安徽绩溪新元古代海底扇沉积环境分析
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摘要
研究区位于安徽绩溪县杨溪镇,区内主要发育一套新元古代浅变质碎屑岩系,厚度为639.7m。碎屑岩以泥岩、泥质粉砂岩、砂岩、含砾砂岩和砾岩为主,发育水平层理,粒序层理,韵律层理等沉积构造,可见鲍马层序Ta、Tc、Td、Te段。碎屑组分以跃移组分为主,含量为35%~58%。地层上段厚为254.8m,包含粉砂岩、泥质粉砂岩和粉砂质泥岩,水平层理和粒序层理发育,为中扇一外扇扇叶沉积;中段厚为192.5m,主要为细砂岩、粉砂岩和泥质粉砂岩,砂岩条带广泛发育,属于中扇水道沉积;下段厚为192.4m,为一套砾岩层,砾石分选较差,砾岩层间夹有粉砂质泥岩,为上扇水道滞留沉积。总体上,形成一套退积的海底扇沉积序列。
The study area located in Yangxi town of Jixi,Anhui Province,is mainly a set of elastic sedimentary rock of Neoproterozoic,which has a thickness of 639.7m.The strata are mainly comprised of mudstone,argillaceous siltstone,sandstone,pebbly sandstone and conglomerate.Sedimentary structures contain horizontal bedding,graded bedding,bedding and rhythmic bedding.Tb,Tc and Td of Bouma sequences can be recognized.Probability cumulative grainsize curves have a high content of saltation population,ranging from 35%~58%.The upper segment of the profile,254.8m in thickness,consisting of fine argillaceous siltstone,mudstone,silty mudstone,developing horizontal bedding and graded bedding,is deposited in the lobe of outer fan.The middle segment of the profile,192.5m in thickness,is composed of siltstone,fine sandstone,argillaceous sihstone.Sandstone ribbon is widely distributed in the middle segment,which is considered to be deposited in channel of middle fan.The lower segment with 192.4m thickness is a set of conglomerates interbedded with silty mudstone,and the conglomerates have a poor sorting,which was regarded to be deposited in channel of upper fan.As a whole,a set of submarine fan sedimentary sequence formed during the retrogradation.
The study area located in Yangxi town of Jixi,Anhui Province,is mainly a set of elastic sedimentary rock of Neoproterozoic,which has a thickness of 639.7m.The strata are mainly comprised of mudstone,argillaceous siltstone,sandstone,pebbly sandstone and conglomerate.Sedimentary structures contain horizontal bedding,graded bedding,bedding and rhythmic bedding.Tb,Tc and Td of Bouma sequences can be recognized.Probability cumulative grainsize curves have a high content of saltation population,ranging from 35%~58%.The upper segment of the profile,254.8m in thickness,consisting of fine argillaceous siltstone,mudstone,silty mudstone,developing horizontal bedding and graded bedding,is deposited in the lobe of outer fan.The middle segment of the profile,192.5m in thickness,is composed of siltstone,fine sandstone,argillaceous sihstone.Sandstone ribbon is widely distributed in the middle segment,which is considered to be deposited in channel of middle fan.The lower segment with 192.4m thickness is a set of conglomerates interbedded with silty mudstone,and the conglomerates have a poor sorting,which was regarded to be deposited in channel of upper fan.As a whole,a set of submarine fan sedimentary sequence formed during the retrogradation.
引文
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李双应,杨欣,程成等.2014.论皖南地区前寒武纪浅变质岩系地层层序.地层学杂志,38(1):77—94.Li Shuangying,Yang Xin,Cheng Cheng et al.2014.On the stratigraphic sequences of Precambrian weak metaraorphic rock series in South Anhui,China.Journal of Stratigraphy,38(1):77—94.
马荣生,余心起,程光华.1999.皖南洽舍一寨西剖面前震旦纪岩石地层宏观特征.安徽地质,9(1):1—13.Ma Rongsheng,Yu Xinqi and Cheng Guanghua.1999.The macrofeaturos of the Presinian lithostrata of the Qiashe-Zhaixi profile in South Anhui.Geology of Anhui,9(1):1—13.
马荣生.2002.皖南前南华纪岩石地层.资源调查与环境,23(2):94—107.Ma Rongsheng.2002.The stratigraphy of pre-Nanhua System in South Anhui.Resources Survey&Environment,23(2):94—107.
徐备.1990.论赣东北—皖南晚元古代沟弧盆体系.地质学报,64(1):33—42.Xu Bei.1990.The Late Proterozoic trench-basin-arc system in NE Jiangxi-southern Anhui Province.Acta Geologica Sinica,64(1):33—42.
Alpak O F,Barton D M and Naruk J S.2013.The impact of fine-scale turbidite channel architecture on deep-water reservoir performance.AAPG Bulletin,97(2):251—284.
Gardner M H,Borer J M,Melick J J et al.2003.Stratigraphic proeess-rospcnse model for submarine channels and related features from studies of Permian Brushy Canyon outcrops,West Texas.Marine and Petroleum Geology,20(6—8):757—787.
Hume T M,Sherwood A M and Nelson C S.1975.Alluvial sedimentology of the Upper Pleistocene Hinuera Formation,Hamilton Basin,New Zealand.Journal of the Royal Society of New Zealand,5(4):421—462.
Kneller B.2003.The influence of flow parameters on turbidite slope channel architecture.Marine and Petroleum Geology,20(6—8):909—910.
Mutti E and Ricci L F.1975.Turbidite facies and facies associations.In:Examples of Turbidite facies and Facies Associations from Selected Formations of the Northern Apennines.Field Trip Guidebook,A-11.Int.Sediment.Congr.,Ⅸ,Nice.21-36.
Mutti E.1977.Distinctive thin-bedded turbidite facies and related depositional environments in the Eocenen Hecho Group(South-Central Pyrenees,Spain).Sedimentology,24(1):107-131.
Mutti E,Tinterri R,Benevelli G et al.2003.Deltaic,mixed and turbidite sedimentation of ancient foreland basins.Marine and Petroleum Geology,20(6-8):733-755.
Shanmugam G and Moiola R J.1988.Submarine fans:Characteristics,models,classification,and reservoir potential.EarthScience Reviews,24(6):383-482.
Stow D and Lovell J.1979.Contourites:Their recognition in modern and ancient sediments.Earth-Science Reviews,14(3):251-291.
Stow D A V,Faugeres J C,Viana A et al.1998.Fossil contourites:Acritical review.Sedimentary Geology,115(1-4):3-31.
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