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Paleomagnetic result of the Cenozoic volcanic rocks from the Tuoyun Basin,southwest Tien Shan of China and its tectonic implications

WANG Yongcheng;HUANG Baochun;ZHU Rixiang LIU Tao Institute of Geology and Geophysics;Chinese Academy of Sciences. Beijing 100029;China

  Paleomagnetic study on the Cenozoic volcanic rocks from the Tuoyun Basin of the southwest Tien Shan indicates that most samples could isolate a stable characteristic remanent magnetization with reversed polarity.The positive fold test suggests that the characteristic component is very likely to be a primary magnetization acquired in the formation of rocks.Comparison with the reference Eurasia poles at 60 Ma indicates little or insignificant N-S convergence between the south edge of southwest Tien Shan and Siberia since the onset of the India/Asia collision at the Eocene. Furthermore,the Cretaceous and Tertiary paleomagnetic results suggest that the Tuoyun Basin was subjected to a local clockwise rotation of 20°-35°with respect to Eurasia since the Paleocene time,which is probably subsequent to the Cenozoic northward compression of the Pamir arc.……