“…However, the accumulated data have continued the debate about rotation and non-rotation of porphyroblasts during growth (e.g. Bell et al, 1992;Passchier et al, 1992;Fay et al, 2008;Bons et al, 2009). Today, both rotational (Prior, 1987;Chan & Crespi, 1999;Ikeda et al, 2002) and non-rotational (Fyson, 1980;Johnson, 1990;Aerden, 1995) behaviours have been documented in nature.…”