Stereographic distinction of linear and planar structures from apparent lineations in random exposure planes

Abstract

Linear, planar and composite flow structures are discussed and classified with regard to the stereographic pattern of apparent lineations produced by their constituent fabric elements in random exposure planes. For simple structures it is shown that apparent lineations statistically coincide with either the true projection of a linear structure or the intersection of a planar structure, independent of the habit of their fabric elements. Combined and complex structures are differentiated and examples of the latter, expressed by either linear or planar fabric elements, are given from the Kosciusko batholith. It is pointed out how the different structural components may be identified and resolved in a semi-statistical manner on the Schmidt net.