HFSE/REE fractionations recorded in three komatiite-basalt sequences, Archean Abitibi greenstone belt - Implications for multiple plume sources and depths

Details HFSE/REE fractionations recorded in three komatiite-basalt sequences, Archean Abitibi greenstone belt - Implications for multiple plume sources and depths HFSE/REE fractionations recorded in three komatiite-basalt sequences, Archean Abitibi greenstone belt - Implications for multiple plume sources and depths

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.4111x&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 57, no. 16, p. 4111-4118.

Computer Science

12

Basalt, Chemical Fractionation, Earth Mantle, Plumes, Rare Earth Elements, Volcanoes, Geochemistry, Magnesium Compounds

Scientific paper

Komatiite-tholeiite sequences in the Archean Abitibi greenstone belt show systematic differences of REE patterns and high field strength element (HFSE)/REE fractionations between volcanic centers. Type 1 komatiites are Al undepleted, and have flat REE patterns, with mantle-normalized Nb, Zr, Hf/REE of about 1. Type 2 komatiites are relatively MgO-rich, Al-undepleted, with LREE depletion and positive normalized Nb, Zr, Hf/REE fractionations. Type 3 komatiites are Al-depleted, Fe-rich, HREE-depleted, and feature negative-normalized Hf, Zr/REE fractionations. The three types of komatiites may have formed in plumes originating at progressively greater depths. Magnesium tholeiites associated with type 1 and 3 komatiites are likely the fractionation products of komatiites at low and high pressures, respectively, whereas type 2 Mg tholeiites originated in an undepleted source relative to the coexisting komatiites with 'perovskite signature'. Early greenstone belt evolution was characterized by numerous oceanic plateaus developed from multiple plumes originating at different depths from heterogeneous mantle; the plateaus may have been preferentially obducted.

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