1.6 Ga crustal thickening along the final Nuna suture
Newly published results in GEOLOGY outline the evidence for the collision of proto-Australia and Laurentia during the final assembly of supercontinent Nuna.
New research backs ‘lull’ in the geologic record, Earth’s mid-life crisis
Published in Nature Geoscience, recent research backs claims that the Earth experienced a ‘geological lull’ in its development around 2.3 to 2.2 billion years ago.
Supercontinent Nuna formed in two stages
Recent results from the eastern Kimberley craton produced a well defined paleopole for the 1.8 Ga Hart Dolerite. Comparing this with existing data from proto-Australia and Laurentia between 1800-1400 Ma suggests that there were two stages of assembly between Australia and Laurentia during the assembly of Nuna.
A piece of America found in northern Australia: Legacy of the 1.6-billion-year-old supercontinent Nuna
Some recently published results in the journal GEOLOGY links North Queensland to North America at 1.6 billion years ago during the supercontinent Nuna.
The formation of mantle “lone plumes”
The Hainan plume has been used as an example to investigate the feasibility of lone plumes being generated by subducting slabs in the mantle downwelling zone using 3D geodynamic modelling.
An Australian source for Pacific-Gondwana zircon
Research published in the journal GEOLOGY revealed the Paterson-Petermann Orogen of Central Australia to be the major source for the “characteristic Pacific-Gondwana zircons”.
Finding melted mud in the mantle
Sediment abundance in mantle-derived melt is generally low and difficult to detect. Granite sampled from an exhumed mantle section found in the Oman-UAE ophiolite has provided evidence for the melting of subducted sediment.
LIP barcoding the Yilgarn Craton
A newly identified, NW-trending, mafic dyke swarm (Boonadgin dyke swarm, 1.9 Ga) in southwestern Yilgarn Craton raise the possibility of a link with India.
Lower mantle influence on geomagnetic field reversals
While paleomagnetic data is generally used to reconstruct the continental blocks throughout Earth’s history there are other ways to deduce valuable information from the changing geomagnetic field on the long term evolution of the Earth.