Petrological and source region characteristics of ophiolitic hornblende gabbros from the Aksaray and Kayseri regions, central Anatolian crystalline complex, Turkey |
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| Authors: | K Kocak F Is&#x;k M Arslan V Zedef |
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| Institution: | aDepartment of Geology, Engineering and Architecture Faculty, Selcuk University, 42040 Konya, Turkey;bDepartment of Geology, Engineering and Architecture Faculty, Karadeniz Technical University, 61080 Trabzon, Turkey;cDepartment of Mining, Engineering and Architecture Faculty, Selcuk University, 42040 Konya, Turkey |
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| Abstract: | 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 hornblende 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. |
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| Keywords: | Gabbro Ophiolite Geochemistry Petrology Crystalline complex Central Anatolia Turkey |
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