Hafnium isotope evidence from Archean granitic rocks for deep-mantle origin of continental crust

Martin Guitreau, Janne Blichert-Toft, Hervé Martin, S. Mojzsis, Francis Albarède

Research output: Contribution to journalArticle

87 Citations (Scopus)

Abstract

Combined whole-rock and zircon MC-ICP-MS Lu-Hf isotope data are reported for a large collection of Archean granitoids belonging to typical tonalite-trondhjemite-granodiorite (TTG) suites. Our data demonstrate that the time-integrated Lu/Hf of the mantle source of TTGs has not significantly changed over the last 4Gy. Continents therefore most likely grew from nearly primordial unfractionated material extracted from the deep mantle via rising plumes that left a depleted melt residue in the upper mantle. The deep mantle could retain its primitive relative element abundances over time because sinking plates are largely stripped barren of their oceanic and continental crust components at subduction zones; this process results in only small proportions (Hf values. This problem is endemic to the Archean detrital zircon record and consistent with experimental results bearing on the relative retentivity of Hf vs. U and Pb in zircon. We argue that this behavior biases the Archean zircon record toward negative ε Hf values, which are at odds with the present TTG data set. If Hadean Jack Hills zircons are considered in light of these results, the mantle source of continents has remained unchanged for the last 4.3Gy.

Original languageEnglish
Pages (from-to)211-223
Number of pages13
JournalEarth and Planetary Science Letters
Volume337-338
DOIs
Publication statusPublished - Jul 1 2012

Fingerprint

hafnium isotopes
Hafnium
hafnium
Isotopes
continental crust
Archean
crusts
Earth mantle
zircon
Rocks
isotope
rocks
mantle
trondhjemite
rock
tonalite
continents
granodiorite
mantle source
Bearings (structural)

Keywords

  • Archean
  • Continental crust
  • Hf isotopes
  • Oceanic plateaus
  • Zircon

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Hafnium isotope evidence from Archean granitic rocks for deep-mantle origin of continental crust. / Guitreau, Martin; Blichert-Toft, Janne; Martin, Hervé; Mojzsis, S.; Albarède, Francis.

In: Earth and Planetary Science Letters, Vol. 337-338, 01.07.2012, p. 211-223.

Research output: Contribution to journalArticle

Guitreau, Martin ; Blichert-Toft, Janne ; Martin, Hervé ; Mojzsis, S. ; Albarède, Francis. / Hafnium isotope evidence from Archean granitic rocks for deep-mantle origin of continental crust. In: Earth and Planetary Science Letters. 2012 ; Vol. 337-338. pp. 211-223.
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