Abstract

Three hundred thirty-six diamonds from deposits of the Rassolninskaya depression and 144 crystals from recent alluvial placers of the Krasnovishersky district were studied by IR absorption and photoluminescence spectroscopy. It is shown that crystals from the Rassolninskaya depression have a close-to-normal distribution for the nitrogen concentration. The average nitrogen content is 725 ppm, and no nitrogen-free crystals were detected. A sampling from recent alluvial placers contains 25% crystals with a nitrogen concentration smaller than 150 ppm; 3% of them are nitrogen-free. Among crystals from the Rassolninskaya depression, 12% are octahedral, 80% rhombododecahedral, and only one crystal has relicts of cubic faces. The collection from recent placers contains 3% cubic crystals, 10% individuals with relicts of cubic faces, 16% octahedroids, and 66% dodecahedra. Alluvial diamonds are often encountered with crescent-shaped cracks; however, they were observed only on a single crystal from the Rassolninskaya depression. It has been revealed that among alluvial placer diamonds, up to 95% of crystals contain nitrogen in the form of B1 defects. Thus, first, in morphological and structural-mineralogical features, diamonds from the Rassolninskaya depression differ from crystals of the nearest recent alluvial placers; second, they may belong to primary deposits based on the set of their characteristics.

中文翻译：

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克拉斯诺维谢尔斯基区（乌拉尔地区）Rassolninskaya凹陷和现代冲积砂中钻石的比较

摘要

通过红外吸收和光致发光光谱研究了Rassolninskaya凹陷沉积物中的346颗钻石和Krasnovishersky地区最近的冲积砂中的144颗晶体。结果表明，来自Rassolninskaya凹陷的晶体的氮浓度具有接近于正态的分布。平均氮含量为725 ppm，未检测到无氮晶体。最近的冲积砂样品中含有25％的氮含量小于150 ppm的晶体。其中3％是无氮的。在来自Rassolninskaya凹陷的晶体中，八面体为12％，菱形十二面体为80％，只有一种晶体具有立方面遗迹。从最近的砂矿中收集的矿物质包含3％的立方晶体，10％的具有立方面遗物的个人，16％的八面体，和66％的十二面体。冲积钻石经常会遇到新月形的裂纹。但是，仅在Rassolninskaya凹陷的单晶上观察到它们。已经发现，在冲积砂岩中，高达95％的晶体含有B1缺陷形式的氮。因此，首先，在形态学和结构矿物学特征上，来自Rassolninskaya凹陷的钻石与最近的冲积砂矿的晶体不同。第二，根据它们的特征，它们可能属于原生矿床。因此，首先，在形态学和结构矿物学特征上，来自Rassolninskaya凹陷的钻石与最近的冲积砂矿的晶体不同。其次，根据它们的特征，它们可能属于原生矿床。因此，首先，在形态学和结构矿物学特征上，来自Rassolninskaya凹陷的钻石与最近的冲积砂矿的晶体不同。其次，根据它们的特征，它们可能属于原生矿床。