CMC Metals Ltd Initiates Drilling at its Silverknife Property, North-Central British Columbia torontotelegraph.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from torontotelegraph.com Daily Mail and Mail on Sunday newspapers.
The Finke River in central Australia is counted among the world's oldest drainage systems; this raises the prospect of investigating how (tectonic and sub-lithospheric) processes have shaped the landscape in the long term. The Finke's upper reaches display an enigmatic set of intertwined active and relict bedrock gorges that suggest a complex history of incision, aggradation and re-incision. We measured cosmogenic 10Be and 26Al in fluvial gravels preserved in the gorges, and we applied a Markov chain-Monte Carlo-based inversion model to test two limiting-case hypotheses about the timing of gravel deposition and exhumation. Our results suggest that the nuclide memory contained within the gravels was essentially erased during sediment storage exceeding several million years. Previous studies attribute central Australia's geomorphic development to intensified post-Miocene aridity in tune with the perception of a quiescent tectonic regime. However, the close correlation betw