- This event has passed.
LIVE WEBINAR – End Permian Armageddon asteroid cluster that almost ended life on Earth. Climate change on steroids. Impact on the prospectivity of the Bedout Subasin and surrounds, GNWS, Western Australia
Tuesday, 6 October @ 11:00 am - 12:00 pm (Australia/Perth time)Free – $10
Kindly supported by Rock Flow dynamics
This live webinar will take place at:
11am – Perth
12.30pm – Adelaide and Darwin
1pm – Brisbane, Canberra, Hobart, Melbourne, Sydney
Use the calendar link on this page to add this event in to your own calendar at the correct local time for your location.
Tickets are free for members (please log in to see this) and $10 for non members.
Please buy your tickets and immediately follow the link in the ticket e-mail (not the calendar invite or this webpage, which is just generic and not event specific) to set up your registration with the webinar software well in advance of the time of the talk. Once registered with the webinar software you will receive a reminder e-mail 1 hr beforehand.
End Permian Armageddon asteroid cluster that almost ended life on Earth. Climate change on steroids. Impact on the prospectivity of the Bedout Subasin and surrounds, GNWS, Western Australia
Presented by Dariusz Jablonski
Australia has several well-documented possible impact structures, both onshore and offshore, and the Bedout High in the offshore Canning Basin, may also have an impact origin.
Using high-resolution modern seismic surveying we identify two penecontemporaneous possible impact structures in the region of the Bedout High. The main Bedout High forms a north-south elongated feature, 150 kms long and 60 kms wide whereas the Bedout East structure is circular, 25 kms in diameter, and illustrates classic impact edge, internal ribbing and concentric fractures superimposed on the pre-existing Palaeozoic structural fabric.
The Bedout High illustrates basement uplift with radiating faults that mimic the elongated dome. Most of these faults terminate at the Permian/Triassic (P/Tr) boundary. On the north-eastern flank of the Bedout High, above the P/Tr boundary, we identify a 4 km-thick sedimentary wedge with numerous volcanic intrusions, which we interpret to be an erosional product when the Bedout area rebounded as a result of the impacts. Volcanics intersected in this zone are also associated with a number of mantle-induced magma domes that began to grow and uplift at the same time (e.g. Tres Hombres/ Raglin structure).
On a global scale, the Bedout impacts may be a part of an asteroid swarm that hit the southern hemisphere within a very short period. The 40 km-diameter Araguainha crater identified onshore Brazil and possibly the 75 km-diameter Gnargoo crater in the Southern Carnarvon Basin may be related to the events observed in the Bedout area. A cluster of at least 3 impactors may explain the severity and global nature of the latest Permian Triassic Main Extinction (PTME) event.