中文摘要：

笔者对辽宁后仙峪硼矿床中电气石的矿物学特征和化学成分特征进行了分析．探讨了电气石化学成分对成岩成矿的指示意义。本区电气石属于镁电气石-铁电气石系列。其Mg／Fe与硼酸盐矿体有着密切的时空关系。不同产状中电气石的颜色、粒度、形态和环带特征都有明显的差别。靠近硼酸盐矿体的电气石环带各环圈都较为富Mg。从中心到边缘Mg总体有降低的趋势；远离硼酸盐矿体的各环圈都较富Fe。从中心到边缘Fe总体上有降低的趋势。电气石含量上盘总体上较下盘高，电英岩主要出现在硼酸盐矿体附近．Mg／Fe在远离硼酸盐矿体的电气石中与Na2O呈明显的正相关关系。电气石的上述化学成分特征反映了成岩成矿过程中流体演化的特点．早期的电气石是沉积物中富B部分经交代作用而成。在蒸发盆地的演化过程中，流体中Mg、Na、K成分增加，造成Mg／Fe的分带现象。电气石的所有矿物和化学特征表明电气石的形成方式包括沉积变质成因和热液交代两种．电气石的形成与硼酸盐的沉积过程密切相关．

英文摘要：

The mineralogical and chemical characteristics of tourmaline in the Houxianyu boron deposit, Liaoning, are analyzed and their significance for the formation of rocks and deposits is discussed. The tourmaline in the study area belongs to the magnesium tourmaline-iron tourmaline series （schorl-dravite solid solution series） and its Mg/Fe has close spatial and temporal relations to borate orebodies. Tourmalines with different modes of occurrence show marked differences in color, size, shape and zonal features. The content of Mg is quite high in all zones of tourmaline near the borate orebodies and has a general trend of decrease from the center to edges, whereas the iron content is quite high in all zones of tourmaline far away from the borate orebodies and has a general trend of decrease from the center to edges. The tourmaline content is generally higher in the hanging wall than in the footwaU. Tourmalinite mainly appears near borate orebodies and there is a pronounced positive correlation between Mg/Fe and Na2O in tourmalines far from the borate orebodies. The above-mentioned chemical characteristics of tourmaline reflect the features of the evolution of fluids during the formation of rocks and deposits. The older tourmalines formed by metasomatism of the boron-rich part in sediments. During the evolution of the evaporite basin, the contents of Mg, Na and K in fluids increased, which induced zoning of Mg/ Fe. All the mineralogical and chemical characteristics of tourmaline indicate that tourmalines are of metamorphosed sedimentary origin and hydrothermal metasomatic origin and that the formation of tourmalines is closely related to the deposition of borate.