Boninite series: low Ti-tholeiite associations from the 2.7 Ga Abitibi greenstone belt

Details Boninite series: low Ti-tholeiite associations from the 2.7 Ga Abitibi greenstone belt Boninite series: low Ti-tholeiite associations from the 2.7 Ga Abitibi greenstone belt

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998e%26psl.164..303k&link_type=abstract

Earth and Planetary Science Letters, Volume 164, Issue 1-2, p. 303-316.

Computer Science

23

Scientific paper

Boninite series volcanic flows, interfingered with komatiites and tholeiitic basalts, occur at several localities in the ~2.7 Ga Abitibi greenstone belt. Flows from Whitney Township, Ontario, have a compositional range of SiO2 44-60 wt%, MgO 24-7.4, Mg# 83-69, and Ni 930-200 ppm. Low TiO2 (0.14-0.31 wt%) but high Al2O3 (13-25 wt%) contents yield variably high Al2O3/TiO2 ratios of 48-100. These boninite series volcanics are characterized by fractionated HREE where Gd/Ybn 0.3-0.7 positive normalized Zr(Hf)/MREE anomalies, and Zr/Hf > 36; generally negative normalized Nb anomalies; and LREE depletion to enrichment (La/Smn 0.72-1.4). Flows with similar compositional affinities occur in the neighbouring Kidd Volcanic Complex and Tisdale volcanic group. Alteration, and/or contamination by continental crust can be ruled out as the cause of the distinctive and coherent compositions. If the areally extensive komatiite-tholeiite association represents an ocean plateau derived from a mantle plume and the boninite series formed in a convergent margin, then the interfingering of komatiite and boninite series flows may represent interaction of a plume with a subduction zone.

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