Geologica acta

Geologica acta 7 records found  Search took 0.01 seconds. 
1.
18 p, 1.8 MB Distribution, morphology and habitats of saline wetlands : a case study from Monegros, Spain / Castañeda, C. (Consejo Superior de Investigaciones Científicas (Espanya). Estación Experimental de Aula Dei) ; Herrero, J. (Consejo Superior de Investigaciones Científicas (Espanya). Estación Experimental de Aula Dei) ; Conesa, J.A. (Universitat de Lleida. Departament d'Hortofruticultura, Botànica i Jardineria)
Wetlands in semiarid regions have received less attention than wetlands in humidtemperate areas, and the limited amount of information has resulted in little regulatory recognition. A comprehensive map of the saline wetlands that occur in karstic depressions in the semiarid region of Monegros, NE Spain, was developed from historical data, topography, and surveys of vascular flora. [...]
2013 - 10.1344/105.000002055
Geologica acta, Vol. 11, Núm. 4 (December 2013) , p. 371-388  
2.
19 p, 3.0 MB Hydrogeochemical characterization of an evaporite karst area affected by sinkholes (Ebro Valley, NE Spain) / Acero Salazar, Patricia (Universidad de Zaragoza. Departamento de Ciencias de la Tierra) ; Gutiérrez, F. (Universidad de Zaragoza. Departamento de Ciencias de la Tierra) ; Galve, J.P. (Universidad de Zaragoza. Departamento de Ciencias de la Tierra) ; Auqué, L.F. (Universidad de Zaragoza. Departamento de Ciencias de la Tierra) ; Carbonel, D. (Universidad de Zaragoza. Departamento de Ciencias de la Tierra) ; Gimeno, M.J. (Universidad de Zaragoza. Departamento de Ciencias de la Tierra) ; Gómez, J.B. (Universidad de Zaragoza. Departamento de Ciencias de la Tierra) ; Asta Andrés, María Pilar (Consejo Superior de Investigaciones Científicas (Espanya). Institut de Ciències de la Terra Jaume Almera) ; Yechieli, Y. (Ben Gurion University of the Negev (Israel). Zuckerberg Institute for Water Research, Blaustein) ; Universidad de Granada ; Geological Survey of Israel ; Ben Gurion University of the Negev (Israel). Department of Environmental Hydrology & Microbiology ; Ben Gurion University of the Negev (Israel). Institutes for Desert Studies
The main processes controlling the hydrochemistry of an alluvium-covered evaporite karst area with high sinkhole risk (Ebro Valley, NE Spain) are examined by means of multivariate analyses (Principal Component Analysis and Hierarchical Cluster Analysis), ion correlations and geochemical speciation-solubility calculations. [...]
2013 - 10.1344/105.000002052
Geologica acta, Vol. 11, Núm. 4 (December 2013) , p. 389-407  
3.
14 p, 2.4 MB Facies and geochemistry of non-marine gypsum, EMISAL, Egypt / Ali-Bik, M. W. (National Research Centre. Geological Sciences Department(Egipte)) ; Metwally, H. I. M. (National Research Centre. Geological Sciences Department (Egipte)) ; Wali, A.M.A. (Cairo University (Egipte). Geology Department) ; Kamel, M.G. (Academy of Scientific Research and Technology (Egipte))
Diverse gypsum facies in terms of crystal size and morphology are deposited in a shallow, non-marine, sulfate-enriched, semi-closed, perennial evaporite basin. These gypsum facies were deposited in intimate association with cyanobacterial mats. [...]
2013 - 10.1344/105.000002051
Geologica acta, Vol. 11, Núm. 4 (December 2013) , p. 409-420  
4.
21 p, 2.5 MB The record of the Paleocene-Eocene thermal maximum in the Ager Basin (Central Pyrenees, Spain) / Minelli, N. (Università degli Studi di Parma. Dipartimento di Fisica e Scienze della Terra Macedonio Melloni) ; Manzi, V. (Alpine Laboratory of Palaeomagnetism (ALP)) ; Roveri, M. (Alpine Laboratory of Palaeomagnetism (ALP))
The sedimentary record straddling the Paleocene/Eocene boundary in the Ager Basin (southern Central Pyrenees) was investigated by combining facies analysis, sequence stratigraphy and stable isotope data, within an interval characterized by a great variability of depositional environments. [...]
2013 - 10.1344/105.000002061
Geologica acta, Vol. 11, Núm. 4 (December 2013) , p. 421-441  
5.
23 p, 4.3 MB Geochemical and geochronological constraints on the geologic evolution of the western Sonobari Complex, northwestern Mexico / Vega-Granillo, R. (Universidad de Sonora. Departamento de Geología) ; Vidal-Solano, J.R. (Universidad de Sonora. Departamento de Geología) ; Solari, L. (Universidad Nacional Autónoma de México. Centro de Geociencias) ; López-Martínez, M. (Centro de Investigación Científica y de Educación Superior de Ensenada (Mèxic). Departamento de Geología) ; Gómez-Juárez, O.S. (Universidad Autónoma de Guerrero. Unidad Académica de Ciencias de la Tierra) ; Herrera-Urbina, S. (Universidad de Sonora. Departamento de Geología)
In the southern Sierra Sonobari, NW Mexico, U-Pb and 40Ar/39Ar geochronology studies allowed to define the provenance and maximum depositional age of the Francisco Gneiss basement of the Sonobari terrane, and to establish the age of some magmatic events in that area. [...]
2013 - 10.1344/105.000002059
Geologica acta, Vol. 11, Núm. 4 (December 2013) , p. 443-463  
6.
17 p, 2.2 MB Analysis of the iron coatings formed during marcasite and arsenopyrite oxidation at neutral-alkaline conditions / Asta Andrés, María Pilar (Consejo Superior de Investigaciones Científicas (Espanya). Institut de Ciències de la Terra Jaume Almera) ; Pérez-López, Rafael (Universidad de Huelva. Departamento de Geología) ; Román-Ross, G. (Amphos 21) ; Illera, V. (University of California. School of Natural Sciences) ; Cama, J. (Consejo Superior de Investigaciones Científicas (Espanya). Institute of Environmental Assessment and Water Research) ; Cotte, M. (European Synchrotron Facility) ; Tucoulou, R. (European Synchrotron Facility)
In order to study the nature of the precipitates formed on arsenopyrite and marcasite after reacting with neutral to alkaline solutions, a combination of techniques including Scanning Electron Microscope-Energy Dispersive Spectroscopy (SEM-EDS), X-ray Photoelectron Spectroscopy (XPS) and synchrotron-based techniques such as micro-X-Ray diffraction (µXRD) and Micro-X-ray Absorption Near Edge Structure (µXANES) have been used. [...]
2013 - 10.1344/105.000002062
Geologica acta, Vol. 11, Núm. 4 (December 2013) , p. 465-481  
7.
11 p, 578.9 KB Variations in chemistry of macerals as refl ected by micro-scale analysis of a Spanish coal / Mastalerz, M. (Indiana University. Indiana Geological Survey) ; Hower, J.C. (University of Kentucky. Center for Applied Energy Research) ; Taulbee, D.N. University of Kentucky. Center for Applied Energy Research
An Oligocene lignite (Ebro Basin, Spain) and its density fractions were analyzed petrographically and with microscale techniques (electron microprobe and micro-FTIR) to gain insight into differences between individual macerals of low rank high-sulfur coal. [...]
2013 - 10.1344/105.000002054
Geologica acta, Vol. 11, Núm. 4 (December 2013) , p. 483-493  

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