Petrological and source region characteristics of ophiolitic hornblende gabbros from the Aksaray and Kayseri regions, central Anatolian crystalline complex, Turkey
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Dosyalar
Tarih
2005
Yazarlar
Dergi Başlığı
Dergi ISSN
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Yayıncı
PERGAMON-ELSEVIER SCIENCE LTD
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Many Neo-Tethyan ophiolitic bodies are well exposed as thrust-slices in Central Anatolia and are predominantly represented by massive hornblende gabbros, most of which are cut by Supra Subduction Zone (SSZ) plagiogranites. The allochthonous gabbros are distinct from their autochthonous counterparts, with their mineralogy including both igneous hornblende, relict diopside rimmed by replacement hornblende and their chemical composition corresponding mostly to gabbro rather than diorite. The results of major and trace element analyses of forty-two samples, and REE analyses of nine samples, indicate that the homblende gabbros are SSZ-type and formed from a wet magma by high-degree partial melting of peridotite possibly coupled with contamination by predominantly neighbouring-slab derived fluids within an intra-oceanic back-arc basin. The mafic magmas then underwent high-level fractional crystallization involving titaniferous magnetite, diopside, tschermakite and possibly olivine. Emplacement was followed by extensive ocean-floor metamorphism, which has induced crystallization (or recrystallization) of chlorite, biotite, amphiboles and mobilisation of most of the major elements such as alkali and alkali earth elements, and some LREE. (c) 2004 Elsevier Ltd. All rights reserved.
Açıklama
Anahtar Kelimeler
gabbro, ophiolite, geochemistry, petrology, crystalline complex, central Anatolia, Turkey
Kaynak
JOURNAL OF ASIAN EARTH SCIENCES
WoS Q Değeri
Q3
Scopus Q Değeri
Q1
Cilt
25
Sayı
6
