RT Journal Article
T1 Coeval interaction between magmas of contrasting composition (Late Carboniferous-Early Permian Santa Eulália-Monforte massif, Ossa-Morena Zone): field relationships and geochronological constraints
A1 Pereira, Manuel Francisco
A1 Gama, C.
A1 Rodríguez Cañas, C.
AB The Santa Eulália-Monforte massif is a post-kinematic Late Carboniferous-Early Permian calc-alkalinecomposite massif (LC-EP) located in the Ossa-Morena Zone (OMZ, Portugal). This paper examines the fieldrelationships between pinkish granites and mafic-intermediate rocks from the external ring of this massif andpresents new U-Pb zircon age determinations. The estimated 206Pb/238U ages, 297±4Ma for the pinkish graniteand 303±3Ma for a gabbro-diorite point to a short time interval between the crystallization of both magmas. Atoutcrop scale, contacts of the mafic-intermediate rocks with the host pinkish granite are sharp and corroboratethis age relationship, but do not justify why the host-enclave contacts often has curved and irregular shapes,indicating liquid-liquid interaction. A full analysis of the distribution of U-Pb zircon ages and respective Th/Uratios suggests that the compositionally distinct magmas were roughly contemporaneous. The obtained agesalso fit the LC-EP Iberian calc-alkaline suite that was formed contemporaneously to the development of theIberian-Armorican Arc and when the Paleotethyan oceanic Plate subducted under the Eurasian active margin.Taking this geodynamic setting as a reference, the LC-EP Iberian calc-alkaline magmatism can be interpretedas most probably related to the Cimmerian cycle instead of the traditionally accepted model that ascribe a closerconnection of this magmatism with the Variscan cycle.
PB Institut de Ciències de la Terra "Jaume Almera"
SN 1695-6133
YR 2017
FD 2017-12
LK http://hdl.handle.net/10272/16117
UL http://hdl.handle.net/10272/16117
LA eng
NO M. F. Pereira, C. Gama,  C. Rodríguez Cañas. Coeval interaction between magmas of contrasting composition (Late Carboniferous-Early Permian Santa Eulália-Monforte massif, Ossa-Morena Zone): field relationships and geochronological constraints. Geologica Acta, Vol.15, Nº 4, December 2017, 409-428, I-VIII. ISSN: 1695-6133, ESSN: 1696-5728,  DOI: 10.1344/GeologicaActa2017.15.4.10
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026