We report the results of the complex study of the bulk interior of Bursa L6 ordinary chondrite using optical microscopy, scanning electron microscopy with energy dispersive spectroscopy, electron microprobe analysis (EMPA), X‐ray diffraction (XRD), magnetization measurements, and Mössbauer spectroscopy. The main and minor iron‐bearing phases and their chemical compositions were determined by these techniques. The detected iron‐bearing phases in the bulk interior of Bursa L6 are the following: olivine; orthopyroxene; Ca‐rich clinopyroxene; troilite; chromite; hercynite; ilmenite; the α₂‐Fe(Ni, Co), α‐Fe(Ni, Co), and γ‐Fe(Ni, Co) phases; and ferrihydrite resulting from meteorite terrestrial weathering. Using the EMPA, the values of fayalite and ferrosilite were obtained as ~25.2% and ~21.4%, respectively. The unit cell parameters for silicate crystals were determined from XRD, then the Fe²⁺ and Mg²⁺ occupations of the M1 and M2 sites in these crystals were estimated. Further calculations of the ratios of the Fe²⁺ occupancies in the M1 and M2 sites in olivine and orthopyroxene based on XRD and Mössbauer spectroscopy appeared to be in a good agreement. The temperatures of equilibrium cation distributions for olivine and orthopyroxene obtained from these techniques are consistent: 623 K (XRD) and 625 K (Mössbauer spectroscopy) for olivine and 1138 K (XRD) and 1122 K (Mössbauer spectroscopy) for orthopyroxene.

中文翻译：

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X射线衍射，磁化强度测量和Mössbauer光谱研究Bursa L6普通球粒陨石

我们使用光学显微镜，能量分散光谱，电子探针分析（EMPA），X射线衍射（XRD），磁化强度测量和Mössbauer光谱报告布尔萨L6普通球粒陨石内部的复杂研究结果。通过这些技术确定了主要和次要的含铁相及其化学成分。在布尔萨L6散装内部检测到的含铁相如下：橄榄石；邻二甲苯 富钙的次氯环己烯; 三叶草 铬铁矿; 海藻土 钛铁矿 的α ₂-Fe（Ni，Co），α-Fe（Ni，Co）和γ-Fe（Ni，Co）相; 和陨石陆地风化产生的水铁矿。使用EMPA，铁橄榄石和硅铁矿的值分别为〜25.2％和〜21.4％。从XRD确定硅酸盐晶体的晶胞参数，然后估算这些晶体中M1和M2位的Fe ²⁺和Mg ²⁺占有率。Fe ²⁺的比例的进一步计算基于X射线衍射和Mössbauer光谱学，橄榄石和邻二甲苯中M1和M2的位点似乎很吻合。从这些技术获得的橄榄石和邻二甲苯的平衡阳离子分布的温度是一致的：橄榄石为623 K（XRD）和625 K（穆斯堡尔光谱），邻二甲苯为1138 K（XRD）和1122 K（穆斯堡尔光谱）。