The Raman spectroscopy of the carbonaceous materials and its applications, the Nengkuo Pass of the Central Range

• Main Authors: Chih-Feng Chuang, 莊志烽
• Other Authors: Ying-San Liou
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/60088215808798116553

碩士 === 國立東華大學 === 自然資源與環境學系 === 99 === Micro-Raman spectroscopy has been conducted to identify the CM (carbonaceous material) of rocks from the Nengkuo Pass of the Central Range. In order to testify the empirical equation used to calculate the peak metamorphic temperature, spectra has been deconvoluted to be disordered and characteristic bands. Result indicates that D- and O-line in the CM's Raman spectra applied to the empirical equation proposed by Beyssac et al. in 2002 is the most suitable. The higher the metamorphic grade of the rock, the crystallinity of CM increase, while the peak-position difference between D1 and G band , the ratio of FWHM , and the ratio the integrated intensity decrease. In addition, peak-position difference between D1 and G bands, and the ratio of FWHM (full width at half maximum) applied to model the metamorphic grade indicate that is useful and convenient to differentiate the metamorphic grade of the rock. The peak-position difference of the D1 and G band between the prehnite-pumpellyite and the low grade greenschist facies, as well as low- and high-grade greenschist facies is suggested to be 2.70 and 2.56, respectively. Based on the value proposed above, the changes of metamorphic facies can been defined that, from west to east, west of Dafong and Hiaoin Bridge (LU-045) is low grade greenschist facies, to the east is prehnite-pumpellyite facies , and the east of KL-013 is the high grade greenschist facies . A viewpoint on small-scale the temperature of RSCM is related to the geological structures nearby. As a result, we can find that the shorter the distance between rock and fault is, the higher peak temperature is and the peak temperature of the hanging wall of the reverse fault is obviously higher than that of foot wall. In the synclinorium, the closer to the fold axis is, the lower peak temperature is, however, in the anticlinorium is on the contrary. Overall, east of the Backbone Range's region, not only the activities triggered by neighboring geologic structures affect metamorphic temperature, the influence of tectonic movement, deformation and denudation with larger scale but also be considered. Geological structures of Backbone Range are different between the east and the west sides. It includes that in the east of investigated area exhibits the faster uplifting and denudation rate due to the steep hanging wall of the reverse fault and the deeper metamorphic rock which suffered higher temperature and more buried metamorphism now exposed on the Earth’s surface. It can be confirmed that the peak metamorphic temperature in the eastern side of the Backbone Range is higher than that in the western side. According to dating data of study region and neighborhood, the uplifting rate in the east of the Backbone Range is estimated to be 1.4-6.0 mm/y at least.