【摘要】 该区的银多金属矿床在空间上受前中生代基底东西向深大断裂和中生代的北东向构造岩浆带控制,由东向西构成北东—东西向带状分布的银多金属矿带集中区。其成矿与中元古代和中生代火山活动关系密切;即中元古代大红峪碱性玄武岩,中生代的酸性偏碱性火山岩。古元古代的变粒岩、中、新元古代的沉积岩中的特定层位和中生代燕山期张家口旋回火山岩具有矿源层特征。根据地质地球化学特征,提出该区存在四类银多金属矿床的认识。更多还原

【Abstract】 Many silver—multimetallic deposits are found in the central section of the northern margin of North China platform. They are spatially controlled by the large scale deep-seated basement faults with a strike of West-East formed pre-Mesozoic and the late Mesozoic tectonomagmatic belt extending along the direction of NE. So they formed the silver—multimetallic province distributing along the NE to WE direction in form of long belt. Genetically, their mineralization has intimate relationship with the two volcanic activities, which are Dahongyu volcamism errupted during Mesoproterozoic with a alkali-basalt dominated volcanic rock series and Yanshanian volcanism errupted during Mesozoic with a alkalized intermediate and acidic rock series. The Paleoproterozoic granulitite, some beds of Meso- and Neoproterozoic sedimentary rocks and rocks from the Zhangjiakou volcanic cycles of Mesozoic Yanshanian have the characteristics of metal source with high concentration of metallic elements, such as Ag,Cu,Pb,Zn. silver—multimetallic deposits are geologically and geochemically classified into four main types which are Ag-Pb-Zn, Ag-Cu, Ag-Au and Ag-Mn type respectively.更多还原