化探数据处理的新技术

A NEW TECHNIQUE FOR EXPLORATION GEOCHEMICAL DATA PROCESSING

本文论述了一种新的空间点数据处理系统（NASSD）在化探数据处理中的应用效果。以NASSD处理平均采样密度为每15000km2一个，样品总数为529个的泛滥平原沉积物数据，制作的中国铜和银地球化学图，可以较清晰地指示出中国已知大型、超大型铜和银矿床的分布。以传统的数据处理方法无论是处理上述的极低密度采样数据还是每1km2～50km2一个的区域水系沉积物测量数据，在制作（以相同含量间隔表示）的全国地球化学图上对大型、超大型矿床都还缺乏良好的显示。因此，在对大型、超大型矿床进行战略性探查方面，将NASSD技术与极低密度地球化学填图相结合，可能是一条高效率、低成本的可行途径.NASSD可与各种GIS相连接。在“国际地球化学填图”项目中应用NASSD，或许可以有效地促进制作全球地球化学图的进程，并提高地球化学图在环境研究和全球超大型矿床预测方面的实用价值。

The paper expounds the results of application of a new spatial pont data processing technique (NASSD-Nonlinear analysis system for spatial data) to exploration geochemical data processing, In Chinese Copper and Silver geochemical maps NASSD is applied to the data processingof Cu and Ag contents from 529 flood-plain sediment samples nearly cvering the whole land surface of China with average sampling density 1 sample per 15000km2. Over 80% known large andsuperlarge Cu and Ag deposits can be clearly indicated. However, no matter when other traditional data processing methods are applied, either to the above-mentioned data from average sampling density i sample per 15000km2 or to the RGNR stream sediment survey data from samplingdensity 1 sample per 1km2 - 50km2, the geochemical maps (in the same isopleth as the geochemical map generated from NASSD) have poor information about the distribution of the large andsuperlarge deposits. Therefore, in strategic exploring for large and superlarge deposits, it may bea feasible tool with high efficiency and low cost to combine NASSD with the wide-spaced geo-chemical mapping. NASSD can be combined in various GIS. If NASSD technique has applicationin the lnternational Geochemical Mapping Project, it is possible to bring about an advance in thepreparation of a World Geochemical Atlas and increase the usable values 0f a global geochemicalmaps in environmental investigations and the global prediction of superlarge deposits.