Deep mantle unveils a two-faced Earth
Research led by scientists in the Earth Dynamics Research Group, and published in Nature Geoscience, suggests that the Earth has two chemically distinct hemispheric ‘faces’ or domains.
Early whole mantle remixing suggests a start of global plate tectonics before three billion years ago
New work, published in the journal Scientific Reports, found that after the initial chemical stratification and formation of a hard shell in the first billion years of our planet’s history, there was a major chemical ‘stir-up’ some 3.2 billion years ago.
The formation of continental crust — just add water!
A recently published Nature Geoscience article outlines the critical importance of water in the melting that occurs in subduction zones. This work, lead by Prof. Bill Collins, also discusses how this fluid-fluxed melting influences the mineralogical and geochemical signatures of the continental crust.
Shall we dance — taking a 600 million year–long step at a time
Two recent articles, in Nature Communications and Geology, published by our team working on Oceanic Large Igneous Provinces (O-LIPs) point to a synchronised behaviour between tectonic plates and Earth’s deep mantle.
Cr-spinel records metasomatism not petrogenesis of mantle rocks
A recent Nature Communications article by PhD student Hamed Gamal El Dien questions the use of chromium spinel as a robust petrogenetic indicator and instead argues that it can be utilised as a tracer for metasomatic processes.
What does it take to break up a supercontinent?
The Earth Dynamics Research Group’s geodynamic modeling team recently published results of a new 4D model evaluating the effect of pre-existing orogens in the lithosphere on the supercontinent breakup process.
Major shoreline retreat following Snowball Earth
A recent article, published in Terra Nova, reports a new interpretation of the observed carbonate rocks that overlay the Cryogenian glacial deposits and supports the rapid deglaciation of Snowball Earth.
Origin of arc magmatic signatures
A new paper in Nature Scientific Reports by one of our PhD students. This article outlines the role of serpentinites for the systematic distribution of fluid-mobile elements and rare earth elements in subduction zones.
Glacial incisions of the snowball Earth
There are surprisingly few lines of geological evidence for glacial incisions associated with a snowball Earth scale event that are not controversial. A recent article published by members of the Earth Dynamics Research Group reports multiple lines of geological field evidence for deep but variable glacial erosion during the Sturtian glaciation (ca. 717‐659 million years ago, Ma).
Decoding the Earth’s rhythms
The supercontinents appear to have assembled and broken up through alternating processes of ‘introversion’ and ‘extroversion’. The process spans twice the period of the supercontinent cycle and involves either the survival or regeneration of superoceans and the subduction girdle. This research has been published in Precambrian Research.
Insights into the Tibetan Plateau
A recent Tectonics article provides new insight into the nature and evolution of the Tibetan Plateau. This work focuses on the Longmenshan Fault Zone (LFZ), a tectonic boundary between the Tibetan Plateau and the Sichuan Basin of the South China Block.
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.