中文摘要：

为探究盐类矿床中Br和I元素的影响因素及其对钾盐矿床成因的指示意义,采集思茅盆地勐野井的石盐、钾盐样品,采用X射线衍射方法分析了其盐类矿物组成,用ICP-OES和离子色谱仪测试了阳离子（K＋、Ca2＋、Na＋、Mg2＋）和阴离子（Cl^-、Br^-、I^-、SO_4^2-）组成。结果显示,样品的Br含量为89.08×10^-6~555.45×10^-6,高于海水含量,Br×10^3/Cl的质量比值为0.13~0.86,Br的主要影响因素是溶液的主要成分（SO_4^2-,K^＋,Ca^2＋和Mg^2＋）和蒸发作用;I含量为0.07×10^-6~0.27×10^-6,I×10^6/Cl的摩尔比值为0.03~0.11,略高于海水值,I含量随I×10~6/Cl摩尔比值的增加呈上升趋势,说明蒸发作用是影响卤水I含量的因素之一。但Br和I呈负相关,表明有机质的含量是I含量的主要影响因素,蒸发作用可能是次要影响因素,I和I×10~6/Cl摩尔比值可能是判断海陆相的潜在指标之一。

英文摘要：

In order to identify influence factors of Br and I of salt minerals and their implications to the metallogenesis of the potash deposit, salt samples collected from the Mengyejing potash deposit in Simao basin, Yunnan Province, have been examined by using X-ray diffraction for their textures, and ICP-OES and ion chromatograph ICS-900 for contents of their cations（K＋, Ca2_, Na＋and Mg2_） and anions（ Cl-, Br-, I-, and SO4^2-）, respectively. Results show that Br contents of samples vary from 89.08 ppm to 555.45 ppm which are higher than that of the sea water. Molar Br/Cl values of samples vary from 0. 13×10^-3 to 0. 86×10^3. Contents of Br are mainly affected by compositions of the solution（ SO4^2- , K＋ , Ca2＋ and Mg2＋） and the solution evaporation. I contents vary from 0.07^-6 to 0.27×10^-6 which are slightly higher than that of the sea water. I/Cl molar ratios vary from 0.03^-6 to 0. 1 1 ^-6. The positive relationship between I contents and I/C1 rati- os suggest that the evaporation is one of factors on the I content of the brine. However, the negative correlation between Br and I contents suggest that the content of organic matters may played more important role than the evaporation on the con- tent of I. I contents and I/Cl molar ratios of samples may be appliedto identify their continental or marine origins.