Transient allanite replacement and prograde to retrograde monazite (re)crystallization in medium-grade metasedimentary rocks from the Orlica-Śnieżnik Dome (Czech Republic/Poland): Textural and geochronological arguments

Skrzypek, Etienne; Bosse, Valérie; Kawakami, Tetsuo; Martelat, Jean-Emmanuel; Štípská, Pavla

doi:10.1016/j.chemgeo.2016.11.033

Cited by 15 publications

(12 citation statements)

References 80 publications

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“…7k, l, o), which match those mentioned above, suggests that monazite growth could have occurred during at least two separate tectonometamorphic events at ~360 Ma and ~340 Ma. The obtained results match the monazite geochronology study by Skrzypek et al (2017), who confirmed a long duration for the monazite growth but considered ages of 360−340 Ma to represent the period of prograde monazite growth under amphibolite-facies conditions. In addition, our data correspond well with those from the rocks of the Staré Město Belt, which also experienced prolonged metamorphism from the progression of the Barrovian metamorphism at ~368 Ma to the late, retrogressive metamorphic event at 340–330 Ma (Jastrzębski et al 2013) (Fig.…”

Section: Discussionsupporting

confidence: 89%

“…This observation may explain the wide age histograms and the presence of individual dates down to ~300 Ma. These youngest ages may pinpoint the last exhumation stages of the OSD rocks, which were exposed to the infiltration of retrogressive fluids under subsurface conditions (Skrzypek et al 2017). Although monazite was selected for this study because of this mineral's role as a powerful geochronological tool to provide records of igneous protoliths and younger metamorphic events, it has to be kept in mind that the stability of monazite may be affected by various post-growth processes.…”

Section: Discussionmentioning

confidence: 99%

“…Previous geochronological isotopic studies on the metamorphism of the OSD rocks involved various isotopic techniques, such as Pb–Pb zircon evaporation, the U–Pb SHRIMP (sensitive high-resolution ion microprobe) dating of zircon, the Ar–Ar and K–Ar dating of mica and amphibole, the Rb–Sr dating of micas, the Sm–Nd and Lu–Hf dating of garnet, and the Th–Pb dating of monazite (more review in Żelaźniewicz et al 2014; Skrzypek et al 2017). The results predominantly indicated a Late Palaeozoic metamorphic record in both the MP and volumetrically minor (U?…”

Section: Geological Setting and Previous Studiesmentioning

confidence: 99%

“…Th–U–total Pb monazite records also indicated the presence of (tectono)metamorphic events at ~360 Ma and ~335 Ma in migmatic paragneisses of the Młynowiec Formation (Jastrzębski et al 2014), and mica schists (Budzyń & Jastrzębski, 2015) and light quartzites of the Stronie Formation (Jastrzębski, Budzyń & Stawikowski, 2016). Integrated, the electron microprobe and isotopic methods of monazite dating indicated that ages between 360 and 340 Ma reflect the regional metamorphism, whereas the predominant age population of 330−310 Ma refers to complex retrograde processes (Skrzypek et al 2017).…”

Section: Geological Setting and Previous Studiesmentioning

confidence: 99%

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Cambro-Ordovician vs Devono-Carboniferous geodynamic evolution of the Bohemian Massif: evidence fromP–T–tstudies in the Orlica–Śnieżnik Dome, SW Poland

2017

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The pressure–temperature–deformation–time (P–T–d–t) record of metagranitic rocks and adjacent diverse rocks of the metavolcano-sedimentary group from the Orlica–Śnieżnik Dome (OSD) in SW Poland is examined. The study aims to better understand the course of the break-up of northern Gondwana and the overprinting Variscan tectonometamorphism in the NE Bohemian Massif. We test the existing hypotheses that explain the Cambro-Ordovician thermal event recorded in the meta-supracrustal group by (i) syn-deformational regional metamorphism or (ii) the contact metamorphism of the (meta)sedimentary rocks around the intruding ~490–500 Ma granitic magmas. In addition, we check the extent and timing of the Variscan prograde and retrograde medium-pressure metamorphism in the OSD. The results imply that Early Palaeozoic monazites, rarely preserved in both rock groups, document ~490–500 Ma volcanic and plutonic events related to the Gondwana's break-up and following disturbance of the Th–U–Pb system during younger, Variscan events. The monazite geochronology reveals no distinct Cambro-Ordovician thermal aureole around the post-granitic orthogneisses. However, no large-scale Variscan juxtaposition is evident between the two main OSD rock groups or within the meta-supracrustal rocks. Consistent P–T–d–t results for the meta-supracrustal rocks and the orthogneisses suggest that their precursors contacted before the Variscan tectonometamorphism. The directly contiguous ortho- and paragneisses together experienced tectonometamorphic processes at maximum depths that correspond to 7.5–8.0 kbar and maximum temperatures of ~600–620°C, as a result of the Variscan collision of Gondwana and Euramerica. The continental collision-related events intensified at ~360 Ma and ~330–340 Ma.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: Geological Setting and Previous Studiesmentioning

confidence: 99%

Section: Geological Setting and Previous Studiesmentioning

confidence: 99%

See 2 more Smart Citations

Cambro-Ordovician vs Devono-Carboniferous geodynamic evolution of the Bohemian Massif: evidence fromP–T–tstudies in the Orlica–Śnieżnik Dome, SW Poland

2017

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“…Some nice examples exist in the literature (Janots et al 2008;Janots et al 2009;Regis et al 2014). Skrzypek et al (2016) provide textural and geochronological arguments to constrain monazite petrogenesis and the age of metamorphic events in medium-grade metasedimentary rocks from the Orlica-Śnieżnik Dome (Czech Republic/Poland). A first monazite generation formed via allanite breakdown during garnet growth at prograde to peak P-T conditions (5-7 kbar, 575-640 °C) at around 360-340 Ma.…”

Section: Example 4 Polyclism and Polymetamorphismmentioning

confidence: 99%

Petrochronology and hygrochronology of tectono-metamorphic events

Bosse

Villa

2019

Gondwana Research

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U-Th-Pb petrochronology is based on the incontrovertible fact that the diffusion of radiogenic Pb is negligibly small relative to retrograde reaction rates. Multi-element maps demonstrate that patchy textures tightly correspond to (U+Th)-Pb age variations, requiring that fluid-induced dissolution/ reprecipitation is the principal cause of Pb mobility. Attempts to model intracrystalline core-rim Pb zonations as diffusive transport are not legitimate unless genuine bell-shaped diffusion profiles in minerals can be documented, which happens only exceptionally. Monazite and zircon intra-grain age maps confirm that coupled dissolution-reprecipitation and retrogression reactions assisted by fluids control (Th+U)-Pb ages, not temperature. The chemical zonations observed in many (Th+U)-bearing mineral chronometers (e.g. monazite, allanite, xenotime, zircon) provide petrological constraints. Linking petrology with textures and the isotope record allows reconstructing entire segments of the P-T-AX -D-t history of a rock and its geodynamic environment. The dearth of mathematically sound diffusion profiles equally applies to the isotope record of micas and feldspars. The tight link between petrology, microtextures, chemical composition and geochronology also pertains to Rb-Sr and K-Ar. Overdetermined multi-mineral Rb-Sr isochrons with excess scatter, and spatially resolved/stepwise release 39 Ar-40 Ar results, demonstrate ubiquitous correspondence between relict phases and isotopic inheritance. Many rock-forming minerals are highly retentive of Sr and Ar, unless they are obliterated by retrograde reactions. The rates of dissolution in fluid-controlled reactions are several orders of magnitude faster at upper and mid-crustal levels than diffusive reequilibration rates. Thus, as a rule Rb-Sr and K-Ar chronometers date their own formation. Accurately establishing P-T paths of monometamorphic rocks requires assessing petrologic equilibrium using multivariate thermodynamic software. Dating complex parageneses of polymetamorphic, unequilibrated rocks requires labor-intensive disentangling by: (i) qualitative identification of relicts, retrogression reactions, and chemically open systems by imaging techniques (e.g. cathodoluminescence, element maps, etc.); (ii) microchemical analyses at the µm-scale quantifying heterochemical disequilibrium phases and assigning them to a P-T-AX segment; (iii) spatially resolved/stepwise release, relating the chemical signature of the analyzed mineral to its age. K-Ar and Rb-Sr usually provide a different perspective on the P-T evolution of a rock than does (Th+U)-Pb, as K+Rb-rich minerals (phyllosilicates and especially feldspars) mostly form later and react/dissolve faster in the retrograde path than U-rich accessory phases (e.g. Mukai et al., 2014). The present paper reviews these general principles by means of well-understood examples, both successful and insuccessful in matching the independently known external constraints.

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Compositional Evolution of Ree- and Ti-Bearing Accessory Minerals in Metamorphic Schists of the Atomfjella Series, Western Ny Friesland, Spitsbergen

Haiyati¹,

Gulbin²,

Сироткин³

et al. 2023

Springer Proceedings in Earth and Environmental Sciences

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Transient allanite replacement and prograde to retrograde monazite (re)crystallization in medium-grade metasedimentary rocks from the Orlica-Śnieżnik Dome (Czech Republic/Poland): Textural and geochronological arguments

Cited by 15 publications

References 80 publications

Cambro-Ordovician vs Devono-Carboniferous geodynamic evolution of the Bohemian Massif: evidence fromP–T–tstudies in the Orlica–Śnieżnik Dome, SW Poland

Cambro-Ordovician vs Devono-Carboniferous geodynamic evolution of the Bohemian Massif: evidence fromP–T–tstudies in the Orlica–Śnieżnik Dome, SW Poland

Petrochronology and hygrochronology of tectono-metamorphic events

Compositional Evolution of Ree- and Ti-Bearing Accessory Minerals in Metamorphic Schists of the Atomfjella Series, Western Ny Friesland, Spitsbergen

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