Quantification of Shock Metamorphism by Spectroscopic Measurement of Rock Forming Minerals

1.在山上发现了石英中的PDF。Oikeyama图表。这是山上的证据。尾山是撞击坑。低温阴极发光(CL)图像也检测到了PDF的结构。这些结果于2005年发表在《地球化学周刊》上。然而，这篇论文被驳回了，因为裁判评论说，更直接的结构破坏证据是必要的，等等。随后，拉曼光谱测量证实了玻璃的层状结构和PDF的晶体。现在我们正在准备提交另一份国际期刊。未受冲击的石英在化学发光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，如德国Ries陨石坑的石英，在化学发光光谱中显示出一步温度猝灭过程。对猝灭过程的激活能也进行了定量估算。实验冲击在砂岩中的350℃处产生了一个新的热释光峰。砂岩中的富钠斜长石可能是这一新的峰的原因，其波长为380 nm。变质砂岩的热释光在350℃处也表现出轻微的隆起热释光峰。人们认为，这些事实表明，马鞍山的半圆形地形特征。尾山是由超高速撞击事件形成的。然而，对不同来源的单晶富钠斜长石(钠长石)的冲击并没有产生相似的峰值。研究了受冲击石英和受冲击钠长石的ESR谱。石英中的E_1‘、Ge、Al和Ti-Li中心消失。无论其来源如何，都产生了一个新的峰值，g=2.0044。这些结果表明，用ESR定量测量冲击程度是有可能的。

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.