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Spectroscopic evidence of the origin of brown and pink diamonds family from Internatsionalnaya kimberlite pipe (Siberian craton)
Physics and Chemistry of Minerals ( IF 1.4 ) Pub Date : 2020-03-07 , DOI: 10.1007/s00269-020-01088-5
Olga P. Yuryeva , Mariana I. Rakhmanova , Dmitry A. Zedgenizov , Viktoria V. Kalinina

New spectroscopic data were obtained to distinguish the specific features of brown and pink diamonds from Internatsionalnaya kimberlite pipe (Siberian craton). It is shown that pink and brown samples differ markedly in the content and degree of aggregation of nitrogen defects. Pink diamonds generally have higher nitrogen content and a lower aggregation state compared to brown samples, which often show significant variations in nitrogen content and aggregation state between different growth zones. The 491 and 576 nm luminescent centres, which are signs of deformed brown diamonds, are absent or of low intensity in pink diamonds implying that high nitrogen content predominantly in A form in the pink diamonds had stiffened the diamonds against natural plastic deformation. The GR1 centre, formed by a neutrally charged vacancy, was observed only in pink diamonds, which may be due to their formation and storage in the mantle at lower-temperature conditions. Mineral inclusions indicate peridotitic and eclogitic paragenesis for studied brown and pink diamonds, respectively. It is suggested that brown diamonds have been formed in a primitive mantle at higher temperatures and/or stored there much longer.

中文翻译:

来自国际金伯利岩管(西伯利亚克拉通)的棕色和粉红色钻石家族起源的光谱证据

获得了新的光谱数据,以区分来自国际金伯利岩管(西伯利亚克拉通)的棕色和粉红色钻石的具体特征。结果表明,粉红色和棕色样品在氮缺陷的含量和聚集程度方面存在显着差异。与棕色样品相比,粉红色钻石通常具有较高的氮含量和较低的聚集状态,这通常在不同生长区域之间显示出显着的氮含量和聚集状态。491 和 576 nm 发光中心是变形棕色钻石的标志,在粉红色钻石中不存在或强度较低,这意味着粉红色钻石中主要以 A 型形式存在的高氮含量使钻石变硬,抵抗自然塑性变形。GR1 中心由带中性电荷的空位形成,仅在粉红色钻石中观察到,这可能是由于它们在较低温度条件下形成和储存在地幔中。矿物包裹体分别表明所研究的棕色和粉红色钻石的橄榄岩和榴辉岩共生作用。有人认为棕色钻石是在较高温度下在原始地幔中形成和/或在那里储存的时间更长。
更新日期:2020-03-07
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