# Chiziwa Kazutoyo

Affiliate Master Yamaguchi University

# Mode of Occurrence of optical anisotropy (reflectance anisotropy) of coaly matters in progress of organic metamorphism

Bulletin of the Faculty of Education, Yamaguchi University. Natural science Volume 40 Issue 2 Page 7-32
published_at 1990-09
Title

Mode of Occurrence of optical anisotropy (reflectance anisotropy) of coaly matters in progress of organic metamorphism
Creators Chijiwa Kazutoyo
Source Identifiers
Coals of bituminous to anthracite rank exhibit optically anisotropic character and behave as uniaxial negative or a biaxial substances. Consequently, maximum reflectance (Rmax) and minimum reflectance (Rmin) are measured under polarized light in rotating the microscope stage. The difference between Rmax and Rmin is called the optical anisotropy (reflectance anisotropy) or bireflectance. The relationship between vitrinite reflectance, the mostly used microscopic rank measure, and reflectance anisotropy determined by a method which has been newly proposed by the author is investigated. The following simple and multiple regression equations were obtained by a least squares method. When the value of the mean maximum reflectance (Romax) is 3.08% or less ; Rm = 0.9170 Romax + 0.0368 (r^2 = 0.9962) Re = 0.9210 Romax + 0.0374 (r^2 = 0.9972) When the value of the mean maximum reflectance is more than 3.08% ; Rm = 0.66440 Romax - 0.99266 Rr + 1.26781 (r^2 = 0.8923) Re = 0.76630 Romax - 1.27010 Rr + 1.02336 (r^2 = 0.9290) The mean average reflectance (Rm) can be converted to the mean random reflectance (Re) by the empirically derived equation : Re = 1.0166 Rm - 0.0241 (r^2 = 0.9962) Since reflectance anisotropy influences the reflectance parameters, the reversal of values of mean random reflectance and mean average reflectance within higher rank coals, with advance of coalification, is stressed. The reflectance anisotropy generally increases with increasing of rank. However..
Subjects

Languages eng
Resource Type departmental bulletin paper
Publishers 山口大学教育学部
Date Issued 1990-09
File Version Not Applicable (or Unknown)