التفاصيل البيبلوغرافية
| العنوان: |
The petrology and geochronology of the gabbro-dioritoid rocks from Veľké Železné (Nízke Tatry Mts., Western Carpathians). |
| المؤلفون: |
SPIŠIAK, JÁN1 jan.spisiak@umb.sk, KOHÚT, MILAN2 milan.kohut@savba.sk, FERENC, JURAJ BUTEK1,ŠTEFAN1, ŠIMONOVÁ, VIERA1, KOPÁČIK, RICHARD1, CHEW, DAVID3 |
| المصدر: |
Geologica Carpathica. Feb2024, Vol. 75 Issue 1, p3-20. 18p. |
| مصطلحات موضوعية: |
*GEOLOGICAL time scales, *GRANITE, *GEOCHEMISTRY, *ZIRCON, *MAGMAS |
| مصطلحات جغرافية: |
SLOVAKIA |
| مستخلص: |
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] |
| قاعدة البيانات: |
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