Deep-water channel deposits of contour current in the lower part of Middle Ordovician Kelimoli Formation of Shixiagu section in Zhuozishan area,western margin of Ordos Basin
Li Xiang-Dong1, Que Yi1, Huan Ya-Qi2
1 School of Land Resource Engineering,Kunming University of Science and Technology,Kunming 650093,China; 2 Jidong Oilfield Company of PetroChina,Hebei Tangshan 063200,China
Abstract The Lower Member of Middle Ordovician Kelimoli Formation in Zhuozishan area of western margin of Ordos Basin is characterised of dark gray thin- to medium-bedded limestones intercalated with very thin-bedded grayish black shales,while the limestones have slight lenticular shapes and little post-depositional effects,and the Shixiagu section is an ideal one for studying sedimentary processes with its obvious vertical variation. Based on the detail fieldwork,we further ascertained the deep-water slope depositional environments and contour current deposits from sedimentary structures and characteristics of sedimentary rocks. Furthermore,we discussed the hydrodynamics and depositional mechanisms according to their characteristics of fillings and shapes. The results show that: (1)Crystal fragments are punctate distribution with marl between them in calcisiltite and calcilutite as well as the inhomogeneous texture with alternating distribution of calcite coarse microcrystalline,fine microcrystalline and cryptocrystalline within the single bed. (2)Limestones are mainly developed grain-size(crystal grain of calcites)related sedimentary structures which include bigradational grading,banded structure and plane-uniform-plane succession. (3)Lenses are well developed in limestones which include continuous small-scale lenses in the thin bed layers,long lenses in the medium bed layers(usually less than 30cm)and lenticular shapes formed by multi limestone beds with symmetric pinch in single beds and the hole lens are pinching out in both shale and high topography.(4)Thinning-upward packages and their amalgamated beds are developed in the study section;Combining the previous research findings,we believe that the thin- to medium-bedded limestones in the Lower Member of Kelimoli Formation were deposited in deep-water environments with pervasive bottom currents which have the hydrodynamic characteristics of low velocity,weak-strong-weak periods and dimensional confine,and are supposed to be contour currents channel deposits. Their depositional mechanisms include three stages, i.e. clear water deposition of calcites before contour currents action,re-deposition during contour currents action and the turbid water deposition of mud.
Fund:Co-funded by the National Natural Science Foundation of China(Nos.41272119,41472096),the Science Foundation of Yunnan Provincial Department of Education(No.2015Z030),and the Natural Science Foundation of Kunming University of Science and Technology(No.KKSY201321008)
About author: Li Xiang-Dong,born in 1973, graduated from the Yangtze University with a Ph.D. degree,is a lecturer of the School of Land Resource Engineering of Kunming University of Science and Technology. He is currently engaged in research on sedimentology. E-mail: Lixiangdong614@163.com.
Cite this article:
Li Xiang-Dong,Que Yi,Huan Ya-Qi. Deep-water channel deposits of contour current in the lower part of Middle Ordovician Kelimoli Formation of Shixiagu section in Zhuozishan area,western margin of Ordos Basin[J]. JOPC, 2019, 21(2): 321-338.
Li Xiang-Dong,Que Yi,Huan Ya-Qi. Deep-water channel deposits of contour current in the lower part of Middle Ordovician Kelimoli Formation of Shixiagu section in Zhuozishan area,western margin of Ordos Basin[J]. JOPC, 2019, 21(2): 321-338.
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