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Rock compositions of the Ch-6 sandstones in the WJY area, Ordos Basin. (a) Ternary diagram showing framework grain compositions. (b) Histogram displaying the compositions of rock fragments. Q, Quartz; F, feldspar; R, rock fragments; I, quartz arenite; II, subarkose; III, sublitharenite; IV, arkose; V, lithic arkose; VI, feldspathic litharenite; and VII, litharenite.
