Petrogenesis of the late Miocene Chenar volcanism in the southeast Urumieh-Dokhtar magmatic belt, Kerman, Iran: evidence from geochemical, U-Pb geochronologic, and Hf isotopic constraints

IF 17.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-01-29 DOI:10.1344/geologicaacta2024.22.1

Hamideh Salehi, Elham Shahosinie

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Abstract

The Chenar volcanic cone intruded the southeastern part of the Dehaj-Sarduiyeh volcano-sedimentary belt, in the southeast Urumieh-Dokhtar magmatic arc in Iran. The adakitic rocks, with porphyritic texture, mainly consist of rhyodacites and dacites,commonly comprised of phenocrysts of plagioclase, hornblende and biotite, with rare K-feldspar in a groundmass composed of plagioclase, K-feldspar and quartz. They yielded U-Pb zircon ages of 5.52±0.099Ma, 5.46±0.12Ma, and 6.44±0.12Ma, and radiogenic ɛHf(t) values ranging from +3.1 to +12.7. The whole-rock geochemical analysis of these rocks reveals transitional calc-alkaline to shoshonitic characteristics. The geochemical characteristics of the study rocks, particularly their high Sr/Y (⁓51.6-136.8) at low Y (⁓4.43–16.2ppm) and high La/Yb (⁓28.4–118.4ppm) at low Yb (⁓0.2–1.3ppm), are coherent with a high silica adakitic signature. The whole-rock positive Eu/Eu* anomaly and zircon Ce/Ce* anomaly reflect the effects of an oxidized magmatic signature where the rocks of the study area originated from a mantle source. The high silica adakite geochemical characteristics of the Chenar volcanic cone support formation by partial melting of the modified mantle under the influence of metasomatized subducted oceanic slab in a post-collisional environment.

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伊朗克尔曼乌鲁米耶-多赫塔尔岩浆带东南部晚中新世切纳尔火山活动的成岩作用：来自地球化学、U-Pb地质年代和Hf同位素约束的证据

切纳尔火山锥侵入伊朗乌鲁米耶-多赫塔尔岩浆弧东南部的德哈杰-萨尔迪耶火山沉积带东南部。阿达基特岩具有斑状构造，主要由流纹岩和达基特岩组成，通常由斜长石、角闪石和斜长石的表晶组成，还有罕见的钾长石，基质由斜长石、钾长石和石英组成。这些岩石的U-Pb锆石年龄分别为5.52±0.099Ma、5.46±0.12Ma和6.44±0.12Ma，放射性ɛHf(t)值为+3.1至+12.7。这些岩石的全岩地球化学分析表明，它们具有从钙碱性岩向霰石岩过渡的特征。研究岩石的地球化学特征，尤其是低Y（⁓4.43-16.2ppm）时的高Sr/Y（⁓51.6-136.8）和低Yb（⁓0.2-1.3ppm）时的高La/Yb（⁓28.4-118.4ppm），与高硅白蜡岩特征相一致。全岩正Eu/Eu*异常和锆石Ce/Ce*异常反映了氧化岩浆特征的影响，即研究区域的岩石起源于地幔源。切纳尔火山锥的高硅adakite地球化学特征支持在碰撞后环境中，在变质俯冲大洋板块的影响下，通过部分熔化修正地幔而形成。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.