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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Inclusions in diamonds constrain thermo-chemical conditions during Mesozoic metasomatism of the Kaapvaal cratonic mantle
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Inclusions in diamonds constrain thermo-chemical conditions during Mesozoic metasomatism of the Kaapvaal cratonic mantle

机译：钻石中的夹杂物在Kaapvaal Cratonic Mantle的中生代型偏索术期间约束热化学条件

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摘要

Fluid/melt inclusions in diamonds, which were encapsulated during a metasomatic event and over a short period of time, are isolated from their surrounding mantle, offering the opportunity to constrain changes in the sub-continental lithospheric mantle (SCLM) that occurred during individual thermochemical events, as well as the composition of the fluids involved and their sources. We have analyzed a suite of 8 microinclusion-bearing diamonds from the Group I De Beers Pool kimberlites, South Africa, using FTIR, EPMA and LA-ICP-MS. Seven of the diamonds trapped incompatible-element-enriched saline high density fluids (HDFs), carry peridotitic mineral microinclusions, and substitutional nitrogen almost exclusively in A-centers. This low-aggregation state of nitrogen indicates a short mantle residence times and/or low mantle ambient temperature for these diamonds. A short residence time is favored because, elevated thermal conditions prevailed in the South African lithosphere during and following the Karoo flood basalt volcanism at similar to 180 Ma, thus the saline metasomatism must have occurred close to the time of kimberlite eruptions at similar to 85 Ma. Another diamond encapsulated incompatible-element-enriched silicic HDFs and has 25% of its nitrogen content residing in B-centers, implying formation during an earlier and different metasomatic event that likely relates to the Karoo magmatism at ca. 180 Ma.
机译：钻石中的液体/熔体夹杂物在代置的事件和短时间内封装，它们与周围的地幔隔离，提供了机会限制在各个热化学中发生的亚大陆岩石罩（SCLM）的变化事件，以及所涉及的流体的组成及其来源。我们分析了一系列来自啤酒池Kimberlites，南非，使用FTIR，EPMA和LA-ICP-MS的啤酒池Kimberlites的套房。七种钻石捕获了不相容的元素富含元素的盐水高密度流体（HDF），携带橄榄石矿物质微型条件，几乎完全在一个中心中的取代氮。这种低聚集状态的氮气表明这些钻石的短地幔停留时间和/或低地幔环境温度。一个短暂的住宿时间受到青睐，因为在类似于180 mA的卡卢洪水玄武岩中和南非岩石岩层中普遍存在的热情普遍存在，因此盐水弥扑术必须接近金伯利爆发的时间与85 mA相似。 。另一种金刚石包封了富含元素的富含元素的硅HDF，其居住在B中心的25％的氮气含量，暗示在较早的和不同的代表性事件中形成的形成，这可能与CA karoo Magmatism有关。 180 mA。

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