Geometrical classification of conjugate vein arrays

A classification of conjugate Vein arrays is proposed on the basis of three angular parameters that can be readily measured at outcrops. Relationships amongst these parameters imply that geometry of conjugate vein arrays vari es within a continuous spectrum limited by three end-members. A new triangular plot is devised for representation of conjugate vein array s, and its application is substantiated by several published and new exampl es. Evidence from overprinting relationships and consistency in the orienta tions of principal stresses imply that different types of conjugate vein ar rays can develop in a common stress system. (C) 2000 Elsevier Science Ltd. All rights reserved.