Tectono-metamorphic history recorded in garnet porphyroblasts: insights from thermodynamic modelling and electron backscatter diffraction analysis of inclusion trails

Skrzypek, Etienne; Schulmann, Karel; Štípská, Pavla; Chopin, Francis; Lehmann, J.; Lexa, Ondrej; Haloda, J.

doi:10.1111/j.1525-1314.2010.00925.x

Cited by 38 publications

(28 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is assumed that the orientation of pre‐S3 minerals is preserved in the hinge zone during F3 fold development whereas minerals in the limbs may rotate and could acquire a different orientation. This assumption is supported by a quantitative microstructural study of garnet porphyroblasts from the same area (Skrzypek et al. , 2010).…”

Section: Petrographymentioning

confidence: 75%

Prograde and retrograde metamorphic fabrics - a key for understanding burial and exhumation in orogens (Bohemian Massif)

Skrzypek¹,

Štípská²,

Schulmann³

et al. 2011

Journal of Metamorphic Geology

Self Cite

View full text Add to dashboard Cite

International audienceIn the Orlica-Snieznik Dome (NE Bohemian massif), alternating belts of orthogneiss with high-pressure rocks and belts of mid-crustal metasedimentary-metavolcanic rocks commonly display a dominant subvertical fabric deformed into a subhorizontal foliation. The first macroscopic foliation is subvertical, strikes NE-SW and is heterogeneously folded by open to isoclinal folds with subhorizontal axial planes parallel to the heterogeneously developed flat-lying foliation. The metamorphic evolution of the mid-crustal metasedimentary rocks involved successive crystallization of chlorite-muscovite-ilmenite-plagioclase-garnet, followed by staurolite-bearing and then kyanite-bearing assemblages in the subvertical fabric. This was followed by garnet retrogression, with syntectonic crystallization of sillimanite and andalusite parallel to the shallow-dipping foliation. Elsewhere, andalusite and cordierite statically overgrew the flat-lying fabric. With reference to a P-T pseudosection for a representative sample, the prograde succession of mineral assemblages and the garnet zoning pattern with decreasing grossular, spessartine and X-Fe are compatible with a P-T path from 3.5-5 kbar/490-520 degrees C to peak conditions of 6-7 kbar/similar to 630 degrees C suggesting burial from 12 to 25 km with increasing temperature. Using the same pseudosection, the retrograde succession of minerals shows decompression to sillimanite stability at similar to 4 kbar/similar to 630 degrees C and to andalusite-cordierite stability at 2-3 kbar indicating exhumation from 25 km to around 9-12 km. Subsequent exhumation to similar to 6 km occurred without apparent formation of a deformation fabric. The structure and petrology together with the spatial distribution of the metasedimentary-metavolcanic rocks, and gneissic and high-pressure belts are compatible with a model of burial of limited parts of the upper and middle crust in narrow cusp-like synclines, synchronous with the exhumation of orogenic lower crust represented by the gneissic and high-pressure rocks in lobe-shaped and volumetrically more important anticlines. Converging P-T-D paths for the metasedimentary rocks and the adjacent high-pressure rocks are due to vertical exchanges between cold and hot vertically moving masses. Finally, the retrograde shallow-dipping fabric affects both the metasedimentary-metavolcanic rocks and the gneissic and high-pressure rocks, and indicates that the similar to 15-km exhumation was mostly accommodated by heterogeneous ductile thinning associated with unroofing of a buoyant crustal root

show abstract

Section: Petrographymentioning

confidence: 75%

Prograde and retrograde metamorphic fabrics - a key for understanding burial and exhumation in orogens (Bohemian Massif)

Skrzypek¹,

Štípská²,

Schulmann³

et al. 2011

Journal of Metamorphic Geology

Self Cite

View full text Add to dashboard Cite

show abstract

“…mica schists in the other parts of the eastern Orlica–Śnieżnik Dome (Skrzypek et al . , , ; Štípská et al ). Studies on the metapelites in the western part of the OSD suggest more complicated P–T histories (Szczepański, ; Faryad and Kachlik, , Fig.…”

Section: Discussionmentioning

confidence: 99%

“…The development of the oblique foliations (S1 and S2 in this study) also corresponds to the superposition of vertical and subhorizontal fabrics proposed in other studies (Skrzypek et al . , ; Chopin et al . ; Štípská et al .…”

Section: Discussionmentioning

confidence: 99%

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

2015

View full text Add to dashboard Cite

This integrated study on the pressure–temperature–deformation‐time record of the Goszów light quartzites from the Młynowiec–Stronie Group (Sudety Mts., SW Poland) provides new data that improve our understanding of the structure and geodynamic development of the Orlica–Śnieżnik Dome (OSD) as a Gondwana‐derived unit involved in the formation of the Variscan orogen. The structural and metamorphic record of the Goszów light quartzites, when compared to the under‐ and overlying rock formations, indicates that the whole Młynowiec–Stronie Group in the eastern part of the Saxothuringian terrane functioned as a single, integral lithotectonic unit with no visible structural or metamorphic discontinuities. The sequence of structures and thermodynamic modelling indicate that the light quartzites underwent the same polyphase tectonometamorphic evolution as the adjacent rocks belonging to the Młynowiec–Stronie Group. The development of tight, N–S‐trending folds and axial penetrative metamorphic foliation was related to metamorphic progression from 500 °C to 640 °C at 6–7 kbar. Subsequently, under the retrogressive conditions below 540 °C, the foliation was reactivated as a result of subsequent N–S‐directed ductile shearing and extension. Therefore, the study of the light quartzites exemplifies the penetrative structures in the OSD, and the metamorphic foliation and N–S‐trending lineation are composite structures. The monazite metamorphic ages of ca. 364 Ma and 335 Ma may be related to the approximately E–W‐ and N–S‐oriented tectonic movements, respectively, which occurred during the amalgamation of the Saxothuringian terrane with Brunovistulia. In contrast, the previously unknown early Palaeozoic monazite age of ca. 494 Ma is interpreted as the protolith age of the light quartzites. Copyright © 2015 John Wiley & Sons, Ltd.

show abstract

“…On the other hand, a correct understanding of the coupling between deformation and metamorphism is critical for the reconstruction of P‐T‐D‐t paths of deformed metamorphic rocks (Williams & Jercinovic, ) and their significance for orogenic evolution. In this sense, combined in situ petrologic and microstructural data allow to link deformation mechanisms, metamorphic reactions, and macroscopic structural features and to infer the relative timing of different mineral associations and microstructures (Goncalves et al, ; Hobbs et al, ; Johnson, ; Marsh et al, ; Oriolo et al, ; Skrzypek et al, ; Yakymchuk & Godin, ). The absolute timing of deformation and metamorphism, in turn, can be constrained by interpreting in situ geochronologic data in the light of microstructures, which provide insights into mineral equilibria, deformation mechanisms, and metamorphic reactions (Bosse & Villa, ; Gasser et al, ; Mulch & Cosca, ; Oriolo, et al, ; Oriolo et al, ; Schulz, ; Tchato et al, ; Villa et al, ; Williams & Jercinovic, ).…”

Section: Introductionmentioning

confidence: 99%

The Late Paleozoic Tectonometamorphic Evolution of Patagonia Revisited: Insights From the Pressure‐Temperature‐Deformation‐Time (P‐T‐D‐t) Path of the Gondwanide Basement of the North Patagonian Cordillera (Argentina)

et al. 2019

View full text Add to dashboard Cite

Combined field structural analysis with in situ electron probe microanalysis Th‐U‐Pb monazite dating, petrologic, and microstructural data provides a reconstruction of the pressure‐temperature‐deformation‐time (P‐T‐D‐t) path of the Gondwanide basement of the North Patagonian Cordillera. For samples from the Challhuaco hill, the timing of development of the metamorphic S2 foliation and associated L2 lineation and tight to isoclinal F2 folds is constrained by monazite ages of 299 ± 8 and 302 ± 16 Ma during peak metamorphic conditions of ~ 650 °C and 11 kbar, achieved during prograde metamorphism and progressive deformation. Metamorphism and deformation of metamorphic complexes of the North Patagonian Andes seem to record Late Paleozoic crustal thickening and are coeval with metamorphism of accretionary complexes exposed further west in Chile, suggesting a coupled Late Devonian‐Carboniferous evolution. Instead of the result of continental collision, the Gondwanide orogeny might thus be essentially linked to transpression due to advancing subduction along the proto‐Pacific margin of Gondwana. On the other hand, second generation of monazite ages of 171 ± 9 and 170 ± 7 Ma constrains the timing of low‐grade metamorphism related to kink band and F3 open fold development during Jurassic transtension and emplacement of granitoids. Finally, a Cretaceous overprint, likely resulting from hydrothermal processes, is recorded by monazite ages of 110 ± 10 and 80 ± 20 Ma, which might be coeval with deformation along low‐grade shear zones during the onset of Andean transpression.

show abstract

Tectono-metamorphic history recorded in garnet porphyroblasts: insights from thermodynamic modelling and electron backscatter diffraction analysis of inclusion trails

Abstract: International audienc

Cited by 38 publications

References 72 publications

Prograde and retrograde metamorphic fabrics - a key for understanding burial and exhumation in orogens (Bohemian Massif)

Prograde and retrograde metamorphic fabrics - a key for understanding burial and exhumation in orogens (Bohemian Massif)

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

The Late Paleozoic Tectonometamorphic Evolution of Patagonia Revisited: Insights From the Pressure‐Temperature‐Deformation‐Time (P‐T‐D‐t) Path of the Gondwanide Basement of the North Patagonian Cordillera (Argentina)

Contact Info

Product

Resources

About