【摘要】 由于受到覆盖区矿体埋藏深度以及表生地球化学作用的影响,隐伏矿致异常以及弱缓化探异常信息的识别一直是地球化学勘查的难点。张八岭-管店地区位于安徽东部张八岭构造带北部,地表多被第四系覆盖,已有研究显示该区具有较好的Au成矿潜力。本文以Au矿床作为找矿目标,开展了面积性深层土壤取样,并利用多重分形理论的局部奇异性指数分析方法对深层土壤Au元素地球化学异常信息进行提取。结果表明,深层土壤Au元素的地球化学异常能够有效识别已知的金多金属矿(化)点,同时较好的反映出深部隐伏断裂构造与已知矿(化)点的空间关系;较之传统方法,基于非线性理论的奇异性指数方法能够有效降低地球化学背景场的影响,具有更好的异常识别效果,可应用于隐伏或亚出露环境下的地球化学异常识别研究。更多还原

【Abstract】 Due to the influence of burial depths of orebodies of deposits and the supergene geochemistry of overburdens,the identification of information caused by hidden orebodies and weak geochemical anomalies has been a hot and difficult topic for a quite long period in the geochemical exploration field. Though the Zhangbaling-Guandian area,located in the northern part of the Zhangbaling tectonic belt in eastern Anhui,is mostly covered bythe Quaternary system,it has a good potential of gold mineralization based on previous research results. In this paper,focusing on exploring the target of Au mineralization,we have undertaken the 1 ∶50000 scale deep soil geochemical sampling in the Zhangbaling-Guandian areain order to extract geochemical anomalies of Au element in deep soils in the area based on the analysis of local singularities using multifractal theory. The results show that the geochemical anomalies,effectively identifiedby the deep soil Au geochemistry,are in good accordance with known Au-polymetallic deposits or occurrences in the area,and have reflected the good spatial relationship between deep concealed fractures and known ore depositsor mineral occurrences. Comparing to traditional methods,the singularity mapping technique based on non-linear theory can effectively reduce the impact of geochemical background field,has tremendous advantage for identifying geochemical anomalies,and can be applied in the study for identifying geochemical anomalies in the hidden or shallow depth environment.更多还原