<Abstract>Sm-Nd and Rb-Sr whole-rock isochron dating of the samples of cumulated gabbro,diabase and andesitic porphyrite from the A-rmantai ophiolite, Xinjiang, yielded the ages Of 561 ±41 Ma (Nd(t) = 6. 1 ...<Abstract>Sm-Nd and Rb-Sr whole-rock isochron dating of the samples of cumulated gabbro,diabase and andesitic porphyrite from the A-rmantai ophiolite, Xinjiang, yielded the ages Of 561 ±41 Ma (Nd(t) = 6. 1 ) and 392±17 Ma [ (87Sr/86Sr)i = 0. 7041], which stand for the ages of creation and later metamorphism of the ophiolites, respectively. The creation environment of the Armantai ophiolites seems to a back-arc basin caused by the southward subduction of the palaeo-Asia Ocean.展开更多
文摘<Abstract>Sm-Nd and Rb-Sr whole-rock isochron dating of the samples of cumulated gabbro,diabase and andesitic porphyrite from the A-rmantai ophiolite, Xinjiang, yielded the ages Of 561 ±41 Ma (Nd(t) = 6. 1 ) and 392±17 Ma [ (87Sr/86Sr)i = 0. 7041], which stand for the ages of creation and later metamorphism of the ophiolites, respectively. The creation environment of the Armantai ophiolites seems to a back-arc basin caused by the southward subduction of the palaeo-Asia Ocean.
