Structural, metamorphic and geochronological record in the Goszów quartzites of the Orlica–Śnieżnik Dome (SW Poland): implications for the polyphase Variscan tectonometamorphism of the Saxothuringian terrane

Jastrzębski, Mirosław; Budzyń, Bartosz; Stawikowski, Wojciech

doi:10.1002/gj.2647

Cited by 9 publications

(11 citation statements)

References 47 publications

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“…13). This age spectrum cor re sponds with the pre vi ously ob tained monazite age spec tra de rived from metasedimentary rocksfrom the Orlica-OEnie¿nik Dome (Jastrzêbski et al, 2014(Jastrzêbski et al, , 2016 and from the Staré Mìsto Belt (Gordon et al, 2005;Jastrzêbski et al, 2013). In ter est ingly, the monazite in clu sions in the an da lu site blasts pro vide an age re cord of ca.…”

Section: Th-u-total Pb Geochronologysupporting

confidence: 58%

Monazite stability and the maintenance of Th-U-total Pb ages during post-magmatic processes in granitoids and host metasedimentary rocks: A case study from the Sudetes (SW Poland)

Budzyń

Jastrzębski

2015

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1 Pol ish Acad emy of Sci ences, In sti tute of Geo log i cal Sci ences, Senacka 1, 31-002 Kraków, Po land 2 Pol ish Acad emy of Sci ences, In sti tute of Geo log i cal Sci ences, Podwale 75, 50-449 Wroc³aw, Po land Budzyñ, B., Jastrzêbski, M., 2016. Monazite sta bil ity and the main te nance of Th-U-to tal Pb ages dur ing post-mag matic processes in granitoids and host metasedimentary rocks: a case study from the Sudetes (SW Po land). Geo log i cal Quar terly, 60 (1): 106-123, doi: 10.7306/gq.1254The sta bil ity and main te nance of the age re cord of monazite dur ing post-mag matic pro cesses were stud ied in gra nitic and host metasedimentary rocks from the Sudetes (SW Po land). Un al tered monazite in the K³odzko-Z³oty Stok granitoid provided a Th-U-to tal Pb age of 329 ± 5 Ma, which con strains tim ing of the late stage of pluton em place ment. In con trast, monazite in the Jawornik granitoid re mained un al tered or was par tially re placed by sec ond ary phases, in clud ing (1) al la nite, epidote and, oc ca sion ally, ap a tite; (2) cheralite, al la nite and a mix ture of clays, Fe ox ides and pos si ble un known rare earth el e ment (REE) phases; and (3) K-feld spar and cheralite with sub se quent for ma tion of ti tan ite. Dif fer ent al ter ation prod ucts on the thin sec tion scale in di cate the lo cal char ac ter of the post-mag matic pro cesses af fect ing monazite in duced by alkali-rich flu ids. The al tered and un al tered monazite grains both yielded a Th-U-to tal Pb age of 343 ± 4 Ma. The Th-U-to tal Pb ages of the monazite in the ac com pa ny ing metasedimentary rocks ther mally af fected by in trud ing mag mas were also constrained. In the paragneiss in con tact with the Jawornik granitoid, the un al tered monazite and monazite par tially re placed by al la nite yielded an age of 344 ± 5 Ma. The monazite from the mica schist, far ther from the con tact with the granitoids, ex hibited an age of 336 ± 4.5 Ma. The 344-336 Ma ages dem on strated a re cord of monazite (re)growth dur ing pro longed Variscan meta mor phism. The pre dom i nant early Visean ages con strain the tim ing of the de vel op ment of the Z³oty Stok-Skrzynka Shear Zone and the em place ment of the Jawornik granitoid in tru sion. The age re sults, which are con sis tent with pre vi ous geo chron ol ogy, in di cate that the par tial al ter ation of the monazite did not af fect the in ter nal do mains or the main te nance of the monazite ages. Thus, this study re veals that monazite geo chron ol ogy can pro vide mean ing ful data in crys tal line rocks affected by fluid-in duced post-mag matic pro cesses.

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Section: Th-u-total Pb Geochronologysupporting

confidence: 58%

Monazite stability and the maintenance of Th-U-total Pb ages during post-magmatic processes in granitoids and host metasedimentary rocks: A case study from the Sudetes (SW Poland)

Budzyń

Jastrzębski

2015

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“…850°C. The HP-HT con di tions re ported in the OSD granu lites and eclogites (re view in ¯elaŸniewicz et al, 2014) con trast with the me dium-grade, pri mar ily am phi bolite-fa cies con di tions of the metasedimentary rocks (re view in Cho pin et al, 2012;Jastrzêbski et al, 2015a). The Orlica-OEnie¿nik Dome is thus com posed of both HP-HT and me dium-grade rocks that share only a por tion of their tectonometamorphic evo lu tion (e.g., Štípská et al, 2004Skrzypek et al, 2011).…”

Section: Pressure-temperature Constraintsmentioning

confidence: 97%

“…Ear lier monazite geochronometry stud ies in di cated the pos sibil ity of ca. 380-370 Ma pro gres sive meta mor phism in the region, al though pri mar ily based on me dium-grade rocks (Gordon et al, 2005;Jastrzêbski et al, 2013Jastrzêbski et al, , 2014Jastrzêbski et al, , 2015a. There is no ev i dence that the monazite pre served older ages re lated to growth dur ing pro cesses that oc curred ear lier than ca.…”

Section: Interpretation Of the Monazite Th-u-to Tal Pb Agesmentioning

confidence: 99%

Monazite Th-U-total Pb geochronology and P-T thermodynamic modelling in a revision of the HP-HT metamorphic record in granulites from Stary Gierałtów (NE Orlica-Śnieżnik Dome, SW Poland)

Budzyń

Jastrzębski

Kozub‐Budzyń

et al. 2015

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1 In sti tute of Geo log i cal Sci ences, Pol ish Acad emy of Sci ences, Re search Cen tre in Kraków, Senacka 1, 31-002 Kraków, Po land 2 In sti tute of Geo log i cal Sci ences, Pol ish Acad emy of Sci ences, Re search Cen tre in Wroc³aw, Podwale 75, 50-449 Wroc³aw, Po land 3 AGH Uni ver sity of Sci ence and Tech nol ogy, Fac ulty of Ge ol ogy, Geo phys ics and En vi ron men tal Pro tec tion, al. A. Mickiewicza 30, 30-059 Krakow, Po land 4 Geo log i cal In sti tute of Dionýz Štúr, Mlynská dol ina 1, SK-81704 Bratislava, Slo vak Re pub lic Budzyñ, B., Jastrzêbski, M., Kozub-Budzyñ, G.A., Koneèný, P., 2015. Monazite Th-U-to tal Pb geo chron ol ogy and P-T thermo dy namic mod el ling in a re vi sion of the HP-HT meta mor phic re cord in granu lites from Stary Giera³tów (NE Orlica-OEnie¿nik Dome, SW Po land). Geo log i cal Quar terly, 59 (4): 700-717, doi: 10.7306/gq.1232Ther mo dy namic mod el ling, geothermometric cal cu la tions and monazite Th-U-to tal Pb dat ing via elec tron microprobe anal ysis were used to im prove the pres sure, tem per a ture and tim ing con straints of the HP-HT meta mor phic re cord in granu lites from Stary Giera³tów (NE Orlica-OEnie¿nik Dome, SW Po land). The new data con strained the P-T con di tions to 20-22 kbar and ca. 900-920°C, fol lowed by de com pres sion to ca. 16-18 kbar in the fel sic-to-in ter me di ate granu lites and 18-20 kbar and ca. 950-970°C in the mafic granulite. The lat ter con di tions are con sid ered to closely rep re sent the peak tem per a tures ex pe ri enced by these rocks. In the in ter me di ate granulite, the ma trix monazite and monazite in clu sions in gar net and al la nite yielded an age of 349 ± 2.5 Ma. A HP-HT meta mor phic event with tem per a ture con di tions ex ceed ing 900°C, which are greater than the clo sure tem per a tures of most geochronometers, must have dis turbed and com pletely re set the iso to pic systems, in clud ing the Th-U-Pb sys tem in the monazite. Con se quently, this re set ting pre vented us from con strain ing the age of po ten tial ear lier meta mor phic events or the ig ne ous protolith. The 349 ± 2.5 Ma age is in ter preted as the tim ing of the late-stage HP-HT event and cool ing be low 900°C re lated to the ini tial ex hu ma tion of the granu lites. A com par i son of the new P-T-t con straints with pre vi ous data from the NE Orlica-OEnie¿nik Dome in di cates that the ac ti va tion of the chan nels that exhumed the HP rocks to mid dle crustal depths most likely ini ti ated at ca. 349 Ma, and that all of the meta mor phic rocks in the Orlica-OEnie¿nik Dome likely shared a com mon Variscan evo lu tion af ter ca. 340 Ma.

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“…Hav ing con sid ered also the iso to pic ages de ter mined for metarhyolites set in the M³ynowiec-Stronie Group (Murtezi, 2006;Jastrzêbski et al, 2010Jastrzêbski et al, , 2015Mazur et al, 2013), one may as sume that this regime was ac tive at least at ~515-475 Ma. Crustal thick en ing due to the Variscan col li sion brought about the ver ti cal flat ten ing and re sulted in re gional meta mor phism un der am phi bo lite fa cies con di tions that cli maxed at ~340 Ma, as dem on strated by prac tically all pub lished iso to pic stud ies.…”

Section: Geodynamic Settingmentioning

confidence: 67%

An insight into a gneiss core of the Orlica-Śnieżnik Dome, NE Bohemian Massif: new structural and U–Pb zircon data

Redlińska-Marczyńska

Żelaźniewicz

Fanning

2016

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The Orlica-OEnie¿nik Dome in the Sudetes, the NE Bo he mian Mas sif, em braces two for ma tions of fel sic gneiss es of con trover sial or i gin and evo lu tion. Our study shows that de spite sim i lar geo chem i cal sig na tures, they carry sys tem atic mi nor dif ferences in min eral, iso tope, zir con and geothermobarometric char ac ter is tics. Four vari ants of the Giera³tów gneiss es in clude migmatites and have a lon ger struc tural his tory than the OEnie¿nik augen orthogneisses. U-Pb SHRIMP anal y ses yielded U-Pb ages of ~500 Ma for cores and ~498 Ma for wide outer parts of zir con grains in the twice-folded Giera³tów gneiss es, and an age of ~500 Ma for a dis cor dant neosome vein. Neoproterozoic meta sedi ments were among pre cur sors of the lithologically di ver si fied Giera³tów Gneiss For ma tion. First de for ma tion, meta mor phism, and migmatisation of these rocks oc curred at 515-475 Ma and over lapped with the de vel op ment and em place ment of a por phy ritic S-type gran ite pre cur sor to the OEnie¿nik Gneiss For ma tion. The metagranite (= OEnie¿nik augen orthogneiss) em braced migmatitic xe no liths. Zir con grains from such xe no liths re vealed dis torted and re placed cores which yielded U-Pb ages that dis persed around 507-487 Ma, whilst wide darker poorly zoned out growths yielded ages from ~343 Ma to ~325 Ma (mean ~340 Ma). These out growths were in ter preted as a re cord of Car bon if er ous meta mor phism as sisted by rich Zr-and U-car ry ing flu ids. The Variscan meta mor phic over print was het er o ge neous, and var i ously af fected rocks of the two gneiss for ma tions.

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Structural, metamorphic and geochronological record in the Goszów quartzites of the Orlica–Śnieżnik Dome (SW Poland): implications for the polyphase Variscan tectonometamorphism of the Saxothuringian terrane

Cited by 9 publications

References 47 publications

Monazite stability and the maintenance of Th-U-total Pb ages during post-magmatic processes in granitoids and host metasedimentary rocks: A case study from the Sudetes (SW Poland)

Monazite stability and the maintenance of Th-U-total Pb ages during post-magmatic processes in granitoids and host metasedimentary rocks: A case study from the Sudetes (SW Poland)

Monazite Th-U-total Pb geochronology and P-T thermodynamic modelling in a revision of the HP-HT metamorphic record in granulites from Stary Gierałtów (NE Orlica-Śnieżnik Dome, SW Poland)

An insight into a gneiss core of the Orlica-Śnieżnik Dome, NE Bohemian Massif: new structural and U–Pb zircon data

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