Petrological Features of Neogene Ulukale Porphyritic Dome and Çağlarca Radial Dykes in the Tunceli Volcanic, Eastern Turkey

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Doklady Earth Sciences Pub Date : 2024-08-11 DOI:10.1134/s1028334x24601470

Sevcan Kürüm, Abdullah Sar, Muhammed Yasir Yurt, İsmail Yıldırım

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Abstract

This study presents new analytical data for the Ulukale porphyritic dome located within the Neogene Tunceli volcanic rocks, as well as whole rock geochemistry and Sr–Nd isotope data for the Çağlarca radial dykes for the first time. The Ulukale porphyritic dome and the Çağlarca radial dykes, have trachyandesite composition. On trace element diagrams normalized to primitive mantle, samples from the dome and dykes have similar features. Whole-rock geochemistry data for the investigated volcanic rocks indicate they formed from low-degree of partial melting of spinel lherzolite at shallow depths. Accordingly magmatism forming the dome appears to have more acidic composition. Sr–Nd isotope data (εNd(T) value –2.0 and –1.7) for both rock groups indicate a lithospheric subcontinental mantle source. All geochemical data indicate these volcanic rocks had source magma with lherzolitic features which underwent low-degree of partial melting; however, fractional crystallization, magma mixing, contamination in the form of continental crust effects and the effect of subduction-linked sediment melts were shown to be important during magma differentiation. Additionally, all this data shows that these volcanic rocks have the same petrological features as the Tunceli Volcanics, the main product of this magmatism.

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土耳其东部通杰利火山岩新近纪乌卢卡莱斑岩穹丘和恰拉尔卡放射状岩脉的岩石学特征

摘要本研究首次提供了位于新近纪通切利火山岩中的乌卢卡莱斑岩穹丘的新分析数据，以及Çağlarca径向岩体的全岩地球化学和钍钕同位素数据。乌卢卡莱斑岩穹丘和Çağlarca径向岩体的成分为特斜长岩岩。在以原始地幔为标准的微量元素图上，来自穹窿和岩堤的样本具有相似的特征。所调查的火山岩的全岩地球化学数据表明，它们是由浅层低度部分熔化的尖晶石蛭石形成的。因此，形成穹隆的岩浆似乎具有较强的酸性成分。两组岩石的 Sr-Nd 同位素数据（εNd(T)值分别为-2.0 和-1.7）表明其来源于岩石圈次大陆地幔。所有地球化学数据都表明，这些火山岩的源岩浆具有锂鲕粒特征，经历了低度部分熔融；然而，在岩浆分异过程中，碎裂结晶、岩浆混合、大陆地壳效应形式的污染以及与俯冲相关的沉积物熔体的影响被证明是重要因素。此外，所有这些数据都表明，这些火山岩与该岩浆活动的主要产物通杰利火山岩具有相同的岩石学特征。

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来源期刊

Doklady Earth Sciences 地学-地球科学综合

CiteScore

1.40

自引率

22.20%

发文量

138

审稿时长

3-6 weeks

期刊介绍： Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.