武当隆起西北缘淋滤型绿松石成矿远景区预测

绿松石是Cu、Al的磷酸盐矿物集合体,是具有很高价值的宝石矿产。武当古陆西缘的湖北与陕西交界处是高品质绿松石的重要产区。通过对绿松石矿床地质特征、产出地质条件分析,认为绿松石矿床主要产于下寒武统(含炭)硅质岩中,受断裂构造控制。结合矿床物化探特征,提出了该区绿松石矿床的找矿标志为:寒武系(含炭)硅质岩层、断裂构造发育、Cu高含量区域、放射性强度高(U含量较高)。根据地质及物化探资料圈定了绿松石矿床的一级、二级成矿远景区。

Minerogenic prospective prognosis of leaching type turquoise on the northwestern margin of Wudang Uplift

Turquoise,a phosphate mineral assemblage of Cu,Al,is a valuable gem mineral. The western margin of Wudang Uplift in Hubei-Shaanxi border is an important producing area of high quality turquoise. Based on an analysis of geological characteristics and geological conditions of turquoise deposits,the authors hold that turquoise deposits mainly occur in lower Cambrian( carbon-bearing)siliceous rocks and are controlled by fault structures. Combined with the geophysical and geochemical characteristics of the deposits,the authors point out some ore-hunting indicators of turquoise deposits in this area as follows: Cambrian( carbon-bearing) siliceous strata,well-developed fault structures,areas with high Cu content,and areas with high radioactivity( high U content). According to geological,geophysical and geochemical data,the first and second order minerogenic prospective areas of turquoise were delineated.