Sedimentary Environments and Coal Accumulation of the Middle Xishanyao Formation, Jurassic, in the Western Dananhu Coalfield, Turpan-Hami Basin

Figure 5

Analysis of control factors on coal accumulation: (a) relationship between coal thickness, stratum thickness, and coarse sediment (conglomerate and sandstone) - strata ratio; (b) relationship between coal thickness, stratum thickness, and coarse (conglomerate and sandstone) - fine (siltstone and mudstone) ratio.

(a)

(b)