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《Acta Sedimentologica Sinica》 2018-03
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Research on Relationship between Characteristics of Deep-water Deposits and Palaeoenvironment in the Ordovician,Pingliang Formation,Southern Margin of the Ordos Basin: A case of Zhaolaoyu countryside,Fuping town,Shaanxi province

LI Hua;HE YouBin;HUANG Wei;LIU ZhuRuiZhi;ZHANG Jin;School of Geosciences,Yangtze University;Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education,Yangtze University;Research Center of Sedimentary Basin,Yangtze University;  
Deep-water deposits and relationship between palaeogeography is one key point and weak spot of sedimentology. Deep-water deposits well develop in Ordovician of Pingliang Formation in the southern margin of the Ordos Basin. The lithology is mainly micrite,muddy micrite,mudstone and chert in local. Current ripple,small scale of cross bedding,and bioturbation structure are very formed. Three typical lithofacies are interbedded micrite,chert,mudstone and tuff,bioturbated micrite,and massive bedded calcirudyte,corresponding to slope autochthonous deposits,contourites,and debrites,whose geochemical characteristics including δ~(13) C-δ~(18) O,Th-U,Ga-Cu,B-Cr,B-Ga,B-Sr,Ni/Co-U/Th,B/Ga-U/Th and ~(87) Sr/~(86) Sr-Sr/Ba show various. Slope autochthonous deposits and debrites are upwarding decreasing,and the contourites are reverse. The relative sea-level is rising,paleosalinity indicates multi-high to low change cyclicities,paleoclimate changes more and more arid,and reducing action is enhanced during the Pingliang stage. The relative sea-level is rising,paleosalinity change obviously,humid climate,and strong reducing action are helpful to contourites. By contrast,low relative sea-level,arid climate and tectonic movement contribute to debrites.
【Fund】: 国家自然科学基金项目(41472096 41502101);; 湖北省创新群体基金(2015CFA024);; 长江青年基金(2015cqn26)~~
【CateGory Index】: P534.42;P618.13
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