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Enigmatic Alluvial Sapphires from the Orosmayo Region, Jujuy Province, Northwest Argentina: Insights into Their Origin from in situ Oxygen Isotopes

机译：来自奥罗斯马杜地区的神秘的冲积蓝宝石，Jujuy省，西北阿根廷：从原地氧同位素洞察起源

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This study sought to investigate in situ oxygen isotopes (δ18O) within alluvial colorless-white to blue sapphires from the Orosmayo region, Jujuy Province, NW Argentina, in order to provide additional constraints on their origin and most likely primary geological environment. Analyses were conducted using the in situ SIMS oxygen isotope technique on the same grains that were analyzed for their mineral inclusions and major and trace element geochemistry using EMPA and LA−ICP−MS methods in our previous study. Results show a significant range in δ18O across the suite, from +4.1‰ to +11.2‰. Additionally, akin to their trace element chemistry, there is significant variation in δ18O within individual grains, reaching a maximum of 1.6‰. Both the previous analyses and δ18O results from this study suggest that these sapphires crystallized within the lower crust regime, involving a complex interplay of mantle-derived lamprophyres and carbonatites with crustal felsic rocks and both mantle- and crustal-derived metasomatic fluids. This study reinforces the importance of the in situ analysis of gem corundums, due to potential significant variation in major and trace element chemistry and ratios and even oxygen isotope ratios within discrete zones in individual grains.
机译：本研究试图在奥斯科莫地区，NW阿根廷的奥萨斯马州地区举行的对抗氧同位素（δ18O），以向NW阿根廷省枣树，以为其起源和最有可能的原始地质环境提供额外的限制。在我们以前的研究中使用EMPA和LA-ICP-MS方法对其矿物质夹杂物和主要和微量元素地球化学进行分析的相同晶粒进行分析。结果在整个套件上显示Δ18O的显着范围，从+ 4.1°+到+ 11.2‰。另外，类似于它们的微量元素化学，各种晶粒内的δ18O具有显着变化，最大为1.6‰。本研究的先前分析和δ18O结果表明，这些蓝宝石在较低的地壳状态下结晶，涉及披着裂缝型叶片和碳酸石的复杂相互作用，与地壳肠岩和搭配地壳和地壳衍生的态烃。该研究由于主要和微量元素化学和比率潜在的显着变化，增强了GEM刚玉的原位分析的重要性，并且在个体颗粒中离散区内的离散区内的潜在显着变化，甚至是氧同位素比。

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