The petrology and geochronology of the gabbro-dioritoid rocks from Veľké Železné (Nízke Tatry Mts., Western Carpathians)

IF 17.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-05-10 DOI:10.31577/geolcarp.2024.02

Ján Spišiak, Milan Kohút, Juraj Butek, Š. Ferenc, V. Šimonová, Richard Kopáčik, D. Chew

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Abstract

: The gabbro-dioritoid rocks from Veľké Železné (Nízke Tatry Mts., Western Carpathians, Slovakia) were recently studied in order to better understand the age, origin, and evolution of the basic/intermediate magmas associated with Variscan granitic rocks. Their genesis was investigated from the points of view of petrology, whole-rock geo-chemistry (including Sr, Nd, and Pb isotopic characteristics), as well as U–Th–Pb zircon and apatite dating. The Famennian magmatic crystallization age of ca. 360 Ma (determined from zircon: 362.4 ± 2.9 Ma and apatite: 358.4 ± 2.8 Ma) is older than the Tournaisian–Visean ages for granite intrusions in the Tatric Unit. Geochemically, the studied rocks have an affinity to arc-related basalts, consisting of a metaluminous, magnesian, and high-potassium calc-alkaline character. Isotope data (i.e., ( 87 Sr/ 86 Sr) 360 = 0.7035−0.7044 and εNd 360 = +1.4 to +1.6) demonstrate that these gabbro-dioritoids were formed from the mantle-influenced, lower crustal and/or sub-continental lithospheric mantle (SCLM) sources, whereas the unsystematic increase of Pb isotope ratios indicate either the melting of an ancient Enriched mantle-II (EM-II) reservoir or the upper crustal assimilation and/or local fluid alteration. The data presented in this paper favour the origin of the studied gabbro-dioritoids at a continental arc, although we cannot rule out their genesis as a result of the subsequent slab break-off.

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Veľké Železné （西喀尔巴阡山脉 Nízke Tatry 山）辉长岩-闪长岩的岩石学和地质年代学

:最近对Veľké Železné（斯洛伐克西喀尔巴阡山脉Nízke Tatry山）的辉长岩-闪长岩进行了研究，以更好地了解与瓦里斯山花岗岩岩相关的基本岩浆/中间岩浆的年龄、起源和演化。研究人员从岩石学、全岩地球化学（包括锶、钕和铅同位素特征）以及锆石和磷灰石的 U-Th-Pb 测定角度研究了它们的成因。法门期岩浆结晶年龄约为 360 Ma（根据锆石测定：362.4 ± 2.9 Ma，磷灰石测定：358.4 ± 2.8 Ma），比塔特里克单元花岗岩侵入体的图尔奈斯期-维谢期年龄要早。从地球化学角度看，所研究的岩石与弧相关玄武岩相近，具有金属铝、镁和高钾钙碱性特征。同位素数据（即( 87 Sr/ 86 Sr) 360 = 0.7035-0.7044 和 εNd 360 = +1.4 至 +1.6) 表明这些辉长岩-闪长岩是由受地幔影响的下地壳和/或次大陆岩石圈地幔（SCLM）来源形成的，而铅同位素比值的非系统性增加表明要么是古代富集地幔-II（EM-II）储层的熔融，要么是上地壳同化和/或局部流体蚀变。本文提供的数据支持所研究的辉长岩-闪长岩起源于大陆弧，尽管我们不能排除它们的成因是随后的板块断裂。

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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.