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谢尔戈蒂石中的一个单临床后stishovite多态
El Goresy A1, Dubrovinsky, Sharp
1Max-Planck-Institut fur Chemie, J.-Becher-Weg 27, D-55128 Mainz, Germany. Theoretical Geochemistry Program, Institute of Earth Sciences, Uppsala University, S-75236, Uppsala, Sweden. Department of Geology, Arizona State University, Tempe, A.
概括
研究人员在Shergotty石中发现了一个新的stishovite后的石阶段. 这一发现为在外星冲击事件中形成的高压二氧化多态物提供了新的见解.
科学领域:
- 矿物学是一门学科.
- 行星科学 行星科学
- 材料科学 材料科学 材料科学
背景情况:
- 石为了解行星过程提供了重要的样本.
- 呈现出各种高压多态,包括stishovite.
- 冲击事件可以诱导石中的极端压力和温度条件.
研究的目的:
- 为了识别和描述Shergotty石中的高压二氧化相.
- 为了研究由冲击事件引起的矿物质变化.
主要方法:
- 用于晶体分析的X射线衍射 (XRD).
- 场辐射扫描电子显微镜 (FESEM) 用于微观结构的研究.
- 传输电子显微镜 (TEM) 用于详细的相位识别.
主要成果:
- 识别一个后stishovite的二氧化阶段与一个单一的晶格.
- 新阶段的单元细胞参数和密度的表征.
- 在同一颗二氧化颗粒中观察到stishovite和cristobalite,表明多个高密度的多态.
结论:
- 谢尔戈蒂石中含有一种以前未被识别的石灰多态物.
- 存在多个高密度二氧化相表明,在冲击变形过程中发生复杂的转变.
- 这一发现有助于我们了解在极端外星条件下的行为.
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