新疆伊犁小于赞金矿床中FeS2的矿物学研究

小于赞金矿床赋存于下石炭统大哈拉军山组上亚组中酸性火山岩及火山碎屑岩中,为浅成低温热液型金矿。文章通过对小于赞矿区金矿床中FeS2的矿物学研究,对摸清金矿的机理具有现实意义,对指导该区进一步找矿具有重要意义。     

Investigation of sulfur speciation in particles from small coal-burning boiler by XANES spectroscop

Sulfur K-edge X-ray absorption near-edge structure （XANES） spectroscopy was employed to study the speciation of sulfur in raw coal, ash by-product and fine particulate matter from a small coal-burning boiler. By means of least square analysis of the XANES spectra, the major organic and inorganic sulfur forms were quantitatively determined. The results show that about 70% of the sulfur in raw coal is present as organic and a minor fraction of the sulfur occurs as other forms： 17% of pyrite and 13% of sulfate. While in bottom ash, fly ash, and PM2.5, the dominant form of sulfur is sulfate, with the percentage of 80,79 and 94, respectively. Moreover, a number of other reduced sulfur including thiophenic sulfur, element sulfur and pyrrhotite are also present. During coal combustion, most of organic sulfur and pyrite were oxidized and released into the atmosphere as SO2 gas, part of them was converted to sulfate existing in coal combustion by-products, and a small part of pyrite was probably reduced to elemental sulfur and pyrrhotite. The results may provide information for assessing the pollution caused by small boiler and developing new methods for the control of SO2 pollution.     

粤西眼球状花岗岩FeS_2拉曼光谱特征及意义(英文)

选取粤西官山嶂岩体眼球状花岗岩研究其内不同形态和期次FeS2的拉曼光谱特征。结果显示各组样品拉曼位移(Δν)、散射强度(Ι)及其半高宽(FHWM)明显不同。分析表明条带状样品拉曼位移Δν1,Δν2,Δν3分别位于318,381和440cm-1附近;而骸晶样品对应值分布于344,379和430cm-1附近;且与后者相比变形、自形样品对应Δν分别较向低频偏移。条带状样品ΙEgΙAgΙTg而其余样品ΙEg≈ΙAgΙTg;且自骸晶样品向自形、变形样品Ι及FHWM值均依次增大。上述光谱证据指示条带状样品Δν及Ι与白铁矿相似而其余样品均展现出黄铁矿的特征。与骸晶样品相比变形、自形样品Δν向低频偏移表明后二者形成温度依次增高;骸晶、自形、变形样品Ι及FHWM递增表明三者形成压力依次明显增大。据此研究认为官山嶂岩体内黄铁矿形成先后经历了:白铁矿期→高压黄铁矿期→高温黄铁矿期→常温常压蚀变期。     

过氧化氢在黄铁矿的溶解过程中对铼-锇信号强度及年龄的影响

对黄铁矿在高温高压密闭的Carius管溶解过程中出现的黄色沉淀物进行了定性研究。在黄铁矿中加入少量的辉钼矿及185Re和190Os混合稀释剂,在常规的逆王水溶矿过程中加入适量H2O2,用ICP-MS检测,研究了H2O2对Re、Os信号强度变化及同位素交换平衡产生的影响。结果表明,在黄铁矿溶解过程中出现的黄色沉淀物为羟基硫酸铁(FeOHSO4)而不是单质硫,它是由于密闭的Carius管内氧化性不够而生成的。H2O2的加入对ICP-MS测定Re信号强度没有影响,而对Os则有显著的改善,但这种改善并未影响到加入的185Re和190Os稀释剂与样品中的Re和Os达到同位素交换平衡,因而也不影响到样品的Re、Os含量及最终的Re-Os同位素年龄计算。