摘要
黔西北铅锌矿床底层控矿床，主要赋存在上古生界尤其是石炭系中。研究表明：下古生界铅锌含量高于上古生界；矿床分布受地质构造严格控制；含矿层沉积时的岩相古地理条件不利于形成金属硫化物矿源层；矿石的Ｐｂ／Ｚｎ值与含矿层不一致；矿石的铅同位素组成属混合铅；矿石稀土配分模式与含矿层不相似。故下古生界初步富集的金属和分散的金属是该区主要的矿质的来源。
The lead-zinc deposits in northwestern Guizhou are strata-bound ones occurring mainly in Upper Paleozoic Erathem, especially in the Carboniferous System. The distribution of deposits is controlled strictly by geologic structures and the contents of lead and zinc in Lower Paleozoic are mueh higher than that of Upper Paleozoic. Paleogeographically, the formation of source beds is not favourable. Ratio Ph / Zn in ores are not consistent with that of the ore-bearing beds, The isotopic compositions of ore lead are mixed lead. The REE curves in ores are not consistent with those of the ore-bearing beds. It is considered that the concentrated and difused lead and zinc in Lower Paleozoic are the mainly sources to form Ph-Zn deposits rather than the ore-bearing beds.
关键词
铅锌矿床
层控矿床
矿质来源
lead-zinc deposits
stratabound ore deposits
geochemistry/ source of bearing materials
epigenesis
