应引起重视的几种常见弱小化探异常  

Several kinds of common weak geochemical anomalies that deserve attention

作　　者：张灯堂 刘宗彦 岳涛 何进 赵瑞 ZHANG Deng-Tang;LIU Zong-Yan;YUE Tao;HE Jin;ZHAO Rui(No.1 Geology and Mineral Resources Survey Institute of Henan Geology and Mineral Exploration and Development Bureau,Luoyang 471023,China;Ecology and Exploration Geochemistry Application Engineering Technology Center of Henan Province,Luoyang 471023,China)

机构地区：[1]河南省地质矿产勘查开发局第一地质矿产调查院,河南洛阳471023 [2]河南省国土资源厅生态与勘查地球化学应用工程技术中心,河南洛阳471023

出　　处：《物探与化探》2018年第5期1049-1053,共5页Geophysical and Geochemical Exploration

基　　金：河南省地矿局科研攻关项目(2016[04]);河南省国土资源厅科研项目(2013-16)

摘　　要：人们在评价和解释化探异常时,往往将注意力集中在"高、大、全"的化探异常上,对面积小、强度弱、叠加程度低的异常关注很少。笔者通过研究大量的大型、特大型矿床的地球化学特征,结合化探工作的切身体会,认为有几种弱小的化探异常值得重视,特别是那些成因上与筒状岩株有关的斑岩型矿床,其矿致化探异常往往面积小、强度低,但与这些小异常有关的矿床规模可能是大型,甚至是特大型,形成了"小异常成大矿"的反常现象,在解释评价时,这类异常很容易被忽略。另外,有规律排列的单点异常、覆盖区的弱小异常均能够代表一定的地质意义,在化探异常解释评价时值得重视。When people evaluate and explain geochemical anomalies,they often focus on ＂ high,large and overall＂ geochemical anomalies and pay little attention to anomalies with small areas,weak intensity and low superposition. Based on geochemical characteristics of a large number of large and superlarge ore deposits in combination with geochemical practice,the authors hold that there are several kinds of weak anomalies which deserve attention,especially the geochemical anomalies in the porphyry deposits related to tube like rocks,which are usually small in size and low in intensity. However,the size of the deposits related to these small and weak anomalies may be large or even superlarge,resulting in an abnormal phenomenon of ＂ small anomaly corresponds to large ore deposit＂. This kind of anomalies is easily ignored in the interpretation of evaluation. In addition,regular single point anomalies and small and weak anomalies in the coverage area can represent certain geological significance. These anomalies deserve attention in the interpretation and evaluation of geochemical anomalies.

关 键 词：地球化学勘探 弱小异常 异常解释 异常评价 

分 类 号：P632[天文地球—地质矿产勘探]