Quantification of Shock Metamorphism by Spectroscopic Measurement of Rock Forming Minerals

1. 在okeyama山的图表中发现了石英的pdf。这是山山是陨石坑的证据。在低温阴极发光（CL）图像中检测了pdf的结构。这些结果发表在2005年的地球化学杂志上。然而这篇论文被拒绝了，因为裁判认为需要更直接的结构破坏证据等等。随后，拉曼光谱测量证实了玻璃的层压结构和pdf的晶体。现在我们正准备提交另一份国际期刊。未受冲击的石英在CL光谱中表现为两步温度猝灭过程。另一方面，受到冲击的石英，如来自德国里斯陨石坑的石英，在CL光谱中表现为一步温度淬火过程。并定量估计了淬火过程的活化能。实验冲击在砂岩350℃时产生了一个新的TL峰。这个新峰的波长为380 nm，可能是由砂岩中的富钠斜长石产生的。变质砂岩的热释光峰在350℃时也有轻微凸起。这些事实表明，山山的半圆形地形特征是由超高速撞击事件形成的。而不同产地的单晶富钠斜长石（钠长石）的激波则不产生相似的峰。研究了冲击石英和冲击钠长石的ESR谱。石英中的E_1′、Ge、Al和Ti-Li中心消失。一个新的峰g=2.0044，不管它们是在激波钠长岩中产生的。这些结果表明，我们有可能用ESR定量测量冲击程度。

1. PDFs in quartz was found in the Mt. Oikeyama chart. This is evidence that Mt. Oikeyama is impact crater. The structure of PDFs was also detected in low temperature cathodoluminescence (CL) image. These results submitted in Geochemical Jour in 2005. However this paper was rejected with referee's comment that more immediate evidence of structural destruction was necessary and so on. Afterwards, Raman spectra measurement confirmed laminated structure of glass and the crystal of the PDFs. Now we are preparing to submit another international journal.2. Quartz that had not received impact showed two step temperature quenching process in CL spectra. On the other hand quartz that had received impact, such as quartz from Ries crater in Germany, showed one step temperature quenching process in CL spectra. Activation energies of the quenching process are also quantitative estimated.3. Experimental shock produced a new TL peak at 350℃ in sandstone. Sodium-rich plagioclase in sandstone may be responsible for this new peak, of which wavelength is 380 nm. TL of the metamorphic sandstone showed also a slight bulge TL peak at 350℃. It was thought that these facts imply that the semicircular topographical feature at Mt. Oikeyama was formed by hypervelocity impact event. However, shock for monocrystal sodium-rich plagioclases (albite) from different origins didn't produce the similar peak.4. The ESR spectra of shocked quartz and shocked albite were examined. E_1', Ge, Al, and the Ti-Li centers in quartz were disappeared. A new peak, g=2.0044, was generated regardless their origin in shocked albite. These results suggest that there is possibility that we can measure the shock degree quantitatively by ESR.