Detrital zircon ages and provenance of a Cambrian succession in the Sierra Albarrana Domain (SW Iberian Massif)

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Solís Alulima, B.E. and Abati Gómez, Jacobo and López Carmona, Alicia and Gutiérrez Alonso, Gabriel and Fernández Suárez, Javier and Stockli, Daniel F. (2022) Detrital zircon ages and provenance of a Cambrian succession in the Sierra Albarrana Domain (SW Iberian Massif). Lithos (Oslo. Print), 408-9 (106542). ISSN 0024-4937

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Official URL: https://www.sciencedirect.com/science/article/pii/S0024493721005855



Abstract

This study presents the first U-Pb geochronological data on detrital zircon grains from the metasedimentary successions of the Sierra Albarrana Domain (SW Iberian Massif) obtained by SHRIMP and LA-ICP-MS. We provide new information on the Maximum Depositional Ages (MDA) during the middle Cambrian through a systematic study, together with age comparisons of the successions, using Kernel Density Estimates (KDE) diagrams, Cumulative Age Distributions (CADs) and the Kolmogorov–Smirnov (K-S) test.

On the other hand, the U-Pb zircon data presented in this study have been compared with all the existing data from detrital zircon grains in Neoproterozoic and Cambrian rocks of the Iberian Massif (20 samples, 2706 U–Pb zircon ages). For the comparison, in addition to the KDEs, CADs and K-S test, we apply 3D multidimensional scaling techniques (3D-MDS). The results, together with the geochemical and isotopic characterisation from previous studies, suggest that this domain is likely to be part of the autochthonous section of the Central Iberian Zone (CIZ). Zircon age patterns indicate a probable sedimentary provenance from the Saharan Metacraton with, or without, minor input from the Tuareg Shield. The most important local detrital source corresponds to Cadomian magmatism developed during a magmatic event (535–515 Ma) followed by back-arc extension and early Paleozoic rifting (535–460 Ma). The remaining Mesoproterozoic, Paleoproterozoic and Archean zircon grains would have been provided by the Paleoproterozoic basement and/or the older continental crust recycled in the western sections of the Gondwana margin.


Item Type:Article
Uncontrolled Keywords:U-Pb geochronology, Maximum depositational age (MDA), Central-Iberian zone, Sierra Albarrana domain, Cadomian orogen
Subjects:Sciences > Geology > Stratigraphic geology
Sciences > Geology > Petrology
ID Code:69140
Deposited On:10 Dec 2021 16:12
Last Modified:13 Dec 2021 09:40

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