Browsing Fakultät für Geowissenschaften und Geographie (inkl. GAUSS) by Referee "Thiel, Volker Prof. Dr."
Now showing items 1-20 of 32
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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 ... -
An integrated approach to the study of biosignatures in mineralizing biofilms and microbial mats
(2011-02-02)In this thesis project, biomarkers, biomineralization processes and TREE (trace and rare earth elements) patterns in mineralizing microbial mats were established and tested as biosignatures ... -
Assessing the formation and preservation of organic signatures in extreme environments in the context of the ExoMars 2020 rover mission
(2019-09-20)The search for extraterrestrial life is one of the greatest scientific quests of our time. The ESA/Roscosmos ExoMars 2020 rover mission seeks to find evidence for past or modern life on Mars by investigating (sub-)surface ... -
Assessments of phenotypic variations and variability as a tool for understanding evolutionary processes in echinoids
(2016-07-20)The following three chapters can be regarded as thematic complexes of studies on phenotypic variations and variability in order to elucidate their origins on a systematic hierarchy-level in echinoids. Chapter 2 seeks ... -
Biosignatures of modern microbial mats, Kiritimati/Kiribati, Central Pacific
(2019-10-17)Organic biomarkers have been widely used to trace the information of their biological precursors and to reveal information about fossil depositional environment, and thus they help to reconstruct ancient ecosystems. Prior ... -
Charakterisierung minimaler und maximaler Hemmkonzentrationen verschiedener Spurenelemente in Biogasprozessen und Entwicklung eines vereinfachten Bestimmungsverfahrens
(2020-08-24)For optimal biogas formation processes in biogas plants numerous operating parameters must be within certain limits. A sufficient supply of essential macro- and micronutrients must be guaranteed for the conversion and ... -
Contributions to the Palaeobiology of the Archosaurs (Reptilia: Diapsida) from the Bückeberg Formation ('Northwest German Wealden' - Berriasian-Valanginian, Lower Cretaceous) of northern Germany
(2013-11-27)Fossil remains of archosaurs, the dominant clade of non-marine tetrapods during the Mesozoic, are known from the Berriasian to Lower Valanginian Bückeberg Formation (the “German Wealden”) of northwestern Germany since the ... -
Diversity and ecology of ectosymbioses between sulfur-oxidizing Thiothrix bacteria and groundwater niphargid amphipods
(2013-02-21)This thesis project dealt with the exploration of ectosymbiotic relationships between filamentous, sulfur-oxidizing Thiothrix bacteria and groundwater-inhabiting niphargid amphipods. In 2009, "the first known example of a ... -
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, ... -
Fluid venting structures of terrestrial mud volcanoes (Italy) and marine cold seeps (Black Sea) -Organo-geochemical and biological approaches
(2012-03-06)Two different fluid venting structures, marine cold seeps of the Black Sea and terrestrial mud volcanoes of Italy, were part of this thesis. Both were formed by the expulsion of water, mud ... -
Formation and preservation of abiotic organic signatures vs. lipid biomarkers—experimental studies in preparation for the ExoMars 2020 mission
(2018-06-22)Molecular organic biomarkers have widely been used to track life through Earth’s history, and they became increasingly important in the search of potential (remnants of) life on Mars. The Mars Organic Molecule Analyzer ... -
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 ... -
Geobiology of the stratified central Baltic Sea water column
(2014-09-30)The central Baltic Sea water column is permanently density stratified leading to stagnating bottom waters and a zonation into an oxic, suboxic and anoxic zone. The anoxic zone of the central Baltic Sea is characterized by ... -
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 ... -
Geothermometry by Raman spectroscopy of dispersed organic matter
(2016-10-17)Raman spectroscopy of carbonaceous material (RSCM) is frequently used to determine peak metamorphic temperature or to infer the coal rank as well as the degree of organic maturation. Several temperature calibrations ... -
Highly resolved thermal analysis as a tool for simultaneous quantification of total carbon, organic carbon, inorganic carbon and soil organic carbon fractions in landscapes
(2015-02-25)To quantify and evermore qualify carbon in soils have become highly timely task in landscape ecology. However, separating soil organic carbon (SOC) into different ecologically relevant fractions is difficult. Particularly ... -
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 ... -
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 ... -
“Keratose” sponge fossils and microbialites: a geobiological contribution to the understanding of metazoan origin
(2015-02-18)Molecular clock and the fossil record at the Precambrian-Cambrian boundary indicate that animals probably had a long evolutionary history in the Precambrian which is still poorly explored and understood. This PhD study was ...