Encyclopedia of Astrobiology

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


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




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).


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...


Archean Eon 
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References and Further Reading

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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