Journal of Geological Research

Research Article

Applications of Vitrinite Anisotropy in the Tectonics: A Case Study of Huaibei Coalfield, Southern North China

Figure 6

𝑅 s t - 𝑅 a m polar plots of anthracites. 𝑅 a m -RIS anisotropy magnitude, ( 𝑥 2 − 𝑦 2 ) 1 / 2 ; 𝑅 s t -RIS style, 30- a r c t a n ( 𝑥 / 𝑦 ) where 𝑥 = 𝑅 i n t / ( 𝑅 m a x + 𝑅 i n t + 𝑅 m i n ) + [ 𝑦 + 1 / 3 c o s 3 0 ∘ ] × t a n 3 0 ∘ − 1 / 2 , 𝑦 = [ 𝑅 m a x / ( 𝑅 m a x + 𝑅 i n t + 𝑅 m i n ) − 1 / 3 ] × c o s 3 0 ∘ ; RIS shape described as − 3 0 < 𝑅 s t < 0 -biaxial negative; 0 < 𝑅 s t < + 3 0 -biaxial positive; 𝑅 s t = (−30) uniaxial negative; 𝑅 s t = ( + 3 0 ) uniaxial positive, 𝑅 s t = 0-biaxial neutral.
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