山东昌乐县北岩地区玄武岩中铁尖晶石矿物学特征研究

Mineralogical Characteristics of Fe-spinel in Basalt in Beiyan Region, Changle County, Shandong

论文对山东潍坊市昌乐县北岩镇产出的尖晶石进行了基本特征、成分特征和红外光谱分析。研究发现此地产出的尖晶石,颗粒较大,多呈粒状,颜色主要为褐黑色,透明度较差,晶体可见不完全的八面体晶型,解理不发育、折射率大于1.78,相对密度(3.7~3.9)g/cm^3,明显大于镁尖晶石。化学成分以Al2O3,MgO以及FeO为主,经过计算,该地尖晶石为Fe尖晶石;通过红外光谱测试可知,694cm^-1和1023cm^-1附近的两个吸收峰为该尖晶石的特征吸收峰。通过对比前人对此地尖晶石的研究可知,论文研究尖晶石可能为早期刚玉经过多期次作用形成的产物。

This paper analyses the basic characteristics, composition characteristics and infrared spectra of spinel from Beiyan region, Changle County, Weifang City, Shandong Province. The results show that the spinel produced in this area is large, mostly granular, mainly brown-black in color, poor transparency, incomplete octahedral crystal, cleavage undeveloped, refractive index greater than 1.78, density 3.7-3.9 g/cm^3, apparently larger than magnesia spinel. The chemical composition of spinel is mainly Al2O3, MgO and FeO. By calculation, the geospinel is iron spinel. According to the infrared spectrum test, the two absorption peaks near 694 cm^-1 and 1023 cm^-1 are the characteristic absorption peaks of the spinel. By comparing with the previous studies on geospinel, it can be seen that the spinel may be the product of early corundum formed by multiple stages.