Other
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.360..333d&link_type=abstract
Nature (ISSN 0028-0836), vol. 360, no. 6402, p. 333-336.
Other
9
Basalt, Earth Mantle, Geochemistry, Abundance, Geochronology, Melting, Mongolia, Radioactive Age Determination
Scientific paper
Evidence from a suite of xenoliths from alkali basalts in the Inner Mongolia is presented which suggests that the lithosphere in this region has remained table and closed to chemical modification since experiencing partial melting in the Proterozoic. Clinopyroxene separates from these xenoliths yield an approximate isochron in the Nd-143/Nd-144 versus Sm-147/Nd-144 diagram, suggesting an episode of depletion about 1.6 Gyr ago. Although other explanations for the correlation, such as mixing, cannot be ruled out definitively, further evidence for the longer-term undisturbed nature of the lithosphere in this region comes from neodymium model ages of the clinopyroxenes. In particular, one highly depleted sample with very high Sm-147/Nd-144 provides a model age of 1.6 Gyr, consistent with the isochron result.
Deng Fang-Lin
Macdougall Douglas J.
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