区域次生地球化学负异常模型及其意义

原生地球化学负异常的研究已经引起重视,特别是前苏联的化探工作者还总结出利用地球化学原生负异常对热液矿床进行普查和评价的准则.但是,由于缺乏可供对比的划分负异常的适当方法,使得对负异常的研究不能系统化,研究结果也不能互相对比,尤其是对于区域水系沉积物测量中发现的负异常研究很少.本文通过对几个地区衬值负异常的分析,系统地探讨了区域性负异常的分布特征、负异常与正异常的关系、负异常的地质意义和找矿信息等.总结出单元素和多元素区域负异常的分布模型.建立了AU和Cu矿床的区域正负、异常模型.提出了地球化学异常是由正异常和负异常组成的.

THE REGIONAL SECONDARY GEOCHEMICAL NEGATIVE ANOMALEY MODEL AND ITS SIGNIFICANCE

Importance has been attached to the study of primary geochemical negative anomalies.Especially in the former U. S. S. R., some geochemists summed up tab criteria for the application of geochemical primary negative anomalies to the exploration and evaluation of bydrothermal deposits. Nevertheless, due to the lack of a comparable method for classification negative anomalies, the study of negative anomalies oannct be spstematically carried out and the results are incomparable to each other. Sedies on the negative anomalies discovered in regional stream sediment survey, in particular, have been very insufficient. Based on the analysis of contrast value negative anomalies in several areas, this paper has dealt tentatively with the distribution of regional negative anomalies, the relationship between tha negative anomaly and the positive anomaly, and the geological sigaificance and prospecting information of negstive anomalies, summarized models for distribution of regional negative anomalies of single element and multiple elements, and established the ragional positive and negative anomaly models for gold ac copper deposits. It is pointed out that geochemical anomalies consist of positive anomalies and negative anomalies.