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墨铜矿是由硫化物层(S层)和氢氧化物层(H层)沿c方向交替排列而成,其特殊的层状结构可代表一系列类似矿物的结构特点.墨铜矿的超晶胞结构模型最初由Evans和All-mann于1968年建立,其后,为数不多的文献在承认该结构模型基础上,从组成、选矿、人工合成及类似物相等方面进行了研究.近来将其作为一种新类型的间层矿物来研究,也取得了一些新的认识.本文对采自河北寿王坟、涞源和甘肃金川3个铜矿床的墨铜矿样品进行了电子探针、X射线和M(?)ssbuer谱测量,对寿王坟样品还进行了透射电子显微镜观察.1 实验结果与讨论1.1 电子探针分析25个测点的探针分析结果表明:(1)主量元素为Fe,Cu,S和Mg,含微量Al;(2)不同产地、不同样品及不同测点的探针成分均变化较大;(3)计算的晶体化学式中n值(表示S和H层的失配程度)偏离理想值较大.化学组成的不稳定性是墨铜矿的一个显著的特点,表明结构基元层局部堆垛较不均匀,或在层平面上S层和H层的失配度较高.1.2 穆斯堡尔谱分析根据M(?)ssbuer谱的测量和分析,我们认为高自旋的Fe~(2+)占据S层四面体位置,且配位化学环境不完全等同,谱参数为IS=0.42～0.48mm/s,QS=0.81～1.28mm/s,H_i约为24T;低自旋的Fe~(3+)占据H层八面体位置,IS=0.32～0.36mm/s,QS=0.44～0.59mm/s;可能弛豫作用造成磁?
The copper deposit is composed of sulfide layers (S layer) and hydroxide layer (H layer) alternately arranged along the c direction, and its special layered structure can represent a series of structural features similar to minerals. The unit cell structure model was originally established by Evans and All-mann in 1968, and since then few papers have examined compositional, mineral processing, synthetic, and analogue equivalents based on the recognition of this structural model. Recently, As a new type of interlaminar minerals, some new understandings have also been obtained.In this paper, the samples of two different copper deposits collected from Shouwangfen, Shiyuan and Jinchuan, Gansu, , X-ray and M (?) Ssbuer spectroscopy, and Shouwangfen samples were also observed by transmission electron microscopy.1 Experimental results and discussion 1.1 Electron probe analysis The probe results of 25 measuring points showed that: (1) The main The amount of elements of Fe, Cu, S and Mg, with trace amounts of Al; (2) different origin, different samples and different measuring points probe components vary greatly; (3) calculated crystallographic formula n value The degree of mismatch in the H layer deviates from the ideal value. The instability of the chemical composition is a significant Point, indicating that the local stacking of structural primitives is not uniform, or the mismatch between the S and H layers is high in the layer plane.1.2 Mossbauer analysis According to the measurement and analysis of M (?) Ssbuer spectrum, We believe that the highly spinned Fe 2+ occupies the tetrahedral position of the S layer and the coordination chemical environment is not completely identical. The spectral parameters are IS = 0.42-0.48 mm / s, QS = 0.81-1.28 mm / s, and H_i is about 24T; the low spin Fe 3+ occupies the octahedral position of H layer, IS = 0.32-0.36mm / s, QS = 0.44-0.59mm / s;