Anticlockwise P-T evolution of amphibolites from NE Sardinia, Italy: Geodynamic implications for the tectonic evolution of the Variscan Corsica-Sardinia block

Scodina, Massimo; Cruciani, Gabriele; Franceschelli, Marcello; Massonne, Hans‐Joachim

doi:10.1016/j.lithos.2018.12.003

Cited by 14 publications

(18 citation statements)

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“…The occurrence of marble [12] , calcsilicate rocks and especially metabasite lenses and bodies [ 13 , 14 ] is quite common. Metabasites are very interesting because, although retrogressed to amphibolite/greenschist-facies conditions, they still preserve relics of the granulite and eclogite facies [ 1 , 14 , 15 ].…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

“…Nieddu) and consists of a 1.5 km long and 350 to 500 m wide body roughly elongated in SW-NE direction. The main lithology consists of a banded amphibolite formed by alternating centimeter- to decimeter-thick whitish plagioclase-rich bands and dark green amphibole-rich bands; in addition, epidote-rich veins and centimeter-thick levels hosting abundant garnet grains, up to 1 cm in size, are locally found within the banded amphibolite [ 1 , 16 ] ( Fig. 3 b,c).…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

“…47 ⁎⁎ 0.088 99.037 0.554 0.098 0.120 0.097 99.99 Rt mat. 48 ⁎⁎ 0.083 99.065 0.540 0.099 0.113 0.092 99.99 ⁎ data from [1] . ⁎⁎ data from this study.…”

Section: Data Descriptionmentioning

confidence: 99%

“… The single grains were hand-picked and mounted in epoxy resin. Description of data collection SEM imaging was performed on polished and C-coated thin section Minerochemical data were acquired on polished and C-coated thin section by EMP U/Pb dating was performed by HR-ICP-MS-LA on rutile mounted in epoxy resin Data source location Olbia, Sardinia, Italy GPS coordinates: 9°34′29.7′’ E - 40°57′54.8′’ N (WGS84) Data accessibility With the article Related research article Some of the chemical analyses are listed in the supplementary material of the following: [1] M. Scodina, G. Cruciani, M. Franceschelli, H.-J. Massonne, Anticlockwise P-T evolution of amphibolites from NE Sardinia, Italy: Geodynamic implications for the tectonic evolution of the Variscan Corsica-Sardinia block, Lithos 324–325 (2019) 763–775.…”

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Geochemical and geochronological dataset of rutile from a Variscan metabasite in Sardinia, Italy

et al. 2020

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A c. 500 m wide and 1.5 km long body consisting of basic to ultrabasic rocks, metamorphosed up to granulite-facies and retrogressed to amphibolite-facies conditions during the Variscan orogeny, crops out near Olbia (NE Sardinia, Italy). Among abundant samples, one, collected from a garnet-rich centimetric layer, was chosen for a detailed analysis of rutile; chemical analyses of rutile were performed with the electron microprobe on petrographic thin sections, whereas U/Pb ages were determined by LA-ICP-MS on rutile mounted in epoxy resin. Chemical analyses show that rutile included in other minerals (Rt inc ) commonly show higher SiO 2 and FeO contents and lower Nb 2 O 3 and ZrO 2 contents if compared with rutile in the matrix of the garnet-rich layer (Rt mat ). Cr 2 O 3 concentrations are quite similar in both types of rutile. Rt mat commonly shows a greater variability in minor elements, especially Nb 2 O 3 (0.049–0.284 wt.%) and SiO 2 (0.019 - 0.193 wt.%) whereas Rt inc compositions are more homogeneous except for FeO (0.251–0.562 wt.%). The U-Pb isotopic data provided discordant ages and defined a lower intercept in the Tera-Wasserburg diagram of 273 ± 13 Ma. Few compilations of geochemical and geochronological data on rutile in Variscan metabasites can be found in literature, thus these data represent a new insight on a mineral phase the significance and scientific interest of which are rising in the last years. Future studies on the origin and ages of emplacement and metamorphism (either prograde or retrograde) of this kind of rock, widespread in the Variscan chain, will benefit from these data as a term of comparison.

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Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

“…47 ⁎⁎ 0.088 99.037 0.554 0.098 0.120 0.097 99.99 Rt mat. 48 ⁎⁎ 0.083 99.065 0.540 0.099 0.113 0.092 99.99 ⁎ data from [1] . ⁎⁎ data from this study.…”

Section: Data Descriptionmentioning

confidence: 99%

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confidence: 99%

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Geochemical and geochronological dataset of rutile from a Variscan metabasite in Sardinia, Italy

et al. 2020

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“…The metamorphic evolution of the amphibolite and banded amphibolite cropping out in the study area was reconstructed by Scodina et al (2019). The garnet-bearing layers (Figure 2(e) and Figure 3(a,b)) recorded the early metamorphic history while the subsequent retrograde equilibration is documented by the host amphibolite.…”

Section: Montigiu Nieddu Unitmentioning

confidence: 99%

Geology of the Montigiu Nieddu metamorphic basement, NE Sardinia (Italy)

et al. 2020

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A geological map at 1:10,000 scale is presented that shows the distribution of the metamorphic rock units in the area of Montigiu (Mt.) Nieddu (NE Sardinia). These units belong to the High-Grade Metamorphic Complex in the Inner Zone of the Variscan chain of Sardinia. The rocks include different types of migmatite, amphibolite, and retrogressed eclogites. The geological map and cross section show the complex tectonic and metamorphic setting of the area, whereas the metamorphic assemblages and deformation framework represent a valuable tool for the reconstruction of the P-T metamorphic evolution for the crustal sectors involved in the Variscan orogeny. The metamorphic rock units reported in the map derived from the lower and upper continental plates involved in the Variscan collision and were tectonically juxtaposed during the early Carboniferous exhumation stage.

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Giant Garnet Crystals in Wollastonite–Grossularite–Diopside-Bearing Marbles from Tamarispa (NE Sardinia, Italy): Geosite Potential, Conservation, and Evaluation as Part of a Regional Environmental Resource

et al. 2021

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Anticlockwise P-T evolution of amphibolites from NE Sardinia, Italy: Geodynamic implications for the tectonic evolution of the Variscan Corsica-Sardinia block

Abstract: Geodynamic implications for the tectonic evolution of the Variscan Corsica-Sardinia block 4Q2 Q3

Cited by 14 publications

References 63 publications

Geochemical and geochronological dataset of rutile from a Variscan metabasite in Sardinia, Italy

Geochemical and geochronological dataset of rutile from a Variscan metabasite in Sardinia, Italy

Geology of the Montigiu Nieddu metamorphic basement, NE Sardinia (Italy)

Giant Garnet Crystals in Wollastonite–Grossularite–Diopside-Bearing Marbles from Tamarispa (NE Sardinia, Italy): Geosite Potential, Conservation, and Evaluation as Part of a Regional Environmental Resource

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