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Yıl 2020, Cilt 2 , Sayı 1, Sayfalar 1 - 12 2020-04-01

Petrographic and Geochemical Fingerprints of Sub-Volcanic Dykes and their Host Harzburgites from the Ulaş Ultramafics Sivas, Turkey

Özgür BİLİCİ [1] , Hasan KOLAYLI [2] , Ekrem KALKAN [3] , Tuğba BİLİCİ [4] , Necmi YARBAŞI [5]


In the southern Ulaş region Sivas, mid-Anatolia , the ophiolitic fragments of the Neotethys oceanic lithosphere are widespread. The study area consists of commonly harzburgite, with minor dunite and chromitite pods and also pyroxenites. The latter are sub-volcanic gabbro and diabase dykes. In this study, the petrographic and geochemical importance of the mantle harzburgites and the sub-volcanic dykes cutting them were evaluated, within these ophiolitic units. The textural properties of the harzburgites were generally anhedral, granular and partially poikilitic. They consisted of olivine, orthopyroxene and minor amount of clinopyroxene and chromian spinel. On the other hand, the textural and mineralogical characteristics of sub-volcanic dykes, consisted of plagioclase, pyroxene, hornblende, opaque minerals and their secondary products, reflected semi-depth characters. The major, trace and rare earth element compositions indicated that the harzburgites were similar to that of both abyssal and supra-subduction SSZ peridotites with depleted character. Furthermore, the sub-volcanic dykes that formed the focus of this study in the mantle harzburgites exhibited N-MORB Normal Mid-Ocean Ridge Basalt type patterns of rare earth REE and trace elements. Especially, negative Nb anomaly showed the presence of a subduction component with the late stage modification of subduction-derived fluids/melts. All results indicated that the dykes characterized as N-MORB and late recorded the characteristics of Ocean Island Basalts OIB . Consequently, geochemical features of the harzburgites and sub-volcanic dykes that cut them showed that peridotites were affected by two different tectonic setting conditions such as MORB and SSZ.
peridotites, sub-volcanic dyke, subduction zone, Ulaş ultramafics, Sivas
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Birincil Dil en
Bölüm Research Article
Yazarlar

Yazar: Özgür BİLİCİ
Kurum: Ataturk University, Oltu Earth Sciences Faculty, Department of Petroleum and Natural Gas Engineering, 25400 Erzurum, Turkey

Yazar: Hasan KOLAYLI
Kurum: Karadeniz Technical University, Engineering Faculty, Department of Geological Engineering, 25240 Erzurum, Turkey

Yazar: Ekrem KALKAN
Kurum: Ataturk University, Oltu Earth Sciences Faculty, Department of Geological Engineering, 25400 Erzurum, Turkey

Yazar: Tuğba BİLİCİ
Kurum: Ataturk University, Oltu Earth Sciences Faculty, Department of Petroleum and Natural Gas Engineering, 25400 Erzurum, Turkey

Yazar: Necmi YARBAŞI
Kurum: Ataturk University, Oltu Earth Sciences Faculty, Department of Geological Engineering, 25400 Erzurum, Turkey

Tarihler

Yayımlanma Tarihi : 1 Nisan 2020

AMA Bilici Ö , Kolaylı H , Kalkan E , Bilici T , Yarbaşı N . Petrographic and Geochemical Fingerprints of Sub-Volcanic Dykes and their Host Harzburgites from the Ulaş Ultramafics Sivas, Turkey. IJESKA. 2020; 2(1): 1-12.