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Sm-Nd and Rb-Sr whole-rock isochron dating of the samples of cumulated gabbro,diabase and andesitic porphyrite from the Armantai ophiolite,Xinjiang,yielded the ages of 561±41(Ma(εNd(t)=6.1)and 392±17Ma(87Sr/86Sr)i=0.7041],which stand for the age