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The petrology and geochronology of the gabbro-dioritoid rocks from Veľké Železné (Nízke Tatry Mts., Western Carpathians).
- Source :
-
Geologica Carpathica . Feb2024, Vol. 75 Issue 1, p3-20. 18p. - Publication Year :
- 2024
-
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 geochemistry (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., (87Sr/86Sr)360 = 0.7035-0.7044 and εNd360 = +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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *GEOLOGICAL time scales
*GRANITE
*GEOCHEMISTRY
*ZIRCON
*MAGMAS
Subjects
Details
- Language :
- English
- ISSN :
- 13350552
- Volume :
- 75
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Geologica Carpathica
- Publication Type :
- Academic Journal
- Accession number :
- 176771112
- Full Text :
- https://doi.org/10.31577/GeolCarp.2024.02