Encyclopedia of Astrobiology

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| Editors: Muriel Gargaud, William M. Irvine, Ricardo Amils, Henderson James Cleaves, Daniele Pinti, José Cernicharo Quintanilla, Michel Viso

Tonalite-Trondhjemite-Granodiorite

  • Hervé MartinEmail author
  • Nicholas Arndt
Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27833-4_1620-5

Synonyms

TTG

Definition

Tonalite-trondhjemite-granodiorite (or TTG suite, a term coined by Jahn et al. 1981) is an association of rocks that compose a large part of Archean continental crust. It is widely accepted that this rock suite formed by melting of hydrous metabasalts at high pressure, yet the geodynamic setting in which this melting took place is discussed. Two main sources of melt are proposed: (1) basaltic material that was previously underplated beneath thickened crust (e.g., Smithies 2000) and (2) basaltic rocks in subducting oceanic slabs that melted in a hotter Archean mantle (e.g., Martin et al. 2005).

Overview

About 90 % of the juvenile continental crust generated between 4.0 and 2.5 Ga belongs to the “TTG suite” (tonalite, trondhjemite, granodiorite) (Jahn et al. 1981; Moyen and Martin 2012), although in some cratons (e.g., Yilgarn Craton, Australia; Champion and Sheraton 1997), high-K monzodioritic and syenogranitic rocks can also be abundant. Most of these rocks are...

Keywords

Archean Eon 
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References and Further Reading

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  3. Champion DC, Sheraton JW (1997) Geochemistry and Nd isotope systematics of Archaean granites of the eastern Goldfields, Yilgarn Craton, Australia: implications for crustal growth processes. Precambrian Res 83(1–3):109–132CrossRefGoogle Scholar
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  5. Foley SF, Tiepolo M, Vannucci R (2002) Growth of early continental crust controlled by melting of amphibolite in subduction zones. Nature 417:637–640CrossRefGoogle Scholar
  6. Jahn BM, Glikson AY, Peucat J-J, Hickman AH (1981) REE geochemistry and isotopic data of Archaean silicic volcanics and granitoids from the Pilbara block, Western Australia: implications for the early crustal evolution. Geochim Cosmochim Acta 45:1633–1652CrossRefADSGoogle Scholar
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  9. Martin H, Moyen J-F (2002) Secular changes in TTG composition as markers of the progressive cooling of the earth. Geology 30:319–322CrossRefADSGoogle Scholar
  10. Martin H, Smithies RH, Rapp R, Moyen J-F, Champion D (2005) An overview of adakite, tonalite-trondhjemite-granodiorite (TTG), and sanukitoid: relationships and some implications for crustal evolution. Lithos 79(1–2):1–24CrossRefADSGoogle Scholar
  11. Moyen J-F, Martin H (2012) Forty years of TTG research. Lithos 148:312–336CrossRefADSGoogle Scholar
  12. Rapp RP, Watson EB (1995) Dehydration melting of metabasalt at 8–32 kbar: implications for continental growth and crust-mantle recycling. J Petrol 36(4):891–931CrossRefGoogle Scholar
  13. Rapp RP, Shimizu N, Norman MD, Applegate GS (1999) Reaction between slab-derived melts and peridotite in the mantle wedge: experimental constraints at 3.8 GPa. Chem Geol 160:335–356CrossRefGoogle Scholar
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  15. Rapp R, Norman M, Laporte D, Yaxley G, Martin H, Foley S (2010) Continent formation in the Archean and chemical evolution of the cratonic lithosphere: melt-rock reaction. Experiments at 3–4 GPa and petrogenesis of Archean Mg-diorites (sanukitoids). J Petrol 51(6):1237–1266CrossRefGoogle Scholar
  16. Smithies RH (2000) The Archaean tonalite-trondhjemite-granodiorite (TTG) series is not an analogue of Cenozoic adakite. Earth Planet Sci Lett 182:115–125CrossRefADSGoogle Scholar
  17. Smithies RH, Champion DC (2000) The Archaean high-Mg diorite suite: links to tonalite-trondhjemite-granodiorite magmatism and implications for early Archaean crustal growth. J Petrol 41(12):1653–1671CrossRefGoogle Scholar
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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Laboratoire Magmas et VolcansUniversité Blaise Pascal, OPGC, CNRS, IRDClermont-FerrandFrance
  2. 2.Maison des GéosciencesLGCA, Université J. FourierSt-Martin d’HèresFrance