Other
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50....1k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 50, Issue 1, pp.1-10
Other
6
Scientific paper
Nd and Pb isotopic ratios have been measured on the same samples from the Archaean layered Millindinna Complex in the western Pilbara Block of Western Australia. The Sm-Nd whole rock/mineral age is 2830 ± 20 Ma (2 ) and the initial 143 Nd / 144 Nd ratio is 0.50892 ± 0.00002 ( Nd -0.7 ± 0.4). The dispersion in lead isotopic ratios is limited and the resulting Pb-Pb whole rock age is 2960 ± 20 Ma (2 ) with a calculated Mi of 8.3. Variations in calculated and initial 208 Pb / 206 Pb ratios preclude a single source for this complex. Comparison with other Nd-Pb investigations of mafic/ultramafic complexes, particularly those in the time span from 2600-2900 Ma, reveals a trend from positive Nd and low (7.7-7.9) values in Ontario (Munro Township, Alexo, Newton) to negative Nd and higher values in the Suomussalmi, Millindinna and Stillwater Complexes. Although this trend could be the result of either mantle heterogeneity and/or crustal contamination, at the present time we favour crustal contamination.
Gulson Brian L.
Korsch Michael J.
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