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在野外系统考察基础上,利用偏光显微镜、矿相显微镜、扫描电镜、X射线粉晶衍射和电子探针对福建武夷山坪地钼矿的辉钼矿进行形貌、成分和多型研究。结果表明,坪地钼矿矿石类型主要有岩体“层节理”中黄铁绢英型矿石和断裂带中角砾岩型矿石2大类。黄铁绢英岩型矿石中辉钼矿一般结晶度较高,颗粒较大,呈中粗—中细粒鳞片状,多色性明显,而断裂带角砾岩型矿石中的辉钼矿结晶较差,颗粒较小,局部多呈厚板状、带状分布,且常常弯曲。2类矿石中的辉钼矿多型主要为2H型,只是断裂带角砾岩型矿石中的个别样品局部出现3R的峰迹。本区辉钼矿相对其他地区辉钼矿的杂质含量相对较低,伴生矿产元素Re含量也较低,但2类矿石相比,断裂带角砾岩型矿石中辉钼矿的杂质含量(包括Re)较高。
Based on the field investigation, the morphologies, compositions and polytypes of molybdenite deposits in the Shanping molybdenum mine of Wuyi, Fujian Province were studied by means of polarized light microscope, optical microscope, scanning electron microscope, X-ray powder diffraction and electronic probe. The results show that there are two main types of ores in Pingdi molybdenum ore: yellow iron siliceous ore in the “layer joint” and breccia type ore in the fault zone. The molybdenite in pyrite sericite ore generally has a higher degree of crystallinity, a larger particle size, a medium-coarse-grained scale-scale flake, and a high degree of pleochroism. However, the molybdenite crystals in the brecciated breccia ore are poorly crystalline , Smaller particles, local mostly thick plate, ribbon distribution, and often curved. The molybdenite type 2 ore is mainly 2H in type 2 ore, but the 3R peak appears locally in some samples of breccia type ore. The molybdenite in this area is relatively lower in impurity content than the molybdenite in other areas, and the content of associated mineral element Re is also low. However, the impurity content of molybdenite in breccia type ore (including Re) higher.