| 羌塘高原典型矿区水系沉积物地球化学特征与区域化探扫面方法 |
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| 关键词:Qiangtang Plateau stream sediments geochemical characteristics regional geochemical survey methods |
| 基金项目:中国地质调查局地质调查项目(编号: 200220130001; 12120113101200) |
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| Geochemical Characteristics of Stream Sediments and Regional Geochemical Survey Methods in the Qiangtang Plateau |
| The Qiangtang Plateau is the largest area not covered by the RGNR (Regional Geochemistry-National Reconnaissance Program) and also a new working area of the geological prospecting work, where the geochemical exploration scanning work and geological prospecting work are in advance. Stream sediment survey is the main method of the RGNR. In the Qiangtang Plateau, Aeolian sand deposit is widespread, and more than 90% fragment sizes of this kind of sand are concentrated in –40 meshes, which is the major factor influencing the prospecting effect of the RGNR. Some conclusions have been reached on the basis of the study of the geochemical characteristics of stream sediments in four ore districts: 1) Stream sediments have different fraction sizes, and most of the mineralization-indicating elements exhibit asymmetric “inversed S” type or “U” type distribution and are concentrated in the –40 mesh fraction and +160 mesh fraction. With –10 ~ +40 mesh as the sampling fraction, the interference of the eolian sand can be eliminated to a great extent. 2) For the large ore deposit, the migration distance of the indicator element anomaly is 4~8 km along the stream systems, with the anomalous area being >25 km2; for the small ore deposit, the migration distance is about 1 km, and the anomalous area is 1 km2 or so. 3) The best technical criteria for the identification of the RGNR are as follows: the sampling fractions are –10 ~ +40 mesh, the sampling density is 1/4 km2 (exploration targeted at large or superlarge deposits) or 1/km2 (exploration targeted at small deposits). |
| YANG Shao-ping,LIU Hua-zhong,KONG Mu,ZHANG Hua,LIU Ying-han,ZHANG Xue-jun,GAO Shun-bao,ZHENG You-ye.2015.Geochemical Characteristics of Stream Sediments and Regional Geochemical Survey Methods in the Qiangtang Plateau[J].Acta Geoscientica Sinica,36(3):367-376. |
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