引言卷型矿床在其空间和成因上与蚀变(通常称氧化)主岩的不规则舌形带有关,后者的边界通常与包围着的未蚀变岩石显著不同。未蚀变主岩为典型的浅灰-暗褐色砂岩,含有千分之几未受成矿作用影响的分散状黄铁矿,而蚀变岩石则很少含或不含黄铁矿,呈白色、浅灰 Introduction Volumetric deposits are related in their space and genesis to the irregular tongue band of altered (commonly called oxidized) host rocks, the boundaries of which are usually significantly different from the surrounding unmodified rocks. The unmodified host rock is a typical light gray-dark brown sandstone with a few thousandths of undulating pyrite not affected by the mineralization, whereas the altered rock contains little or no pyrite and is white Light gray