Results 201 to 210 of about 1,016,504 (237)

Miocene silcretes in argillaceous playa deposits, Madrid Basin, Spain: petrological and geochemical features

Sedimentology, 2000
Four regressive sequences are present in the opaline rocks and related deposits of the Miocene Intermediate Unit of the Madrid Basin. The sequences consist of silty mudstones and argillaceous opals, separated by transitional facies. The silty mudstone consists mainly of dioctahedral smectites, whereas the argillaceous opal is principally opal‐CT and ...
Bustillo, M.A., Bustillo Revuelta, Manuel   +1 more
openaire   +4 more sources

Isotopic paleoecology of mammals and the Middle Miocene Cooling event in the Madrid Basin (Spain)

Palaeogeography, Palaeoclimatology, Palaeoecology, 2012
Abstract The Middle Miocene underwent profound climatic perturbations detected in worldwide marine and continental records. The Miocene Climatic Optimum (~ 17 to 14 Ma), a warm and humid period, was followed by the Middle Miocene Cooling (~ 14–13.8 Ma) characterized by a sharp drop in temperatures and an increase in aridity triggered by the ...
Laura Domingo, Paul L. Koch, Stephen T. Grimes, Jorge Morales, Nieves López-Martínez   +4 more
openaire   +2 more sources

Early evidence of continental aridity and open-habitat grasslands in Europe as revealed by the Middle Miocene microflora of the Madrid Basin

Palaeogeography, Palaeoclimatology, Palaeoecology, 2021
In this study we present a new, extensive palaeobotanical and palaeoclimatic record from 85 microfloral assemblages of Middle Miocene (late Langhian–early Serravallian) age recovered from ten localities in the Madrid Basin.
Manuel Casas‐Gallego, J. Postigo-Mijarra, M. R. Rivas-Carballo, M. F. Valle-Hernández, J. M. Pablos, E. Barrón   +5 more
semanticscholar   +1 more source

Approach to the trace element geochemistry of non-marine sepiolite deposits: Influence of the sedimentary environment (Madrid Basin, Spain)

Applied Clay Science, 2016
M. Pozo, M. Carretero, E. Galán
semanticscholar   +3 more sources

The Madrid Basin aquifer: Preliminary isotopic reconnaissance

Journal of Hydrology, 1981
Abstract Lopez Vera, F., Lerman, J.C. and Muller, A.B., 1981. The Madrid Basin aquifer: preliminary isotopic reconnaissance. In: W. Back and R. Letolle (Guest-Editors), Symposium of Geochemistry of Groundwater —26th International Geological Congress. J. Hydrol., 54: 151ndash;166.
Fernando López Vera, Juan Carlos Lerman, Anthony B. Muller   +2 more
openaire   +1 more source

Recharge and salinization in the Madrid Basin

Environmental Geology, 1993
The purpose of this work was to reinvestigate the existing hydrogeological conceptual model of the basin of Madrid, Spain. A cumulative chemical isotopic diagram which enabled the distinction between different groups of water as well as calculation of the mode of their blending was used for this investigation.
A. S. Issar, R. M. Llamas, I. Herraez
openaire   +1 more source

Multi-stream order analyses in basin asymmetry: A tool to discriminate the influence of neotectonics in fluvial landscape development (Madrid Basin, Central Spain)

Geomorphology, 2008
J. Garrote, G. Heydt, R. Cox
semanticscholar   +3 more sources

Ground‐Water Age Distribution in Madrid Basin, Spain

Groundwater, 1982
ABSTRACT The alluvial deposits that occupy the Madrid Basin in central Spain form an aquifer system covering an area of 5,000 km 2 (2,000 mi 2 ) and with thicknesses of 2,000 m (6,600 ft) or more. Average annual precipitation is 500 mm
M. Ramon Llamas, Eugene S. Simpson, Pedro E. Martinez Alfaro   +2 more
openaire   +1 more source

Microwave assisted acid treatment of kerolitic clays from the Neogene Madrid Basin (Spain) and its use in CO2 capture processes

, 2020
The effect of the microwave assisted acid treatment on five kerolite-Mg-stevensite samples from the Neogene Madrid Basin was studied. Samples with lower amount of kerolite are more prone to suffer chemical modifications thought the microwave assisted ...
F. Franco, J. A. Cecilia, M. Pozo, Laura Pardo, E. Bellido, C. García‐Sancho   +5 more
semanticscholar   +1 more source

Hydrothermal stability of saponitic clays from the Madrid Basin

Applied Clay Science, 1994
The hydrothermal stability of sedimentary saponites from the Madrid Basin in Spain has been investigated in the laboratory. Their usefulness as physico-chemical barriers for high-level radioactive waste repositories was determined. The study focussed on the adsorption and fixation of K+ because the uptake of this cation is known to influence the ...
J. Cuevas, S. Leguey, R. Pusch
openaire   +1 more source