J. López Ruíz

Universitat Oberta de Catalunya

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José-María Cebriá

Instituto de Geociencias

Miguel Doblas

Instituto de Geociencias

Eduardo Rodríguez Badiola

Consejo Superior de Investigaciones Científicas

R. Benito García

Consejo Superior de Investigaciones Científicas

F. Rostas

Observatoire de Paris

J.-H. Fillion

Centre National de la Recherche Scientifique

S. R. Federman

University of Toledo

Roberto Oyarzun

University of Chile

L. García Cacho

Museo Nacional de Ciencias Naturales

M. Hoyos

Universidad de Panamá

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Consejo Superior de Investigaciones Científicas

Universidad Complutense de Madrid

Museo Nacional de Ciencias Naturales

Instituto de Geociencias

Centre National de la Recherche Scientifique

Observatoire de Paris

Instituto Geológico y Minero de España

Sorbonne Université

University of Arizona

Laboratoire d’Etudes du Rayonnement et de la Matière en Astrophysique et Atmosphères

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Geotermometría de rocas ígneas. Su aplicación a los basaltos alcalinos de la región volcánica del NE de España

Estudios Geológicos (1987)

J. López Ruíz José-María Cebriá

The most common geothermometers for igneous basic rocks are reviewed in the first part of the present work.In the second part, several of these geothermometers are applied to the basaltic rocks from the NE Spain region.The temperatures calculated in the principal petrologic types of this region, suggest that the olivine appears at 1240°C in the leucite-basanites; at 1230°C in the nepheline-basanites; and at 1190°C in the olivine basalts.Clinopyroxene temperatures are around 1020°C in the three petrologic types.Finally, plagioclase crystallized at lower temperatures than 1000°C, although this estimation could no.t be confirmed by the geothermometers used.Concerning the oxygen fugacity, this parameter oscillated between 10-7 . 54and 10-8 . 87atmospheres, when the olivine crystallized.

10.3989/egeol.87433-4584

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Constraints on fluids and mass transfer during high-temperature during high-temperature contact metamorphism: Marble Canyon, west Texas

Geological Society of America, Abstracts with Programs; (United States) (1992)

Lawrence M. Anovitz Robert M. Kalin J. López Ruíz

Contact metamorphism of the Hueco and Bone Springs Limestones, Marble Canyon, west Texas formed sanidinite facies assemblages near the contact. Mw + Mel + Rn + Sp lies between: 2Mo + Rn = Ak + Mw and Mw + Rn = Ak + 2[alpha]C[sub 2]S, on Sp + Ak = 3Mw + Rn + CO[sub 2], and below Sp + Rn = [alpha]C[sub 2]S + CO[sub 2]. Assuming P = 370 bars and correcting for solid solutions yields contact temperatures of 700--800 C, and 0.001 0.95. Thus there appear to have been large lateral gradients in XCO[sub 2] during metamorphism. Stable isotopic results verify the apparent differences between the two formations. Trace element data are currently only available from the Hueco Fm. REE patterns aremore » light element enriched, and show intermediate to strong Eu and distinct Ce anomalies. La/Yb ratios fall into two groups 14--65 for some samples near the contact, and 8--16 for bulk rock samples at greater distances. U concentrations are high in the skarn, low in the marble near the contact and increase with distance. Ta, W, Pb, Cs and Ba concentrations also increase with distance, although the Ta, W, and Pb depletion is concentrated within 20 cm of the contact. Transects for all of these elements, however, contains significant internal structure.« less

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Contact zone

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Late cenozoic identation/escape tectonics in the eastern Betic Cordilleras and its consequences on the Iberian foreland

Estudios Geológicos (1991)

Miguel Doblas J. López Ruíz M. Hoyos Carlos A. Martín José-María Cebriá

La estructuración del cuadrante SE de la Península Ibérica (Béticas orientales y antepaís Ibérico), desde el Messiniense hasta la actualidad, ha sido el resultado de una serie compleja de eventos deformativos, relacionados con la actividad de una megazona de cizalla NNE-SSO en el SE de las Cordilleras Béticas (zona de cizalla Trans-Alborán-Palomares; TAPSZ).La deformación a lo largo de esta zona de cizalla se caracteriza por dos escenarios secuenciales diferentes: 1) períodos de concentración de esfuerzos, asociados con un frenado momentáneo del movimiento a lo largo de la TAPSZ, y con procesos de identación dirigidos hacia el NO, y 2) períodos de disipación de esfuerzos, que serían el resultado del escape lateral de bloques en forma de cuña, y del movimiento transcurrente renovado a lo largo de la TAPSZ.Estos eventos han generado campos de esfuerzos en el antepaís Ibérico, con una serie de consecuencias tales como el vulcanismo alcalino de Calatrava y Cofrentes, zonas de protorift, modificaciones de directrices estructurales previas, levantamientos/abombamientos localizados, y cambios en el régimen sedimentario

10.3989/egeol.91473-4419

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La región volcánica mio-pleistocena del NE de España

Estudios Geológicos (1985)

J. López Ruíz Eduardo Rodríguez Badiola

ABSTRACT The mio-pleistocene volcanic rocks in the NE Spain region can be grouped into leucitebasanites, basanites s.s., olivine basalts, and trachytes, The mineralogical and ,geochemical features displayed by these rocks, together with the common ocurrence of mantle-derived inclusions, indicate their alkaline nature, as well as that many of the magmas represent primary liquids. Compositional trends and 'trace element abundances suggest that the parental magmas were originated from a homogeneous Iherzolite source, strongly enriched in incompatible elements (> 10 x the chondritic values for the highly incompatible elements and between 3-1.5 x for the moderately incompatible), in which neither kaersutite, phlogopite or apatite remained as residual phases. On the other hand, the differentiated lavas were derived from magmas produced by 10-15% partial melting of such mant1e source, that later underwent fractionation (F= 80%) of olivine + clinopyroxene + titanomagnetite, in proportion that range between 75-40%, 55-10% and 15-0%, respectively. The nature of this volcanism gives further support to independent geological and geophysical evidence indicating that the northeastern corner of the Spain -like most of the iberian mediterranean margin- has been subjected to rifting since late Oligocene-early Miocene.

10.3989/egeol.85413-4696

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La Provincia Volcánica del SE de España. Modelo Petrogenético y Contexto Geodinámico

Macla: revista de la Sociedad Española de Mineralogía (2013)

J. López Ruíz

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Tectonically-induced icehouse-greenhouse climate oscillations during the transition from the Variscan to the Alpine cycle (Carboniferous to Triassic)

BSGF – Earth Sciences Bulletin (1999)

Roberto Oyarzun Miguel Doblas J. López Ruíz José-María Cebriá Nasrrddine Youbi

Remarkable global climate oscillations were recorded during the timespan middle Carboniferous-Triassic, which allows definition of two cold (icehouse 1: middle Carboniferous; icehouse 2: early Permian) and two warm episodes (greenhouse 1: late Carboniferous-earliest Permian; greenhouse 2: middle Permian-Triassic). The tectonic evolution of the central Pangean realm from Variscan to late Variscan, and finally to early Alpine offers an explanation for these climate oscillations, in terms of mountain building, extensional collapse, rifting, epeirogeny, volcanism, erosion, and exhumation. The cold periods were associated with orogenic (icehouse 1) or epeirogenic (icehouse 2) movements leading to uplift and erosion, and therefore, to CO 2 output from the atmosphere. On the contrary, the warm periods were related to extension-related phenomena, such as volcanism, deep- and shallow-seated hydrothermal activity, unroofing of large-scale metamorphic core-complexes (greenhouse 1), or vast exhumation of coal and peat deposits and volcanism (greenhouse 2), all of them processes leading to massive input of CO 2 into the atmosphere, hence, to global warming.

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Variscan-late Variscan-early Alpine progressive extensional collapse of central Spain

Geodinamica Acta (1994)

Miguel Doblas Roberto Oyarzun Alfonso SopeÑ J. López Ruíz Ramón Capote

AbstractThe Variscan—late Variscan—early Alpine evolution of Central Spain is characterized by a progressive transition from dominant compressional conditions, towards a generalized extensional regime. This evolution involved four tectonomag-matic stages: 1) a Dl Variscan stage, associated to widespread compression with E-vergent structural elements, except to the NW, where extension and coeval plutonic activity occurred; 2) a D2 Variscan stage, characterized by increasing extension and associated massive magmatism in the center, with compression localized to the margins; 3) a D3 late Variscan stage involving a NS-directed gravitational collapse of the whole area through EW-oriented detachments, within an oval-shaped "plutonometamorphic core complex"; and, 4) a final D4 early Alpine stage characterized by EW extension, giving rise to a Basin & Range-type asymmetric rift to the E.RésuméL'histoire varisque—tardihercynienne—éo-alpine du centre de l'Espagne se caractérise par une evolution progressive depuis des conditions compressives dominantes, vers un régime extensif généralisé. Cette évolution peut s'expliquer par un modèle tectonomagmatique en quatre stades: 1) un stade varisque Dl, caractérisé par la prédominance de structures en compression à vergence E, excepté la région NW qui est soumise à une extension et une activité plutonique; 2) un stade varisque D2, associé à une importance croissante des conditions extensives et du magmatisme contemporain dans la région centrale, avec uniquement des zones marginales en compression; 3) un stade tardihercynien D3 résultant de l'effondrement gravitaire NS de cette zone par des détachements extensifs EW, donnant lieu a un "complexe central plutono-métamorphique" de forme ovale; et, 4) un dernier stade D4 eo-alpin à extension EW, pendant lequel se forme une province du type Basin & Range à l'Est.Key Words: Variscanlate Variscanearly AlpineextensioncompressionCentral SpainMots clés: VarisqueTardihercynienéo-AlpinextensioncompressionCentre de l'Espagne

Metamorphic core complex

10.1080/09853111.1994.11105255

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Citations (28)

La Region Volcánica Neogena del Sureste de España

Estudios Geológicos (1980)

J. López Ruíz Eduardo Rodríguez Badiola

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Estratigrafía, sedimentología y materias primas minerales del Neógeno de la Cuenca de Madrid

José Pedro Calvo Sorando Manuel Hoyos Gómez Jorge Morales Salvador Ordóñez Delgado Ana María Alonso‐Zarza

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Os Isotopic Compositions of Basaltic Andesites and Hawaiites of the Mexican Volcanic Belt

Mineralogical Magazine (1998)

J. López Ruíz

The east-to-west-trending Mexican volcanic belt is a complex active continental arc related to the subduction of the Rivera and Cocos plates beneath western Mexico. The basement beneath the arc is Grenville-age continental crust in eastern and central Mexico and Triassic age oceanic crust in western Mexico. Where the basement is old continental crust, the arc has large stratovolcanoes and cinder cones. In western Mexico, where the basement is young oceanic crust, the arc consists of cinder cones and fissure basalts. In western Mexico, the volcanic arc contains basaltic andesite, alkali basalt, andesite, hawaiite and mugerite. The hawaiite and mugerite are unusual rocks for continental-arc settings suggesting that both hydrous, fluid-enriched sub arc mantle and oceanic island type mantle may be present beneath western Mexico (Righter and Carmichael, 1992). Basaltic andesite and hawaiites were analysed for Re-Os isotopes in an effort to constrain the source region of their melts. The Os isotopic system is ideal for this question because the system has been shown to be robust to changes in the mantle by metasomatizing fluids, and the incompatibility of Re gives the asthenospheric and lithospheric mantle, as well as the crust, distinct Os isotopic compositions over time. Olivine and magnetite phenocrysts from basaltic andesite and hawaiites, as well as whole rocks, were analysed for their Re and Os concentrations and isotopic compositions. Osmium concentrations range from about 10 ppt for the whole-rock powders to over 500 ppt for an olivine separate. Rhenium concentrations vary from 300-500 ppt for whole-rocks and olivine separates to several parts-per-billion for magnetite-rich separates. The lS7Os/lSSOs initial isotopic ratio for basaltic andesites and hawaiite range from c. 0.15 to 0.25. The elevated isotopic composition of these rocks indicates that the primary mantle-derived magmas have been contaminated by the crust. In this region, the arc is underlain by Triassic oceanic crust and a thick sequence of Mesoproterozoic sediments derived from nuclear Mexico. The osmium data indicate that modelling of the magmatic systems in the Mexican volcanic arc in western Mexico need to take into account that the overall compositions of the primary mantle-derived magmas have been altered by the assimilation crustal components.

Andesites

Volcanic belt

10.1180/minmag.1998.62a.3.15

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