中国硒矿资源概述

硒在地球上含量很低，难以形成独立的经济矿床，常作为伴生矿产出。硒矿石不仅广泛用于化工、冶金、建材、电子、医药等工业部门，而且是人体不可缺少的微量元素，享有“生命的奇效元素”之美称。中国硒矿资源丰富，可划分为岩浆、斑岩、矽卡岩、热液型伴生矿床、沉积型独立矿床及硒矿泉水等不同类型。在不同时期的滨海相碳质建造、矽卡岩型矿床及构造蚀变岩中，具有良好的找矿前景。

AULACOGENS OF MIDDLE LATE PROTEROZOIC PERIOD ALONG THE NORTHERN MARGIN OF NORTH CHINA PLATFORM

In Middle Late Proterozoic period, a cluster of aulacogens were finally derived from the graben basins associated with the fracturing of the crust thickened North China platform due to upwelling of mantle plumes. They rested from west to east,including (1)Baiyunebo Huade,(2)Chaertai Shangyi Longhua,(3)Yanshan Xunhe,and (4)Fuzhou Taizihe Hunjiang.These aulacognes all received Middle Early Proterozoic,persistent or sub persistent accumulations which,typical of the Yanshan accumulation mode,make it possible for them to stratigraphically compare among each other,regardless of the local lithofacies differences because of the extent of the crust fructuring.