Genesis mechanism analysis of convolute laminations of the Upper Ordovician Lashenzhong Formation in western margin of Ordos Basin
LI Xiangdong1,2, CHEN Hongda1, CHEN Haiyan3, WEI Zeyi1
1 School of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093,China; 2 Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources,Institute of Geology, Chinese Academy of Geological Sciences,Beijing 100037,China; 3 Hainan Branch of China National Offshore Oil Corporation China Limited,Haikou 570312,China
Abstract：Convolute lamination,which has very complicated genesis processes,is an important type of soft-sediment deformation structures. In deep-water deposition environments,there are very important significance both in understanding the formation mechanism of convolute laminations and improving the identification of internal-wave and internal-tide deposits by revealing the relationship between them. The convolute laminations were found in blocked turbidity current deposits of Upper Ordovician Lashenzhong Formation have been carried out in Zhuozishan area,Inner Mongolia,in the north of western Ordos Basin. It could be divided into two categories according to the morphology: vergent regular convolute laminations and cyclotron-like convolute laminations. The former type is characterized as tight anticlines,flat synclines and sand nuclear underlying anticline,which is frequently associated with bi-directional cross-beddings. The latter type,which is belonged to intra-stratal contortion,is often restricted to layers with truncation surface and is associated with sedimentary structures of combined-flow deposits and wave-ripple laminations. Based on the comprehensive research on sedimentary characteristics,convolute lamination features,associated sedimentary structures and other related research results,it can be inferred that the vergent regular convolute lamination is mainly induced by internal-tides and the density inversion occured during liquefaction. The deformation driven by Rayleigh-Taylor instability and subsequent modification due to continued horizontal shear imposed by flow. The cyclotron-like convolute lamination is mainly induced by short period internal waves which includes random internal-waves produced by reflected turbidity currents and internal solitary waves distorted from internal-tides. It is characterized as syn-depositional stratified liquefaction rather than density inversion. The deformation occurs induced by Kelvin-Helmholtz instability and further modification of horizontal shear imposed by flow.
LI Xiangdong,CHEN Hongda,CHEN Haiyan et al. Genesis mechanism analysis of convolute laminations of the Upper Ordovician Lashenzhong Formation in western margin of Ordos Basin[J]. JOPC, 2022, 24(6): 1130-1148.
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