华北地块北缘中段分布着许多大中型铅锌银矿床,依据其成因特征可划分为四种类型:沉积喷气型矿床、叠加改造型矿床、与大红峪期碱性......

The Chahe copper deposit occurs in the Early Proterozoic metamorphic series in the area of Chahe and its chalcopyrite yi......

火山碎屑岩是介于熔岩和沉积岩之间的过渡类型岩石 ,岩类复杂。长期以来 ,火山碎屑岩的分类研究受到了国内外学者的重视 ,先后提出......