The ages of detrital zircon grains from one paragneiss and inherited zircon cores from two augen gneissesfrom the amphibolite facies basement of the Peloritani Mountains (southern Italy) measured by SHRIMPU–Pb constrain the previously unknown deposition age of the original sediments and help to elaborate amodel for their provenance and subsequent evolution. The deposition age is latest Neoproterozoic to Cambrian(~545 Ma), bracketed by the combined ages of the youngest detrital/inherited zircon populations and of zirconfrom virtually coeval granitoids that intrude themetasediments. This is consistentwith the subgreenschist faciesPalaeozoic volcano–sedimentary sequences exposed in the southern Peloritani Mountains being the originalcover rocks of the northern Peloritani late Neoproterozoic to early Cambrian basement. The age spectra of the detrital/inherited zircon grains show that the Neoproterozoic/Cambrian sediments were derived from the erosionof sources dominated by Neoproterozoic rocks with ages in the range of 0.85–0.54 Ga, with other main componentsaged 1.1–0.9 and ~2.7–2.4 Ga, and a minor one aged ~1.6 Ga, as typically found in peri-Gondwanan terranes.The presence of a large amount of Grenvillian-aged zircon contradicts previous models that propose aWest African affinity for the Calabria–Peloritani Terrane, and the absence of 2.2–1.9 Ga Trans Amazonian/Tapajós–Parima/Eburnean zircon rules out an Amazonian provenance. The age spectra are more consistentwith the basement sediments having an East African origin, similar to that of the early Palaeozoic sandstonesin southern Israel and Jordan, part of a “provenance regionality” sharedwith other terranes currentlylocated in the eastern Mediterranean area.

Peri-Gondwanan origin and early geodynamic history of NE Sicily: A zircon tale from the basement of the Peloritani Mountains

FIANNACCA, PATRIZIA;CIRRINCIONE, ROSOLINO;PEZZINO, Antonino
2012-01-01

Abstract

The ages of detrital zircon grains from one paragneiss and inherited zircon cores from two augen gneissesfrom the amphibolite facies basement of the Peloritani Mountains (southern Italy) measured by SHRIMPU–Pb constrain the previously unknown deposition age of the original sediments and help to elaborate amodel for their provenance and subsequent evolution. The deposition age is latest Neoproterozoic to Cambrian(~545 Ma), bracketed by the combined ages of the youngest detrital/inherited zircon populations and of zirconfrom virtually coeval granitoids that intrude themetasediments. This is consistentwith the subgreenschist faciesPalaeozoic volcano–sedimentary sequences exposed in the southern Peloritani Mountains being the originalcover rocks of the northern Peloritani late Neoproterozoic to early Cambrian basement. The age spectra of the detrital/inherited zircon grains show that the Neoproterozoic/Cambrian sediments were derived from the erosionof sources dominated by Neoproterozoic rocks with ages in the range of 0.85–0.54 Ga, with other main componentsaged 1.1–0.9 and ~2.7–2.4 Ga, and a minor one aged ~1.6 Ga, as typically found in peri-Gondwanan terranes.The presence of a large amount of Grenvillian-aged zircon contradicts previous models that propose aWest African affinity for the Calabria–Peloritani Terrane, and the absence of 2.2–1.9 Ga Trans Amazonian/Tapajós–Parima/Eburnean zircon rules out an Amazonian provenance. The age spectra are more consistentwith the basement sediments having an East African origin, similar to that of the early Palaeozoic sandstonesin southern Israel and Jordan, part of a “provenance regionality” sharedwith other terranes currentlylocated in the eastern Mediterranean area.
2012
SIMS; Peri-Gondwana; Peloritani
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/44288
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