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首页> 外文期刊>Contributions to Mineralogy and Petrology >Magmatic platinum nanoparticles in metasomatic silicate glasses and sulfides from Patagonian mantle xenoliths
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Magmatic platinum nanoparticles in metasomatic silicate glasses and sulfides from Patagonian mantle xenoliths

机译：岩浆铂纳米颗粒硅酸盐玻璃和硫化物的岩浆硅酸盐玻璃和硫化物的硅膜与巴塔哥拉山岩石Xenoliths

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Platinum-rich nanonuggets (s.l., nanoparticles) are commonly produced in experiments attempting to quantify the solubility or partitioning of noble metals in silicate and sulfide melts. However, it has been thought that these represent artifacts produced during quenching of the experimental runs. Here, we document nanoparticles (similar to 20-80nm) of Pt-rich alloys and arsenides dispersed in high-temperature metasomatic silicate glasses and in base-metal sulfides (BMS) entrained in them, found interstitially between minerals of mantle peridotite xenoliths from southern Patagonia. Pt-rich nanoparticles found in the interstitial silicate glasses are frequently attached to, or in the proximities of, oxides (ilmenite or Cr-spinel) suggesting a close link between the formation of the oxides and the Pt-rich nanoparticles. The interstitial glasses in the studied xenoliths correspond to quenched alkaline basaltic melts that infiltrated the subcontinental lithospheric mantle (SCLM) at>1000 degrees C at an oxygen fugacity (fO(2)) near the fayalite-magnetite-quartz (FMQ) buffer. Experimental works indicate that at these conditions the crystallization of oxides such as ilmenite or Cr-spinel may lower fO(2) to promote the precipitation of Pt-rich nanoparticles. The investigation of four Pt-rich nanoparticles hosted in two different pentlandite grains using a combination of focused ion beam and high-resolution transmission electron microscopy (FIB/HRTEM) show that these nanoparticles consists of polycrystalline aggregates<10nm that are randomly oriented relative to their sulfide host matrices. These observations suggest that these nanoparticles could be segregated either directly from the infiltrating alkaline basaltic melt prior to sulfur saturation in the silicate melt, or from droplets of immiscible sulfide melt once sulfur saturation was achieved. The formation of Pt-rich nanoparticles in high-temperature melts, either silicate or sulfide, provides new clues on the processes of fractionation, transport and concentration of Pt in the mantle.
机译：富含铂的纳米颗粒（S.1.，纳米颗粒）通常在试图定量硅酸盐和硫化物熔体中的惰性金属的溶解度或分配的实验中产生。然而，已经认为这些代表在淬火实验运行期间产生的伪影。在此，我们将富含Pt的合金的纳米颗粒（类似于20-80nm）和分散在其中夹带的高温硅酸盐玻璃和碱金属硫化物（BMS）中的纳米颗粒（类似于20-80nm），发现南部甲状腺橄榄石Xenoliths的矿物质间缺两种巴塔哥尼亚。在间质硅酸盐玻璃中发现的富含PT的纳米颗粒通常附着于氧化物（Ilmenite或Cr-S​​pinel）的邻近，表明氧化物的形成和富含Pt的纳米颗粒之间的紧密联系。研究中的间质玻璃对应于淬火的碱性玄武岩熔体，其在氧气抗磁性 - 石英（FMQ）缓冲液附近的氧气不足（FO（2））处渗透亚型型岩石罩（SCLM）> 1000℃。实验工作表明，在这些条件下，氧化物如ilmenite或Cr尖晶石的结晶可以降低（2）以促进富含Pt的纳米颗粒的沉淀。使用聚焦离子束和高分辨率透射电子显微镜（FIB / HRTEM）的组合的两种不同五脉粒中载入的四种富含PTLINGITE颗粒的富含PT的纳米粒子的研究表明，这些纳米颗粒由相对于其随机定向的多晶聚集体<10nm组成硫化物宿主基质。这些观察结果表明，这些纳米颗粒可以直接从硅酸盐熔融饱和之前直接从渗透碱性玄武岩熔体中进行分离，或者一旦硫饱和饱和，硫化硫醚液滴液滴。在高温熔体中形成富含PT的纳米颗粒，无论是硅酸盐还是硫化物，都提供了在地幔中Pt的分馏，运输和浓度的过程中的新线索。

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