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AusLAMP in the Tasmanides: Lithospheric architecture and mineral potential from magnetotellurics

 

A webinar from ASEG

Date: Wednesday 9 September, 3pm

Presenter: Dr Alison Kirkby (Geoscience Australia)

Title: AusLAMP in the Tasmanides: Lithospheric architecture and mineral potential from magnetotellurics

Abstract: This presentation will showcase a recently released resistivity model of the southeast Australian lithosphere from Australian Lithospheric Architecture Magnetotelluric Project (AusLAMP) data collected over the last 7 years in collaborations between GA, GSNSW, GSV, GSSA and the University of Adelaide. For the first time, we image conductive regions at and below the base of the crust (greater than 35 km depth) that may represent fossil fluid pathways along the Australian continental margin ~440 to 380 million years ago. The geometries of these conductive regions match those revealed in the upper crust by potential field and passive seismic data, and are a key part of crustal architecture predicted by the Lachlan Orocline model for the evolution of the southern Tasmanides. Conductive regions in the lower crust also correlate with known gold deposits, which may help to guide future mineral exploration in southeast Australia.