摘要
从对那丹哈达岭地区的调查研究表明,那丹哈达地区为—由侏罗纪滑动沉积杂岩所组成的中生代地体。<1>本区出露有石炭、二叠纪石灰岩、三叠纪层状硅质岩和枕状基性熔岩及堆积杂岩(主要为单辉岩、辉长岩等)以及侏罗纪的硅质岩、硅质页岩等,其岩石组合基本表现了洋壳特征,可能为远洋沉积;<2>.其中的石炭、二叠纪石灰岩明显地呈透镜状产出于三叠纪和二叠纪硅质岩之中;<3>.从本区出露的硅质岩中分别采到三叠纪晚期(T_3)和侏罗纪中期的放射虫化石;<4>本区与其西侧的双鸭山地体及南侧的延吉地体的岩石组合有明显的不同,尤其是侏罗纪时,那丹哈达地体表现为海相,而其近邻则为陆相或海陆交互相,并含有很好的煤层。
On the basis of a comparison and analysis of various terranes on the continerntal margins of eastern China, the authors discuss the stratigraphic sequences and rock associations of the Mesozoic Nadanhada terrane in northeastern China. This terrane is composed of upper Paleozoic and Mesozoic pillow lavas, limestones, edded cherts, shales, siliceous shales and sandstones. Triassic and Jurassic radiolarian fossil are found in the bedded cherts and siliceous shales. Carboniferous and Permian limestone lenses are found in Erlianqiao, which occur as olistoliths, intercalated together with blocks of basic lavas in weakly sheared Triassic and Jurassic sandstones and shales. So they are considered to be Mesozoic olistotromic complex.
出处
《地质论评》
CAS
CSCD
北大核心
1989年第1期67-71,共5页
Geological Review
