摘要
一、前言 准噶尔盆地陆相侏罗系发育较好,分布广泛,尤其在盆地南缘的玛纳斯—乌鲁木齐—吉木萨尔一带出露完整。这套地层的下、中部基本上是以灰绿色为主的砾岩、砂岩、泥岩夹煤层,最厚约3000多米,上部为一套红色或杂色为主的碎屑沉积,厚1000多米。1976年在西北地层工作会议上将新疆陆相侏罗系划分为六个组并统一命名为:八道湾组、三工河组、西山窑组、头屯河组、齐古组和喀拉扎组。但对其时代的划分一直存在着分歧。
The terrestrial Jurassic deposites are well-developed in the Junggar basin,of which the Lower and Middle Jurassic series are divided into the following four formations:the Badaowan,Sangonghe,Xishanyao and Toutunhe formations.From these formations the megaspores were discovered for the first time.Abundant megaspores may be divided into two different assemblages.The first one is present in the Badaowan and the Sangonghe formations,being represented by Calamospora sp.,Trileites pullus,T.turbanaeformis,T.murrayi,Hughesisporites junggarensis(sp.n.),Bacutriletes clavatus,Verrutriletes minutus(sp.n),Echitriletes hispidus,Horstisporites harrisi and Minerisporites institus,etc.;their age,is assigned to Early Jurassic.The second assemblage occurs in the Xishanyao and the Toutunhe formations,and is characterized by the dominace of Paxillitriletes phyllicus,and the presence of Trileites murrayi,Minerisporites richardsoni,Erlansonisporites spp.etc.These may be referred to Middle Jurassic.Besides,the analytical method for studying megaspores is introduced and two new species are also described in the paper.
作者
杨基端
孙素英
Yang Jiduan;Sun Suying(Institute of Geology,Chinese Academy of Geological Sciences)
出处
《地质学报》
1982年第4期373-380,387-388,共10页
Acta Geologica Sinica
