...
  • 主题
高级搜索  >
历史搜索 清空历史
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 >Cathodoluminescence, electron microscopy, and Raman spectroscopy of experimentally shock-metamorphosed zircon
【24h】

Cathodoluminescence, electron microscopy, and Raman spectroscopy of experimentally shock-metamorphosed zircon

机译：冲击变质锆石的阴极发光，电子显微镜和拉曼光谱

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Thorough understanding of the shock metamorphic signatures of zircon could be the basis for the use of this mineral as a powerful tool for the study of old, deeply eroded, and metamorphically overprinted impact structures and formations. This study of the cathodoluminescence (CL) and Raman spectroscopic signatures of experimentally (20-60 GPa) shock-metamorphosed zircon single crystals contributes to the understanding of high-pressure microdeformation in zircon. For all samples, an inverse relationship between the brightness of the backscattered electron (BSE) signal and the corresponding cathodoluminescence intensity was observed. The unshocked sample shows crosscutting, irregular fractures. The 20 GPa sample displays some kind of mosaic texture of CL brighter and darker domains, but does not exhibit any shock metamorphic features in BSE or CL images. The 40 GPa sample shows a high density of lamellar features, which might be explained by the phase transformation between zircon- and scheelite-structure phases of zircon and resulting differences in the energy levels of the activator elements. The CL spectra of unshocked and shocked (20, 40, and 60 GPa) zircon samples are dominated by narrow emission lines and broad bands in the region of visible light and in the near-UV range. The emission lines result from are earth element activators and the broad bands might be associated with lattice defects. Raman spectra revealed that the unshocked and 20 GPa samples represent zircon-structure material, whereas the 40 GPa sample yielded additional peaks with relatively high peak intensities, which are indicative of the presence of the scheelite-type high-pressure phase. The 60 GPa sample has a Raman signature that is similar to that of an amorphous phase, in contrast to the observations of an earlier TEM study that the crystalline scheelite-structure phase is stable at this shock pressure. The 60 GPa Raman signature cannot be explained at this stage. The results show a clear dependence of the CL and Raman properties of zircon on shock pressure, which confirm the possible usage of these methods as shock indicators.
机译：对锆石的冲击变质特征有透彻的了解，可以作为使用这种矿物作为研究旧的，深腐蚀的，变质的，叠印的冲击构造和构造的有力工具的基础。这项实验（20-60 GPa）冲击变质锆石单晶的阴极发光（CL）和拉曼光谱特征的研究有助于理解锆石中的高压微形变。对于所有样品，观察到反向散射电子（BSE）信号的亮度与相应的阴极发光强度之间呈反比关系。未震动的样品显示出横切，不规则的裂缝。 20 GPa样本显示CL较亮和较暗域的某种马赛克纹理，但在BSE或CL图像中未表现出任何冲击变质特征。 40 GPa样品显示出高密度的层状特征，这可以用锆石的锆石和白钨矿结构相之间的相变以及活化剂元素能级的差异来解释。未震动和震动（20 GPa，40 GPa和60 GPa）锆石样品的CL光谱主要由可见光范围内和近紫外线范围内的窄发射线和宽谱带决定。发射线是由土元素活化剂产生的，宽带可能与晶格缺陷有关。拉曼光谱显示未震荡的样品和20 GPa的样品代表了锆石结构材料，而40 GPa的样品产生了具有相对较高峰强度的其他峰，这表明存在白钨矿型高压相。 60 GPa样品具有类似于非晶相的拉曼特征，这与早期TEM研究的观察结果相反，结晶白钨矿结构相在此冲击压力下是稳定的。在此阶段无法解释60 GPa拉曼签名。结果表明，锆石的CL和拉曼特性对冲击压力有明显的依赖性，这证实了这些方法可能用作冲击指示剂。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号