migmatiten.

1907 J. J. Sederholm in Bull. Comm. Géol. Finlande 5 xxiii. 110 For the gneisses here in question, characteristic of which are two elements of different genetic value,..the author proposes the name of migmatites.

1942 Proc. Geologists' Assoc. 53 77 Pseudodioritic migmatite is a field-term used to name a group of fairly homogeneous foliated hornblende-rich rocks having a dioritic aspect.

1952 Geol. Mag. 89 1 The term ‘ptygmatic’ was originally coined by Sederholm in 1907 (p. 110) to describe ‘the primary folding caused by melting’ in gneisses and migmatites. The word.., as defined, would embrace most of the contortions, many of which are now included in the term ‘flow fold’, commonly seen in migmatite zones the world over.

1965 G. J. Williams Econ. Geol. N.Z. xiii. 203/2 The monazites and xenotine [read xenotime] in migmatites of the Charleston-Fox River area, do not seem to have produced a red colour in the adjoining felspars.

1974 Encycl. Brit. Micropædia VI. 880/1 Many migmatites probably represent the partial fusion of the metamorphic host during extreme metamorphism.

1985 Ecol. Monogr. 55 244/2 Immediately to the north, migmatite bedrock hills rise to 730 m.

1990 P. Kearey & F. J. Vine Global Tectonics ix. 188 The enriched upper crust would be underlain by a depleted lower crust.., with the boundary..being represented by a zone of migmatites.