U-Pb zircon age of the youngest magmatic activity in the High Tatra granites (Central Western Carpathians)

Abstract

Detailed cathodoluminescence (CL) imaging of zircon crystals, coupled with Laser Ablation Multi-Collector Inductively Coupled Plasma Mass Spectrometry (LA-MC-ICP-MS) U-Pb zircon dating was used to develop new insights into the evolution of granitoids from the High Tatra Mountains. The zircon U-Pb results show two distinct age groups (350±5 Ma and 337±6 Ma) recorded from cores and rims domains, respectively. Obtained results point that the last magmatic activity in the Tatra granitoid intrusion occurred at ca. 330 Ma. The previously suggested age of 314 Ma reflects rather the hydrothermal activity and Pb-loss, coupled with post-magmatic shearing.

Age and origin of the tourmaline-rich hydraulic breccias in the Tatra Granite, Western Carpathians

“…The positive δ 34 S value of the molybdenite is typical of granite-related sulphide mineralization (Rollinson 1993) and is similar to the sulphur isotopic composition of hydrothermal tetrahedrites from the Tatra Mountains (δ 34 S CDT = +1.91 to +2.95; Gawęda et al 2007). The 350 ± 1 Ma model age of molybdenite from the brecciated pegmatite fits within error the whole-rock Rb-Sr isochron age of pegmatites from the same area (345 ± 9.5 Ma; Gawęda 1995), and the U-Pb zircon ages of the host granites (360-340 Ma;Gawęda 2008;Burda et al 2013). Molybdenite age presented here supports also the U-Pb dating of the magmatic activity in the Inner Western Carpathians which was attributed to the prolonged subduction and final plate collision and closure of the Rheic Ocean (Gawęda and Golonka 2011;Broska et al 2013;Burda et al 2013 and references therein).…”

“…The tongue-shaped Tatra granitoid intrusion (Kohút and Janák 1994) consists of several magmatic pulses, all dated by the U-Pb method on zircon: I-type mingled hybrid quartz diorite, interpreted as a mafic precursor and dated at 368 ± 8 Ma, tonalite-granodiorite showing an age interval of 360-370 Ma, syenogranite-monzogranite, locally porphyritic, rich in xenoliths and mafic microgranular enclaves, dated from 350 ± 5 Ma to 337 ± 6 Ma (Poller et al 2000;Gawęda et al 2005;Gawęda 2008Gawęda , 2009Burda et al 2011Burda et al , 2013. Formerly, these granites were dated at 314 ± 4 Ma (Poller and Todt 2000) but this age was later interpreted as to be influenced by the Pb-loss caused by post-magmatic shearing (Gawęda 2009).…”

Geochronology and petrogenesis of granitoid rocks from the Goryczkowa Unit, Tatra Mountains (Central Western Carpathians)

“…1b) and is characterized by the abundance of mafic enclaves and xenoliths of country rocks (Gawęda 2009 Kohút & Janák 1994;Bac-Moszaszwili 1996;Gawęda et al 2005); c -simplified geological map of the study area in the northern part of the Tatra crystalline basement (Giewont Nappe) with sample locations. (Gawęda 2008;Burda 2010;Burda et al 2013). The age of the mafic microgranular enclaves (341 Ma; Poller et al 2001) falls into this range.…”

Age and origin of fluorapatite-rich dyke from Baranec Mt. (Tatra Mts., Western Carpathians): a key to understanding of the post-orogenic processes and element mobility

“…The pegmatites belong to the muscovite class of Černý & Ercit (2005). A whole-rock Rb-Sr age of 345 ± 9 Ma (Gawęda 1995) is consistent with K-Ar dating of muscovite megacrysts, at 343 ± 9 Ma (Deditius 2004), and is temporally associated with the youngest magmatic activity in the Tatra Mountains, dated by the U-Pb method by zircon at 350-340 Ma, with maximum peak at 345 Ma (Gawęda 2008;Burda et al 2013a;Gawęda et al 2016). Variscan exhumation of the Tatra crystalline massif, post-dating the intrusion, was suggested to have occurred at ca.…”

“…1b). The tabular granitoid pluton is composed of several magma batches, with U-Pb zircon emplacement ages between 370 and 340 Ma Kohút et al 2010;Burda et al 2011Burda et al , 2013aKohút & Siman 2011;Gawęda et al 2016).…”