华北地台西南缘矿床的亲缘性及其找矿意义

华北地台西南缘山西中条山和河南小秦岭两地区在晚太古宙—元古宙曾是豫—晋—陕三向裂陷槽的主要组成部分,均发育具大陆裂谷环境双模式的拉斑玄武岩、碱性玄武岩及部分钙碱性火山岩建造,构建了两个地区的原始地壳和初始矿源层。稀土元素配分模式和常量元素及微量元素特征表明二者均具相同的富集型和亏损型,表现出成矿物质来源的同源性及成矿演变的继承性。在层位和岩性控矿、同位素地球化学特征、成矿溶液组成及成矿物化条件等方面两地非常近似,并表现出成矿的多元、多源、多期、多阶段的明显层控矿床的特征,佐证了中条山和小秦岭两个地区矿源层和矿床亲缘性的存在,由此认为在"富铜"的中条山地区应注意找金,在"富金"的小秦岭地区应注意找铜。通过华北地台西南缘矿床亲缘性的研究,可以有助于华北地台西南缘地区的新一轮找矿工作的开展。

THE CONSANGUINITY OF ORE DEPOSITS IN SOUTHWESTERN NORTH CHINA PLATE AND ITS SIGNIFICANCE TO PROSPECTING

The two areas of Shaanxi Province′ Zhongtiao Mountain and Henan Province′ Xiaoqinling lie on the southwest margin of North China Plate,they once upon a time were the main component parts of Yu(Henan Province)-Jin(Shanxi Province)-Shan(Shaanxi Province) three-direction split-trap trough in later Archaeozoic to Proterozoic Era. They both had developed a serial double-mode rock-constructure in the condition of mainland rift valley, being consisted from tholeiitic basalts,alkalescence basalts and part of calcium-alkalinity volcanic rocks which constructed the primary earth's crust and the intial stage mine-source straturms of the two areas .Lanthanon has the same enrichment and deficit mode with constant element and trace element in a collection of illustrative plates . This shows that the sources of all mineralizational material were isogenic, and the mineralization had been evolved inheritantly. The two areas are approximate fabulosityly in controlling-mineral straturms and lithologies, isotopic geochemistry, compositions of mineralizational liquor, and mineralizational physical-chemical conditions. At the same time, the mineralization has polyside, polygenetic, polyperiod, and polystage character which is similar to stratabound deposit's. All these above prove that there is affinity between the mine-source straturm and deposit in Xiaoqinling area and Zhongtiao Mountain. So it can be concluded that we should pay attention to looking for gold in rich-copper Zhongtiao Mountain, and looking for copper in rich-copper Xiaoqinling area. By studying the affinity of those deposits in the southwest margin of North-China Plate, it will promote new-stage deposit exploration in China.