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

A global U-Pb and ...O zircon database shows temporal changes in the magmatic record related to changes in the degree of crustal reworking. The ...O composition of bulk sediment remains relatively constant through geologic time, with a mean value of 14.9... In contrast, the ...O values in magmatic z...

Full description

Saved in:
Bibliographic Details
Published in:Geology (Boulder) 2014-05, Vol.42 (5), p.451-454
Main Authors: Spencer, C. J., Cawood, P. A., Hawkesworth, C. J., Raub, T. D., Prave, A. R., Roberts, N. M. W.
Format: Article
Language:English
Subjects:
Geological time
Geomorphology
Magma
Minerals
Plate tectonics
Sedimentary geology
Seismology
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A global U-Pb and ...O zircon database shows temporal changes in the magmatic record related to changes in the degree of crustal reworking. The ...O composition of bulk sediment remains relatively constant through geologic time, with a mean value of 14.9... In contrast, the ...O 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 ...O values recorded by magmatic zircons to a significant increase in the incorporation of high ...O sediment in response to enhanced crustal thickening and reworking associated with the onset of collisional tectonics, especially during formation of supercontinents. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0091-7613
1943-2682
DOI:10.1130/G35363.1