Publication Name: Australasian Exploration Geoscience Conference 2019
Authors: Steve Abbott*, Claire Orlov, George Bernardel, Nadege Rollet, Duy Nguyen, Merrie-Ellen Gunning, Chris Nicholson
Date Published: September 2019
Number of Pages: 6
Abstract:
Triassic deposition on the central North West Shelf (CNWS) mainly took place in a large depocentre comprising the Beagle Sub-basin and the Exmouth Plateau, and a small depocentre located within the Rowley Sub-basin. Thermal subsidence prevailed but syn-depositional extension is especially evident in the NE Barcoo Sub-basin. Sources of sediment delivery to the region included two re-entrants that extended into the Canning Basin. During time Interval 1 (Induan–mid-Anisian) a basal marine mudstone transgressed the region and fluvio-deltaic systems were confined inboard. Local deep incision at the start of Interval 2 (mid Anisian–mid-Landinian) was followed by extensive fluvio-deltaic deposition. During Intervals 3 (mid-Ladinian–early Rhaetian) and 4 (Rhaetian), the fluvio-deltaic system progressively back-stepped and was replaced in outboard areas by deposition of carbonate-rich platform sediments.