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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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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
Unmixing of Phosphorus-bearing Melts on Earth and Mars
(2019-04-17)The aim of this study lies in the investigation on unmixing in aluminosilicate melts. Therefore, six glasses of peralkaline and peraluminous compositions were synthesized in the system CaO-Al2O3-SiO2, Na2O-Al2O3-SiO2 and ... -
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 ... -
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 ... -
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 ... -
The causes and effect of temporal changes in magma generation processes in space and time along the Central Andes (13°S – 25°S)
(2015-11-27)This thesis investigates the timing and causes of the transition between two different magmatic regimes during the evolution of the Central Andean uplift. The first volcanic regime is represented by Miocene lava shields, ... -
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 ... -
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 ... -
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 ... -
The Influence of Fluorine, Chlorine and Water on the Rheology and Structure of Na2O-CaO-Al2O3-SiO2 Melts
(2014-05-21)This study investigates the influence of 1.6 to 14.5 mol% water, 1.1 to 18.3 mol% fluorine (F) and 0.5 to 1.4 mol% chlorine (Cl), alone and combined, on the structure and viscosity of peralkaline and peraluminous Na2O CaO ... -
The microscopic dimension of paleoclimate in the EPICA-DML(Antarctica) deep ice core
(2013-03-12)The present work is divided into two main parts: the introductory half and the experimental chapter. Chapter 1 starts with the brief presentation of the scientific project that facilitated the development of the thesis, ... -
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 ... -
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 ... -
The geochemistry of detrital rutile - Implications for sedimentary provenance studies and the reconstruction of metamorphic conditions
(2011-08-15)Samples investigated in this study derive from a large range of metamorphic conditions (from diagenetic up to 950°C and 4.5GPa) and geological settings. Main sampling localities were the ... -
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 ... -
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 ...