陕西秦巴地区地球化学分区及找矿意义

Geochemical Landscape of Qinba Area in Shaanxi Province and Its Prospecting Significance

依据陕西省秦巴地区1∶20万水系沉积物中测量的39个元素地球化学场及其异常分布规律、异常元素组合类型、同一地质构造单元经历相似的地质-地球化学演化过程、主成矿元素在不同地段的富集特征及地质构造单元、成矿条件、控矿因素等,同时参考地球物理等方面资料,将陕西省秦巴地区划分为6个地球化学区,32个地球化学亚区。结合各区的成矿地质背景、矿产分布特征、地球化学特征等对其找矿前景进行了分析总结。认为华北地块小秦岭地球化学区是寻找金、钼、铅、铀等矿产的有利地区;秦岭造山带秦祁昆关山-香泉地球化学区金具有一定找矿前景;秦岭造山带北秦岭地球化学区是寻找铬、镍、金、锑、银、钼等矿产的有利地区;秦岭造山带南秦岭地球化学区寻找金、锑、汞、银、铅、锌矿产潜力巨大,但钨、钼、铜、钒、磷等矿产也不容忽视;秦岭造山带北大巴山地球化学区目前虽矿产种类繁多,可矿产地较少,有待进一步探索研究;扬子陆块北缘地球化学区寻找金、铅、锌、铜、铁、铬、镍、磷、锰等矿产前景广阔,具寻找大型、超大型矿产的资源潜力。

The Qinba area of Shaanxi province is divided into six geochemical zones and 32 geochemical sub-regions based on several aspects,such as the 1∶200000 stream sediment survey,the elementary abnormal distribution pattern,the abnormal element combination type,the similar geology-geochemical evolution process of the same geological unit,the enrichment characteristics of the main ore-forming elements in different districts,the metallogenic conditions,the orecontrolling factors and the geophysical data.And then the prospecting potential has been analyzed and summarized.It is found that the geochemical area of Xiaoqinling in North China is a favorable area for prospecting Au,Mo,Pb and U;The Qinshen-Guanquan-Xiangquan geochemical area of Qinling orogenic belt has a certain prospecting potential for Au;The geochemical area of northern Qinling orogenic belt is a favorable prospecting area for Cr,Ni,Au,Sb,Ag and Mo;The geochemical area of southern Qinling orogenic belt has large potential for Au,Sb,Hg,Ag,Pb and Zn,while the potential for W,Mo,Cu,F and P also cannot be ignored.The northern Dabashangeochemical area of Qinling orogenic belt has a wide range of mineral resources,deserving to be further explored.The geochemical area of the northern margin of the Yangtze block has a promising prospect for finding large and super-large mineral deposits,such as Au,Pb,Zn,Cu,Fe,Cr,Ni,P and Mn.