Re-discussion on natures of extension in Helanshan region before Cenozoic era
ZHANG Jin1, MA Zong-jin1, REN Wen-jun2
1. School of Earth and Space Sciences, Peking University, Beijing 100871, China; 2. Department of Geophysical Survey, Changqing Oil Field Company, Yinchuan 751104, China
ZHANG Jin, MA Zong-jin, REN Wen-jun. Re-discussion on natures of extension in Helanshan region before Cenozoic era[J]. Editorial office of ACTA PETROLEI SINICA, 2004, 25(6): 8-11,17.