Fig. 4: A representative outcrop showing fold structures in the Songshan Group.
From: Changes in orogenic style and surface environment recorded in Paleoproterozoic foreland successions
Litho-structural mapping (a, d–f) and field photographs (b, c) showing a representative outcrop of the Songshan fold belt. The folds are overturned or recumbent in which overturned limbs of quartzite layers were thinned and disaggregated due to strong subhorizontal contraction and progressive shearing, with a top-to-the-SE shear and thrust sense. The variation in deformation between quartzite and quartz-mica schist reveals their different competencies. The attitudes (in blue) of foliation and axial planes and hinges of folds are marked.
