Petrogenesis of Miocene volcanism in the Central Anatolia: Geochemical, isotopic and geochronological evidence

IF 2.4 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Volcanology and Geothermal Research Pub Date : 2024-04-26 DOI:10.1016/j.jvolgeores.2024.108086

Şenel Özdamar , Mehmet Z. Billor , Oral Sarıkaya , Bala Ekinci Şans , Taşkın Deniz Yıldız , Fahri Esenli , Haibo Zou , Sarah Sherlock , Ali Haydar Gültekin

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Abstract

This paper presents the first ⁴⁰Ar/³⁹Ar age data, new bulk-rock major-trace element compositions and NdSr isotope geochemistry, combined with detailed geological mapping of Galatia Volcanic Province (GVP) in the northwest Central Anatolia (Turkey). Here, there are voluminous extrusive rocks in a wide compositional range: a basalt, andesite and trachyte suite, and their pyroclastic equivalents. ⁴⁰Ar/³⁹Ar dating of two whole-rock samples from the GVP yielded plateau ages of 21.76 ± 0.8 Ma and 20.97 ± 0.5 Ma, constrain the volcanic activity at ca. 21 Ma (Aquitanian). The samples show by sub-parallel light rare earth element (LREE)-enrichment and relatively flat heavy rare earth element (HREE) patterns and moderate fractionation [average (La/Yb)_N = 13.5]. Their initial ^87/86Sr values vary between 0.704619 and 0.704998, while initial ^143/144Nd values lie between 0.512673 and 0.512755. Integration of the geochemical and geochronological with geological data we propose that the volcanic rocks in the northern area of GVP with calc-alkaline affinity were produced by a lithospheric mantle magma in an extensional setting.

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安纳托利亚中部中新世火山的岩石成因：地球化学、同位素和地质年代证据

本文首次提出了 40Ar/39Ar 年龄数据、新的大块岩石主要微量元素成分和钕锶同位素地球化学数据，并结合详细的地质绘图，介绍了土耳其安纳托利亚中部西北部的加拉蒂亚火山省（GVP）。这里有大量成分范围很广的喷出岩：玄武岩、安山岩和闪长岩套件及其等同的火成碎屑岩。对来自 GVP 的两个整块岩石样本进行 40Ar/39Ar 测定，得出的高原年龄分别为 21.76 ± 0.8 Ma 和 20.97 ± 0.5 Ma，将火山活动的时间限定在约 21 Ma（阿奎坦纪）。这些样品显示出近平行的轻稀土元素富集和相对平坦的重稀土元素富集模式，以及中等程度的分馏[平均 (La/Yb)N = 13.5]。它们的 87/86Sr 初始值介于 0.704619 和 0.704998 之间，而 143/144Nd 初始值介于 0.512673 和 0.512755 之间。综合地球化学、地质年代和地质数据，我们认为，大温带北部地区的钙碱性火山岩是由扩展环境中的岩石圈地幔岩浆生成的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Volcanology and Geothermal Research 地学-地球科学综合

CiteScore

5.90

自引率

13.80%

发文量

183

审稿时长

19.7 weeks

期刊介绍： An international research journal with focus on volcanic and geothermal processes and their impact on the environment and society. Submission of papers covering the following aspects of volcanology and geothermal research are encouraged: (1) Geological aspects of volcanic systems: volcano stratigraphy, structure and tectonic influence; eruptive history; evolution of volcanic landforms; eruption style and progress; dispersal patterns of lava and ash; analysis of real-time eruption observations. (2) Geochemical and petrological aspects of volcanic rocks: magma genesis and evolution; crystallization; volatile compositions, solubility, and degassing; volcanic petrography and textural analysis. (3) Hydrology, geochemistry and measurement of volcanic and hydrothermal fluids: volcanic gas emissions; fumaroles and springs; crater lakes; hydrothermal mineralization. (4) Geophysical aspects of volcanic systems: physical properties of volcanic rocks and magmas; heat flow studies; volcano seismology, geodesy and remote sensing. (5) Computational modeling and experimental simulation of magmatic and hydrothermal processes: eruption dynamics; magma transport and storage; plume dynamics and ash dispersal; lava flow dynamics; hydrothermal fluid flow; thermodynamics of aqueous fluids and melts. (6) Volcano hazard and risk research: hazard zonation methodology, development of forecasting tools; assessment techniques for vulnerability and impact.