4.2 Ga zircon xenocryst in an Acasta gneiss from northwestern Canada: Evidence for early continental crust

Tsuyoshi Iizuka, Kenji Horie, Tsuyoshi Komiya, Shigenori Maruyama, Takafumi Hirata, Hiroshi Hidaka, Brian F. Windley

Research output: Contribution to journalArticle

134 Citations (Scopus)

Abstract

Evidence for the existence of continental crust older than 4.06 Ga has so far been obtained only from zircons in the Yilgarn Craton of Western Australia. In this paper we report the first occurrence of a very old zircon with a U-Pb age of 4.2 Ga in the Acasta Gneiss Complex of northwestern Canada, based on a laser ablation-inductively coupled plasma-mass spectrometry and sensitive high-resolution ion microprobe study. The U-Pb data reveal that the 4.2 Ga zircon occurs as a xenocryst in a 3.9 Ga granitic rock. Trace element compositions of the xenocryst suggest that it crystallized from a granitic magma. Our results, suggesting the existence of granitic rocks outside the Yilgarn Craton at 4.2 Ga, imply that granitic continental crust was more widespread than previously thought, and that it was reworked into Early Archean continental crust.

Original languageEnglish
Pages (from-to)245-248
Number of pages4
JournalGeology
Volume34
Issue number4
DOIs
Publication statusPublished - Apr 2006
Externally publishedYes

Fingerprint

gneiss
continental crust
zircon
craton
ion microprobe
ablation
rock
Archean
mass spectrometry
laser
magma
trace element
plasma

Keywords

  • Acasta gneiss complex
  • Ancient zircon
  • Crustal reworking
  • Hadean
  • Laser ablation-inductively coupled plasma-mass spectrometry
  • Sensitive high-resolution ion microprobe
  • U-Pb dating

ASJC Scopus subject areas

  • Geology

Cite this

Iizuka, T., Horie, K., Komiya, T., Maruyama, S., Hirata, T., Hidaka, H., & Windley, B. F. (2006). 4.2 Ga zircon xenocryst in an Acasta gneiss from northwestern Canada: Evidence for early continental crust. Geology, 34(4), 245-248. https://doi.org/10.1130/G22124.1

4.2 Ga zircon xenocryst in an Acasta gneiss from northwestern Canada : Evidence for early continental crust. / Iizuka, Tsuyoshi; Horie, Kenji; Komiya, Tsuyoshi; Maruyama, Shigenori; Hirata, Takafumi; Hidaka, Hiroshi; Windley, Brian F.

In: Geology, Vol. 34, No. 4, 04.2006, p. 245-248.

Research output: Contribution to journalArticle

Iizuka, T, Horie, K, Komiya, T, Maruyama, S, Hirata, T, Hidaka, H & Windley, BF 2006, '4.2 Ga zircon xenocryst in an Acasta gneiss from northwestern Canada: Evidence for early continental crust', Geology, vol. 34, no. 4, pp. 245-248. https://doi.org/10.1130/G22124.1
Iizuka, Tsuyoshi ; Horie, Kenji ; Komiya, Tsuyoshi ; Maruyama, Shigenori ; Hirata, Takafumi ; Hidaka, Hiroshi ; Windley, Brian F. / 4.2 Ga zircon xenocryst in an Acasta gneiss from northwestern Canada : Evidence for early continental crust. In: Geology. 2006 ; Vol. 34, No. 4. pp. 245-248.
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