WESTERN AUSTRALIAN DIVISION
West Australian Geologist (WAG)
Bi-monthly newsletter of the Western Australian Division of the Geological Society of Australia Inc.
Number 517: June ̶ July 2016 (2.3 Mb PDF file)
Governing Council Election Process 2016
Council Election Process download: PDF doc
Nomination form - WA Divisional Councillor 2016-2018 download: MS Word doc
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 August, 2016
Talk title: The experimental modelling of geochemical processes in the deep Earth: the oxidation state of subducted, altered oceanic crust and the formation of diamonds
Speaker: Dr Prokopiy Vasilyev, Postdoctoral Research Associate, Curtin University
Abstract: The When field observations are not enough to understand geological processes, experimental petrology (or geochemistry) can come in handy to study Earth, its evolution and mineral wealth. A wide range of experimental instruments are capable of synthesizing material of interest (mineral, glass, alloy etc.) and modelling natural processes in required temperature-pressure-composition space. Including processes at very high pressure, such as diamond formation and its stability at the Earth mantle conditions.
Eclogitic xenoliths from kimberlite pipes are occasionally diamond-bearing, and are often interpreted as having an origin as subducted oceanic crust. The existence of diamonds in these rocks constrains equilibrium temperatures and pressures of some eclogites to the upper mantle. However, the additional critical parameter controlling the stability of diamonds, oxygen fugacity (ƒO2), is unknown in eclogitic assemblages. A series of piston-cylinder experiments were conducted using model carbonate and kyanite bearing eclogite assemblages to determine the ƒO2 of the limiting reaction for carbonate vs. diamond (graphite) as a function of pressure (P=3.5-6 GPa) and temperature (T=900-1300C). The experimental data allowed calibration of two redox reactions, which were employed to estimate ƒO2 of diamond, kyanite and coesite bearing eclogite xenoliths from Udachnaya kimberlite pipe, Yakutia, Russia.
The talk will also cover the possibilities of experimental geochemistry laboratory at Curtin University and the highlights of ongoing projects in the lab.
About the speaker: Prokopiy holds a BSc and MSc in Geology from Moscow State University (2009 and 2011) and recently completed a PhD at Australian National University. He joined Curtin University as a Postdoctoral Research Associate earlier this year.
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
2016 GSA-WA Division AGM Minutes
The GSA-WA Division 2016 Annual General Meeting was held at the Irish Club, Subiaco on Wednesday 4 May 2016.
2016 Gibb Maitland Medal
Call for Nominations - Now Closed
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 2016 Gibb Maitland medalist.
2016 Gibb Maitland guidelines & nomination form download: MS Word doc
Nominations closed Monday 30 November 2015 and the winner was Professor Kliti Grice.
modified: 28 July 2016