Journal of Iberian Geology 

About: Journal of Iberian Geology is an academic journal published by Servicio de Publicaciones. The journal publishes majorly in the area(s): Geology & Cretaceous. It has an ISSN identifier of 1698-6180. Over the lifetime, 494 publications have been published receiving 6657 citations. The journal is also known as: Journal of Iberian Geology & Cuadernos de Geología Ibérica.

The lead and copper isotopic composition of copper ores from the Sierra Morena (Spain)

Abstract: The paper presents lead and copper isotope analyses of 51 copper ore samples from the Sierra Morena, South of Spain. They are from ancient mines of the Iberian Peninsula collected by Claude Domergue during various field campaigns in the central Sierra Morena from 1965 to 1975. Most samples consist of copper oxide minerals such as malachite, azurite and chrysocolla and stem from the surficial sections of the ore deposits. The aim of the study was to supplement the existing reference data bank on lead isotopic compositions of ancient copper mines from the Iberian Peninsula. This is particularly important for the Sierra Morena for which data exist mostly for lead-zinc but not for copper ores. The lead isotope ratios range from 18.165 to 19.712 (206Pb/204Pb), 0.797 to 0.859 (207Pb/206Pb) and 1.955 to 2.108 (208Pb/206Pb). Two separate fields can be distinguished with a major field intermediate between the ore deposits from SW and SE Spain and a second at higher 208Pb/206Pb values. Copper isotopes were analysed additionally to provide further constraints for provenance studies. The copper isotope ratios δ65Cu of the copper oxide samples are mostly positive and higher on average than those of sulphide minerals. They are a potential tool to distinguish between either sulphide ore or oxide ore deposit derived artefacts.

Villafranchian large mammals from the Iberian Peninsula: paleobiogeography, paleoecology and dispersal events

Abstract: The Pleistocene of the Iberian Peninsula is currently a focus of intense paleontological, archaeological and geological research. To a large extent, these inquiries are intended to decipher the ecological factors that might have conditioned early Homo dispersals into the European continent during the late Early Pleistocene. In this respect, the research carried out during the last twenty years in several areas of the Iberian Peninsula (the Guadix-Baza Basin, the Sierra de Atapuerca, the Vallparadis Section and the Banyoles-Besalu Basin) have yielded a large amount of new significant data. Here we review such data and provide for the first time a comprehensive synthesis from a faunal, geologi­cal and paleoecological perspectives, by focusing on the relationship between paleoenvironmental conditions and early human dispersals during the late Early Pleistocene in the Iberian Peninsula. In particular, the Iberian fossil record of Early to Late Villafranchian large mam­mals is synthesized, on the basis of recent publications and unpublished data collected by the authors during the last five years, in order to provide the adequate faunal and paleocological framework for understanding the factors that limited or conditioned human dispersal events.

The Quaternary Active Faults Database of Iberia (QAFI v.2.0)

Abstract: The Quaternary Active Faults Database of Iberia (QAFI) is an initiative lead by the Institute of Geology and Mines of Spain (IGME) for building a public repository of scientific data regarding faults having documented activity during the last 2.59 Ma (Quaternary). QAFI also addresses a need to transfer geologic knowledge to practitioners of seismic hazard and risk in Iberia by identifying and characterizing seismogenic fault-sources. QAFI is populated by the information freely provided by more than 40 Earth science researchers, storing to date a total of 262 records. In this article we describe the development and evolution of the database, as well as its internal architecture. Additionally, a first global analysis of the data is provided with a special focus on length and slip-rate fault parameters. Finally, the database completeness and the internal consistency of the data are discussed. Even though QAFI v.2.0 is the most current resource for calculating fault-related seismic hazard in Iberia, the database is still incomplete and requires further review.

Overview of laboratory methods employed for obtaining diffusion coefficients in FEBEX compacted bentonite

Abstract: Este trabajo describe las principales metodologias empleadas para obtener parametros de difusion en arcillas compactadas, asi como las soluciones analiticas que pueden usarse dependiendo de la configuracion experimental y de las condiciones iniciales y de interaccontorno. Cada metodo tiene diferentes ventajas y limitaciones, en funcion del tipo de elemento estudiado: neutro, anionico o cationico. Las especies neutras, como el tritio (HTO), no interactuan con el solido y usan toda la porosidad para el transporte difusivo; los elementos anionicos, como el cloro, tampoco se adsorben, pero sufren exclusion anionica. La difusion de los elementos cationicos se ve retardada por la existencia de sorcion. Para describir como determinar los parametros de difusion (coeficientes de difusion aparente, Da, efectivo, De, y porosidad accesible) se utilizan numerosos ejemplos de ensayos de difusion realizados con la bentonita espanola FEBEX. Se obtuvieron el coeficiente de difusion aparente del tritio, cloruro, yoduro, sulfato, cesio, uranio, estroncio, selenio, renio y europio. Se determino el coeficiente de difusion efectivo del tritio, cloruro, yoduro, sulfato, cesio, uranio, estroncio, selenio, tecnecio, sodio y calcio. Asimismo, se obtuvo la porosidad accesible para el tritio, cloruro, yoduro y sulfato. En particular, el comportamiento frente a la difusion del HTO y Cl-, se estudio en funcion de la densidad seca de la bentonita. Tanto el coeficiente de difusion efectivo como el aparente muestran un descenso exponencial al aumentar la densidad seca, mas pronunciado en el caso del Cl-. Se encontro, que la porosidad accesible para el HTO es igual a la porosidad total. En el caso del cloruro (y otros aniones) solo una muy pequena parte de la porosidad total, a la densidad de compactacion utilizada para un almacenamiento, es accesible al transporte por difusion. En este trabajo se presenta un resumen de todos los resultados experimentales obtenidos con la bentonita FEBEX.

Active Tectonics of the Pyrenees: a review

Abstract: The Pyrenees have experienced at least seven earthquakes with magnitude M > 5 in the last 400 years. During the last decades, several seismotectonic, neotectonic and paleoseismological studies have focused on identifying the main active structures of the areas experiencing damaging earthquakes. In spite of these studies, the regional stress regime is still discussed and there is no unequivocal seismotectonic model at the scale of the range. In this paper, we first present a revision of the former works on active faults in the Pyrenees, and then we discuss the main results in terms of their neotectonic setting. We have distinguished five neotectonic regions according to their seismicity, faulting style and morphologic evolution: the westernmost Pyrenees, the North Western Pyrenean zone, the Foreland basins, the Lower Thrust Sheets Domain and the Eastern Pyrenees. This review lead us to differentiate the range into two major domains: the High Chain, where active faults are controlled by vertical maximum stresses, and the Low Chain, where horizontal maximum stresses of variable orientation seem to be dominant. We propose that these different stress domains are related to the isostatic rebound in response to either the difference in crustal thickness and/or the distribution of the Plio-Quaternary erosion.