Browsing Fakultät für Geowissenschaften und Geographie (inkl. GAUSS) by Referee "Wörner, Gerhard Prof. Dr."
Now showing items 1-20 of 25
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Application of Garnet in Sedimentary Provenance Analysis
(2015-11-13)This PhD thesis investigates the application of heavy minerals in sedimentary provenance analysis, with the main focus on garnet geochemistry. The work is mainly based on an intensive literature study, fieldwork, conventional ... -
Composition and compositional zoning of olivine as a tracer for pre-eruptive magmatic processes: Application to Piton de la Fournaise, Laacher See, and Shiveluch volcano
(2020-08-12)This dissertation deals with the reconstruction of pre-eruptive magmatic processes with respect to their timescales. Deep recharges of mafic magma into shallower reservoirs and subsequent magma mixing are assumed to play ... -
Constraints on pre-eruptive magmatic history using multi-faceted diffusion modeling: an analytical, experimental and numerical study
(2020-05-28)Time-scales extracted from chemically zoned minerals provide insights into crystal residence time, magma storage and compositional evolution of magmas and allow better constraints on pre-eruptive history of large and ... -
Differentiation regimes in the Central Andean magma systems: case studies of Taapaca and Parinacota volcanoes, Northern Chile
(2014-10-29)Volcanoes have shaped the Earth’s surface and are nature’s most awesome manifestation of the power within our planet (Rosaly M. Lopes). Compositional and mineralogical diversity of erupted lavas reflects distinct magma ... -
Early Earth mantle heterogeneities
(2023-07-04)Determining isotopic signatures established in the Hadean mantle offers far-reaching insights into the origin of Earth’s accreted building blocks, core formation, mantle differentiation as well as the formation of Earth’s ... -
Entgasung und Kristallisation beim Aufstieg dazitischer Magmen zur Erdoberfläche
(2014-10-29)In this study, kinetic processes during experimentally simulated ascent of dacitic magmas, based on eruption products of Taapaca volcano, were investigated. The focus was on degassing of water saturated samples and the ... -
Fluid Histories During HP and UHP Metamorphism in Dabie Shan, China: Constraints from Trace Elements, Fluid Inclusions, and Stable Isotopes
(2001-03-06)The Dabie-Sulu ultrahigh-pressure (UHP) metamorphic belt in East China is known to be the largest among recognized UHP terrains in the world. It represents deep parts of a collision zone ... -
Fluorite (U-Th-Sm)/He thermochronology
(2016-07-01)The aim of my thesis is to establish an emerging and novel method in low-temperature thermochronology based upon the mineral fluorite. The new and until now rarely applied method, fluorite (U-Th-Sm)/He thermochronology ... -
Generating early continental crust
(2020-07-09)Archean cratons are the products of geodynamic processes governing the evolution of the early Earth. They comprise felsic granitoids enclosed by folded volcano-sedimentary successions. However, these rocks may not be ... -
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 ... -
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 ... -
Laser Ablation-Inductively Coupled Plasma-Mass Spectrometer (LA-ICP-MS) in Geosciences: Further Improvement for Elemental Analysis
(2017-09-08)A quantitative reduction strategy consisting of Ratioing, Standardization, and Normalization (RSN) was proposed to process the LA-ICP-MS transient signal of NIST, MPI-DING, USGS and CGSG glass reference materials. The RSN ... -
Late Mesozoic to Cenozoic erosion and sediment dispersal in the Dinaride orogen: a sedimentary provenance approach
(2009-04-03)This work presents the results of a sedimentary provenance study undertaken in Cretaceous to Tertiary basins of the Dinarides. The major objective has been to put new constraints on the ... -
Lower Ocean Crust beneath Slow-Spreading Ridges: a Combined Oxygen Isotopic and Elemental in-situ Study on Hole 735B Gabbros
(2004-07-06)Chemical and oxygen isotopic composition of the constituent minerals in oceanic gabbros from ODP Hole 735B have been investigated by a combined in-situ analytical study with UV-laser-ablation ... -
Mechanisms of magma emplacement in the upper crust
(2009-05-15)The mechanisms that control magma emplacement in the upper crust are characterised by brittle failure of the host rock and subject to the influence of magma. This thesis is a compilation ... -
Metamorphic fluids at extreme pressure conditions and their significance for element transfer in subduction zones
(2017-05-15)The present study provides a comprehensive geochemical dataset on ultra-/high pressure (UHP/HP) eclogites and enclosed, fluid-deposited metamorphic veins. It targets to broaden our understanding of the nature and extent ... -
Oxygen isotope microanalysis of silicates with application to fluid-rock interfaces
(2001-10-31)In order to investigate crustal fluid-rock interactions an oxygen isotope microprobe was set up. Oygen is extracted from silicates by Ultra-Violet (UV)-laser fluorination and its isotropic ... -
Physical and thermodynamic properties of aluminosilicate melts as a function of composition
(2008-04-25)Viscosity, heat capacity, density, compressibility, thermal conductivity, thermal expansion, diffusivity, surface tension of melts are all controlled by the melt structure. The structure of the melt is a function ... -
Provenance model of the Cenozoic siliciclastic sediments from the western Central Andes (16-21°S): implications for Eocene to Miocene evolution of the Andes
(2011-11-09)The tectonic evolution of the South American continent western margin is controlled by the continuous subduction of the Nazca plate. The Central Andes, which reach altitudes of 6500 m, are ... -
Source and magmatic evolution of the Neapolitan volcanoes through time (Southern Italy)
(2019-05-10)This study provides a multidisciplinary approach, based on separated single minerals from Neapolitan volcanic products aimed to extend the present knowledge on the evolution of the Neapolitan magma source(s). Of particular ...