遵义松林陡山沱组含磷岩系中泻利盐矿物的矿物学特征与成因

Mineralogy Characteristicsand Genesis of Epsomite from Doushantuo Formation Phosphorus-bearing Rock Series, Songlin Town, Zunyi County, Guizhou Province, China

遵义松林含磷岩系层理缝和节理缝内的白色矿物集合体呈粉末状、姜状和晶须状产出。作者利用X射线衍射(XRD)、扫描电镜及能谱(SED)对其进行测试分析,确定该矿物为泻利盐,化学式为Mg SO4·7H2O,扫描电镜下呈晶须状、姜状等不同形态,经计算,其晶胞参数与理想值存在较小差异。泻利盐的形成可能与含磷岩系遭受的风化作用、淋滤作用和蒸发-结晶作用有关,原岩为其提供重要的物质来源。

A white mineral were found in the surface of phosphorus-bearing rock series appeared as aggregating powder and ginger shaped whisker in Songlin area, Guizhou Province, China. By using X ray diffraction （XRD）, scanning electron microscopy energy spectrum analysis （SED） , it was determined as epsomite, with chemical formula MgSO4＇7H20. Epsomiteis whisker and ginger shape under the scanning electron microscope, andthere is little difference between the unit cell parameters and the ideal value. The original rocks provide important material sources for epsomite, whose forms may be suffered from weathering, leaching and evaporation-crystallization of phosphate rocks.