Three metamorphic monazite generations in a high-pressure rock from the Bohemian Massif and the potentially important role of apatite in stimulating polyphase monazite growth along a PT loop

Finger, Friedrich; Krenn, Erwin

doi:10.1016/j.lithos.2006.06.003

Cited by 80 publications

(35 citation statements)

References 32 publications

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“…A multiple growth of monazite by dissolution reprecipitation is a common feature in high grade monazite. It may occur, within a short time span of a few million years, during the same metamorphic cycle (Finger and Krenn 2007). Only in one mica schist sample we found clear evidence for an older monazite population with a Permian age of 276 ± 18 Ma ( Table 4).…”

Section: Metapelite Samplesmentioning

confidence: 72%

The Moslavačka Gora crystalline massif in Croatia: a Cretaceous heat dome within remnant Ordovician granitoid crust

et al. 2010

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For a long time the Moslavačka Gora Massif in Croatia has been regarded as a major outcrop of Variscan crystalline basement of the South Tisia block. However, new geochronological data indicate that this massif consists of a Cretaceous S-type granite pluton intruding a Cretaceous low-pressure/high-temperature (LP/HT) metamorphic envelope. The age of the LP/HT metamorphism is estimated at *90-100 Ma using the method of electron microprobe based monazite dating. The Central Granite was dated at 82 ± 1 Ma (LA-SF-ICP-MS zircon age). The metamorphic complex comprises mainly felsic anatexites and orthogneisses of granitic composition, some metapelites (paragneisses and mica schists) and amphibolites. Zircons from three different samples of metagranite were dated at 486 ± 6, 483 ± 6, and 491 ± 1 Ma, suggesting that most of the metamorphic complex represents an Early Ordovician granitic series. The Cretaceous regional metamorphism culminated in granulite facies conditions of *750°C and 3-4 kbar. A retrograde metamorphic event at lower amphibolite facies conditions overprinted the metamorphic complex. This event is probably related to the intrusion of the Central Granite. The southeastern sector of the massif was additionally affected by post-granitic, predominantly NE oriented shearing at greenschist facies conditions. As yet there is no clear evidence for Variscan events in the Moslavačka Gora Massif. Mineral relics of a medium-pressure amphibolite facies metamorphism are preserved in amphibolites. They are older than the Cretaceous LP/HT regional metamorphism, but their age is presently unknown. Some indications for a Permian regional metamorphic event are provided by inherited zircons in the Central Granite that have been dated with a Permian age, and by Permian monazite relics in metapelites. The Cretaceous high heat flow regime recorded in the Moslavačka Gora Massif is unique in the subcrop of the Pannonian Basin and may be a local feature triggered by a mafic intrusion in the lower crust.

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Section: Metapelite Samplesmentioning

confidence: 72%

The Moslavačka Gora crystalline massif in Croatia: a Cretaceous heat dome within remnant Ordovician granitoid crust

et al. 2010

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“…Our objective in using in situ, combined U-Pb and trace-element analysis of monazite is to understand the broad-scale metamorphic response of monazite and its host rocks during subduction to, and exhumation from, UHP conditions. The premise behind collecting trace-element and isotopic data simultaneously is that the trace elements provide insight into the petrological context of the isotopic dates: depressed heavy rare earth element concentrations may indicate that an interpreted U-Pb date coincides with the stability of garnet [Rubatto, 2002], elevated Eu and Sr may indicate HP recrystallization and plagioclase instability [Finger and Krenn, 2007;Holder et al, 2015], and Th and U help understand fluid availability [Hoskin and Schaltegger, 2003] and its potential role in monazite recrystallization [Seydoux-Guillaume et al, 2002]. We show that some monazite survived amphibolite-granulite-facies metamorphism, partial melting, and subduction with its original age intact.…”

Section: Introductionmentioning

confidence: 99%

Monazite response to ultrahigh-pressure subduction from U–Pb dating by laser ablation split stream

et al. 2015

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To assess the response of monazite during subduction of continental crust to mantle depths, U-Pb isotopic ratios and elemental abundances were measured simultaneously by laser-ablation split-stream inductively-coupled plasma mass spectrometry (LASS) in rocks from the ultrahigh-pressure Western Gneiss Region of the Scandinavian Caledonides. Nearly seventy different samples of quartzofeldspathic basement and overlying metasedimentary rocks were studied. Pre-subduction monazite (chiefly 1.6 Ga and 1.0 Ga) is preserved locally in the structurally lowest, basement rocks because earlier, Precambrian tectonism produced coarse-grained, high-grade rocks that were resistant to further recrystallization in spite of syn-subduction temperatures and pressures of 650-800°C and 2-3.5 GPa. A few of the monazite in the metasedimentary rocks atop the basement preserve syn-subduction U-Pb dates, but the majority continued to recrystallize during post-subduction exhumation and record a general westward decrease in age related to westward-progressing exhumation. The absence of Precambrian monazite in the metasedimentary rock atop the basement suggests that sedimentation postdated the 1.0-0.9 Ga high-grade metamorphism and was late Proterozoic to early Paleozoic.

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“…Due to the fact that monazite contains negligible amounts of common Pb relative to radiogenic Pb (Parrish 1990), it is possible to use the chemical Th-U-total Pb method employing an electron microprobe to constrain its age (Jercinovic and Williams 2005;Jercinovic et al 2008;Konečný 2004;Montel et al 1996;Pyle et al 2005;Spear et al 2009;Adachi 1991, 1994;Suzuki and Kato 2008). Although chemical dating of monazite is mostly used in metamorphic petrology (Finger and Krenn 2007;Kohn et al 2005;Liu et al 2007;Rosa-Costa et al 2008;Tickyj et al 2004;Williams et al 2007), it has also found applications in constraining the ages of magmatic events with high precision (Just et al 2011).…”

Section: Introductionmentioning

confidence: 99%

U-total Pb timing constraints on the emplacement of the granitoid pluton of Stolpen, Germany

Lisowiec¹,

Budzyń²,

Słaby³

et al. 2014

Acta Geologica Polonica

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ABSTRACT:Lisowiec, K., Budzyń, B., Słaby, E., Schulz, B., and Renno, A.D. 2014. Th-U-total Pb timing constraints on the emplacement of the granitoid pluton of Stolpen, Germany. Acta Geologica Polonica, 64 (4), 457-472. Warszawa.Monazite from the Stolpen monzogranite (SE Germany) was studied to constrain the Th-U-total Pb age of pluton formation. Monazite grains demonstrate subtle to distinct patchy zoning related to slight compositional variations. Textural and compositional characteristics indicate that the monazite formed in a single magmatic event in a slightly heterogeneous system, and was only weakly affected by secondary alteration, which did not disturb the Th-U-Pb system. Chemical dating of the monazite gave a consistent age of 299 ± 1.7 Ma. The current study presents the first geochronological data for the Stolpen granite. It provides evidence that Stolpen is the youngest Variscan granitic intrusion in the Lusatian Granodiorite Complex and indicates that magmatic activity related to post-collisional extension in this region lasted at least 5my longer than previously assumed.

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Three metamorphic monazite generations in a high-pressure rock from the Bohemian Massif and the potentially important role of apatite in stimulating polyphase monazite growth along a PT loop

Cited by 80 publications

References 32 publications

The Moslavačka Gora crystalline massif in Croatia: a Cretaceous heat dome within remnant Ordovician granitoid crust

The Moslavačka Gora crystalline massif in Croatia: a Cretaceous heat dome within remnant Ordovician granitoid crust

Monazite response to ultrahigh-pressure subduction from U–Pb dating by laser ablation split stream

U-total Pb timing constraints on the emplacement of the granitoid pluton of Stolpen, Germany

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