Effects of Igneous Intrusion on Microporosity and Gas Adsorption Capacity of Coals in the Haizi Mine, China

Figure 4

Macroscopic appearance of the igneous sills (a). Photomicrographs (b), (c), and (d) were obtained using SEM. Altered coal showing devolatilization vacuoles (vac), sample 1, 𝑅_𝑜=2.78, magnification 5000x (b); altered coal showing fine mosaic texture, sample 2, 𝑅_𝑜=2.75, 500x (c); altered coal showing (vac), sample 4, 𝑅_𝑜=2.69, 5000x (d).

(a)

(b)

(c)

(d)