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The high pressure TTGs have experienced geotherms lower than 10 °C/km, which are close to modern hot subduction geotherms experienced by young slabs (but around 3 °C/km hotter than other modern subduction zones), whilst the geotherms for the most abundant TTG subseries, medium pressure group, are between 12 and 20 °C/km. [8] Other than hot ...
The BGB consists of locally derived sediments and chemical sediments, but is composed mostly of TTGs and greenstones, as briefly discussed above. [5] Three main lithostratigraphic units are used to divide the BGB. The base contains the Onverwacht, followed by the Fig Tree, and the topmost Moodies Groups. [5]
Location of the Barberton Greenstone Belt. The Barberton Greenstone Belt is a geologic formation situated on the eastern edge of the Kaapvaal Craton in South Africa.It is known for its gold mineralisation and for its komatiites, an unusual type of ultramafic volcanic rock named after the Komati River that flows through the belt.
The processes that form TTGs are debated. Some authors attribute TTG formation to subduction activity, [8] while others attribute the origin of these melts to the direct melting of the lithosphere by mantle plumes. [9] The debate of the origin of the TTGs is a key topic in the debate of when plate tectonics began. [9]
There were two phases forming TTGs, with the first stage at about 2.53 billion years ago [26] and the second one at between 2.52-2.48 billion years ago. [20] [27] The sanukitoid in this terrane formed between the two phases of TTG formation, at about 2.53-2.52 billion years ago. [20] [27]
Antibodies to tissue transglutaminase (abbreviated as anti-tTG or anti-TG2) are found in patients with several conditions, including celiac disease, juvenile diabetes, [1] inflammatory bowel disease, [2] and various forms of arthritis.
The Acasta orthogneisses of the Slave Craton, Canada, are regarded to be the oldest rocks on Earth, dated to 4.06 Ga, include protoliths such as TTGs, amphibolite, gabbro, granite, and diorite. It is possible that such early Hadean TTGs were a source of phosphorus for the first oceans and therefore contributed nutrients to the first abiogenic ...
The source merge S = M(X,Y) of two TTGs X and Y is a TTG created from the disjoint union of graphs X and Y by merging the source of X with the source of Y. The source and sink of X become the source and sink of S respectively. An SPQR tree is a tree structure that can be defined for an arbitrary 2-vertex-connected graph. It has S-nodes, which ...