L.Whitney[email protected] .... of a north-dipping subduction zone (Whitney & Dilek, ..... rocks contain skeletal, highly resorbed grossular-rich gar- peraluminous, ...
JOURNAL OF PETROLOGY
VOLUME 39
NUMBER 7
PAGES 1385–1403
1998
Metamorphism during Alpine Crustal Thickening and Extension in Central Anatolia, Turkey: the Nig˘de Metamorphic Core Complex D. L. WHITNEY1∗ AND Y. DILEK2 1
DEPARTMENT OF GEOLOGY AND GEOPHYSICS, UNIVERSITY OF MINNESOTA, MINNEAPOLIS, MN 55455, USA
2
DEPARTMENT OF GEOLOGY, MIAMI UNIVERSITY, OXFORD, OH 45056, USA
RECEIVED DECEMBER 23, 1996; REVISED TYPESCRIPT ACCEPTED FEBRUARY 12, 1998
The Nig˘de massif, a metamorphic core complex in Central Anatolia (Turkey), contains petrologic evidence for the transition from Alpine crustal thickening to extension and exhumation of high-grade midcrustal rocks. Sillimanite–potassium feldspar gneiss formed and partially melted during Barrovian metamorphism and records max¨ ¸ckapılı imum conditions of 5–6 kbar, >700°C. The two-mica U granite and a related dike suite intruded the migmatitic metapelitic rocks, forming a contact aureole that contains andalusite and cordierite. These low-pressure minerals indicate that crustal thickening was followed by exhumation of mid-crustal rocks to relatively shallow depths (
