重庆石柱地区下奥陶统沉积微相研究
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摘要
重庆石柱漆辽乡下奥陶统可划分为13种沉积微相和5种沉积亚相。结合露头沉积学研究得出该时段沉积环境的演化序列为:南津关组和分乡组下部以灰岩为主,夹陆源碎屑透镜体和鲕粒灰岩,属于局限台地亚相;分乡组的中上部以鲕粒滩和泥页岩为主,属于典型的开阔台地亚相;红花园组的底部以生物碎屑灰岩与泥岩互层为主,红花园的中上部为深灰色巨厚层含燧石结核灰岩、砾屑灰岩夹生物碎屑灰岩,分别属于台地边缘浅滩亚相和台地前缘斜坡亚相;大湾组的生物碎屑灰岩与页岩互层属于内陆棚亚相。综合分析表明研究区下奥陶统是一个水体向上变深的沉积旋回。
Thirteen sedimentary microfacies and five sedimentary subfacies have been distinguished for the Lower Ordovician strata in Qiliao,Shizhu,Chongqing.The restricted platform subfacies are recognized in the Lower Ordovician Nanjinguan Formation and the lower part of the Fenxiang Formation,where there occur limestone intercalated with terrigenous clastic lenses and oolitic limestone.The open platform subfacies are arranged into the middle and upper parts of the Fenxiang Formation,in which ooiltic shoal and argillutite are accentuated.The basal part of the Honghuayuan Formation dominated by alternating bioclastic limestone and mudstone is assigned to the platform-margin beach subfacies,whereas the foreslope subfacies occur in the middle and upper parts of the Honghuayuan Formation occupied by thick-bedded dark grey cherty nodular limestone and calcirudite intercalated with bioclastic limestone.The Dawan Formation built up of alternating bioclastic limestone and shale belongs to the inner shelf subfacies.Multidisciplinary analysis indicates that the Lower Ordovician strata in the study area are considered as the deepening-upward depositional cycles from the Lower Ordovician Nanjinguan Formation to the Dawan Formation.
Thirteen sedimentary microfacies and five sedimentary subfacies have been distinguished for the Lower Ordovician strata in Qiliao,Shizhu,Chongqing.The restricted platform subfacies are recognized in the Lower Ordovician Nanjinguan Formation and the lower part of the Fenxiang Formation,where there occur limestone intercalated with terrigenous clastic lenses and oolitic limestone.The open platform subfacies are arranged into the middle and upper parts of the Fenxiang Formation,in which ooiltic shoal and argillutite are accentuated.The basal part of the Honghuayuan Formation dominated by alternating bioclastic limestone and mudstone is assigned to the platform-margin beach subfacies,whereas the foreslope subfacies occur in the middle and upper parts of the Honghuayuan Formation occupied by thick-bedded dark grey cherty nodular limestone and calcirudite intercalated with bioclastic limestone.The Dawan Formation built up of alternating bioclastic limestone and shale belongs to the inner shelf subfacies.Multidisciplinary analysis indicates that the Lower Ordovician strata in the study area are considered as the deepening-upward depositional cycles from the Lower Ordovician Nanjinguan Formation to the Dawan Formation.
引文
[1]Fl櫣gel著,曾允孚译.石灰岩微相[M].北京:地质出版社,1989.
[2]Wilson J L著,冯增昭等译.地质历史中的碳酸盐岩相[M].北京:地质出版社,1981.
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[4]包洪平,杨承运.碳酸盐岩微相分析及其在岩相古地理研究中的意义[J].岩相古地理,1999,19(6):59-64.
[5]盛贤才,王韶华,文可东,等.鄂西渝东地区石柱古隆起构造沉积演化[J].海相油气地质,2004,9(1-2):43-52.
[6]冯增昭,彭勇民,金振奎,等.中国南方寒武纪-奥陶纪岩相古地理[M].北京:地质出版社,2001.
[7]余素玉.化石碳酸盐岩微相[M].北京:地质出版社,1989.
[8]James,N.P.The cool-water carbonate depositional realm[J].In:James,N.P.&Clarke,J.A.D.(eds)Cool Water Car-bonates,Society for Sedimentary Geology,Special Publication,1997,56,1-20.
[9]Erik Fl櫣gel著,马永生等译.碳酸盐岩微相-分析、解释及应用[M].北京:地质出版社,2006.628-640.
[2]Wilson J L著,冯增昭等译.地质历史中的碳酸盐岩相[M].北京:地质出版社,1981.
[3]Maliva R G&Dickson J AD.Microfacies and diagenetic controls ofporosity in Cretaceous/Tertiary chalks,Eldfisk Field,NorwegianNorth Sea[J].AAPG Bulletin,1992,76(11):1825-1838.
[4]包洪平,杨承运.碳酸盐岩微相分析及其在岩相古地理研究中的意义[J].岩相古地理,1999,19(6):59-64.
[5]盛贤才,王韶华,文可东,等.鄂西渝东地区石柱古隆起构造沉积演化[J].海相油气地质,2004,9(1-2):43-52.
[6]冯增昭,彭勇民,金振奎,等.中国南方寒武纪-奥陶纪岩相古地理[M].北京:地质出版社,2001.
[7]余素玉.化石碳酸盐岩微相[M].北京:地质出版社,1989.
[8]James,N.P.The cool-water carbonate depositional realm[J].In:James,N.P.&Clarke,J.A.D.(eds)Cool Water Car-bonates,Society for Sedimentary Geology,Special Publication,1997,56,1-20.
[9]Erik Fl櫣gel著,马永生等译.碳酸盐岩微相-分析、解释及应用[M].北京:地质出版社,2006.628-640.
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