Time-resolved diffraction of shock-released SiO(2) and diaplectic glass formation.
Time-resolved diffraction of shock-released SiO(2) and diaplectic glass formation.
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DOI：
10.1038/s41467-017-01791-y
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发表时间：
2017-11-14
影响因子：
16.6
通讯作者：
Mao WL
中科院分区：
文献类型：
--
作者：
Gleason AE;Bolme CA;Lee HJ;Nagler B;Galtier E;Kraus RG;Sandberg R;Yang W;Langenhorst F;Mao WL
了解形成岩石的矿物在冲击载荷下如何转变，对于模拟行星间的碰撞、解释矿物中冲击特征的重要性以及将它们用作冲击条件(如冲击压力)的诊断指标至关重要。到目前为止，我们对受冲击材料所经历的形成过程的理解完全基于对回收样品的非原位分析。因此，通常观察到的中尺度物质特征的形成机制和起源，如斜熔(即冲击)玻璃，仍然存在争议和无法解决的问题。在这里，我们展示了原位泵浦-探测X射线衍射测量，熔融二氧化硅在冲击压缩时结晶成辉钛矿，然后在冲击释放时转变为无定形相，仅在2.4 ns内从33.6GPa.回收的玻璃碎片表明是永久致密的。这些对闪辉玻璃形成的实时观察证明，它是辉石的反转产物，对修正传统的冲击变质阶段具有重要意义。我们对激波变质作用的理解，以及因此对行星体碰撞的理解，受到非原位分析的限制。在这里，作者对冲击生产的致密玻璃进行了现场分析，并表明基于传统技术的冲击器大小估计可能被夸大了。
Understanding how rock-forming minerals transform under shock loading is critical for modeling collisions between planetary bodies, interpreting the significance of shock features in minerals and for using them as diagnostic indicators of impact conditions, such as shock pressure. To date, our understanding of the formation processes experienced by shocked materials is based exclusively on ex situ analyses of recovered samples. Formation mechanisms and origins of commonly observed mesoscale material features, such as diaplectic (i.e., shocked) glass, remain therefore controversial and unresolvable. Here we show in situ pump-probe X-ray diffraction measurements on fused silica crystallizing to stishovite on shock compression and then converting to an amorphous phase on shock release in only 2.4 ns from 33.6 GPa. Recovered glass fragments suggest permanent densification. These observations of real-time diaplectic glass formation attest that it is a back-transformation product of stishovite with implications for revising traditional shock metamorphism stages. Our understanding of shock metamorphism and thus the collision of planetary bodies is limited by a dependence on ex situ analyses. Here, the authors perform in situ analysis on shocked-produced densified glass and show that estimates of impactor size based on traditional techniques are likely inflated.
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影响因子：
2.5
作者：
Nagler B;Arnold B;Bouchard G;Boyce RF;Boyce RM;Callen A;Campell M;Curiel R;Galtier E;Garofoli J;Granados E;Hastings J;Hays G;Heimann P;Lee RW;Milathianaki D;Plummer L;Schropp A;Wallace A;Welch M;White W;Xing Z;Yin J;Young J;Zastrau U;Lee HJ
通讯作者：
Lee HJ
影响因子：
5.2
作者：
Akins, JA;Ahrens, TJ
通讯作者：
Ahrens, TJ
影响因子：
4.8
作者：
Kraus, R. G.;Stewart, S. T.;Tosca, N. J.
通讯作者：
Tosca, N. J.
影响因子：
3.9
作者：
Luo, SN;Ahrens, TJ;Asimow, PD
通讯作者：
Asimow, PD
影响因子：
3.2
作者：
Manghnani, Murli H.;Hushur, Anwar;Williams, Quentin
通讯作者：
Williams, Quentin