柴达木盆地第四系放射性异常及成因机制  

A STUDY OF THE RADIOACTIVE ANOMALY IN QUATERNARY SEDIMENTS OF QAIDAM BASIN AND ITS GENETIC MECHANISM

作　　者：魏祥荣[1] 龙期华 

机构地区：[1]中国科学院广州地球化学研究所,广东广州510640 [2]核工业华东270研究所,江西南昌330200

出　　处：《物探与化探》2006年第3期189-193,198,共6页Geophysical and Geochemical Exploration

摘　　要：运用地质、物探、水文等多种手段,在分析异常区沉积环境、水文地质环境、砂体物质成分等基础上,对第四系航放异常的成因作了深入研究,确认:①异常元素主要来自于Q3-4自身碎屑物的淋离;②异常在空间上受Q3-4冲积扇前缘泥坪相与潜水氧化还原界面控制,因此认为该异常对成矿过程研究有重要价值,但对指导深部找矿意义不大。Geological, geophysical and hydrogeological means were applied to the study of radioactive anomalies in eastern Qaidam basin. Based on analyzing the depositional environment, hydrogeological environment and material composition of sand bodies in the anomalous area, this paper studied in detail the genesis of radioactive anomalies in Quaternary sediments （Q3-4）. Some conclusions have been reached： 1. The anomalies result from the leaching of Quaternary detrital minerals; 2. The anomalies are spatially controlled by the mud-platform facies of Quaternary （Q3-4） alluvial fan margin and the oxidation-reduction interface of phreatic water. It is thought that the anomalies are valuable in the study of metallogenic process, but have little significance in guiding ore prospecting work at depth.

关 键 词：镭异常 成因机制 柴达木盆地 

分 类 号：P631.6[天文地球—地质矿产勘探]