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AIG Victoria Branch News

Activities of the Vic branch of the AIG during the first half of 2014 comprised a series of monthly technical talks, which have included such esoteric subjects as the geology of various gold deposits from China to Nevada – and computer applications and remote sensing.

The latest talk was by Bruce Kay (see Fig 1), now Technical Director at Catalyst Metals Ltd, who gave a gripping and most entertaining description of his adventurous ride with Normandy.

Bruce Kay

Bruce Kay addressing the Victorian Branch meeting on 12th August 2014

 

AIG Members 2

AIG Members

AIG members assembling at Basement on View for Bruce Kay’s talk

Additional monthly technical talks are locked-in for the balance of the year, but also well-advanced are plans for next month’s ‘New Perspectives’ workshop1 that will focus on the geology and metallogeny of the southeast Lachlan Fold Belt (a JV with AusIMM).  Further details are available via the listing in the AIG Events Calendar.

The Victorian branch also plans to visit to the Australian Synchrotron, and in conjunction with the IAH will have a field trip around the Ballarat area in late November (the details of which will be announced in due course).

Geoff Hodgson,
AIG Victoria Branch Secretary

 

Dynamics of Continental Accretion

A letter published in Nature 508, 245-248 (10th April, 2014) by researchers at Monash University and the Geological Survey of Victoria on mathematical modelling of crustal elements involved in continental collision and subduction, can be applied to the understanding of the development of the Macquarie Arc and the evolution of the Tasmanides in SE Australia.

Subduction zones, where one plate dives under another, become congested when they try to accommodate buoyant, exotic crust. Louis Moresi et al. describe new numerical models of continental accretion that follow the entire process from the initial collision state, through a period of plate margin instability, to the re-establishment of a stable convergent margin. The models illustrate how significant curvature of the orogenic system develops, as well as the mechanism for tectonic escape of the back arc region.

The videos of a series of models help to visualise the Orocline Model developed by Ross Cayley and co-workers at the GSV in reconstructing the Lachlan Fold Belt.

You can read the abstract of the article and watch videos on http://bit.ly/1sYVPTC, or see videos uploaded by Professor Louis Moresi on You Tube athttps://www.youtube.com/watch?v=cVulRP2tUGM (this video can be applied to the Lachlan if considered to be viewed from the north-west).