| 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 |
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| 引用本文： | 陈富荣,史春鸿,梁红霞.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[J].岩矿测试,2017,36(2):136-145. |
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| 作者姓名： | 陈富荣 史春鸿 梁红霞 |
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| 作者单位： | 宜春市农产品质量安全检验检测中心, 江西 宜春 336099,江西省地质调查研究院, 江西 南昌 330030,江西省地质调查研究院, 江西 南昌 330030 |
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| 基金项目： | 中国地质调查局地质调查项目（1212011120938，1212011220592） |
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| 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。
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| 关 键 词： | 重晶石 黄铁矿 硫 高频红外碳硫仪 |
| 收稿时间： | 2015/8/4 0:00:00 |
| 修稿时间： | 2016/12/5 0:00:00 |
Geochemical Characteristics Comparison of Different Scale Sediments in the Humid and Semi-humid Hilly Area, Southern China |
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| CHEN Fu-rong,SHI Chun-hong and LIANG Hong-xia.Geochemical Characteristics Comparison of Different Scale Sediments in the Humid and Semi-humid Hilly Area, Southern China[J].Rock and Mineral Analysis,2017,36(2):136-145. |
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| Authors: | CHEN Fu-rong SHI Chun-hong and LIANG Hong-xia |
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| Institution: | Agricultural Product Quality Safety Testing Center of Yichun City, Yichun 336099, China,Institute of Geological Survey of Jiangxi Province, Nanchang 330030, China and Institute of Geological Survey of Jiangxi Province, Nanchang 330030, China |
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| Abstract: | Most of sulfate and sulfide ores are composed of low electric magnetic materials. In the process of combustion, the sulfur in sulfate and sulfide ores cannot be released completely, because it is difficult to produce large electromagnetic induction eddy current. Thus, the results are lower than real values when the sulfur in sulfate and sulfide ores is determined by high-frequency infrared carbon-sulfur spectrometer. In this study, The barite and pyrite samples are diluted with silicon dioxide to acquire different contents of sulfur. By optimizing the sample weight and flux types, determination of sulfur by high-frequency infrared carbon-sulfur Spectrometer was developed. Results show that the sample weight is 0.07 g when the content of sulfur is higher than 2% whereas sample weight is 0.1 g when the sulfur content is below 2%. Furthermore, the sulfur in barite and pyrite can be released completely into infrared absorption area when adding 0.4 g of tin grain, 0.4 g of iron grain, and 0.5 g of tungsten grain to the sample. The recovery of sulfur can reach 95.3%-105.1%, which is far higher than the recovery of 83.3%-91.1% for the conventional analysis of sulfur by infrared carbon-sulfur spectrometer. This method precision is better than 5% and can realize the accurate determination of sulfur content. |
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| Keywords: | barite pyrite sulfur High Frequency Infrared Carbon-Sulfur Spectrometer |
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