Origin of deep-water stripped-and-banded mudstones related to contour currents in the Ordovician, Zhuozishan area, western margin of Ordos Basin
Li Xiangdong1, Huan Yaqi2
1 School of Land Resource Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan; 2 Jidong Oilfield Company of PetroChina, Tangshan 063200,Hebei
Abstract：The research for the mechanism of stripped-and-banded sedimentary structures is usually restricted by its compound processes which include chemical precipitation and physical deposition. The stripped-and-banded mudstones in the Kelimoli and Wulalike Formations in the Zhuozishan area,which were formed by physical deposition,provide a good view of investigation for the sedimentary mechanism of currents. Based on detail observation of field and thin sections,the role of contour currents in the deposition of deep-water stripped-and-banded mudstones is deduced from recent advances in flume experiments of fine-grained sediments. The upper part of the Kelimoli Formation constitutes of stipped mudstones with continuous or discontinuous extremely-thin lenses and fine-coarse-fine vertical succession in grain size,while the Wulalike Formation constitutes of banded mudstones associated with calcirudites and has a narrow-wide-narrow succession vertically. The mechanism of stripped￣and￣banded mudstones is related to the accretion of clay flocculated ripples and the movements of bedloads which both induced by contour currents. The stripped sedimentary structures were formed by the isochronous deposition of bedloads and accretion of flocculated ripples(with long trails)in weak contour currents period,when the contour currents not only eroded,transited and redeposited,but also produce large clay flocculated ripples with long trails. And the banded sedimentary structures were formed by the continued aggradation of bedloads in strong contour currents period when the flocculated ripples were small. The differences between stripped mudstones in the Kelimoli Formation and banded mudstones in the Wulalike Formation perhaps are made by the depth of sea water;the stripped structures deposited in relatively deeper water than banded structures. The results show the greatest transgression of the Middle to Upper Ordovician is occurred in the upper part of Kelimoli Formation in the western Ordos Basin,which has an important significance for the tectonic transgression and environment in the study area.
Li Xiangdong,Huan Yaqi. Origin of deep-water stripped-and-banded mudstones related to contour currents in the Ordovician, Zhuozishan area, western margin of Ordos Basin[J]. JOPC, 2017, 19(6): 987-997.
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