作为金刚石矿体指示剂的雅库特含金刚石矿床锆石的光学光谱和同位素地球化学特征

A. Agashev, M. Chervyakovskaya, S. L. Votyakov, R. Zhelonkin, V. Chervyakovskiy, E. A. Pankrushina, A. L. Zemnukhov, N. Pokhilenko
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引用次数: 0

摘要

研究课题。雅库特北极地区莫洛多河和 Ebelyakh 河钻石矿床中的锆石颗粒。研究目的研究锆石的指标特征,以确定金刚石的来源及其向矿床转移的方式;分析锆石颗粒的光学光谱和同位素地球化学参数、微量元素、U-Pb 和 Lu-Hf 同位素组成。材料与方法使用带有 NWR 213 附件的 NexION 300S 质谱仪对锆石的 U-Pb 同位素和微量元素组成进行了 LA-ICP-MS 分析。使用配备 NWR 213 附件的 Neptune Plus 质谱仪对 Lu-Hf 同位素系统进行了分析,该质谱仪位于集体使用的 Geoanalitik 中心(俄罗斯科学院乌拉尔分院 IGG,叶卡捷琳堡)洁净度为 ISO 7 级的房间内。拉曼光谱使用 LabRAM HR800 Evolution 共聚焦光谱仪获得。CL 光谱使用配备 Horiba H-CLUE iHR500 附件的 Jeol JSM6390LV 扫描电子显微镜获得。结果。确定了锆石晶粒的局部光学光谱特征(拉曼光谱和阴极发光),从而可以证实其结晶度高和均匀性(单色性)的结论,并选择具有类似特征的国际锆石标准用于 LA-ICP-MS 分析,以确保物质蒸发条件以及 U 和 Pb 元素的分馏参数相似。介绍了有关金刚石矿床锆石晶粒的微杂质、U-Pb 和 Lu-Hf 同位素组成的 LA-ICPMS 数据,以及其自辐照的剂量值。结论。所获得的铀-铅年代测定有助于重建雅库特金伯利岩带内金伯利岩岩浆活动、构造过程以及金伯利岩材料和金刚石在西伯利亚陨石坑中迁移路线的更精确历史、特征和表现顺序。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Optical-spectroscopic and isotope-geochemical characteristics of zircons from diamond-bearing placers in Yakutia as indicators of diamond ore bodies
Research subject. Zircon grains from diamond placers of the Molodo and Ebelyakh rivers of the Yakut Arctic. Aim. To study the indicator characteristics of zircon to determine sources of diamonds and ways of their transfer to placers; to analyze optical-spectroscopic and isotope-geochemical parameters of zircon grains, their microelemental, U-Pb, and Lu-Hf isotope composition. Materials and methods. A LA-ICP-MS analysis of the U-Pb isotopic and trace element composition of zircon was carried out using a NexION 300S mass spectrometer with an NWR 213 attachment. An analysis of the Lu-Hf isotope system was carried out using a Neptune Plus mass spectrometer with an NWR 213 attachment, located in a room of cleanliness class 7 ISO at the Geoanalitik Center for Collective Use (IGG Ural Branch of the Russian Academy of Sciences, Ekaterinburg). Raman spectra were obtained using a LabRAM HR800 Evolution confocal spectrometer. CL spectra were obtained using a Jeol JSM6390LV scanning electron microscope equipped with a Horiba H-CLUE iHR500 attachment. Results. The local optical spectroscopic characteristics (Raman spectra and catholuminescence) of zircon grains were established, which made it possible to substantiate the conclusion about their high crystallinity and homogeneity (monochrony), as well as to select international zircon standards with similar characteristics for use in LA-ICP-MS analysis to ensure similar conditions for evaporation of the substance and fractionation parameters of the U and Pb elements. LA-ICPMS data on the microimpurity, U-Pb and Lu-Hf isotopic composition of zircon grains from diamond placers, as well as the dose values of their self-irradiation, are presented. Conclusions. The obtained U-Pb dating contributes to reconstructing a more precise history, character, and sequence of manifestation of kimberlite magmatism, tectonic processes, and migration routes of kimberlite material and diamonds across the Siberian craton, within the Yakut kimberlite province.
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