Permian A-type rhyolites of the Drienok Nappe, Inner Western Carpathians, Slovakia: Tectonic setting from in-situ zircon U–Pb LA–ICP–MS dating

IF 1 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Geologica Carpathica Pub Date : 2022-06-16 DOI:10.31577/geolcarp.73.2.2

M. Ondrejka, R. Vojtko, M. Putiš, D. Chew, M. Olšavský, P. Uher, O. Němec, Foteini Drakou, Alexandra Molnárová, J. Spišiak

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引用次数: 1

Abstract

Two representative peraluminous A-type rhyolite samples from the Poniky area (the Drienok Nappe) in the Inner Western Carpathians (central Slovakia) were dated using the LA–ICP–MS U–Pb zircon method. These geochronological data represent the first in-situ isotopic dating study undertaken on these volcanic rocks. Oscillatory zoned zircon crystals yielded concordant Permian (Guadalupian) ages of 271.0 ± 1.5 Ma and 267.5 ± 1.6 Ma for the Poniky rhyolites, which supports their genetic link to the analogous mid-Permian (Guadalupian) rhyolites of adjacent Muráň and Vernár nappes. The Ti-in-zircon geothermometry (corrected using the activities of SiO2 and TiO2 using the rhyoliteMELTS thermodynamic software) indicate mean zircon crystallization temperatures of ~910 to 935 °C for the Poniky rhyolites. The results indicate pulses of anorogenic A-type rhyolitic magmatism were coeval with intrusions of granitic rocks associated with an intraplate extensional tectonic regime triggered by asthenospheric upwelling in the Western Carpathian region. The A-type magmatism was most likely related to the break-up of the Pangea supercontinent during the mid-Permian (~270–260 Ma).

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斯洛伐克西部喀尔巴阡山脉Drienok推覆体二叠系a型流纹岩:原位锆石U-Pb LA-ICP-MS定年的构造背景

采用LA-ICP-MS U-Pb锆石测年方法，研究了内喀尔巴阡山脉(斯洛伐克中部)Poniky地区(Drienok推覆体)两个代表性过铝a型流纹岩样品。这些地质年代数据代表了对这些火山岩进行的第一次原位同位素定年研究。振荡带锆石晶体显示，Poniky流纹岩的年龄为271.0±1.5 Ma和267.5±1.6 Ma，与邻近的Muráň和Vernár推覆体的类似中二叠世(瓜达鲁普系)流纹岩具有一致的遗传联系。用流纹岩热力学软件(rhyoliteMELTS)对SiO2和TiO2的活度进行校正，结果表明Poniky流纹岩的平均锆石结晶温度为~910 ~ 935℃。结果表明，喀尔巴阡西部地区的造山a型流纹岩岩浆活动脉冲与花岗岩侵入相一致，并与软流圈上升流引发的板内伸展构造机制有关。a型岩浆活动可能与中二叠纪(~270 ~ 260 Ma)泛大陆的分裂有关。

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来源期刊

Geologica Carpathica 地学-地球科学综合

CiteScore

2.40

自引率

23.10%

发文量

审稿时长

>12 weeks

期刊介绍： GEOLOGICA CARPATHICA covers a wide spectrum of geological disciplines including geodynamics, tectonics and structural geology, volcanology, stratigraphy, geochronology and isotopic geology, karstology, geochemistry, mineralogy, petrology, lithology and sedimentology, paleogeography, paleoecology, paleobiology and paleontology, paleomagnetism, magnetostratigraphy and other branches of applied geophysics, economic and environmental geology, experimental and theoretical geoscientific studies. Geologica Carpathica , with its 60 year old tradition, presents high-quality research papers devoted to all aspects not only of the Alpine-Carpathian-Balkanian geoscience but also with adjacent regions originated from the Mediterranean Tethys and its continental foreland. Geologica Carpathica is an Official Journal of the Carpathian-Balkan Geological Association.