Pan-African high-pressure metamorphism in the Precambrian basement of the Menderes Massif, western Anatolia, turkey
INTERNATIONAL JOURNAL OF EARTH SCIENCES, cilt.89, sa.4, ss.793-811, 2001 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 89 Sayı: 4
- Basım Tarihi: 2001
- Doi Numarası: 10.1007/s005310000097
- Dergi Adı: INTERNATIONAL JOURNAL OF EARTH SCIENCES
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.793-811
- Anahtar Kelimeler: eclogites, eclogitic metagabbros, Menderes Massif, high-pressure metamorphism, MESOZOIC COVER SERIES, GARNET, MG, FE, GEOTHERMOMETER, CALIBRATION, EVOLUTION, ECLOGITES, DEFORMATION, TEMPERATURE
- Dokuz Eylül Üniversitesi Adresli: Evet
Özet
The Menderes Massif is made up of Pan-African basement and a Paleozoic to Early Tertiary cover sequence imbricated by Late Alpine deformation. The Precambrian basement comprises primarily medium- to high-grade schists, paragneisses, migmatites, orthogneisses, metagranites, charnockites, and metagabbros. High-pressure relies in the Pan-African basement are divided into two groups: eclogites and eclogitic metagabbros. The mineral assemblage in the eclogites is omphacite (Jd 44)-garnet-clinozoisite-rutile. The eclogites occur as pods and boudinaged layers in the basement schists and paragneisses. Inclusions found in the cores of the garnets indicate a medium-pressure protolith. The eclogitic metagabbros are closely related to Precambrian gabbroic stocks. The igneous texture and relic magmatic phases are preserved in these high-pressure rocks, which are characterized by the mineral assemblage omphacite (Jd 25)-garnet-rutile +/- kyanite. The P-T conditions of the Pan-African high-pressure metamorphism in the eclogites are estimated to be 644 degreesC with a minimum pressure of approximately 15 kbar. The eclogites are partly to completely retrograded to garnet amphibolites by a Barrovian-type overprint which developed under isothermal decompression conditions. For this post-eclogitic event, the P-T estimates are 7 kbar and 623 degreesC. The eclogite relies provide strong support for a correlation of the Menderes Massif with the Bitlis Massif in terms of common Pan-African high-pressure evolution.