The quartz-cristobalite transformation in heated chert rock composed of micro and crypto-quartz by Micro-Raman and FT-IR spectroscopy methods
The quartz-cristobalite transformation in heated chert rock composed of micro and crypto-quartz by Micro-Raman and FT-IR spectroscopy methods
复制标题
用显微拉曼和傅立叶变换红外光谱方法研究由微石英和隐石英组成的加热燧石中的石英-方石英转变
DOI：
10.1007/bf01979562
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
G. Panczer
中科院分区：
文献类型：
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作者：
S. Shoval;B. Champagnon;G. Panczer
利用显微拉曼光谱、傅里叶变换红外光谱、X射线衍射和扫描电子显微镜研究了天然燧石（燧石）中石英-方石英在1000-1300°C温度区间的转变。硅质岩在1000°C加热1 h后首先观察到少量的石英晶体，在1300°C加热24 h后，石英晶体的转变基本完成。另一方面，在相同条件下加热后，在结晶良好的纯石英中未检测到方石英。这种转变发生在高温下方石英取代石英的固态成核和晶体生长。燧石岩天然富含晶体缺陷和边界，这些缺陷和边界可作为成核位点，并使石英-方英石能够更早地转化。
The quartz-cristobalite transformation in heated natural chert (flint) rock composed of micro- and ŗypto-quartz was investigated in the temperature interval of 1000–1300°C by micro-Raman spectroscopy, FT-IR spectroscopy, X-ray diffraction and Scanning Electron Microscopy. A small amount of crystobalite was first observed in the chert after heating at 1000°C for 1 h and the transformation was almost completed after heating at 1300°C for 24 h. On the other hand, cristobalite was not detected in well-crystallized pure quartz after heating under the same conditions. The transformation occurs as a solid state nucleation and crystal growth of cristobalite replacing quartz at high-temperatures. The chert rock is naturally rich in crystal defects and boundaries which serve as nucleation sites and enable an earlier quartz-cristobalite transformation.