Browsing Naturwissenschaften, Mathematik und Informatik by Referee "Hansen, Bent T. Prof. Dr."
Now showing items 1-17 of 17
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Isotopengeochemische Untersuchungen an postglazialen Karbonaten des Neoproterozoikums aus China und Namibia
(2017-12-22)The Neoproterozoic time, especially the Cryogenian is characterised by extreme climate conditions. Two of the known global glaciations – the Sturt and Marinoan – occurred during this period. In the following Ediacaran ... -
Isotope- and REE-Characterization of Groundwater Aquifers
(2016-06-15)This PhD thesis investigates the application of isotope techniques in groundwater aquifers, with the main focus on systematic variations of the Strontium (Sr) isotopes and chemical composition including fractionation ... -
Geodynamic significance of the Cenozoic deposits in the southern Peruvian forearc (16°25’S to 17°15’S): constraints by facies analysis and sediment provenance.
(2015-11-30)Cenozoic sediments in southern Peru are responses of a complex interaction of active geodynamics and sedimentation, which is conspicuous of the Central Andes tectonics. By combining multimethodic analysis on single grain ... -
Volatilitätskontrollierte Fraktionierung refraktär-lithophiler Elemente in Meteoriten und der Erde
(2014-08-14)During the condensation of the elements in the early solar system, volatility-controlled fractionations occurred. Such fractionations of refractory lithophile elements in individual chondrite components and between bulk ... -
Paläoproterozoisches Krustenwachstum (2.0-1.8 Ga) am Beispiel der Västervik-Region in SE-Schweden und dem Kamanjab Inlier in NW-Namibia
(2013-02-04)Whole rock geochemical analyses using major and trace elements in combination with the Sm-Nd, Rb-Sr, K-Ar and U-Pb isotope systems as well as studies of P-T conditions on metamorphic rocks from the Västervik-area (SE-Sweden), ... -
Bromide characteristics and deformation mechanisms of naturally deformed rock salt of the German Zechstein Basin
(2011-12-12)This dissertation includes four studies that were concerned with geochemical characteristics and deformation mechanisms of rock salt. The studies focused especially on the rock salt of the ... -
History and geochemical evolution of igneous rocks forming the Panama land bridge since Late Cretaceous
(2011-10-24)Major and trace elements, Sr-, Nd-, Pb-, and O-isotopes and 40Ar/39Ar dating of igneous rocks from the Cordillera de Panama and the Soná and Azuero Peninsulas define the magmatic evolution ... -
Cenozoic tectonic deformation, thermochronology and exhumation of the Diancang Shan metamorphic massif along Ailao Shan-Red River shear zone, southeastern Tibet, China
(2011-06-16)Chapter 1 this thesis outlines the Cenozoic tectonic evolution of a critically important area within the India-Eurasian collision zone, i.e. the Diancang Shan (DCS) metamorphic massif along ... -
Evaluation of 87Sr/86Sr, δ18O, δ2H, and Cation Contents as Geochemical Tracers for Provenance and Flow Paths of Saline Solutions in German Zechstein Deposits
(2009-05-15)The assessment of flow paths of saline solutions that percolate through evaporitic deposits is an important task for a mining company to avoid loss of a mine by flooding. In this study, the ... -
Darstellung magmatischer Prozesse über die U-Th Ungleichgewichts-Methode. Vergleich von zwei andinen magmatichen Systemen: Vulkan El Misti (Südperu) versus des Taapaca Vulkankomplexes (Nordchile).
(2009-03-10)El Misti Volcano (South Peru) and Taapaca Volcanic Complex (North Chile) both located in the Central Andean Volcanic Zone in South America have been studied in order to place constrains on ... -
Variations in magma composition in time and space along the Central Andes (13°S-28°S)
(2006-11-01)Meso-Cenozoic magmatic arc systems of the Central Andes (CA) result from the subduction of the Nazca Plate beneath the South America plate since Jurassic time, the arc progressively shifted ... -
The Sierra Ballena Shear zone:
(2005-06-06)The Sierra Ballena Shear Zone is a high-strain transcurrent structure that divides the Neoproterozoic Dom Feliciano Belt of South America into two different domains. The eastern and western ... -
Geochemical variations in magmatic rocks from southern Costa Rica as a consequence of Cocos Ridge subduction and uplift of the Cordillera de Talamanca
(2001-11-01)The Cordillera de Talamanca, which constitutes the magmatic arc in SE Costa Rica, its related forearc (Fila Costeña) and backarc region (Limon Basin) are a segment of the Central American ... -
Hydrothermale Alterationsprozesse in Zirkonen
(2001-11-01)The U/Pb isotopic system of zircons is a powerful tool to date rocks. Nevertheless interpretation of discordant U/Pb ages is again and again subject of discussions. We focussed our study ... -
K-Ar-Datierungen an detritischen Muskoviten und Sm-Nd-Modellalter prä- und synorogener schwach metamorpher Sedimente im Rhenoherzynikum - Grundlegende Daten zur Quantifizierung orogener Prozesse am Beispiel der Varisziden
(2001-07-06)The combination of K-Ar cooling ages of detrital muscovites, Sm-Nd model ages and geochemical investigations allows the discrimination of four crustal segments as provenance areas for the ...