of Archean clastic metasedimentary rocks: a petrogenetic indicator for Archean gneisses?

Details of Archean clastic metasedimentary rocks: a petrogenetic indicator for Archean gneisses? of Archean clastic metasedimentary rocks: a petrogenetic indicator for Archean gneisses?

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41.1303l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 41, Issue 9, pp.1303-1312

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Scientific paper

The oxygen isotopic compositions of over 100 Archean clastic metasedimentary, felsic metavolcanic and gneissic rocks from selected areas within the Superior Province have been determined. 18 O values of low grade, immature clastic metasediments range from 8.0 to 13.3%. and hence are somewhat depleted in 18 O relative to other clastic metasediments. The lower 18 O content is attributed to the large proportion of unaltered rock fragments in the Archean metasediments. Felsic metavolcanics have a similar range of 18 O values (7.3 to 13.0%.. 18 O values for the middle amphibolite facies Pakwash paragneiss (8.8-11.7%.) are higher than those determined for the amphibolite to granulite facies Twilight paragneiss (7.3-9.2%.). Archean orthogneisses such as the Clay Lake gneiss (7.0-9.0%.), the Cedar Lake gneiss (7.4-8.7%.) and the Footprint gneiss (5.9-8.8%.) have 18 O values similar to those of the Twilight paragneiss. Therefore, at least at metamorphic grades higher than middle amphibolite facies, Archean metasedimentary gneisses may have 18 O values that are indistinguishable from those of Archean orthogneisses, and hence are no longer isotopically recognizable as metasedimentary rocks.

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