冀东滦县地区前寒武纪铁矿与火山喷发沉积旋回的关系

THE RELAITONSHIP BETWEEN PRECAMBRIAN IRON ORE DEPOSITS OF LUANXIAN DISTRICT, EASTERN HEBEI AND VOLCANO-ERUPTIVE SEDIMENTARY CYCLE

本区原岩建造是-套基性—酸性火山凝灰岩（主要）+铁硅质岩+沉积岩组合。整个层序反映了一个较完整的火山喷发沉积旋回。含铁建造与沉积旋回在时空和物源上存在着密切的成因联系。铁矿的形成及分布并非受控于某一种岩石,而是受控于火山喷发沉积旋回。本文从岩浆分异、火山活动、沉积作用及构造运动等的发生、发展、演化的角度较全面地分析了火山喷发沉积旋回的控矿作用。

The formation of original rocks in this region is a set of association of basic to acidic volcanic tuff, ferriferous silicilith and sedimentary rocks, taking volcanic rock as the dominant factor. The whole sequence represents a complete volcanic-eruptive sedimentary cycle. The close relation of origin is shown between the iron-formation and the sedimentary cycle in time,space and compositional source. The cyclical nature of iron ore stratum shows that the formation and distribution of iron ore deposits are out of strict control of certain kind of rocks, but under the control of volcano-eruptive sedimentary cycle. This paper overall deals with the role of controlling ore of volcano-eruptive sedimentary cycle, with respect to the ocurrence, development and evolution of magmatic differentiation, volcanic action, sedimentation and tectonic movement etc.