新康海泡石富镁特征的研究

新康海泡石中MgO含量高达26％左右,明显高于广济、全椒、浏阳及国外海泡石中MgO的含量。Ms~(2+)占据全部八面体位置后,仍有0.133-0.318的镁离子剩余。新康海泡石是富镁海泡石变种?还是混有少量蛇纹石或是有其它富镁杂质?我们通过人工配比混合样及不同产地海泡石的X射线衍射分析,配合热处理样品X射线分析,以及物理性能测试研究,证实新康海泡石是富镁海泡石变种,结晶度差,但热稳定性高,比表面和阳离子交换容量均较大。海泡石中MgO的含量与其成矿地质条件有关,新康富镁海泡石是产于超镁铁质岩型蛇纹岩体风化带裂隙中的次生矿物,成矿母岩的富镁低钙特征是生成富镁海泡石的基本条件。

Study on Characteristics of S epiolite with Rich Magnesium of Xinkang, Sichuan

The MgO content of xinkang sepiolite comes up to 26% which is higher than that of other mines' sepiolite sample. Why so? The sepiolite samples come from different mines have been comparatively studied by XRD including mixure samples with different ratio and heat-treated samples under different temperature, and by test of physical properties. It is to be confirmed that the higher MgO content did not come from impurities, Xinkang sepiolite is a Mg-rich variety which is related to the host rock-serpentinite.