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
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摘要: 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。Abstract: 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 ore-controlling 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 Dabashan geochemical 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.
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Key words:
- prospecting significance /
- geochemical landscape /
- Qinba area /
- Shaanxi province
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