Abstract：During deposition of the Middle Ordovician Majiagou Formation,a series of paleo-uplift was discovered around the Ordos restricted sea. It remains relatively poorly studied as to how Lüliang paleo-uplift controlled deposition of the Majiagou Formation,which restricted understanding of sedimentary environments of the Majiagou Formation in the northeastern part of the basin. Through detailed measurement and sampling analysis of the Fugu outcrop in Shaanxi Province,combined with the drilling and core data,stratigraphic thickness,lithofacies and microfacies of the Majiagou Formation were studied. Lastly,controls of the Lüliang paleo-uplift on deposition of the Majiagou Formation are discussed. The research results show that: (1)the Lüliang paleo-uplift intermittently blocked the seawater circulation between the Ordos restricted sea and the North China sea. (2)The paleo-uplift was located underwater during the high sea level period,and the barrier to seawater circulation was weak;the stratal thickness in the west of the paleo-uplift has little variation;the underwater paleo-uplift formed a limestone flat,and limestone flat and limestone/dolomite flat formed in the west of the Lüliang paleo-uplift. (3)During the low sea-level period,the paleo-uplift was intermittently subaerially exposed,and obviously blocked circulation of seawater between the Ordos restricted sea and North China sea;the stratal thickness decreases in the east of the paleo-uplift,and sedimentary facies changes from muddy dolomite in the paleo-uplift to limestone in the east of the paleo-uplift. The stratal thickness increases significantly to the west of the paleo-uplift,forming argillaceous dolomite flat,gypsum dolomite flat,and gypsum and saline lacustrine facies. The study provides petrological and paleo-environmental evidence for the Majiagou Formation in the eastern part of the basin.
DING Xiaoqi,TIAN Yinyu,LEI Tao et al. Control of Lüliang paleo-uplift on deposition of the Ordovician Majiagou Formation in Ordos Basin: evidence from Fugu outcrop in Shaanxi[J]. JOPC, 2024, 26(3): 671-682.
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