在许多热液矿床中,在沉积作用的主要成矿阶段之前或同时,都会引入大量的二氧化硅。这种二氧化硅可以在张开的裂隙中形成石英脉,也可普遍交代矿床周围的容矿岩石,如所谓的“似碧玉岩”硅化岩体。这种含矿似碧玉岩的露头因风化而分离出来的碎屑,可以搬离原生露头很远,开始是山麓堆积巨块和砖石,然后成为河流沉积物中的漂砾、中砾和卵石。如果能把河流沉积物中的这种岩石同其他硅质碎屑岩石区分 In many hydrothermal deposits, large amounts of silica are introduced before or at the same time as the major metallogenic stage of sedimentation. This type of silica can form quartz veins in open fractures and can also generally account for ore-bearing rocks surrounding the deposit, such as the so-called “jasper-like” silicified rock mass. This mineralized jasper-like outcropper’s debris separated by weathering can be moved away from its original outcrops, beginning with piles of massive fossils and masonry at the foothills and then boulders, pebbles and pebbles in river sediments . If we can distinguish such rocks in river sediments from other siliceous rocks