A. Vozárová, N. Rodionov, Katarína Šarinová, J. Vozár
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引用次数: 1
摘要
Čierna Hora Mts.二叠纪变安山岩岩浆锆石的U–Pb定年得出了267.0±1.5 Ma的Concordia年龄,对应于Wordian阶时间跨度内的Guadalupian时代。该序列与ČierťažMts的北维波期二叠纪岩石相关。从地球化学角度来看,所研究的火山岩属于过铝质钙碱性岩浆岩套,与碰撞后岩石圈伸展有关。岩石圈的伸展和衰减将促进热软流圈的上升流。在这种情况下,钙碱性亲和力可能是由于玄武岩岩浆的广泛地壳污染造成的。Wordian锆石颗粒边缘新形成的年龄为252.2±3.2Ma的锆石边缘表明了持续的伸展沉降,随后是过热。在所研究的岩浆锆石颗粒的捕虏晶岩芯中发现了新元古代(618±8 Ma)和古元古代(2080±13 Ma)的年龄。所提供的捕虏晶锆石年龄表明其来源于具有Cadomian地壳改造碎片的华力西基底岩石。
U–Pb zircon ages from Permian volcanites of the Čierna Hora Mts. (Western Carpathians, Slovakia): Regional tectonic implications
U–Pb dating of magmatic zircons from the Permian meta-andesites of the Čierna Hora Mts. yielded the Concordia ages of 267.0±1.5 Ma, which correspond to the Guadalupian Epoch in the time span of the Wordian Stage. The sequence was correlated with the Northern Veporic Permian rocks from the Čierťaž Mts. From the geochemical point of view, the studied volcanic rocks belong to a peraluminous calc-alkaline magmatic suite, linked to the post-collisional lithospheric extension. Lithosphere extension and attenuation will promote upwelling of hot asthenosphere. In this context, the calc-alkaline affinity may result through extensive crustal contamination of basaltic magma. Continuous extensional setting, succeeded by overheating is indicated by the newly formed zircon rims of 252.2±3.2 Ma age at the edges of the Wordian zircon grains. The Neoproterozoic (618±8 Ma) and Paleoproterozoic (2080±13 Ma) ages were found within the xenocrystic cores in the studied magmatic zircon grains. The presented xenocrystic zircon ages indicate derivation from the Variscan basement rocks with reworked fragments of Cadomian crust.
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.