Episodic mantle differentiation - Nd and Sr isotopic evidence

Details Episodic mantle differentiation - Nd and Sr isotopic evidence Episodic mantle differentiation - Nd and Sr isotopic evidence

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..47..263s&link_type=abstract

Earth and Planetary Science Letters, vol. 47, no. 2, Apr. 1980, p. 263-271.

Computer Science

20

Earth Mantle, Neodymium Isotopes, Petrology, Planetary Evolution, Strontium Isotopes, Abundance, Peridotite, Pyroxenes, Rare Earth Elements, Spinel

Scientific paper

A study of Nd and Sr isotopic composition of clinopyroxenes separated from two hydrous and four anhydrous ultramafic nodules is presented. Correlation of Nd-143/Nd-144 with Sm/Nd suggests that a second partial melting occurred about 560 m.y. ago resulting in LREE enrichment of a part of the anhydrous mantle. The isotopic data for anhydrous nodules show that oceanic type mantle underlies at some continental areas. It is concluded that the separation of subcontinental mantle regions from an initially chondritic reservoir may occur in discrete episodes, and that different histories of depletion and/or enrichment will produce isotopically distinct mantle reservoirs.

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