Tectonostratigraphy of the Mérida Massif reveals a new Cadomian suture zone exposure in Gondwana (SW Iberia)
| Autor: | Rubén Díez Fernández, José Manuel Fuenlabrada, Ricardo Arenas, Sonia Sánchez Martínez, Esther Rojo-Pérez |
|---|---|
| Přispěvatelé: | Ministerio de Economía, Industria y Competitividad (España), Díez Fernández, Rubén, Arenas, Ricardo, Rojo-Pérez, E., Sánchez Martínez, Sonia, Fuenlabrada, J.M., Díez Fernández, Rubén [0000-0002-0379-7970], Arenas, Ricardo [0000-0002-8229-4836], Rojo-Pérez, E. [0000-0001-5780-6417], Sánchez Martínez, Sonia [0000-0003-0826-5313], Fuenlabrada, J.M. [0000-0001-6687-8631] |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Variscan tectonics
geography geography.geographical_feature_category 020209 energy Continental crust Cadomian tectonics Cadomian Orogeny Geology Orogeny 02 engineering and technology Massif Ophiolite SW Iberian Massif 010502 geochemistry & geophysics 01 natural sciences Paleontology Gondwana 0202 electrical engineering electronic engineering information engineering Suture zone Suture (geology) 0105 earth and related environmental sciences Terrane |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | [EN] Neoproterozoic and Palaeozoic rocks of the Mérida Massif (SW Iberia) have been grouped into tectonostratigraphic units. Each unit is separated from the rest ones by either crustal-scale thrusts and/or extensional detachments. The lowermost unit (Magdalena Gneisses; lower plate) has continental crust affinity, and rest below a mafic-ultramafic ensemble, referred to as the Mérida Ophiolite (suture zone). The Serie Negra Group constitutes a unit with continental crust affinity (Upper Schist-Metagranitoid Unit; upper plate) located on top of the Mérida Ophiolite. A carbonate-rich succession (Carija Unit) occupies the uppermost structural position. Structural and previous isotopic data suggest that this suture zone was formed during the Cadomian Orogeny. Superimposed shortening during the late Palaeozoic formed upright to NE-verging folds and thrusts that affected this suture zone and juxtaposed it onto Ordovician strata during the Variscan Orogeny. The Mérida Ophiolite represents a new Cadomian suture zone exposure in the Gondwanan realm of the Iberian Massif, but its root zone is yet to be identified. This ophiolite shares a far-travelled nature with other Cadomian and Variscan suture zone exposures in Iberia, making the latter a piece of lithosphere built through inland transference of allochthonous terranes from peri-Gondwana onto mainland Gondwana during the Neoproterozoic-Cambrian and the Devonian-Carboniferous periods. This work was supported by the Ministerio de Economía, Industria y Competitividad under Grant CGL2016-76438-P. |
| Databáze: | OpenAIRE |
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