摘要
文章对西南三江南段1∶20万区域地球化学测量数据进行了衬度值、泛克里格、地球化学块体、多重分形(S_A法)、变化及统一背景等多方法处理,计算了Cu、Pb、Zn、Au、Ag等元素异常及相关分析,取得了较好的效果。认为对矿产资源评价靶区的优选和工作部署,多重分形和泛格里格法较为合适,宏观上研究区域地质构造的地球化学特征,宜选择较大半径的衬值异常和泛格里格异常。“变化背景”的异常信息量丰富,对寻找隐伏矿、深埋藏矿有利,对于基性火山岩发育区的高Cu背景,多重分形法不失为一种提取有用信息、压制干扰的有效方法之一。
In the Sanjiang （Nujiang River, Lancang River and Jinsha River） region of southwestern China, geological structures are very complex, magmatic activities are extremely strong, and ore-forming fluids are quite active. Therefore, this region is the most potential concentration area for nonferrous and noble metal resources in China. In the past ten years, more than ten large and superlarge ore deposits in this region have been discovered and evaluated. The reinvestigation and reprocessing of the data available has played a very important guiding role in the delineation of target areas as well as in the exploration and evaluation work. Since 2000, the Yurman Academy of Geological Survey has used various data-processing methods such as contrast, universal Kriging, geochemical block, multiple fractal, variation and integrated Anomalies of such elements as Cu, Pb, Zn, Au and Ag background to process the 1：200000 geological data. were calculated, and correlation analysis was made. As a result, fairly good results have been obtained. It is held that, in the optimization of target areas and the arrangement of work, multiple fractal and universal Kriging seem to be relatively ideal methods. In the study of geochemical characteristics of regional geological structures, the selection of the contrast anomalies and universal Kriging anomalies with relatively large radii is likely to yield good results. The ＂variation background＂ anomalies contain abundant information, and can hence be used to seek for concealed and deep-buried ore deposits. As for the high Cu background places in the basic volcanic area, the multiple fractal method seems to be one of the effective methods for extracting useful information and suppressing interference.
出处
《矿床地质》
CAS
CSCD
北大核心
2006年第4期501-510,共10页
Mineral Deposits
基金
中国地质调查局"西南三江南段成矿规律和找矿方向综合研究"(200110200009)项目的资助
关键词
地球化学
地球化学数据
处理
三江南段
geochemistry, geochemical data, processing, application, contrast, the southern part of Sanjiang region
