Sequence stratigraphic framework and palaeogeography evolution of the Cambrian in Lower Yangtze area
Lu Linlin1,2, Ji Youliang3
1 School of Energy,China University of Geosciences(Beijing),Beijing 100083 2 Research Institute of Petroleum Exploration and Development-Langfang Branch,PetroChina,Langfang 065007,Hebei 3 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249
Abstract：The Lower Yangtze area was a stable craton basin during Cambrian. It was uplifted in the Center Lower Yangtze area,and downwarped in both the south and the north areas. There were carbonate rock platform facies in the Center Lower Yangtze area,and mainly deep water clastic rock and carbonate rock deposition in the south and the north areas. Based on 12 outcrops observation including Nanjing,Chaohu, Hangzhou and other areas,2 second-order sequences and 14 third-order sequences were recognized,and the sequence stratigraphic framework of the Lower Yangtze area in Cambrian was established. Using second-order sequences system tract as time unit, lithofacies palaeogeography maps of the Cambrian were established.The sequence-palaeogeography evolution was controlled by 3 critical factors.The palaeogeographic framework was relatively stable,and open platform facies, restricted platform facies,platform edge slope facies,basin facies, etc., were successively developed in the Cambrian.
Lu Linlin,Ji Youliang. Sequence stratigraphic framework and palaeogeography evolution of the Cambrian in Lower Yangtze area[J]. JOPC, 2013, 15(6): 765-776.
