Results 21 to 30 of about 1,330 (116)

La erupción de El Charco de 1712 (Cumbre Vieja, La Palma). Nuevas aportaciones petrográficas y mineralógicas.

open access: yesGeogaceta
La erupción volcánica de 1712, de El Charco, es una de las peor conocidas de las 8 erupciones históricas de la isla de La Palma. Fue un evento principalmente estromboliano, con fases hidromagmáticas, durante el cual se abrieron múltiples bocas a lo ...
Nicolás Chicharro   +3 more
doaj   +1 more source

Reactivity of laser-cleaned stones to a SO2 ageing test

open access: yesMateriales de Construccion, 2004
In order to study the reaction or susceptibility of Nd:YAG laser cleaned stones to polluted atmospheres, several types of stone, both cemented (limestone) and crystalline (marble, granite), were exposed to an atmosphere having simulated SO2 pollution ...
F.J. Alonso   +3 more
doaj   +1 more source

Magnetic and gamma-ray spectrometric airborne geophysical data for investigating potential mineral resources and generating geoscientific knowledge in Colombia

open access: yesBoletín Geológico, 2021
The Servicio Geológico Colombiano has made available several airborne magnetometry and gamma-ray spectrometry datasets. The information was acquired in 15 blocks that cover approximately 520,000 square  kilometers of Colombian territory, representing ...
Ismael Enrique Moyano Nieto   +10 more
doaj   +1 more source

El corte de rocas ornamentales con discos diamantados: influencia de las características petrográficas de la roca

open access: yesMateriales de Construccion, 1998
This paper follows another one published in the preceding number of this same journal, that reviewed some scientific papers on the influence of the factors of the cutting equipments (machinery, cutting characteristics, disks, etc) on the efficiency of ...
A. Rodríguez-Rey   +3 more
doaj   +1 more source

Methane and Nitrous Oxide Reshape the Air‐Water Greenhouse Gas Budget of a Tropical Estuarine Delta

open access: yesJournal of Geophysical Research: Biogeosciences, Volume 131, Issue 7, July 2026.
Abstract Estuaries are important sources and sinks of greenhouse gases (GHGs), yet assessments of their radiative balance often focus primarily on carbon dioxide (CO2), with less attention given to methane (CH4) and nitrous oxide (N2O). We combine measurements of CH4 and N2O air‐water fluxes with concurrent CO2 data in a tropical estuarine delta ...
Luiz C. Cotovicz Jr.   +6 more
wiley   +1 more source

Análisis comparativo de los valores K (T) para el equilibrio cuarzo/solución de 0 a 100 ºC según los calibrados geotermométricos y las funciones utilizadas en programas de modelización geoquímica

open access: yesEstudios Geologicos, 1990
El estudio de sistemas geotermales es abordado en la actualidad mediante la utilización de técnicas geotermométricas clásicas de manera interactiva con otras más complejas de modelización termodinámica por ordenador.
J. M. Tena   +4 more
doaj   +1 more source

Fault‐Mediated Groundwater‐Surface Water Mixing Amplifies Hydrochemical/Hydrological Dynamics in a Semi‐Arid Volcanic Lake Basin

open access: yesHydrological Processes, Volume 40, Issue 5, May 2026.
Isotopes data help to understand the GW‐SW connectivity, the recharge elevations, and evaporation in a volcanic lake basin. ABSTRACT Understanding groundwater (GW) to surface water (SW) connectivity (i.e., the exchange of water and solutes between aquifers and surface bodies) is increasingly important under changing climate conditions, where ...
L. Ramírez‐González   +9 more
wiley   +1 more source

Paleosuelos de sepiolita en el neógeno de la cuenca de Madrid

open access: yesEstudios Geologicos, 1989
El análisis de la composición mineral de materiales arcillosos con sepiolita, pone de manifiesto variaciones significativas en el contenido de este mineral, con respecto a esmectitas e illitas, minerales terrígenos (cuarzo y feldespato) y carbonatos ...
S. Leguey, M. Pozo, J. A. Medina
doaj   +1 more source

Bromelicolous Habit and Phoresy of Ostracoda in a Species of Treefrog From the Brazilian Cerrado

open access: yesAustral Ecology, Volume 51, Issue 5, May 2026.
ABSTRACT Some plants develop phytotelmata, specialized structures that retain water and form small aquatic ecosystems harbouring diverse organisms. Bromeliads (Bromeliaceae) are classic examples, as their leaf axils provide suitable habitats for bacteria, algae, protozoa, invertebrates and vertebrates, including anurans.
Ubiratã Ferreira Souza   +5 more
wiley   +1 more source

Caracterización geoquímica de la ruptura sedimentaria entre los yesos de la unidad salina e intermedia de la cuenca de Madrid

open access: yesEstudios Geologicos, 1989
En el Terciario de la Cuenca de Madrid existen dos unidades sedimentarias de carácter yesífero. Ambas unidades están constituidas por yesos con diferentes características, aunque su separación es dificil en diversos afloramientos debido a intensos ...
S. Ordóñez, R. Fort, M. Bustillo
doaj   +1 more source

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