摘要
庞西垌地区位于钦杭成矿带南缘,该区复杂的地质演化历史导致了成矿地质背景的复杂性、成矿作用的多期性和多样性。分别应用地质统计学和因子多重分形(ρ-A)、因子多重滤波(S-A)对1∶50 000化探数据中Ag、Au含量数据进行了分析,获取了不同层次的矿致异常信息。结果表明:①泛克立格法获取的区域Ag、Au异常表明该区银金含量变化主要受庞西垌断裂、古城-沙铲断裂控制,这与多重滤波分形方法中的低通滤波获取的异常具有相似特征;②Ag含量的变化比Au有更好的连续性,Ag含量的变化表现出较强的结构性特征,而金含量的变化则表现出更强的区域特征;③因子多重分形(ρ-A)等值线图与该区的岩体分布有着良好的对应关系;④S-A模型能够提取不同层次的致矿异常信息,包括区域异常和局部异常,局部异常往往与矿化关系密切。通过F3主因子局部异常与泛克立格法识别的Ag、Au异常信息的融合,能增强与Ag、Au矿有关的地球化学异常信息,为研究区寻找该类矿床提供了科学根据。
Pangxidong area is located in the south margin of Qinhang metallogenic belt. The complex geo- logical evolution history leads to complex geological settings, multistage and various character of minerali- zation. 1 ： 50 000 survey data of Ag-Au from stream sediment are analyzed by geostatistics, factor multi- fractal（p-A）, multiple filter factor（S-A）methods, in order to obtain anomaly information caused by ore mineralization. The research results are as follows： （1） Regional anomaly of Ag, Au distribution by Uni- versal Kriging method is controlled by Pangxidong Fault and Gucheng-Shachang Fault, which has similar characters with the anomaly obtained by low pass filting wave with the application of multiple filter fractal method. （2） Variation of Ag concentration exhibits more continuous than Au in region, however, varia- tion of Au content present stronger regional characters. （3） Contour map obtained by factor multifractal method corresponds well with the regional distribution of rock bodies. （4）S-A model can substract anoma- ly information caused by ore mineralization, including regional and local anomalies, and the latter usually has closer relationship with mineralization. Overlapping of local anomalies confirmed by the F3 main factor and Ag, Au anomaly identified by Universal Kriging method can enhance the geochemical anomaly related to Ag, Au mineralization and provide scientific basis for looking for this kind of mineral deposit.
出处
《地质科技情报》
CAS
CSCD
北大核心
2014年第2期110-115,共6页
Geological Science and Technology Information
基金
中国地质调查局项目"广东庞西垌地区矿产远景调查"(1212010071012)
中山大学优秀青年教师培育计划(20103161319)
