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Quantification of Shock Metamorphism by Spectroscopic Measurement of Rock Forming Minerals

通过成岩矿物的光谱测量量化冲击变质作用

基本信息

批准号：
17540399
负责人：
KIYOTAKA Ninagawa
金额：
$ 2.41万
依托单位：
Okayama University of Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

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.

1. PDF在石英被发现在山。大池山图。这是一个证据，Mt。大池山是撞击坑。在低温阴极发光（CL）图像中也检测到PDF的结构。2005年发表在《地球化学杂志》上。然而，这篇论文被驳回与裁判的意见，更直接的证据，结构破坏是必要的等等。之后，拉曼光谱测量证实了玻璃的层压结构和晶体的PDF。现在我们正准备提交另一份国际期刊。未受到冲击的石英在化学发光光谱中表现出两步温度猝灭过程。另一方面，石英受到冲击，如石英里斯陨石坑在德国，显示一个步骤的温度淬火过程中的CL光谱。并对淬火过程的活化能进行了定量估算.实验冲击在砂岩中产生了一个新的热释光峰，温度为350℃。砂岩中的富钠斜长石可能是产生这一新峰的原因，其波长为380 nm。变质砂岩的热释光在350℃时也有一个轻微隆起的热释光峰。据认为，这些事实意味着，半圆形的地形特征在山。大池山是由超高速撞击事件形成的。而不同成因的富钠斜长石（钠长石）单晶在冲击波作用下没有出现相似的峰值.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。一个新的峰值，g=2.0044，无论它们的起源在冲击钠长石。这些结果表明，我们有可能用ESR定量测量冲击程度。