Sm-Nd dating of Archaean basic and ultrabasic volcanics

Details Sm-Nd dating of Archaean basic and ultrabasic volcanics Sm-Nd dating of Archaean basic and ultrabasic volcanics

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..36..263h&link_type=abstract

Earth and Planetary Science Letters, Volume 36, Issue 2, p. 263-268.

Mathematics

Logic

16

Scientific paper

Sm-Nd data for ten greenstone belt volcanics from Rhodesia define an age of 2.64 +/- 0.14 AE, which is in agreement with other geochronological data and with observed field relationships. This age and the initial 143Nd/144Nd ratio of 0.50919 +/- 0.00018 yield a time-integrated Sm/Nd ratio of 0.302 +/- 0.009 in the mantle source region, similar to that in chondrites. Sm/Nd ratios of some lavas are >0.31 and imply that a small fraction of their source was removed prior to or as part of the main melting event. The utility of the sm-Nd system for dating altered Archaean volcanic rocks is amply demonstrated by these data.

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