Results 41 to 50 of about 1,330 (116)

Inorganic carbon dynamics and their relation to autotrophic community regime shift over three decades in a large, alkaline river

Limnology and Oceanography, Volume 70, Issue 5, Page 1122-1136, May 2025.
Abstract How much of the excess CO2 in running waters comes from in‐stream respiration of organic carbon? To answer this, we developed a 30‐yr metabolism‐carbonate system database at an hourly resolution for the Loire River, France, a large, alkaline river.
Jacob S. Diamond, An Nguyen Truong, Gwenaël Abril, Enrico Bertuzzo, Vincent Chanudet, Raphael Lamouroux, Florentina Moatar   +6 more
wiley   +1 more source

Marcadores geoquímicos na distinção estratigráfica e suas aplicações em geomorfologia

Revista de Geografia (Recife)
A geoquímica focada na paisagem surgiu na Rússia na metade do século XX, visando entender a dinâmica das formações superficiais por meio da análise de elementos químicos.
Daniel Rodrigues de Lira, Antonio Carlos de Barros Corrêa, José Danilo da Conceição Santos, Drielly Naamaa Fonseca   +3 more
doaj   +1 more source

Variación de 13C en el ambiente de Madrid (atmósfera, aguas superficiales y aguas subterráneas)

Estudios Geologicos, 1995
Se analizan el 13C de la atmósfera, ríos y pozos del área de Madrid, al objeto de evaluar su distribución y origen, mediante adaptación y desarrollo de técnicas de muestreo y análisis. Las muestras atmosféricas presentan valores de δ13C situados entre -9,
F. López Vera, J. J. Tejado, E. Fabián, C. Gómez Artola, R. Redondo   +4 more
doaj   +1 more source

Rift‐Related Low‐Pressure–High‐Temperature Granulite Facies Metamorphism Generates Widespread Peraluminous Crustal Melts: Evidence From the Early Jurassic Mexican Crust

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 5, May 2025.
Abstract High heat fluxes occurring in rift settings are expected to generate partially melted low‐pressure–high‐temperature granulites (LP–HTG). Therefore, studying these rocks can offer valuable insights into crustal reworking during extension. However, our interpretations are limited by the rarity of LP–HTG in the metamorphic record.
Anthony Ramírez‐Salazar, Mattia Parolari, Arturo Gómez‐Tuena, Fernando Ortega‐Gutiérrez, Mariano Elías‐Herrera   +4 more
wiley   +1 more source

Relaciones entre porosidad, contenido en arcillas y durabilidad de areniscas

Materiales de Construccion, 1985
The petrographical characterization of three spanish sandstones from Villamayor (Salamanca), Somió and Tazones (Asturias) is presented. The significance of the percentage and type of the clay minerals cementing the grains on the pore system geometry, for
R. M. Esbert, J. Ordaz, L. Valdeón
doaj   +1 more source

Sargassum beaching on mangrove sediments shifts microbial and crab metabolisms and enhances blue carbon storage

Limnology and Oceanography, Volume 69, Issue 12, Page 2941-2953, December 2024.
Abstract Benthic metabolism and net carbon accumulation in mangroves sediments strongly depend on the quantity and quality of organic matter (OM) supplied, including material brought by coastal waters such as the macroalgae Sargassum spp. Mesocosms were used to assess the effect of eutrophication by Sargassum on mangrove sediments. The concentration of
Mathias Chynel, Gwenaël Abril, Mélissa Narayaninsamy, Loris Deirmendjian, Frédéric Guérin, Charlotte Dromard, Tarik Meziane   +6 more
wiley   +1 more source

Comportamiento geoquímico de las formaciones salinas bajo el efecto de la temperatura y la irradiación

Estudios Geologicos, 1993
La generación de defectos cristalinos y la migración de las fases fluidas (salmueras y gases), son los efectos más relevantes de la irradiación y la temperatura sobre una formación salina, susceptible de albergar un almacenamiento de residuos radiactivos.
C. de las Cuevas, L. Miralles, P. Teixidor, J. García Veigas, J. J. Pueyo   +4 more
doaj   +1 more source

Patterns of Plio‐Pleistocene Ice Volume Variability Recorded by the Large‐Magnitude Explosive Eruptions From the Kamchatka‐Kurile Volcanic Arc

Geochemistry, Geophysics, Geosystems, Volume 25, Issue 10, October 2024.
Abstract Marine fallout ash beds can provide continuous, time‐precise records of highly explosive arc volcanism that can be linked with the climate record. An evaluation of revised Plio‐Pleistocene (0–4 Myr) tephrostratigraphies from Ocean Drilling Program Sites 881, 882, and 884 confirms cyclicity of the Kamchatka‐Kurile arc volcanism and a marked ...
Susanne M. Straub, Brendan Reilly, Maureen E. Raymo, Arturo Gómez‐Tuena, Kuo‐Lung Wang, Elisabeth Widom, David Kuentz, Richard J. Arculus   +7 more
wiley   +1 more source

Variabilidad textural, mineralógica y geoquímica de la bentonita de Yuncos (Cuenca de Madrid)

Estudios Geologicos, 1993
En este trabajo se estudia la variabilidad composicional (mineralógica y geoquímica) y textural de la capa principal de bentonita (saponita) del depósito de Yuncos (Toledo), en el sector suroccidental de la cuenca de Madrid.
M. Pozo, J. A. Medina, J. Casas, A. Moreno   +3 more
doaj   +1 more source

Soil development and ancient Maya land use in the tropical karst landscape: Case of Busiljá, Chiapas, México

Soil Science Society of America Journal, Volume 88, Issue 5, Page 1561-1582, September/October 2024.
Abstract The soil mantle of the tropical karstic landscapes of Southern Mexico was shaped by specific processes of pedogenesis and long‐term human impacts of ancient Maya agriculture. To understand the interaction between natural and human‐induced soil‐forming processes in the calcareous mountains of Chiapas state, we studied soil toposequences around ...
P. García‐Ramírez, K. Guillén, S. Sedov, C. Golden, S. Morell‐Hart, A. Scherer, T. Pi, E. Solleiro‐Rebolledo, H. Dine, Y. Rivera   +9 more
wiley   +1 more source