磷块岩的内碎屑

内碎屑磷块岩是工业磷块岩矿床中一种常见的和重要的矿石类型,它和各类粒状磷块岩一起,常常构成磷块岩矿床的主体。 “内碎屑”原系福克碳酸岩分类中异化颗粒的一种,是指那些经过改造的、接近于同生的碳酸盐沉积物的碎屑,因为是在盆地内形成的,因此也称盆屑。

STUDY ON THE INTRACLAST OF PHOSPHORITE

The intraclastic phosphorite is common and important type of the industrial ores.The composition,structure and distribution of the intraclasts of phosphorite have been studied.Because of the change of sedimentary environment,the original phosphorite has been subjected to disintegration,scouring and sorting before consolidation,as a result,it became the anguclast of various size.It was deposited,cemented and consolidated in situ or by transporing at short distance.This is a kind of phosphate intraclast formed with in a mineralization basin.These processes might have repeated many times through whole formation process of intraclast.The varieties of intraclast formed in geological processes can be distinguished according to their characteristic composition and structure,then the environment of formation can be interpreted.According to the different geological processes can be distinguished three types of phosphorite intraclast,i.e.tidal beach,syndepositional structure and scouring of bottom current of a marine basin.