WESTERN AUSTRALIAN DIVISION
Open for the ANNUAL DINNER & 62nd AWARD PRESENTATION
for 7:30pm start
Cost: $65 for members plus one guest at member rate, $85 for non members and $40 for student members
For more details
and registration see link below:
RSVP: Sunday 26th April, 2015
A Geological Field Trip to the Capes Region of Southwest WA
By popular demand John Bunting, author of ‘A Geological Field Guide to the Capes Region of Southwest WA’ will be supporting a field trip to the Southwest.
Date: Saturday the 16th to Sunday the 17th of May, 2015
Starting Location: Dunsborough boat ramp
Cost: $33 (GSA members) or $44 (non-members)
NOTE: Participants will be required to arrange their own transport, accommodation and meals.
West Australian Geologist (WAG)
Bi-monthly newsletter of the Western Australian Division of the Geological Society of Australia Inc.
Number 511: April ̶ May 2015 (1.9 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 1st April, 2015
Talk title: Transport of metals and sulphur in magmas by flotation of sulphide melt on vapour bubbles
Speaker: Dr James Mungall, Associate Professor, University of Toronto, Canada
Abstract: Emissions of sulphur and metals from magmas in Earth’s shallow crust can have global impacts on human society. Sulphur-bearing gases emitted into the atmosphere during volcanic eruptions affect climate and metals and sulphur can accumulate in the crust above a magma reservoir to form giant copper and gold ore deposits, as well as massive sulphur anomalies. The volumes of sulphur and metals that accumulate in the crust over time exceed the amounts that could have been derived from an isolated magma reservoir. They are instead thought to come from injections of multiple new batches of vapour- and sulphide-saturated magmas into the existing reservoirs. However, the mechanism for the selective upward transfer of sulphur and metals is poorly understood because their main carrier phase, sulphide melt, is dense and is assumed to settle to the bottoms of magma reservoirs. Here we use laboratory experiments as well as gas-speciation and mass-balance models to show that droplets of sulphide melt can attach to vapour bubbles to form compound drops that float. We demonstrate the feasibility of this mechanism for the upward mobility of sulphide liquids to the shallow crust. Our work provides a mechanism for the atmospheric release of large amounts of sulphur, and contradicts the widely held assumption that dense sulphide liquids rich in sulphur, copper and gold will remain sequestered in the deep crust.
About the speaker: James Mungall received a BSc in Geology from the University of Waterloo in 1987 and then did MSc and PhD theses at McGill University. His early interests in rare subalkaline intrusions gradually morphed into a fascination for non-equilibrium processes in magmatic systems, which he pursued in his postdoctoral research at the Bayerisches Geoinstitut. In 1996 the world of mineral exploration tempted him away from academia for a couple of years until in 1999 he found a niche at the University of Toronto where he could apply field, theoretical, and experimental approaches to the study of magmatic ore deposits. After spending several field seasons combining consulting and research on Ni-Cu-PGE deposits in northern Canada he took a one year leave of absence in 2008-09 to serve as Chief Geologist at Noront Resources Ltd, overseeing the geological staff working on Ni-Cu-PGE, Cr and Fe-Ti-V deposits in the McFaulds Lake area of Ontario. He has since returned to the University of Toronto, where he holds the Norman Keevil Chair in Ore Genesis.
Wednesday 6th May, 2015
Talk title: Connecting Mineral Systems and Lithospheric Architecture – The Greenfields Frontier
Speaker: Dr Graham C Begg1,2, 1Minerals Targeting International PL, 2ARC Centre of Excellence for Core to Crust Fluid Systems/GEMOC
Abstract: Greenfields Exploration is in crisis. A long term falling success rate has helped fuel falling expenditures in recent times. A breakthrough in exploration success will require breakthrough capabilities in both Prediction (targeting) and Detection that open up new search space and restore confidence in the sector.
Advances in geoscience over the last 20 years in disciplines such as geochronology, seismology, mantle petrology, electrical geophysics (e.g. magnetotellurics), and geochemistry (e.g. isotopic and trace element analysis), coupled with continental- and global- scale datasets (e.g. geology, topography, gravity, magnetics, passive seismic, remote sensing) and powerful visualisation and interrogation platforms (e.g. GIS), have given us the opportunity to revolutionise our understanding of the continental lithosphere. This revolution is now at an advanced stage. We can map both crustal and Sub-Continental Lithospheric Mantle (SCLM) architecture, history and geodynamic evolution to a resolution in space and time that is relevant to understanding metallogeny and the exploration targeting of ore deposits. We find that Archean SCLM volumetrically dominates continents, lurking beneath many younger crustal terranes. This ancient inherited architecture and composite history has a profound influence on younger crustal architecture and geological events.
A Mineral Systems approach to understanding ore deposits involves consideration of the processes that are involved in deposit formation. Exploration involves the search for symptoms of these processes, with each symptom expressed in the signals in geoscience data. Increasingly we are understanding that large Mineral Systems operate at the scale of the entire lithosphere (e.g. Griffin et al., 2013, Nature Geoscience 6, 905-910). We are now in a unique position to couple a Mineral Systems approach with a new understanding of lithospheric architecture, and forge a new frontier in Greenfields discovery.
About the speaker: Graham Begg has 30 years experience in the mining and minerals exploration sector, with WMC, BHP, and his own consulting company Minerals Targeting International (MTI). He has a PhD in tectonics and ore deposit geology. Since 2002 he has also spearheaded research in collaboration with Macquarie University aimed at creating the first detailed global understanding of the architecture and history of the full continental lithosphere (crust and mantle), and hopes to thereby facilitate a breakthrough in greenfields mineral discovery. In 2008 he commercialised this Intellectual Property through MTI. He is a passionate advocate for innovation in the exploration sector.
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 will be announced shortly.
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: 30 March 2015