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作者于1983年2月,在对大吉山脉钨矿床中六号脉黑钨矿的研究中发现,黑钨矿晶体中Mn/Fe值变化是波动的,即含铁量为突变,而非渐变.后经扫描电镜、电子探针、化学分析、原子吸收光谱分折以及用粉晶X射线衍射法与光、薄片检查发现,该黑钨矿晶体具有环带构造.自根部向顶部,环带成分为:(以Fe含量计):Ⅰ峰100 Ⅱ峰46.81 Ⅲ峰91.49Ⅳ峰66.38 Ⅴ峰31.91Ⅰ′谷(界于Ⅰ、Ⅱ峰间,以下类推)21.28Ⅱ′谷8.51 1%#11Ⅲ′谷6.38 Ⅳ′谷17.02不论峰与谷,其所代表的铁含量总体变化趋势(自结晶作用早期至晚期)都是降低的,此点与整个矿体的黑钨矿化学成分变化总趋势一致,用包体测温法证明了矿物形成过程为一降温过程(自440℃至350℃).
In February 1983, in a study of the vein No. 6 in the Daji Tungsten Deposit, it was found that the variation of the Mn / Fe value in the wolframite crystal fluctuated, ie, the amount of iron was abrupt but not gradual. Scanning electron microscopy, electron probe, chemical analysis, atomic absorption spectroscopy, as well as the use of powder X-ray diffraction and light and thin film inspection found that the wolframite crystal has a ring structure from the root to the top, the zonal composition : (As Fe content): Ⅰ peak 100 Ⅱ peak 46.81 Ⅲ peak 91.49 Ⅳ peak 66.38 Ⅴ peak 31.91 Ⅰ ’valley (in the Ⅰ, Ⅱ peak between the following analogies) 21.28 Ⅱ’ Valley 8.51 1% # 11 Ⅲ ’Valley 6.38 Ⅳ ’Valley 17.02 The overall trend of iron content (from the early to the late stage of the crystallization) of both the peak and the valley decreases, which is consistent with the general trend of change of the chemical composition of the wolframite in the whole ore body. Body temperature measurement shows that the mineralization process is a cooling process (from 440 ℃ to 350 ℃).