Journal of Petrology | Volume 39 | Number 7 | Pages 1385-1403 | 1998
© Oxford University Press 1998
Metamorphism during Alpine Crustal Thickening and Extension in Central Anatolia, Turkey: the Ni
de Metamorphic Core Complex
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
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Abstract |
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The Ni
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 mid-crustal rocks. Sillimanite–potassium feldspar gneiss formed and partially melted during Barrovian metamorphism and records maximum conditions of 5–6 kbar, >700°C. The two-mica Üçkapula,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 (<10 km) at lower temperatures before the emplacement of granitic magma. Formation of andalusite was followed by a second, prograde episode of sillimanite growth during low-pressure—high-temperature metamorphism in the central part of the massif, where magmatism was most extensive. A generalized P–T path for the highest grade rocks therefore consists of an initial clockwise path with a late thermal spike and characterizes burial and subsequent exhumation accompanied by magmatism.
KEY WORDS: Barrovian; metamorphic core complex; metapelitic rocks P–T path; Turkey
* Corresponding author. Telephone: (612) 626-7582. Fax: (612) 625-3819. e-mail: Donna.L.Whitney-1{at}umn.edu
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