Alteration and breakdown of xenotime-(Y) and monazite-(Ce) in granitic rocks of the Western Carpathians, Slovakia

Broska, Igor; Williams, C. T.; Janák, Marian; Nagy, Géza

doi:10.1016/j.lithos.2004.12.007

Cited by 74 publications

(57 citation statements)

References 22 publications

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“…The monazite and xenotime break down to form LREE-rich apatite and allanite coronas, Y-enriched apatite and epidote, respectively (Fig. 5e,f), for details see Broska et al (2005). The experimental data on monazite alteration to REE-epidote and fluorapatite (P= 450-610 MPa and T = 450 to 500 °C) showed the dependence of alteration products on the character of fluids.…”

Section: The Altered Granitoidsmentioning

confidence: 90%

“…Large monazite crystals occur in the groundmass (T-121) along with xenotime. Both minerals are retrogressed along rims forming epidote-apatite coronas (Broska et al 2005). In a sample of the altered granite (T-33) Al-rich pumpellyite was found as part of the saussuritic assemblage replacing plagioclase (with albite, phengite, epidote; Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Yttrium is accompanied mostly by Dy, Er and Yb with X (Y + HREE) reaching 0.95-0.97. Monazite and xenotime in the altered granites are strongly retrogressed, commonly to well-known apatite-epidote coronas (Finger et al 1998;Broska et al 2005). Monazite breaks down to LREE-rich apatite and allanite, or LREE-rich epidote, while xenotime-(Y) breaks down to Y-enriched apatite and epidote (Fig.…”

Section: Allanite-(ce) Monazite-(ce) and Xenotime-(y)mentioning

confidence: 99%

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Variscan thrusting in I- and S-type granitic rocks of the Tribeč Mountains, Western Carpathians (Slovakia): evidence from mineral compositions and monazite dating

Broska¹,

Petrík²

2015

Geologica Carpathica

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Abstract:The Tribeč granitic core (Tatric Superunit, Western Carpathians, Slovakia) is formed by Devonian/Lower Carboniferous, calc-alkaline I-and S-type granitic rocks and their altered equivalents, which provide a rare opportunity to study the Variscan magmatic, post-magmatic and tectonic evolution. The calculated P-T-X path of I-type granitic rocks, based on Fe-Ti oxides, hornblende, titanite and mica-bearing equilibria, illustrates changes in redox evolution. There is a transition from magmatic stage at T ca. 800-850 °C and moderate oxygen fugacity (FMQ buffer) to an oxidation event at 600 °C between HM and NNO up to the oxidation peak at 480 °C and HM buffer, to the final reduction at ca. 470 °C at ∆NN = 3.3. Thus, the post-magmatic Variscan history recorded in I-type tonalites shows at early stage pronounced oxidation and low temperature shift back to reduction. The S-type granites originated at temperature 700-750 °C at lower water activity and temperature. The P-T conditions of mineral reactions in altered granitoids at Variscan time (both I and S-types) correspond to greenschist facies involving formation of secondary biotite. The Tribeč granite pluton recently shows horizontal and vertical zoning: from the west side toward the east S-type granodiorites replace I-type tonalites and these medium/coarse-grained granitoids are vertically overlain by their altered equivalents in greenschist facies. Along the Tribeč mountain ridge, younger undeformed leucocratic granite dykes in age 342 ±4.4 Ma cut these metasomatically altered granitic rocks and thus post-date the alteration process. The overlaying sheet of the altered granites is in a low-angle superposition on undeformed granitoids and forms "a granite duplex" within Alpine Tatric Superunit, which resulted from a syn-collisional Variscan thrusting event and melt formation ~340 Ma. The process of alteration may have been responsible for shifting the oxidation trend to the observed partial reduction.

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Section: The Altered Granitoidsmentioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Section: Allanite-(ce) Monazite-(ce) and Xenotime-(y)mentioning

confidence: 99%

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Variscan thrusting in I- and S-type granitic rocks of the Tribeč Mountains, Western Carpathians (Slovakia): evidence from mineral compositions and monazite dating

Broska¹,

Petrík²

2015

Geologica Carpathica

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“…Some monazite grains were pre served un al tered, in di cat ing the lim ited trans port of el e ments through the fluid and the lo cal char ac ter of the al ter ations. The monazite re place ment by al la nite, epidote and, rarely, ap a tite cor re sponds to clas sic ex am ples of the par tial to com plete re place ment of monazite by these phases, which are rec og nized in var i ous ig ne ous and meta mor phic rocks (Broska and Siman, 1998;Fin ger et al, 1998;Broska et al, 2005b;Majka and Budzyñ, 2006;Petrík et al, 2006;Janots et al, 2008;Ondrejka et al, 2012;Berger et al, 2013). Such al ter ations involve a sup ply of the re quired el e ments from the re act ing sil icates ac cord ing to the fol low ing re ac tion pro posed by Broska and Siman (1998): monazite + annite + an or thite + quartz + fluid = ap a tite + al la nite + mus co vite (or K-feld spar).…”

Section: Monazite In Metamorphic Rocksmentioning

confidence: 99%

“…One clas sic ex am ple of monazite al ter ation is the break down of monazite and its par tial-to-com plete re placement by sec ond ary ap a tite, al la nite and epidote with or with out ThSiO 4 or ThO 2 , which have been iden ti fied in var i ous rocks of gra nitic com po si tion (Broska and Siman, 1998;Fin ger et al, 1998;Broska et al, 2005b;Budzyñ et al, 2010;Ondrejka et al, 2012). Within the last de cade, in creas ing knowl edge of the stabil ity of monazite has been sup ported by sev eral ex per i men tal stud ies that have pro vided im por tant in for ma tion for pet ro log ical ap pli ca tions.…”

Section: Introductionmentioning

confidence: 99%

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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Accessory Phases in the Genesis of Igneous Rocks

Broska

Petrík

2014

Society of Earth Scientists Series

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Alteration and breakdown of xenotime-(Y) and monazite-(Ce) in granitic rocks of the Western Carpathians, Slovakia

Cited by 74 publications

References 22 publications

Variscan thrusting in I- and S-type granitic rocks of the Tribeč Mountains, Western Carpathians (Slovakia): evidence from mineral compositions and monazite dating

Variscan thrusting in I- and S-type granitic rocks of the Tribeč Mountains, Western Carpathians (Slovakia): evidence from mineral compositions and monazite dating

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)

Accessory Phases in the Genesis of Igneous Rocks

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