrand basin, South Africa – A pyrite perspective
Speaker: Dr Andrea Agangi, Dept. of Applied Geology, Curtin University
Abstract: The origin of Au-U deposits in the Archaean Witwatersrand basin of South Africa is the subject of longstanding discussion. The two main models, the ‘modified placer’ and the ‘hydrothermal model’ imply opposite views on the formation of gold and pyrite in the metaconglomerates that host mineralisation. These two models have far reaching implications on the palaeoenvironmental conditions in the Archaean. New results presented in this talk provide evidence for the contemporaneous formation of sedimentary pyrite and gold deposition, and suggest a possible link between biogenic activity and gold accumulation in the Witwatersrand basin.
About the speaker: Andrea Agangi has a background in igneous petrology and ore deposits geology. He received a PhD from CODES – University of Tasmania and then moved to the University of Johannesburg, South Africa, to study Archaean gold deposition and felsic magmatism in the Barberton Greenstone Belt and the Witwatersrand basin. He has joined Curtin University in 2014 as a Post-Doctoral Fellow to work on ore mineralisation of the Proterozoic Capricorn Orogen.
Wednesday 1st July, 2015
Talk title: Enigmatic events in the evolution of the North West Shelf
Speaker: Professor Chris Elders, Chevron Professor of Petroleum Geology, Curtin University
Abstract: The North West Shelf of Australia is an unusual passive margin – it is exceptionally long-lived with a history of several rift and “break-up” events that each imparts structural fabrics which influence the architecture of subsequent events. It is also unusual in the sense that high quality seismic data acquired for hydrocarbon exploration is readily available in the public domain, encouraging extensive study. While younger deformational events are most clearly imaged on high resolution 3D seismic data, the detailed fault patterns they reveal are indicative of the influence of underlying structure as well as the tectonic environment in which they formed. While the broad pattern of the evolution of the margin is well established, a number of issues are still to be resolved. Late Carboniferous-Permian extension is regarded as the most significant event in the formation of the margin, but is also the most difficult to observe on conventional seismic profiles due to the depth at which such intervals occur, other than on the flanks of the Northern Carnarvon and Browse Basins. Mesozoic rifting is much more evident, but its relationship to the enigmatic “Fitzroy Movement” is confusing – an issue that high resolution 3D seismic data may help to address. Separation of Greater India from Australia in the Lower Cretaceous imparted a final phase of extensional deformation, although its expression in terms of uplift associated with the Valanginian unconformity is not simple.
About the speaker: Chris Elders joined Curtin in October 2013 as Chevron Professor of Petroleum Geology. Prior to that, he spent 20 years at Royal Holloway, primarily responsible for running the MSc in Petroleum Geoscience. By the end of his time there, it was delivered on campus, by distance learning and in Russia,through a partnership with Tyumen State Oil and Gas University. Prior to that he spent four years as an exploration geologist with Shell in the Netherlands which followed the completion of undergraduate and postgraduate degrees at Oxford University.
GSA-WA Student Bursary
The GSA-WA offers bursaries to assist students in their studies and research.
Up to $1000 can be granted for any meritorious project, for 1 or several students, such as field trips, for laboratory costs, for travel costs or conferences.
Applications close 31 March and 30 September each year.
View the flyer for further information and complete the application form to submit a nomination.
Bursary Flyer download: PDF doc
Bursary Application Conditions download: MS Word doc
Bursary Application Form download: MS Word doc
2015 Gibb Maitland Medal
The Gibb Maitland Medal is awarded by the Western Australia Division of the Geological Society of Australia in order to recognize individuals who have made substantial contributions to geoscience in Western Australia. It is named for Andrew Gibb Maitland, Government Geologist from 1896 to 1926, who established the Geological Survey of Western Australia. The Medal is usually awarded each year and nominations are now sought for the 2015 Gibb Maitland medallist.
2015 Gibb Maitland guidelines & nomination form download: MS Word doc
Nominations closed Monday 1 December 2014 and the winner was Dr Graham C Begg.
2014 GSA-WA Division AGM Minutes
The GSA-WA Division 2014 Annual General Meeting was held at the Irish Club, Subiaco on Wednesday 2 April 2014.
modified: 29 May 2015