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A new isogon‐cleavage classification and its application to natural and model fold studies
Author(s) -
Treagus Susan H.
Publication year - 1982
Publication title -
geological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.721
H-Index - 54
eISSN - 1099-1034
pISSN - 0072-1050
DOI - 10.1002/gj.3350170105
Subject(s) - fold (higher order function) , cleavage (geology) , geometry , geology , mathematics , computer science , paleontology , programming language , fracture (geology)
Traditional methods of studying natural folds are reviewed. A new method of describing cleavage attitude in folds is presented; the β plot. The combined graph of dip isogon angle ϕ (Hudleston 1973) and cleavage angle β is proposed as a linked classification of fold and cleavage geometry. Plots of β and βϕ are given for three natural fold examples. The classification is extended to the geometry and strain attitude (βϕ 5 ) of two finite‐element models and the classical folding models. Results are compared and some tentative conclusions drawn on the relationship of cleavage, the XY plane of strain and dip isogons.