Abstract
Sm-Nd isotopic study for the ore-bearing Jinchuan ultramafic rocks in Gansu province, China, reveals the age of 1508 ± 31 Ma, which is obtained by Sm-Nd internal isochron method. The Rb-Sr isotopic system of the Jinchuan rocks have been contaminated by crustal materials, but little influence of crustal materials disturbed their Sm-Nd isotopic system. The determined results for acid-washed pyroxenes show that the source region of the Jinchuan ultramafic rocks may possess the following features: relatively homogeneous negative eNd(T) values, relatively dispersed eSr(T) values (generally larger than +60), and exhibiting a horizontal distribution in Nd-Sr correlation diagram.
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