Results 21 to 30 of about 1,870 (164)

Interacción piedra-ambiente, 1ª parte: formas de alteración desarrolladas sobre la piedra de la catedral de Burgos

Informes de la Construccion, 1994
Se realiza la descripción e inventario de las principales formas de alteración desarrolladas sobre la caliza de Hontoria, empleada en la construcción de la Catedral de Burgos, aportando una exhaustiva información gráfica de las mismas, así como de su ...
F. J. Alonso, F. Díaz-Pache, R. María Esbert   +2 more
doaj   +1 more source

Application of the fluorescence light microscopy in the textural study of portland cement clinker

Materiales de Construccion, 1987
The application of fluorescence light microscopy in the textural study of Portland cement clinker, specially its porosity, is presented. Principles and types of the technique are commented and the suggested sample preparation method is described. The use
Ángel Rodríguez Rey, Modesto Montoto San Miguel, Lope Calleja Escudero, Vicente Gómez Ruiz de Argandoña, Luis Miguel Suárez del Río   +4 more
doaj   +1 more source

Development of CCMb: A Low‐Mg Calcite Reference Material for In Situ Measurement of δ18O, δ13C and Selected Trace Elements

Geostandards and Geoanalytical Research, EarlyView.
Key Points Low‐Mg calcite RM developed for in situ microanalysis applications in palaeoclimatology (δ18O, δ13C; Mg, Sr m/m). New data for calcite CRM IAEA‐603 (δ18O, δ13C by SIMS and GS‐IRMS; Mg m/m). No detectable IMF effect of Mg on SIMS δ18O determinations for mass fractions < 3650 μg g‐1.
Andreas T. Hertwig, Maciej G. Śliwiński, Irene Cantarero, Richard A. Stern, Carles Fàbrega, Jakub T. Śliwiński, Thomas Ludwig, František Majs, William Nachlas, John H. Fournelle, Xavier Llovet, Rachelle B. Turnier, David Parcerisa, Anna Travé   +13 more
wiley   +1 more source

Laboratory studies on the consolidation and protection of calcareous materials in the Cathedral of Oviedo. Part I

Materiales de Construccion, 1987
The suitability of some consolidating and protecting products, to be applied to the deteriorated calcareous stones of the Cathedral of Oviedo, is presented. A proposed procedure and methodology for evaluating that suitability is also described.
Rosa M. Esbert, Carlota Grossi, Rosa M. Marcos   +2 more
doaj   +1 more source

Provenance and Petrological Evolution of Sand Injection Complexes: Insights From Heavy Mineral Analysis in the Paleogene Forearc Succession of the San Joaquin Basin

Basin Research, Volume 38, Issue 3, May–June 2026.
The study of heavy mineral assemblages with statistical analysis resolves provenance signatures and quantifies syn‐emplacement modification of sand injection complexes. Results demonstrate transformative petrological processes, including density‐dependent hydraulic sorting and mechanical grain degradation.
Gustavo Zvirtes, Andrew Morton, Andrew Hurst, Ruy Paulo Philipp, Wiktor Luzinski, Giuseppe Palladino, Luciano Alessandretti   +6 more
wiley   +1 more source

Braincase anatomy and palaeoneurology of Venetoraptor gassenae, a lagerpetid pterosauromorph from the Late Triassic of southern Brazil

Palaeontology, Volume 69, Issue 2, 2026.
Abstract There is a growing consensus that pterosaurs and the flightless Lagerpetidae are closely related. This relationship is supported by apomorphies throughout the skeleton, including endocranial character states such as a well‐developed floccular fossa and a tall anterior semicircular canal. Our knowledge of lagerpetid anatomy has been improved by
Lísie V.S. Damke, Leonardo Kerber, Mario Bronzati, Maurício S. Garcia, Martín D. Ezcurra, Sterling J. Nesbitt, Rodrigo T. Müller   +6 more
wiley   +1 more source

Mineralogía de arcillas y grado de diagénesis del Cretácico inferior, en el flanco sur del anticlinorio de Bilbao

Estudios Geologicos, 1993
El Cretácico inferior del Anticlinorio de Bilbao está constituido por un potente conjunto de materiales sedimentarios, que tradicionalmente se ha organizado mediante tres sistemas de referencia: Wealdense, Urgoniano y Supraurgoniano.
J. Arostegui, F. Nieto, M. Ortega-Huertas, F. Velasco, M. C. Zuluaga   +4 more
doaj   +1 more source

Templated Tube Growth About a Reactive Gas Plume: The Pharaoh's Serpent Reaction, Thermodecomposition of Mercury Thiocyanate in Air

ChemSystemsChem, Volume 8, Issue 1, January 2026.
XX XX ABSTRACT The pharaoh's serpent reaction, the thermodecomposition of mercury thiocyanate in air, is a classic chemical demonstration. We analyse and characterize the reaction products, composed of two different phases, graphitic carbon nitride, C3${\rm C} _3$N4${\rm N} _4$, and metacinnabar, HgS.
Carlos Pimentel, Sergio Testón‐Martínez, Carlos Gutierrez‐Ariza, C. Ignacio Sainz‐Díaz, Julyan H. E. Cartwright   +4 more
wiley   +1 more source

Evolución geoquímica de las salmueras de las Lagunas de Monegros (Zaragoza, España) y análisis del equilibrio de la halita

Estudios Geologicos, 1992
El análisis estadístico de los datos geoquímicos de concentración en una serie de muestras recogidas durante un período superior a un año en la laguna de La Playa en Los Monegros (Zaragoza), ha mostrado discontinuidades representativas de la falta de ...
I. Garcés, J. M. Tena, L. Auqué, J. Mandado, M. J. Gimeno   +4 more
doaj   +1 more source

Palagonitization of Volcanic Rocks in Polar Climates: The Case of Deception Island (Antarctica)

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 12, December 2025.
Abstract A detailed study of palagonitization in rocks from Deception Island—one of Antarctica's most active volcanoes—has been performed to advance our understanding of this alteration process. A detailed petrographic (optical and SEM), mineralogical (XRD), and mineral and glass spot geochemistry (EDS and EMP) characterization has been conducted on ...
Oriol Vilanova‐Pagès, Guillem Gisbert, Helena Albert, Adelina Geyer, Meritxell Aulinas, Raquel Arasanz, Jordi Ibañez‐Insa, Antonio Polo‐Sánchez, Antonio Álvarez‐Valero, Olga Prieto‐Ballesteros, Santiago Giralt   +10 more
wiley   +1 more source