湖南石门杨家坪灯影期岩相和沉积环境  

LITHOFACIES AND SEDIMENTARY ENVIRONMENTS OF LATE SINIAN DENGYING FORMATION AT YANGJIAPING IN SHIMEN,HUNAN

作　　者：朱忠德[1] 胡明毅[1] 罗柳忻 肖传桃[1] 李相明[1] 郭成贤[1] 胡爱梅 

机构地区：[1]江汉石油学院地质系,湖北江陵434102

出　　处：《石油与天然气地质》1993年第4期261-271,共11页Oil & Gas Geology

摘　　要：中扬子台地西南缘杨家坪灯影组,可划分为流水成因颗粒岩(G_1—G_7)、流水生物化学成因藻白云岩(A_1—A_2)、生物化学成因叠层石粘结岩(S_1—S_4)、复成因泥晶白云岩及泥岩(M_1—M_5)、与重力成因有关的滑积岩(B_1—B_2)、重力流成因的浊积岩等6大类21种岩相。形成潮上-潮间坪上部组合、潮间坪下部组合、潮下组合、滩礁组合、台地前缘斜坡组合、盆地边缘组合。从下向上有规律地形成了三个岩相序列:台地岩相序列属潮坪沉积环境;台地边缘岩相序列属上、下斜坡和浅海陆棚岩相序列。构成一个海侵推进层序。A series of dolomites developed in the Dengying Formation at Yangjiaping on the southwest margin of middle Yangzi Platform.The dolomites can be classified into sixgroups:water current genetic grainstone (G_1-G_7);water current biochemical genetic algaldolostone (A_1-A_2);biochemical genetic stromatolithic boundstone (S_1-S_4);polygeneticmicritic dolostone and mud rock (M_1-M_5);slump rock (B_1-B_2) related to gravity genesisand turbidite of gravity flow genesis and six kinds of lithofacies associations:supratidal-upper part of intertidal flat;lower part of intertidal flat;subtidal;bank-reef;platformforeslope and basin-margin associations.They constitute three sequences from lower toupper:platform sequence formed in tidal flat environment;platform marginal sequenceformed on slope and basin-margin sequence,these lithofacies sequences constitute a com-plete transgression sequence.

关 键 词：岩相 白云岩 沉积环境 灯影组 

分 类 号：P588.245[天文地球—岩石学]