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Proterozoic onset of crustal reworking and collisional tectonics: Reappraisal of the zircon oxygen isotope record

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Abstract

A global U-Pb and δO zircon database shows temporal changes in the magmatic record related to changes in the degree of crustal reworking. The δO composition of bulk sediment remains relatively constant through geologic time, with a mean value of 14.9%. In contrast, the δO values in magmatic zircons vary from relatively low values averaging ̃6% in the Archean to increasingly higher and scattered values defining a series of peaks and troughs in post-Archean data. The degree of crustal reworking increases at times of supercontinent assembly. Therefore we attribute the pattern of post-Archean δO values recorded by magmatic zircons to a significant increase in the incorporation of high δO sediment in response to enhanced crustal thickening and reworking associated with the onset of collisional tectonics, especially during formation of supercontinents.
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Original languageEnglish
Pages (from-to)451-454
Number of pages4
JournalGeology
Volume42
Issue number5
Early online date21 Mar 2014
DOIs
Publication statusPublished - May 2014

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