摘要
南天山和静县大山口剖面石炭系野云沟组发育齐全,出露完好,主要由碳酸盐岩及少量碎屑岩组成,总厚度为696.8 m。岩石类型以碳酸盐岩为主,主要包括砾屑灰岩、含陆源碎屑鲕粒灰岩、生物碎屑微晶灰岩、含陆源碎屑砂屑灰岩、微晶灰岩及泥晶灰岩等。野云沟组主要为斜坡相和盆地相沉积,少量为碳酸盐台地相沉积。斜坡相主要发育砾屑灰岩、薄层微晶灰岩及泥晶砂屑灰岩,盆地相以微晶灰岩和泥晶灰岩为主,开阔台地相主要发育生物碎屑灰岩、鲕粒灰岩和微晶灰岩。砾屑灰岩主要分布于野云沟组下部及顶部碳酸盐斜坡沉积环境,是一个以碳酸盐碎屑流沉积为特征的坡度较陡的斜坡。野云沟组由数个碳酸盐开阔台地—斜坡—盆地构成的旋回沉积组成。
The strata of Yeyungou Formation in Dashankou section is well exposed,mainly composed of carbonate rocks and a little clastic rocks,with a thickness of 696. 8 m. The rock types of this section are mainly limestone which may be divided into calcirudite, oolitic limestone with continental clast, bioclastic limestone, calcarenite with continental clast, microcrystalline limestone and micrite. Yeyungou Formation mainly developed carbonate slope facies, deep water basin facies and a little carbonate open platform facies. The carbonate slope facies mainly consists of calcirudite, thin-bedded microcrystalline limestone and micritic calcarenite,the basin facies is mainy microcrystalline limestone and micrite and the open platform is mostly composed of bioclastic limestone,oolite and microcrystalline limestone. Calcirudite developed in the lower part and the top of Yeyungou Formation,formed in carbonate steep slope environment which is characterized by carbonate debris flow. Yeyungou Formation is mainly composed of several cycles of carbonate open platform, slope and basin sedimentation.
出处
《地质科学》
CAS
CSCD
北大核心
2011年第2期404-414,共11页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家自然科学基金项目(编号:40972082)
中石化海相前瞻性研究项目"塔里木区块周缘造山带石炭纪一新近纪构造岩相古地理研究
编图"(编号:432263)资助
关键词
碳酸盐岩
沉积相
野云沟组
石炭系
南天山
Carbonate rocks, Sedimentary facies,Yeyungou Formation, Carboniferous, south Tianshan
