Geologie: Recent submissions
Anzeige der Dokumente 551-575 von 933
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Geodynamic evolution of the Eastern Sierras Pampeanas (Central Argentina) based on geochemical, Sm–Nd, Pb–Pb and SHRIMP data
Drobe, Malte; Luchi, Mónica; Steenken, André;
; Naumann, Rudolf; Frei, Robert; Siegesmund, Siegfried (International Journal of Earth Sciences, 2010)
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On the operating mode of bimetallic systems for environmental remediation
(Journal of Hazardous materials, 2008)
This letter challenges the concept that Fe0/Me0 bimetallic systems enhance contaminant reduction on Me0 surfaces. It is shown on a pure thermodynamic perspective that any enhancement of contaminant reduction by Fe0 in the ... -
The tectonic significance of K/Ar illite fine-fraction ages from the San Luis Formation (Eastern Sierras Pampeanas, Argentina)
; Steenken, André; Müller, Stefan; Luchi, Mónica; Siegesmund, Siegfried (International Journal of Earth Sciences, 2011)
The Sierra de San Luis forms the southern tip of the Eastern Sierras Pampeanas in central Argentina. Two narrow belts of low-grade phyllites and quartz arenites, i.e. the San Luis Formation, have accommodated part of the ... -
Provenance of the Bosnian Flysch
Mikes, Tamás; Christ, Dominik; Petri, Rüdiger;; Frei, Dirk; Báldi-Beke, Mária; ; ; Hrvatović, Hazim; Eynatten, Hilmar (Swiss Journal of Geosciences, 2008)
Sandwiched between the Adriatic Carbonate Platform and the Dinaride Ophiolite Zone, the Bosnian Flysch forms a c. 3000 m thick, intensely folded stack of Upper Jurassic to Cretaceous mixed carbonate and siliciclastic ... -
The suitability of metallic iron for environmental remediation
(Environmental Progress & Sustainable Energy, 2009)
Aqueous contaminant removal in the presence of metallic iron is often regarded as a reductive transformation mediated by the Fe0 surface. However, successful removal of theoretically non-reducible contaminants has been ... -
The Río de la Plata Craton: a review of units, boundaries, ages and isotopic signature
Oyhantçabal, Pedro; Siegesmund, Siegfried; (International Journal of Earth Sciences, 2010)
A review of the lithostratigraphic units in the Río de la Plata Craton and of new and previously published geochronological, isotopic and geophysical data is presented. Sm–Nd TDM model ages between 2.6 and 2.2 Ga characterize ... -
Cambrian sedimentary dykes in the Proterozoic basement of the Västervik area (southeast Sweden): episodic formation inferred from macro- and microfabrics
Friese, Nadine; Vollbrecht, Axel;; Jacke, Olaf (International Journal of Earth Sciences, 2010)
Fabrics of Cambrian sedimentary dykes formed in Proterozoic granites of the Västervik area (Southeast Sweden) evidence repeated opening/filling and mineralisation/cementation events under varying conditions. Diagnostic ... -
The transpressional connection between Dom Feliciano and Kaoko Belts at 580–550 Ma
Oyhantçabal, Pedro; Siegesmund, Siegfried;; (International Journal of Earth Sciences, 2010)
A new U–Pb SHRIMP age of 551 ± 4 Ma on a mylonitic porphyry that intruded into the Sierra Ballena Shear Zone (Southernmost Dom Feliciano Belt, Uruguay) and a review of relevant published data make possible a more refined ... -
A Numerical Model of Tracer Transport in a Non-isothermal Two-Phase Flow System for CO2 Geological Storage Characterization
(Transport in Porous Media, 2013) -
Bestimmung der Schadstofffrachten an Kontrollebenen mithilfe von Punktkonzentrationsmessungen und Immissionspumpversuchen – ein Vergleich
(Grundwasser, 2008)Kurzfassung Die Quantifizierung der Schadstofffrachten an Kontrollebenen ist eine entscheidende Voraussetzung zur Bewertung von Grundwasserschadensfällen und zum Nachweis von Natural Attenuation. Hierzu können zwei ... -
Discrimination of TiO2 polymorphs in sedimentary and metamorphic rocks
(Contributions to Mineralogy and Petrology, 2010)Investigation by Raman spectroscopy of samples from different geological settings shows that the occurrence of TiO2 polymorphs other than rutile can hardly be predicted, and furthermore, the occurrence of anatase is more ... -
Protomylonite evolution potentially revealed by the 3D depiction and fractal analysis of chemical data from a feldspar
(Contributions to Mineralogy and Petrology, 2014)An alkali feldspar megacryst from a protomylonite has been studied using laser ablation-ICP-mass spectrometry combined with cathodoluminescence imaging, Raman spectroscopy, and electron probe microanalysis. The aim was to ... -
Variation in rates of early development in Haliotis asinina generate competent larvae of different ages
(Frontiers in Zoology, 2012)Introduction Inter-specific comparisons of metazoan developmental mechanisms have provided a wealth of data concerning the evolution of body form and the generation of morphological novelty. Conversely, studies of ... -
Competition between grain growth and grain-size reduction in polar ice
(Journal of Glaciology, 2011)Static (or ‘normal’) grain growth, i.e. grain boundary migration driven solely by grain boundary energy, is considered to be an important process in polar ice. Many ice-core studies report a continual increase in average ... -
Weathering of volcanic tuff rocks caused by moisture expansion
Wedekind, Wanja; López-Doncel, Rubén;; Kocher, Mathias; Siegesmund, Siegfried (Environmental Earth Sciences, 2012)
Moisture expansion in natural building stones is considered one of the most important factors affecting their weathering and deterioration. The processes that may be responsible for the expansion under determinate relative ... -
Stability assessment of marble statuaries of the Schlossbrücke (Berlin, Germany) based on rock strength measurements and ultrasonic wave velocities
(Environmental Earth Sciences, 2013)The degree of weathering in natural stones on buildings and sculptures has been determined for many years in numerous cases by means of ultrasonic measurements. Conclusions concerning the strength of the rock and the type ... -
Metallic iron for water treatment: A knowledge system challenges mainstream science
(Fresenius Environmental Bulletin, 2011)
A knowledge system (KS) is a knowledge that is unique to a given group of persons. This form of knowledge may have a local or natural origin and is linked to the community that has produced it. On the contrary, the core ... -
Moisture expansion associated to secondary porosity: an example of the Loseros Tuff of Guanajuato, Mexico
López-Doncel, Rubén; Wedekind, Wanja;; Siegesmund, Siegfried (Environmental Earth Sciences, 2012)
The old mining city of Guanajuato in middle Mexico preserves one of the most important historical legacies in colonial buildings, the UNESCO declared the city World Heritage Site in 1988. Practically all the colonial ... -
Microcracking in calcite and dolomite marble: microstructural influences and effects on properties
(Environmental Earth Sciences, 2012)Microstructure‐based finite-element analysis with a microcracking algorithm was used to simulate an actual degradation phenomenon of marble structures, i.e., microcracking. Both microcrack initiation and crack propagation ... -
Granitic dimensional stones in Uruguay: evaluation and assessment of potential resources
(Environmental Earth Sciences, 2012)In Uruguay commercial granite varieties comprise mafic rocks, granitoids, and syenitoids. There is a long tradition in Uruguay, as well as worldwide, of using dimensional stones in architecture and art, specially granitic ... -
The effect of air pollution on stone decay: the decay of the Drachenfels trachyte in industrial, urban, and rural environments—a case study of the Cologne, Altenberg and Xanten cathedrals
(Environmental Earth Sciences, 2013)Severe stone deterioration is evident at the Cologne cathedral. In particular, the “Drachenfels” trachyte, which was the building material of the medieval construction period, shows significant structural deterioration as ... -
Provenance of Pleistocene Rhine River Middle Terrace sands between the Swiss–German border and Cologne based on U–Pb detrital zircon ages
(International Journal of Earth Sciences, 2012) -
Dolomitic slates from Uruguay: petrophysical and petromechanical characterization and deposit evaluation
(Environmental Earth Sciences, 2012)Slates are internationally known as roof and façade-cladding material since prehistoric times. The methods required to mine and manufacture these dimensional stones are relatively simple in comparison to those utilized in ... -
CO2 emissions in German, Swedish and Colombian manufacturing industries
(Regional Environmental Change, 2013)This study evaluates and compares the trends in CO2 emissions for the manufacturing industries of three countries: two developed countries (Germany and Sweden) that have applied several measures to promote a shift towards ... -
Localisation and temporal variability of groundwater discharge into the Dead Sea using thermal satellite data
Mallast, U.; Siebert, C.;; ; Gloaguen, R.; Geyer, S.; (Environmental Earth Sciences, 2013)
