、:? Two sets of conjugate joints developed in Cretaceous sandstone, Chucheng, Shandong Provience
Two sets of conjugate joints developed in Cretaceous sandstone,Chucheng, Shandong Provience
Elements of an en echelon joint system aal-bb'. en echelon zone, MM en echelon axis, Ben echelon angle, AW. Width of the en echelon zone
Elements of an en echelon joint system: aa'-bb'.en echelon zone, MM‘en echelon axis, βen echelon angle, AW. Width of the en echelon zone
En echelon joints developed in limestone, tuoli Beijing. Note the left-lateral(right-step type) and right-lateral-lateral (left-step type) joint patterns
En echelon joints developed in limestone, Tuoli, Beijing.Note the left-lateral (right-step type) and right-lateral-lateral (left-step type) joint patterns
Formation of hexagonal cooling joints(columnar structure)that form around uniformly distributed centers of contraction. Arrows indicate orientations of tensile stresses(After Hatcher R.D., 1995)
Formation of hexagonal cooling joints (columnar structure) that form around uniformly distributed centers of contraction.Arrows indicate orientations of tensile stresses (After Hatcher R.D., 1995)
Plume axis Fringe joints Main ioint face fringe step Detail of plume structure on ioint surface (After bankwitz 1966)
Detail of plume structure on joint surface（After Bankwitz,1966） Main joint face Plume axis fringe Fringe joints step