Oxygen isotopes in detrital zircons: Insight into crustal recycling during the evolution of the Greenland Shield

C. L. Kirkland, M. J. Whitehouse, V. Pease, Martin Van Kranendonk

Research output: Contribution to journalArticle

Abstract

Insight into the interactions between crust and hydrosphere, through the protracted evolution of the Greenland Shield, can be provided by oxygen isotopes in the mineral remnants of its denuded crust. Detrital zircons with ages of 3900 Ma to 900 Ma found within an arkosic sandstone dike of the Neoproterozoic (?Marinoan) Mørænesø Formation, North Greenland, provide a time-integrated record of the evolution of part of the Greenland Shield. These zircon grains are derived from a wide variety of sources in northeastern Laurentia, including Paleoproterozoic and older detritus from the Committee-Melville orogen, the Ellesmere-Inglefi eld mobile belt, and the subice continuation of the Victoria Fjord complex. Archean zircon crystals have a more restricted range of δ18OSMOW values (between 7.2% and 9.0% relative to standard mean ocean water [SMOW]) in comparison to Paleoproterozoic 1800-2100 Ma grains, which display signifi cant variation in δ18OSMOW (6.8%-10.4%). These data refl ect differences in crustal evolution between the Archean and Proterozoic Earth. Through time, remelting or reworking of high δ18O materials has become more important, consistent with the progressive emergence of buoyant, cratonized continental lithosphere. A secular increase in the rate of crustal recycling is implied across the Archean-Proterozoic boundary. This rate change may have been a response to differences in the composition of sediments and/or the stabilization of continental crust. One Eoarchean oscillatory-zoned zircon grain, free of cracks and with concordant U-Pb systematics, has an elevated δ18OSMOW value of 7.8%. This is interpreted to refl ect a primary magmatic signature, supporting the presence of heavy oxygen that may be compatible with a hydrosphere on early Earth, as previously determined only from Jack Hills zircons.

Original languageEnglish
Pages (from-to)3-12
Number of pages10
JournalLithosphere
Volume2
Issue number1
DOIs
Publication statusPublished - Feb 1 2010
Externally publishedYes

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crustal recycling
oxygen isotope
shield
zircon
Archean
hydrosphere
Proterozoic
crust
early Earth
crustal evolution
mobile belt
Laurentia
continental lithosphere
fjord
reworking
detritus
continental crust
dike
stabilization
crack

ASJC Scopus subject areas

  • Geology

Cite this

Oxygen isotopes in detrital zircons : Insight into crustal recycling during the evolution of the Greenland Shield. / Kirkland, C. L.; Whitehouse, M. J.; Pease, V.; Van Kranendonk, Martin.

In: Lithosphere, Vol. 2, No. 1, 01.02.2010, p. 3-12.

Research output: Contribution to journalArticle

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