Implication of Mineralogy and Isotope Data on the Origin of the Permian Basic Volcanic Rocks of the Hronicum (Slovakia, Western Carpathians)

Ján Spišiak,Štefan Ferenc,Viera Šimonová,Juraj Butek,Jozef Vozár,Anna Vozárová

doi:10.3390/min11080841

Ján Spišiak, Štefan Ferenc + Show 4 more

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https://doi.org/10.3390/min11080841

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Abstract

The paper presents new geochemical data of the basic to intermediate volcanic rocks from the Hronic unit. The studied rocks are strongly altered and the primary mineral composition (clinopyroxenes, amphiboles, spinels, biotites, and plagioclases) is preserved only in some localities. The clinopyroxene corresponds to augite and primary amphiboles to pargasites. Spinels have a chemical composition similar to spinels from volcanic rocks. According to chemical composition, the studied basalts correspond to rift-related continental tholeiites. 143Nd/144Nd vs. 87Sr/86Sr isotopic ratios of the basalts are scattered around the value of 143Nd/144Nd for CHUR, where 143Nd/144Nd ratios are relatively stable and 87Sr/86Sr values are relatively varied. According to isotopic ratio of 207Pb/204Pb vs. 206Pb/204Pb, the basalt analyses lie in the field of EMII (mantle source enriched with crustal materials). The new results of U-Pb LA-ICP-MS dating of apatite point to an age 254 ± 23 Ma (Lopingian).

Highlights

The Pennsylvanian–Permian continental sedimentary basin of the Hronicum represents a type of retroforeland basin [1,2], whose origin has been genetically associated with the convergent regime in the final stages of the Western Carpathian Variscan orogeny
This sedimentary basin is characterized by a huge amount of red-beds type siliciclastic sediments accompanied by basic to intermediate volcanic rocks
This article studied basic to intermediate volcanic rocks whose genesis and chemical composition are closely related to the tectonic processes that led to the formation of the Hronicum Pennsylvanian–Permian sedimentary realm

Summary

Introduction

The Pennsylvanian–Permian continental sedimentary basin of the Hronicum represents a type of retroforeland basin [1,2], whose origin has been genetically associated with the convergent regime in the final stages of the Western Carpathian Variscan orogeny. This sedimentary basin is characterized by a huge amount of red-beds type siliciclastic sediments accompanied by basic to intermediate volcanic rocks. Previous analyses of the Hronicum basalts/andesites have been focused on their field distribution and description of structural relations and especially on their mineral and chemical composition [9,10,11].

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