中国南部湿润半湿润丘陵山区不同粒级水系沉积物地球化学特征对比研究

发布时间：2018-07-07 22:34

本文选题：采样粒级 + 水系沉积物　；参考：《岩矿测试》2017年02期

【摘要】：不同景观条件下选取合适的采样粒级是准确地获取地球化学信息,提升地质找矿效果的关键。为研究中国南部湿润半湿润中低山丘陵景观区水系沉积物测量最佳采样粒级,本文在安徽省南部胡乐司—宁国墩地区开展了区域化探采样粒度方法技术试验,采集-60目和-10目~+80目两种粒级样品,采用波长色散X射线荧光光谱法和电感耦合等离子体质谱法为主体的配套分析方案和测试技术获取了全国区域化探扫面规定的40种元素高精度数据。研究表明:两种粒级水系沉积物中造岩元素背景含量与区域岩石背景值基本接近,其他微量元素多呈富集状态,以-10~+80目粒级中As、Au、Hg、Mo、Pb、Sb等成矿元素富集程度最强;-10~+80目粒级受后期表生改造作用影响较弱,最大限度保留了原生地球化学分布特征,并在准确圈定与矿化有关的异常和清晰反映矿致异常特征等方面明显优于-60目粒级。因此,建议在安徽省南部中低山丘陵景观区,选择-10~+80目粒级为水系沉积物测量的最佳采样粒级,研究结果可以为中国相似景观区地球化学勘查找矿水系沉积物测量采样粒级的选择提供参考。
[Abstract]:Selecting the appropriate sampling grain level under different landscape conditions is the key to obtain the geochemical information accurately and improve the geological prospecting effect. In order to study the best sample size for the water system sediment measurement in the humid and semi humid middle and low hilly landscape area in southern China, the regional geochemical sampling is carried out in the Hu Le division of the south of Anhui province and the Ningguo pier area. Two grain grade samples of -60 and -10 order ~+80 are collected by the method of granularity method. The analysis scheme and test technique of wavelength dispersive X ray fluorescence spectrometry and inductively coupled plasma mass spectrometry (ICP MS) are used to obtain the high precision data of the 40 elements stipulated in the national regional scavenging surface. The study shows that two kinds of grain grade water systems are deposited. The background content of rock forming elements is basically close to the value of regional rock background, and the other trace elements are mostly enriched, and the enrichment degree of As, Au, Hg, Mo, Pb and Sb in -10~+80 grain size is the strongest, and the -10~+80 mesh size is weakly influenced by the later epigenetic transformation, and the primary geochemical distribution features are retained, and accurate. The anomaly of delineation and mineralization related to mineralization and clearly reflecting the anomaly characteristics of ore are obviously superior to the -60 grain size. Therefore, it is suggested that the best sample size of -10~+80 meso scale is chosen in the middle and low hills and hilly landscape area of southern Anhui Province, and the results can be used for the geochemical exploration and prospecting in the similar landscape area of China. The selection of sample size for material measurement provides reference.
【作者单位】：安徽省地质调查院;
【基金】：中国地质调查局地质调查项目(1212011120938,1212011220592)
【分类号】：P632

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