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The unique Cambro-Ordovician silicic large igneous province of NW Gondwana: Catastrophic melting of a thinned crust



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Rodríguez, Carmen and Castro, Antonio and Gómez Frutos, Daniel and Gutiérrez Alonso, Gabriel and Pereira, Manuel Francisco and Fernández, Carlos (2022) The unique Cambro-Ordovician silicic large igneous province of NW Gondwana: Catastrophic melting of a thinned crust. Gondwana research, 106 . pp. 164-173. ISSN 1342-937X

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Official URL: https://doi.org/10.1016/j.gr.2022.01.011


Cambro–Ordovician silicic magmatism in the Central Iberian Zone of the Iberian Massif (Ollo de Sapo Formation, OSF) constitutes a voluminous and geochemically atypical magmatic event that formed preceding the breakup of the northern margin of Gondwana. To date, and due to uncommon geochemical signatures, such as a high Fe, Mg content compared to anatectic melts and the departing from the calc-alkaline trends, the origin of such magmatic event is not fully understood. Herein, we report a data-analysis of geochemistry linking magmas and source compositions. The analysis of the combined data from multiple studies ascribes the geochemistry of the OSF rocks to a combination of extensive melting of Ediacaran metasiliciclastic rocks and a Ca-rich component. It is hypothesized that fluids released by crystallization of mafic magmas contributed to partial melting of a thick metasedimentary pile represented by Ediacaran siliciclastic rocks. Such melting event gave rise to a mobile nebulite or migma, which was able to extrude and form the super-eruption or “flare-up” that characterizes Cambro-Ordovician silicic magmatism at the Gondwana margin. Fast, catastrophic crustal melting with large-scale restite entrainment, triggered by the influx of mafic magma-derived fluids, are considered the main cause of the unique features of this Cambro-Ordovician atypical silicic large igneous province of Gondwana.

Item Type:Article
Uncontrolled Keywords:Cambro-Ordovician magmatism, Ollo de Sapo Formation, Data-analysis, Geochemical modelling, Extensive crustal melting
Subjects:Sciences > Geology > Petrology
ID Code:70397
Deposited On:11 Feb 2022 15:21
Last Modified:14 Feb 2022 08:45

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