Basement provenance revealed by U–Pb detrital zircon ages: A tale of African and European heritage in Tuscany, Italy

Paoli, Gabriele; Stokke, Henrik H.; Rocchi, Sergio; Sirevaag, Hallgeir; Ksienzyk, Anna K.; Jacobs, Joachim; Košler, Jan

doi:10.1016/j.lithos.2016.11.017

Cited by 26 publications

(25 citation statements)

References 53 publications

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“…The largest age peak with over a quarter of all ages is of Ordovician age, ca. 480 Ma, and most likely relates to voluminous Ordovician felsic magmatism at the active northern Gondwana margin 10 , 17 . The Neoproterozoic to Archean ages correlates to an African heritage and times when Adria had a peri-Gondwana position.…”

Section: Samples and Methodsmentioning

confidence: 99%

“…3a ), then closest similarities are seen with the proximal and distal succession of the Adria foredeep 22 . In the Oligocene, the Tuscan basement 10 , 17 was largely covered by sedimentary rocks and was therefore not available to contribute as a source for the sediments. The Eocene-Miocene deposits from Corsica-Sardinia have detrital zircon age distributions that lack a significant 250–300 Ma (Variscan) age component, but instead have a significant Grenville-age age group 33 , the latter of which is not present in our samples.…”

Section: Samples and Methodsmentioning

confidence: 99%

“…

Figure 3 Comparison of the APM zircon age record with potential source regions. ( a ) Kernel Density Estimation (KDE 39 ) plots for potential sources of Cenozoic and pre-Mesozoic zircons: APM plot is compared with the age distributions from potential basement sources: proximal and distal successions of the Adria foredeep 22 , Corsica-Sardinia 33 , Tuscan basement 10 , 17 , modern rivers draining the western-central-southern Alps and the northern Apennines 34 , volcaniclastic detritus of the Aveto unit 18 . ( b ) Comparison of the Cenozoic zircon age distributions of the APM and Aveto fm 18 .…”

Section: Samples and Methodsmentioning

confidence: 99%

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Alps to Apennines zircon roller coaster along the Adria microplate margin

Jacobs

Paoli

Rocchi

et al. 2018

Sci Rep

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We have traced the particle path of high-pressure metasedimentary rocks on Elba Island, Northern Apennines, with the help of a U-Pb-Hf detrital zircon study. One quarter of the analysed zircons are surprisingly young, 41-30 Ma, with a main age peak at ca. 32 Ma, indicating an unexpected early Oligocene maximum deposition age. These Oligocene ages with negative εHf indicate a volcanic source region in the central-southern Alps. Though young by geological means, these zircons record an extraordinary geodynamic history. They originated in a volcanic arc, during the convergence/collision of the the Adria microplate with Europe from ca. 65 to 30 Ma. Thereafter, the Oligocene zircons travelled ca. 400 km southward along the Adria margin and the accretionary prism to present-day Tuscany, where they were subducted to depths of at least 40 km. Shortly thereafter, they were brought to the surface again in the wake of hinge roll back of the Apennine subduction zone and the resulting rapid extensional exhumation. Such a zircon roller coaster requires a microplate that has back-to-back subduction zones with opposing polarities on two sides.

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Section: Samples and Methodsmentioning

confidence: 99%

Section: Samples and Methodsmentioning

confidence: 99%

“…

Section: Samples and Methodsmentioning

confidence: 99%

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Alps to Apennines zircon roller coaster along the Adria microplate margin

Jacobs

Paoli

Rocchi

et al. 2018

Sci Rep

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“…Bagnoli et al, 1979;Carmignani, Rau, Squarci, Tongiorgi, & Vai, 1977;Gattiglio, Meccheri, & Tongiorgi, 1989). Recently, Paoli et al (2017) dated this formation to the Early Cambrian -Middle Ordovician, on the basis of detrital zircon ages (maximum depositional age ca. 560 Ma).…”

Section: Stratigraphic and Structural Settingmentioning

confidence: 99%

Geology and tectonic setting of the Fornovolasco area, Alpi Apuane (Tuscany, Italy)

et al. 2018

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The study area is located in the Alpi Apuane (Tuscany, Italy), and extends between N 44°0 ′ 49.883 ′′-E 10°20 ′ 23.467 ′′ (SW corner) and N 44°2 ′ 53.403 ′′-E 10°23 ′ 19.175 ′′ (NE corner). The area shows a pile of tectonic units belonging either to the Apuane metamorphic complex, and Tuscan Nappe, stacked during the Alpine orogeny. The latter is represented by a sedimentary Triassic-Miocene succession, and it is characterized by a large-scale east-dipping monocline, with local excision of stratigraphic terms due to the occurrence of intra-unit lowangle normal faults. The Apuane metamorphic complex is formed by Paleozoic phyllites, post-Variscan magmatic rocks (Fornovolasco Metarhyolite Fm.), and Mesozoic-Tertiary metasedimentary formations. The 1:5000 scale geological map and the cross-sections illustrate the tectonic setting of the Fornovolasco area, resulting from the Tertiary tectonometamorphic events. In the Fornovolasco area, small Tl-rich pyrite + magnetite ore bodies occur close to the contacts between the Paleozoic basement and the cover metasedimentary formations.

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“…The migration of the subduction zone since the Eocene (stippled lines) and the presence of Variscan and peri-Gondwanan terranes in the region are indicated (modified after refs. 8,10,14,64,75 ). The arc changed subduction polarity from south-east to northwest at around 45 Ma (blue) and migrated eastward to its indicated position at 35 Ma (brown).…”

Section: Introductionmentioning

confidence: 99%

Ancient recycled lower crust in the mantle source of recent Italian magmatism

et al. 2019

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Recycling of Earth’s crust through subduction and delamination contributes to mantle heterogeneity. Melt inclusions in early crystallised magmatic minerals record greater geochemical variability than host lavas and more fully reflect the heterogeneity of magma sources. To date, use of multiple isotope systems on small (< 300 μm) melt inclusions was hampered by analytical limitations. Here we report the first coupled Sr-Nd-Pb isotope data on individual melt inclusions from potassium-rich lavas from neighbouring Quaternary volcanoes in central Italy and infer the presence of a previously unidentified ancient lower crustal component in the mantle. We suggest derivation from Variscan or older basement included in the upper mantle by either delamination, sediment recycling, subduction erosion and/or slab detachment processes during Cenozoic subduction and collision of the western Mediterranean. The capability to determine isotope ratios in individual melt inclusions permits the detection of distinctive mantle contaminants and can provide insights into how geodynamic processes affect subduction recycling.

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Basement provenance revealed by U–Pb detrital zircon ages: A tale of African and European heritage in Tuscany, Italy

Cited by 26 publications

References 53 publications

Alps to Apennines zircon roller coaster along the Adria microplate margin

Alps to Apennines zircon roller coaster along the Adria microplate margin

Geology and tectonic setting of the Fornovolasco area, Alpi Apuane (Tuscany, Italy)

Ancient recycled lower crust in the mantle source of recent Italian magmatism

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