Late Variscan Santa Eulália Complex and the Nisa-Albuquerque Batholith

VII Hutton Symposium on Granites and Related Rocks, Avila, Spain, July 4-9, 201

~ 610 Ma: a critical age for the Iberian consolidation

AIMS OF THE MEETING: The scientific sessions will be focused on the Pan-African and Cadomian Orogenies recorded in North Africa and western Europe across the Ediacaran Cambrian transition and its bearing in the assembly and demise of Pannotia. Contributions dealing with structural, magmatic, provenance sources, palaeomagnetic, sedimentary, chronostratigraphic and radiometric constraints are particularly welcome. ORGANIZING COMMITTEE: J. Javier Álvaro, Instituto de Geociencias (CSIC-UCM), Spain Martim Chichorro, Universidade Nova de Lisboa, Portugal Gabriel Gutiérrez-Alonso, Universidad de Salamanca, Spain.ABSTRACT: Both the Pan-African orogenic cycle and the peri-Gondwanan Cadomian Orogeny took part in the global tectonic event that led to the rearrangement of Gondwana's west-northern block. An approach to determine the nature of Cadomian - Pan-African events using detrital zircons population from Neoproterozoic-Lower Paleozoic (rift-to-drift cycle) stratigraphic record in Iberian Massif is here discussed.info:eu-repo/semantics/publishedVersio

Analytical solution of the optimal laser control problem in two-level systems

The optimal control of two-level systems by time-dependent laser fields is studied using a variational theory. We obtain, for the first time, general analytical expressions for the optimal pulse shapes leading to global maximization or minimization of different physical quantities. We present solutions which reproduce and improve previous numerical results.Comment: 12 pages, 2 figure

Zircon dating and inheritance of a pre-Variscan granite, SW Iberia

The Portalegre pluton is an aligned series of Pre-Variscan granitoids located along the boundary of the Central Iberian/ Ossa Morena Zones (SW Iberian Massif, Portugal). Singlezircon geochronology (U-Pb SHRIMP and Pb/Pb stepwise evaporation) yield an Upper Cambrian/Lower Ordovician age (492.7 ± 3.5 Ma) interpreted as the magmatic crystallization age. The inherited zircon cores indicate the involvement of sources with a wide range age-components: an important Late Neoproterozoic (548 ± 7 Ma and c. 611-681 Ma) population and a Mesoproterozoic (c. 0.95-1.1 Ga) and older (c. 2.6 Ga) components. Younger zircon ages of 358 ± 36 and 387 ± 7 Ma were also found and interpreted as the record of a Variscan metamorphic event. The presence of Grenvillian zirconforming events in the protholiths of Portalegre granites is significant in the regional geodynamic context of the Iberian Massif (Central Iberian affinity?). At present, the Grenvillian ages are not noticeable in the Late Neoproterozoic/Early Cambrian record of the Ossa-Morena Zone, that has been correlated with West African Craton [1]. These data suggests that the Central Iberian Zone and Ossa-Morena Zone were independent peri-gondwana terrains with diferent paleogeographic affinities before the Ordovician times. The overall chemistry for the Portalegre granites shows they are very differentiated (SiO2=74-76 wt %), peraluminous (A/CNK=1.1–1.4); have low Zr=36-125ppm, Th/Ta=2-10, ΣREE= 22-134 and 1000Ga/Al >3. Their isotopic signatures (87Sr/86Sr)493=0.7050-0.7065, εNd493(-2.88 to -0.85) and δ18O=10.5-10.8‰, are compatible with partial melting of relatively young recycled metaigneous ± enriched mantle sources. The age pattern from the inherited zircon cores in the Portalegre granites shows that the late Neoproterozoic age (Cadomian) basement was actively involved in their magma generation. The Grenvillian and Archaean zircons can be accounted for by that source component but they do not imply the presence of an older pre-Neoproterozoic basement rocks beneath SW Iberia

Deciphering a multi-event in a non-complex set of detrital zircon U-Pb ages from Carboniferous graywackes of SW Iberia

The determination of U–Pb ages from detrital zircons of sedimentary rocks using LA-ICP-MS has been widely used for the purpose of provenance analysis. One problem that frequently arises is finding a population that appears to be non-complex despite several perceptible age peaks in its spectrum. These peaks are qualitatively defined by means of relative probability diagrams, or PDFs, but it is difficult to quantify their statistical significance relative to a zircon forming multi-event. Thus, can a multi-event in a non-complex set of detrital zircon U–Pb ages be deciphered and characterized? The aim of this study is to attempt to provide an answer to this question by means of statistical analysis. Its objectives are: a) to determine the best minimum number of zircon age populations (peaks), BmPs, b) for the characterization of each peak in terms of age and event duration; c) to compare the results obtained from two datasets showing similar zircon ages; and d) to demonstrate the usefulness of deciphering these BmPs. First, cluster analysis is carried out, aimed at grouping zircon ages into a set of consistent clusters. A Gaussian Kernel function is then fitted to each cluster and summed to obtain a theoretical PDFm (modeled probability density function). Finally, the selected modeled PDFm (that built on the BmPs) is that which reports the lowest number of peaks for which the difference as compared with the original gPDF (global probability density function) is equal to or below 5%. Deciphered BmP peaks can be characterized and used for characterizing and providing an understanding of related event(s). A geological interpretation, based on the results obtained, is attempted. This includes a robust measure for maximum age of deposition for both Cabrela and Mértola graywackes

Las mujeres como partícipes, usufructuarias y propietarias de negocios en la Barcelona de los siglos XVIII y XIX, según la documentación notarial

This article demonstrates the benefits of using notarial documentation to gain a fuller perspective on the role of women in business in eighteenth and nineteenth-century Barcelona. Based on these documents, this work reveals that women were active partners in familial artisanal shops, were self-employed in different kinds of business, and participated in mortgage and loan transactions. This article also incluyes three short biographics of women implied in business, in partnership or independents. Women were therefore involved in business, whether through partnership or independently. This contradicts the image of the middle-class woman as disassociated from economic life.This article proposes the need to consider wives as economically active. This was especially true of artisan women in crafts that conferred lower status and were less remunerative. It was also true of women shopkeepers, who in the census and population registers appear as devoted to "sus labores" (their duties), or other similarly vague descriptions. In fact, many different types of notarial records show that these women worked in business, whether autonomously or as partners with others.; Este artículo muestra el beneficio que aporta el uso de la documentación notarial para el conocimiento del papel de las mujeres en los negocios barceloneses, básicamente del siglo XIX pero también en el XVIII.Gracias a esta fuente, esta investigación desvela la participación de las mujeres en los negocios artesanos, permite caracterizar el trabajo autónomo femenino, descubre la presencia de las mujeres en el préstamo hipotecario y reconstruye tres trayectorias de trabajo femenino, como partícipes o autónomas. Con todo ello se contradice la imagen de la mujer de clase media desvinculada de la vida económica.El artículo concluye con la propuesta de computar como activas a las esposas de los artesanos, sobre todo las de los oficios que confieren menor estatus y son menos remunerativos, y las de los tenderos, que en los padrones constan bajo el epígrafe de "sus labores" u otros parecidos, ya que la documentación notarial pone en evidencia que este tipo de mujeres trabajaban autónomamente o participaban plenamente en el negocio familiar