Docta Complutense
Open Access Institutional Repository of the Complutense University of Madrid, that compiles scientific production to promote the visibility and impact of Complutense research.
With the collaboration of the Ministerio de Ciencia e Innovación and the Spanish Foundation for Science and Technology (FECYT).
Recent Submissions
P-T evolution of HP migmatitic paragneiss from the Beni Bousera metamorphic unit (internal Rif, Northern Morocco) constrained by phase equilibria modelling and melt reintegration
(International Geology Review, 2024) Essoualeh, Oumaima; Aghzer, Abdel Mouhsine; Afiri, Abdelkhaleq; Abati Gómez, Jacobo; El Mostadi, Abdelfettah; Benchekroun, Fouad
The high-pressure (HP) migmatitic paragneiss of the Beni Bousera metamorphic unit (BBMU) from the Beni Bousera Massif underwent granulite-facies metamorphism. They mainly consist of garnet, biotite, kyanite, sillimanite, cordierite, spinel, quartz, plagioclase, K-feldspar, rutile, ilmenite and graphite. These minerals form a sequence of metamorphic assemblages corresponding to five metamorphic events (M1, M2, M3, M4, and M5). The first three events correspond to a latest Carboniferous-earliest Permian metamorphic evolution, while the last two are retrograde and Alpine in age. The p-T conditions of these metamorphic events were estimated using pseudosection calculations in the MnNCKFMASTHO system. Following prograde stage conditions of 9.3–10.9 kbar and 630–665°C (M1 stage), the p-T evolution culminates in melting of the paragneiss which occurred mainly at HP conditions, within the kyanite stability field, at 11.8–14.2 kbar and 820–845°C (M2 pressure-peak); anatexis then continued at high to medium pressure (HMP), within the sillimanite stability field, at 9.9–11 Kbar and 840–860°C (M3 thermal-peak), accompanied by the production of very small proportions of melt. The prograde p-T segment of the inferred clockwise path is characterized by a pressurization related to a post-Variscan collisional event triggered by the closure of the Paleotethys Ocean, and is followed by the exhumation of the granulitic unit to mid-crustal depth, with slight coeval heating. The retrograde Alpine evolution is coeval with the final exhumation of the migmatitic paragneiss and underlying peridotites during back-arc extension related to the westward retreat of the Alpine subduction. It occurred under sub-solidus conditions from 9.5–10.7 kbar and 818–848°C (M4) to 4.9–5.85 kbar and 710–785°C (M5) and corresponds to a near-isothermal and strongly decompressive metamorphic evolution (ΔP ≈ 5 Kbar).
The Role Of Geosciences And Landscape In The Management Of Natural Parks Of Guadalajara (Central Spain): In Search Of Suitable Applications
(WIT transactions on ecology and the environment, 2006) García Quintana, Álvaro; Abad, M. P.; Aguilar, M.; Alcalá, L.; Barrera Martínez, Ildefonso; Cebrián, M.; Fernández de Villalta, M.C.; Martín Duque, José Francisco; Martín-Loeches Garrido, Manuel; Solís, A.
University professors, researchers and professionals from different governmental bodies in Madrid and Guadalajara have formed a research group to investigate how to use geo-environmental information in the management of Spanish Natural Parks. Funding has been obtained from the Spanish Ministry of Science and Technology. The pilot area for the project is the Natural Parks of the province of Guadalajara in the Castilla – La Mancha Autonomous Region. This article describes two proposals to analyse the physical environment and the landscape of the natural parks of Guadalajara: analytical-parametric inventory, and synthetic-physiographic inventory. The objective is to provide useful information on how to manage these areas. Additionally, the article includes results of the study of active karstic processes in two of these natural parks, Río Dulce and Alto Tajo.
Harvested by
