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    A strontium isotope and trace element profile through the Partridge River Troctolite, Duluth complex, Minnesota

    Initial 87Sr/86Sr ratios down a 2,315 foot-long core (DDH-295) through the Partridge River Troctolite are lower in the depth range 710–1,410 feet (0.70443±22) than in the underlying and overlying rocks (0.70500±1...

    Norman K. Grant, Philip A. Molling in Contributions to Mineralogy and Petrology (1981)