Do all Archaean TTG rock compositions represent former melts
TLDR
In this article, the authors argue that the diversity in chemical composition in granitoids of the tonalite-trondhjemite-granodiorite suite (TTG) is primarily the product of crystal fractionation, specifically plagioclase and hornblende fractionation.About:
This article is published in Precambrian Research.The article was published on 2021-12-01 and is currently open access. It has received 13 citations till now. The article focuses on the topics: Limpopo Belt & Lewisian complex.read more
Citations
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The origin of early continental crust: New clues from coupling Ge/Si ratios with silicon isotopes
TL;DR: In this article , the authors use the Ge/Si ratio as a complementary tracer to δ30Si in order to delineate the exact role of modal quartz and silicified basalts from the Archean seafloor among the primary controls of the early appearance of felsic melts on Earth.
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3.63 Ga grey gneisses reveal the Eoarchaean history of the Zimbabwe craton
TL;DR: In-situ zircon Hf isotope compositions reveal the interplay between episodes of juvenile magma addition, crustal thickening and crustal differentiation as mentioned in this paper , validating the existence of Eo-to-Palaeoarchaean crust.
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Coexisting divergent and convergent plate boundary assemblages indicate plate tectonics in the Neoarchean
TL;DR: In this article , the authors document temporally and spatially-associated Neoarchean (2.55-2.51 Ga) rock assemblages with mid-ocean ridge and supra-subduction-zone origins from the Angou Complex, southern North China Craton.
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Fe isotopic evidence that “high pressure” TTGs formed at low pressure
TL;DR: In this article , the authors report new Fe isotopic analyses for ca. 2.5 Ga diorites and TTGs with compositions typically interpreted to reflect a high-pressure affinity in eastern Hebei Province of the North China craton.
References
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Journal ArticleDOI
Crustal contributions to arc magmatism in the Andes of Central Chile
Wes Hildreth,Stephen Moorbath +1 more
TL;DR: In this article, 15 andesite-dacite stratovolcanoes on the volcanic front of a single segment of the Andean arc show along-arc changes in isotopic and elemental ratios that demonstrate large crustal contributions to magma genesis.
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Experimental investigations of the role of H2O in calc-alkaline differentiation and subduction zone magmatism
TL;DR: The phase relations of natural aphyric high-alumina basalts and their intrusive equivalents were determined through rock-melting experiments at 2 kb, H2O-saturated with fO2 buffered at NNO.
Journal ArticleDOI
Partial melting of amphibolite/eclogite and the origin of Archean trondhjemites and tonalites
TL;DR: In this article, a series of vapor-absent (i.e., Pfluid < Ptotal) melting experiments on four natural basaltic compositions were conducted at 8, 16, 22 and 32 kbar in order to assess the validity of models for the origin of Archean granitoids which assume a mafic crustal source.
Journal ArticleDOI
Dehydration Melting and Water-Saturated Melting of Basaltic and Andesitic Greenstones and Amphibolites at 1, 3, and 6. 9 kb
James S. Beard,Gary E. Lofgren +1 more
Book ChapterDOI
Trondhjemite: Definition, Environment and Hypotheses of Origin
TL;DR: In this article, the IUGS definition of trondhjemite as leucotonalite was followed, except that andesine-bearing leucomorphalite be termed calcic trondhmite.