Silvia Volante

ETH Zurich

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Amaury Pourteau

Curtin University

Zheng‐Xiang Li

Xuzhou University of Technology

Adam Nordsvan

University of Hong Kong

William J. Collins

Curtin University

Jiangyu Li

Ocean University of China

Eleanore Blereau

Curtin University

Vitor Barrote

Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences

Noreen J. Evans

Curtin University

Tim Johnson

Curtin University

Annika Dziggel

Ruhr University Bochum

Cooperative Institutions

Curtin University

Australian Research Council

ARC Centre of Excellence for Core to Crust Fluid Systems

Instituto de Geociencias

Centre National de la Recherche Scientifique

Planetary Science Institute

Universidade Federal do Rio de Janeiro

Géoazur

ETH Zurich

Universidade do Estado do Rio de Janeiro

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Supplementary material to "In-situ Rb-Sr geochronology of white mica in young metamafic and metasomatic rocks from Syros: testing the limits of LA-ICP-MS/MS mica dating using different anchoring approaches"

Jesús Muñoz-Montecinos Andrea Giuliani Senan Oesch Silvia Volante Bradley J. Peters

Geochronology

Metasomatism

10.5194/gchron-2024-16-supplement

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Zircon U-Pb and Lu-Hf record from the Archean Lewisian Gneiss Complex, NW Scotland

Lanita Gutieva Annika Dziggel Silvia Volante Tim Johnson

The Lewisian Gneiss Complex (LGC) in NW Scotland, a classic example of Archean lower crust, is mostly composed of deformed and metamorphosed tonalite&#8211;trondhjemite&#8211;granodiorite (TTG) gneisses, gneissose granite sheets, and subordinate mafic, ultramafic, and metasedimentary lithologies. It has been traditionally subdivided into three regions that are interpreted to record discrete ages and metamorphic histories, and which are separated by crustal-scale shear zones. A smear of concordant U&#8211;Pb zircon ages from the granulite-facies central region has been interpreted to record metamorphic resetting of earlier magmatic and granulite facies metamorphic ages during a subsequent high-temperature metamorphic event. Here, we present U&#8211;Pb and Hf isotope data collected via laser-ablation split-stream (LASS) analyses of zircon cores from twenty-seven felsic meta-igneous rocks from the northern, southern, and central regions of the LGC, as well as U&#8211;Pb data from zircon rims within most of those samples.In samples from the northern and southern regions, the crystallization age (i.e., from zircon cores) was calculated from the upper-intercept age, yielding age range of 2.82-2.63 Ga for the northern, and 3.11&#8211;2.63 Ga for the southern region. Zircons in these samples generally have thin or no rims, suggesting an absence of a prolonged high-grade (granulite facies) metamorphic event in those regions. In the central region, zircon cores yield U&#8211;Pb crystallization ages between ca. 3.0 Ga and 2.7 Ga, while zircon rims define a continuous spread of ages from ca. 2.8 to 2.4 Ga. Overall, the central region exhibits a continuous and overlapping smear of zircon core and rim ages, suggesting a protracted thermal event in which high-ultrahigh temperature conditions were maintained for >200 m.y., and that discrete magmatic and metamorphic &#8216;events&#8217; are difficult to identify. Nevertheless, an estimation of the crystallization age of each sample is crucial for interpreting their Lu&#8211;Hf isotopic signature. Zircon cores from the tonalite&#8211;trondhjemite gneisses have broadly chondritic compositions with a range of calculated mean initial &#949;Hf of +2.5 to &#8211;1.2, potentially reflecting a mixture of juvenile material and reworked crust, with one outlier at &#949;Hfi = +4.5 perhaps indicating a renewed influx of juvenile magma. Granite gneisses also have near-chondritic values, although the range is larger and the two youngest granite gneisses have slightly sub-chondritic &#949;Hfi (&#8211;1.5 and &#8211;2.5), which indicates that pre-existing crust was involved in their formation. Since there is no significant difference in the Hf isotopic composition between rocks from the three regions, or between the TTG and granite gneisses, we suggest that the broadly chondritic &#949;Hfi in most of our samples reflects mixing of both depleted mantle and evolved crust during their generation. Despite the similarity of the U-Pb and &#949;Hf data from the three regions, the data do not allow to unambiguously discriminate whether the LGC is composed of different levels of a once continuous Archean continent or discrete microcontinents that were amalgamated in the late Archean to Paleoproterozoic.

Felsic

Geochronology

10.5194/egusphere-egu21-15688

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Zircon trace element, Lu–Hf and U–Pb record from the Archean Lewisian Gneiss Complex, NW Scotland

Goldschmidt Abstracts (2021)

Lanita Gutieva Annika Dziggel Silvia Volante Tim Johnson

Trace element

10.7185/gold2021.4082

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Tectono-metamorphic record of final Nuna assembly and orogenic collapse in the Georgetown Inlier, NE Australia: Insights from multiple P-T-d-t paths

EGUGA (2019)

Silvia Volante William J. Collins Eleanore Blereau Amaury Pourteau Zheng‐Xiang Li

Source

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Fluid-fluxed melting and the origin of hornblendites in Archean TTG

Goldschmidt Abstracts (2023)

Maria Fernanda Torres Garcia Silvia Volante Johann F.A. Diener Annika Dziggel Tim Johnson

10.7185/gold2023.16454

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Progressive versus finite geological mapping: a key for understanding the geodynamic evolution of the Maritime Alps

HAL (Le Centre pour la Communication Scientifique Directe) (2019)

G. Gosso Jean Marc Lardeaux Davide Zanoni Silvia Volante Michel Corsini

geodynamics

Geologic map

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Constraints on the Palaeoproterozoic tectono‐metamorphic evolution of the Lewisian Gneiss Complex, NW Scotland: Implications for Nuna assembly

Journal of Metamorphic Geology (2023)

Silvia Volante Annika Dziggel Jesse B. Walters Noreen J. Evans Maximilian Herbst

Abstract Despite extensive investigation, the tectono‐thermal evolution of the Archean crust in the Lewisian Gneiss Complex in NW Scotland (LGC) is debated. Most U–Pb zircon geochronological and metamorphic studies have focused on rocks from the central region of the mainland LGC, where granulite facies assemblages associated with the oldest (Badcallian) tectono‐metamorphic event at c. 2.75 Ga are overprinted by younger amphibolite facies assemblages related to the Inverian (c. 2.5 Ga) and subsequent Laxfordian (c. 1.9–1.65 Ga) tectono‐thermal events. In the southern and northern regions of the mainland LGC, deformation and metamorphism associated with the Laxfordian event are pervasive, although the timing and conditions are poorly constrained. Here, we present new field, petrographic and structural data, U–Pb zircon and titanite geochronology and phase equilibrium modelling of amphibolite samples from the northern and southern regions. Our field observations show that in both regions, pre‐Laxfordian structures are significantly reworked by steep NW‐striking fabrics that are themselves pervasively overprinted by co‐axial deformation and amphibolite facies metamorphism related to the Laxfordian event. In situ U–Pb titanite geochronology yields Laxfordian ages of 1853 ± 20 Ma in the southern region (P = 6–8 kbar and T = 640–690°C) and 1750 ± 20 Ma and 1776 ± 10 Ma in the northern region (P = 6–7.5 kbar and T = 740–760°C). While U–Pb dating of zircon rims from felsic gneisses in the central region shows a dominant Inverian metamorphic overprint at c. 2500 Ma, zircon rims in felsic gneisses from the northern and southern regions commonly yield Laxfordian dates as young as c. 1800 Ma. Combined, the results support the idea that, during the Palaeoproterozoic, the central region of the LGC acted as low‐strain domain, in which intense deformation and metamorphism were restricted to crustal‐scale shear zones. By contrast, in the southern and northern regions, early (c. 1.85 Ga) and late (c. 1.75 Ga) Laxfordian deformation and fluid‐mediated metamorphism were much more pervasive and at higher P–T conditions than previously proposed. The diachronous Laxfordian evolution of the southern and northern regions indicate that they reflect early and late snapshots of collisional to transpressional tectonics in the mainland LGC. The long‐lasting Laxfordian evolution documents the collision of the Rae and North Atlantic cratons during the Palaeoproterozoic amalgamation of the supercontinent Nuna, with implications for the palaeogeographic configuration of NW Scotland during Palaeoproterozoic Nuna.

Felsic

Geochronology

Titanite

10.1111/jmg.12748

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TTG generation by fluid-fluxed crustal melting: Direct evidence from the Proterozoic Georgetown Inlier, NE Australia

Earth and Planetary Science Letters (2020)

Amaury Pourteau Luc S. Doucet Eleanore Blereau Silvia Volante Tim Johnson

10.1016/j.epsl.2020.116548

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Citations (62)

Spatio–temporal evolution of Mesoproterozoic magmatism in NE Australia: A hybrid tectonic model for final Nuna assembly

Precambrian Research (2022)

Silvia Volante William J. Collins Vitor Barrote Adam Nordsvan Amaury Pourteau

Supercontinent

Laurentia

10.1016/j.precamres.2022.106602

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Minor minerals, major implications: using key mineral phases to unravel the formation and evolution of Earth's crust

Geological Society London Special Publications (2023)

Valby van Schijndel Kathryn Cutts Inês Pereira Martin Guitreau Silvia Volante

Abstract The investigation of key minerals including zircon, apatite, titanite, rutile, monazite, xenotime, allanite, baddeleyite and garnet can retain critical information about petrogenetic and geodynamic processes and may be utilized to understand complex geological histories and the dynamic evolution of the continental crust. They act as small but often robust petrochronological capsules and provide information about crustal evolution, from local processes to plate tectonics and supercontinent cycles. They offer us insights into processes of magmatism, sedimentation, metamorphism and alteration, even when the original protolith is not preserved. In situ techniques have enabled a more in-depth understanding of trace element behaviour in these minerals within their textural context. This has led to more meaningful ages for many stages of geological events. New developments of analytical procedures have further allowed us to expand our petrochronological toolbox while improving precision and accuracy. Combining multiple proxies with multiple minerals has contributed to new interpretations of the crustal history of our planet.

Baddeleyite

Allanite

Titanite

10.1144/sp537-2023-110

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Citations (2)