TEXTURAL METAMORPHIC ZONE

DESCRIPTION: Textural zone name after Turnbull, I.M.; Mortimer, N.; Craw, D. 2001 Textural zones in the Haast Schist -- a reappraisal. New Zealand journal of geology and geophysics, 44(1): 171-183.

Valid entries:

I

No penetrative metamorphic fabric

IIA

Incipient metamorphic fabric

IIB

Pervasive penetrative metamorphic fabric

III

Incipient mineral segregation and fine (less than 0.5 mm) white mica

IV

Pervasive mineral segregation and coarse (greater than 0.5 mm) white mica

cover

Basement rocks obscured by cover rocks or water

Addition of ? (e.g. ?IIB) indicates uncertainty