摘要
浙江省常山叶蜡石成矿带位于常山县城东北的桥坑—金源一带,矿体赋存于中元古界上墅组第一段变质火山岩系中。成矿作用受地层层位和构造的双重控制,气液蚀变过程中 K_2O 被带出,Al_2O_3相对富集而形成矿体。矿石有致密状与角砾状两种类型,矿石矿物以叶蜡石为主,少见高岭行和伊利石。
The Changshan pyrophyllite mineralization belt in Zhejiang province lies in the area from Qiaoken to Jinyuan to the northeast of Changshan County Town.The pyrophy- llite bodies mainly occur in metavolcanic series of the first member of the Middle Proterozoic Shangshu Formation.The mineralization is controlled stratigraphically as well as structurally. The pyrophyllite bodies were formed by the loss of K_2O and relative enrichment of Al_2O_3 during a pneumato-hydatogenetic alteration process.There are two types of pyrophyllite ores ——compact and brecciated,which are composed essentially of pyrophyllite associated with minor kaolinite and illite.
