Tectonic palaeogeography evolution and sedimentary filling characteristics of the Ordovician in the Ordos area
Shao Dong-Bo1, Bao Hong-Ping1,2, Wei Liu-Bin1,2, Cai Zheng-Hong1,2, Wu Chun-Ying1,2, Zhou Li-Xia1,2, Cao Yan-Gang1
1 Changqing Oil Field Branch,PetroChina,Xi’an 710018,China; 2 National Engineering Laboratory for Exploration and Development of Low Permeability Oil & Gas Field,Xi’an 710018,China
Abstract The Ordos region was located in the southwestern margin of the North China Craton plate in the Ordovician. Due to the dehiscing-converging effects of the Qinling-Qilian-Helan three-armed rift system,obvious tectonic sedimentary differentiation between the Ordos area and the North China Craton had begun to occur in Ordovician. The prominent expression is the large-scale development of evaporite deposits in the eastern part of Ordos area during the Ordovician depositional period. Palaeotectonics analysis shows that the Ordos area was generally characterized by the palaeotectonics distribution pattern of “three uplifts-two depressions-one archicontinent” in the Ordovician. During the Ordovician,it experienced sevaral palaeogeography evolution processes, respectively the marginal transgression in the early Yeli-Liangjiashan period,the oscillating whole-subsidence transgression in the Majiagou period,and the southwestern marginal fast subsidence in the Pingliang-Beiguoshan period, which is characterized by a strong evolution. The sedimentary-filling effect of the Ordos area in the Ordovician has the following important features: Firstly,being controlled by the central palaeo-uplift,the east-west sedimentary differentiation is obvious; secondly,with the evolution of the times,the inner-source sedimentation is dominant in the early and mid-term,while the mixed source or terrigenous clastic deposition is dominant in the late stage; thirdly,the deposits in the southwestern margins are hugely thick,where the structural subsidence is the most active during the Ordovician.
Fund:Financially supported by the National Science and Technology Major Project of China(No.2016ZX05004-006)
About author: About the first author Shao Dong-Bo,born in 1966,senior engineer, graduated from Northwest University in 1989. Now he is mainly engaged in petroleum geological exploration and technical management. E-mail: sdb_cq@petroChina.com.cn.
Cite this article:
Shao Dong-Bo,Bao Hong-Ping,Wei Liu-Bin et al. Tectonic palaeogeography evolution and sedimentary filling characteristics of the Ordovician in the Ordos area[J]. JOPC, 2019, 21(4): 537-556.
Shao Dong-Bo,Bao Hong-Ping,Wei Liu-Bin et al. Tectonic palaeogeography evolution and sedimentary filling characteristics of the Ordovician in the Ordos area[J]. JOPC, 2019, 21(4): 537-556.
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