Determination of initial 87 Sr / 86 Sr and 143 Nd / 144 Nd in primary minerals from mafic and ultramafic rocks: Experimental procedure and implications for the isotopic characteristics of the Archean mantle under the Abitibi greenstone belt, Canada

Details Determination of initial 87 Sr / 86 Sr and 143 Nd / 144 Nd in primary minerals from mafic and ultramafic rocks: Experimental procedure and implications for the isotopic characteristics of the Archean mantle under the Abitibi greenstone belt, Canada Determination of initial 87 Sr / 86 Sr and 143 Nd / 144 Nd in primary minerals from mafic and ultramafic rocks: Experimental procedure and implications for the isotopic characteristics of the Archean mantle under the Abitibi greenstone belt, Canada

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.2335m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 50, Issue 10, pp.2335-2348

Computer Science

16

Scientific paper

In order to evaluate the isotopic characteristics of the Archean mantle we have analysed primary minerals from mafic and ultramafic rocks from the Abitibi greenstone belt (Canada). In the first part of this study, we show the effects of washing, leaching and partial dissolution on the mobility of K, Rb, Ba, Sr, Nd and Sm and on the Sr isotopic composition of Archean and modern clinopyroxenes. These experiments lead to the establishment of an analytical procedure allowing the measurement of primary 87 Sr / 86 Sr and 143 Nd / 144 Nd . Following this procedure, we analysed six clinopyroxenes and a plagioclase from five localities in the Abitibi belt The results show that the mantle source of these rocks was homogeneous and depleted in Rb / Sr and Nd / Sm over the entire belt, with average 87 Sr / 86 Sr = 0.70105 ± 0.00006 and Nd = 2.49 ± 0.27.

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