Source assemblage types for cratonic diamonds from X-ray synchrotron diffraction

Source assemblage types for cratonic diamonds from X-ray synchrotron diffraction
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X 射线同步加速器衍射中克拉通钻石的源组合类型

DOI:
10.1016/j.lithos.2016.07.037
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发表时间:
2016
期刊:
影响因子:
3.5
通讯作者:
J.W. Harris
J.W. Harris
中科院分区:
地球科学2区
文献类型:
--
作者:
F. Nestola;M. Alvaro;M.N. Casati;H. Wilhelm;A.K. Kleppe;A.P. Jephcoat;M.C. Domeneghetti;J.W. Harris

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利用单晶同步辐射X射线衍射技术对产自俄罗斯西伯利亚Udachnaya金伯利岩的三种不同宝石级金刚石中的三种单斜辉石单晶进行了原位分析,以获得其化学成分信息并推断其来源组合类型。在金刚石光源的极端条件光束线I15处使用高能量(1060 keV; λ 10.206 μ m)的非破坏性方法。一个专门的协议被用来集中位于X射线束中的钻石内部深处的矿物包裹体。我们的研究结果表明,两个包体可以与橄榄岩共生,而第三个是榴辉岩。这项研究还表明,这种非破坏性的实验方法在评估被困在钻石宿主中的矿物的来源方面非常有效。
Three single crystals of clinopyroxene trapped within three different gem-quality diamonds from the Udachnaya kimberlite (Siberia, Russia) were analysedin situby single-crystal synchrotron X-ray diffraction in order to obtain information on their chemical composition and infer source assemblage type. A non-destructive approach was used with high-energy (≈ 60 keV; λ ≈ 0.206 Å) at I15, the extreme-conditions beamline at Diamond Light Source. A dedicated protocol was used to center the mineral inclusions located deep inside the diamonds in the X-ray beam. Our results reveal that two of the inclusions can be associated with peridotitic paragenesis whereas the third is eclogitic. This study also demonstrates that this non-destructive experimental approach is extremely efficient in evaluating the origin of minerals trapped in their diamond hosts.
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