湘南宁远一带中、上泥盆统碳酸盐岩复理石建造的发现
DISCOVERY OF CARBONATE FLYSCH FORMAT旧N OF THE MIDDLE—UPPER DEVONIAN IN NINGYUAN AREA OF SOUTHERN HUNAN
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摘要: 我们于1979年至1980年底,在湘南宁远、江永、江华、道县、兰山一带进行了野外调查工作,发现本区中、上泥盆统碳酸盐岩具有明显的复理石建造特征,值得提供大家参考。Abstract: 1.Characteristics of the carbonate flysch form ation a. It is characterized by conspicuous rhythms and every single rhythm is several centimetres or dozens of centimetres thick. It has a series of crinkled beddings of penecontemporaneous deformation formed by submarine slumping.b. Sedimentary structures other than bioherm are well bedded.c. Rudaceous limestones and bioherms are common.d.The formation is dark or dark gray but the light gray is seldom found.e. It is of marine lithofacies and its thickness is more than 1288.6-1600 m。2.Changes of sedimentary environment Two lithofacies are differentiated。One is turbidite fades found in Dabatou area,Ningyuan;It is composed of thin layers of limestone and dark marl,chert beds or siliceous mudstone are also representative;fossils are scares.Floating organ-ism Tentaculites fossil can occasionally be found.Bouma sequence and cronkled beddings of slumping type develop well,the sedimentary environment is from bathy-al to deep sea.The other facies is found in the outer area of Dabatou. It consists of massive reef,colluvial deposit in front of the reef,bioclastic limestone and porous dolo mite etc.The benthonic organisms such as Stromatoporoids,Brachiopods,coral ect.1'he environment is mainly in shallow sea and subtidal belt.
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[1] 1.涂光炽、章振根、林学农、1978,海相沉积菱铁矿矿床及其找矿,科技文献出版社:29 - 40页。
2.李继亮、张昌明、高文学、练瑞君,黄家宽、田兴有、刘杰汉,1978,我国几个地区浊流岩的特征,地质科学,第一期。26-44页。
3.关尹文,1979,卷曲层理及其地质意义,地质与勘探,2期:36 - 40页。
4.王正英,1981,海相深水碳酸盐岩及沉积模式,沉积专辑,成都地质学院沉积岩教研室编.407-.423页。
5.曾允孚, 1981,碳酸盐沉积相,沉积专辑,成都地质学院沉积岩教研室编。370— 106页。
6.Earle, F.Mcbride and Robert, L.Folk, 1979, Features and origin of Italian Jurassic radiolarites deposited on continental crust, Jour. of Sedimentary petrology, Vo1.49 No.3 p. 837-868 -

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