Browsing Fakultät für Geowissenschaften und Geographie (inkl. GAUSS) by Referee "Pack, Andreas Prof. Dr."
Now showing items 1-20 of 26
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A geobiological approach to carbonate factories and ecosystem changes across the Permian–Triassic boundary
(2022-04-05)Contemporary climate change is accelerating. Meanwhile, “Has the Earth’s sixth mass extinction already arrived?” is inquired. The Permian–Triassic crisis, as a possible analog in the Earth history, has aroused great ... -
Carbon Dioxide un ultrapotassic silicate melts: Experimental insights on solubility and decompression induced vesicle nucleation
(2021-10-01)Until today, the explosivity of volcanic eruptions cannot be forecasted by even the most modern monitoring techniques. The processes causing these events, endangering the lives of millions of people, happen deep inside the ... -
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 ... -
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 ... -
Ejecta erosion, hydrological, and chemical lake evolution in the Ries impact basin (Miocene, Germany)
(2022-04-08)To inspect past environmental changes and potential habitability, the growing interests for the ancient Martian crater lakes call for better understandings of palaeolimnological evolution of impact crater lakes. Particularly, ... -
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 ... -
Geobiology of bituminous carbonates from the Ediacaran Shibantan Member (Dengying Formation, South China)
(2014-10-08)The Shibantan Member is one of only two known carbonate settings characterised by a 'typical' Ediacaran fossil association including Ediacara-type fossils. Aim of this project was a comprehensive geobiological characterisation ... -
Hydrochemical and environmental isotope study of the geothermal water in Mae Chan (North) and Ranong (South) geothermal areas in Thailand
(2021-05-28)The exploration and development of geothermal resources in Thailand have been investigated for electricity generation since 1946. In total, 112 hot springs are manifested which mostly scattered at the granite body from the ... -
Impact of climate change on recharge and vadose-phreatic storage dynamics of a Mediterranean karst aquifer: Quantitative approach for the management of a complex groundwater resource
(2023-04-11)The Mediterranean basin will be severely affected by global warming and decreased average rainfall and is often portrayed as the most prominent climate change hotspot. At the same time, the Mediterranean basin is endowed ... -
Investigating the dielectric profiling of ice cores
(2021-02-12)The polar regions are important components of the Earth's climate system, as these areas are the main sources of fresh water on Earth. Any conflicts in that system can affect people's lives in different ways. Numerous ... -
Layerings in the nucleus of comet 67P/Churyumov-Gerasimenko
(2019-11-19)The Rosetta mission to delivered images of comet 67P’s nucleus at unprecedented resolution which indicate the presence of a global layering system. By merging techniques of structural geology, statistical image processing, ... -
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 ... -
Microbial alteration of geochemical proxies in finegrained carbonate sediments during early diagenesis
(2021-07-27)Fine-grained carbonate sediments play a crucial role in the global carbon cycle and are an exceptional record of past environmental conditions. Major paleoenvironmental constraints, derived from stable isotope and trace ... -
Sauerstoffisotope zur Klärung der Herkunft nichtmetallischer Ausscheidungen (Clogging) beim Stranggießen von Stahl
(2008-03-03)Nonmetallic precipitates in steelmaking process are a process and a product problem. In Al-killed steel these precipitates are predominantly composed of alumina inclusions. These particles are deposited e.g. at the inner ... -
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 ... -
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, ... -
The Distribution of Water in the Lunar Magmatic Ocean
(2023-07-17)Water plays an important role for many geological and organic processes. Nevertheless, it is still unclear why our Earth has such large quantities of it. Either it has been part of the building blocks of our planet or was ... -
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 ...