A5079585417- Hydrocarbon exploration and reservoir analysis
- Methane Hydrates and Related Phenomena
- Paleontology and Stratigraphy of Fossils
- Geology and Paleoclimatology Research
- Pleistocene-Era Hominins and Archaeology
- Geological and Geochemical Analysis
- Planetary Science and Exploration
- Petroleum Processing and Analysis
- Astro and Planetary Science
- Oil Palm Production and Sustainability
- CO2 Sequestration and Geologic Interactions
- Spaceflight effects on biology
- Geochemistry and Geologic Mapping
- Geological Studies and Exploration
- Isotope Analysis in Ecology
- Agricultural pest management studies
- Evolution and Paleontology Studies
- Geological and Geophysical Studies
- Atmospheric and Environmental Gas Dynamics
- Biofuel production and bioconversion
- Radiomics and Machine Learning in Medical Imaging
- Cerebrospinal fluid and hydrocephalus
- Metabolomics and Mass Spectrometry Studies
- Rangeland Management and Livestock Ecology
- Geological formations and processes
University of Göttingen
2017-2024
Universidade Federal do Rio de Janeiro
2024
Linnaeus University
2020-2024
University of Basel
2023
Max Planck Institute for Solar System Research
2017-2020
Max Planck Society
2017-2019
Planet
2019
Abstract. Archaean hydrothermal chert veins commonly contain abundant organic carbon of uncertain origin (abiotic vs. biotic). In this study, we analysed kerogen contained in a vein from the ca. 3.5 Ga Dresser Formation (Pilbara Craton, Western Australia). Catalytic hydropyrolysis (HyPy) yielded n-alkanes up to n-C22, with sharp decrease abundance beyond n-C18. This distribution (≤ n-C18) is very similar that observed HyPy products recent bacterial biomass, which was used as reference...
Microbial life on Earth was well established in the Paleoarchean, but insight into early ecosystem diversity and thus, complexity of biological carbon cycle is limited. Here we investigated four carbonaceous chert samples from lower platform facies ca. 3.42-billion-year-old Buck Reef Chert, Barberton greenstone belt. The analysis multiple scales revealed exceptionally well-preserved matter, even molecular level (aliphatic aromatic hydrocarbons), resulting rapid silicification. Geochemical...
Organic petrology developed from coal petrology, and, in the 1960s, it began to be applied study of dispersed organic matter (DOM) sedimentary rocks other than coal. Over last few decades, DOM has been used characterize basins with an emphasis on fossil fuel resource exploration. Today, due global research shift topics related climate, expanded into new application areas, such as geothermal exploration, biological carbon storage (biochar), disposal, and management radioactive waste. From...
Abstract Deeply fractured rocks of meteorite impact craters are suggested as prime niches for subsurface microbial colonization. Methane can be a product such communities and seeps methane from on Earth strong interest they act analogs Mars. Previous studies report signs ancient methanogenesis in the Devonian Siljan structure Sweden, but proportion methane, metabolic pathways, potential modern activity remain elusive. In this study, gas composition, hydrochemistry, oil organic geochemistry,...
Abstract. Organic matter in Archean hydrothermal cherts may provide an important archive for molecular traces of the earliest life on Earth. The geobiological interpretation this archive, however, requires a sound understanding organic preservation and alteration systems. Here we report (including biosignatures) enclosed hydrothermally influenced Pleistocene Lake Magadi (Kenya; High Beds Green Beds). contain low carbon (< 0.4 wt %) that occurs form finely dispersed clots, layers, or...
Carbonaceous matter (CM) in Archean rocks represents a valuable archive for the reconstruction of early life. Here we investigate nature CM preserved ∼ 3.5 Ga old black bedded barites from Dresser Formation (Pilbara Carton, Western Australia). Using light microscopy and high-resolution Raman mapping, three populations were recognized: (i) at edges single growth bands barite crystals (most frequent), (ii) within matrix, (iii) 50–300 µm wide secondary quartz veins that cross-cut barite....
Abstract Earth’s crust contains a substantial proportion of global biomass, hosting microbial life up to several kilometers depth. Yet, knowledge the evolution and extent in this environment remains elusive patchy. Here we present isotopic, molecular morphological signatures for deep ancient vein mineral specimens from mines distributed across Precambrian Fennoscandian shield. Stable carbon isotopic calcite indicate methanogenesis. In addition, sulfur isotope variability pyrite, supported by...
Abstract Recent studies have shown that biosignatures of ancient microbial life exist in mineral coatings deep bedrock fractures Precambrian cratons, but such surveys been few and far between. Here, we report results from southwestern Sweden an area 1.6–1.5 Ga Paleoproterozoic rocks heavily reworked by the 1.14–0.96 Sveconorwegian orogeny, a terrane previously scarcely explored for biosignatures. Calcite‐pyrite‐adularia‐illite‐coated were analyzed stable isotopes via Secondary Ion Mass...
The Mars Organic Molecule Analyzer (MOMA) onboard the ExoMars 2020 rover (to be landed in March 2021) utilizes pyrolysis gas chromatography-mass spectrometry (GC-MS) with aim to detect organic molecules martian (sub-) surface materials. Pyrolysis, however, may thermally destroy and transform matter depending on temperature nature of molecules, thus altering original molecular signatures. In this study, we tested MOMA flight-like GC-MS without addition perchlorates well-characterized natural...
Abstract The Renewable Energy Directive (RED II) by the European Union (EU) provides an updated framework for use of renewable energy in EU transport sector until 2030, and bans biofuels with a high risk causing indirect land‐use change carbon stock areas (high ILUC‐risk criteria). only biofuel feedstock affected this criterion is palm oil. We employ computable general equilibrium (CGE) model DART‐BIO scenario‐based policy analysis evaluate phase‐out oil‐based biodiesel, additional soy...
Abstract Fossil derivatives of isorenieratene, an accessory pigment in brown‐colored green sulfur bacteria, are often used as tracers for photic zone anoxia through Earth's history, but their diagenetic behavior is still incompletely understood. Here, we assess the preservation isorenieratene organic‐rich shales (1.5–8.4 wt.% TOC ) from two Lower Jurassic anoxic systems (Bächental oil shale, Tyrol, Austria; Posidonia Shale, Baden‐Württemberg, Germany). Bitumens and kerogens were investigated...
Abstract. Archaean hydrothermal chert veins commonly contain abundant organic carbon of uncertain origin (abiotic vs. biotic). In this study, we analysed kerogen contained in a vein from the ca. 3.5 Ga old Dresser Formation (Pilbara Craton, Western Australia). Catalytic hydropyrolysis (HyPy) yielded n-alkanes up to n-C22, with sharp decrease abundance beyond n-C18. A very similar distribution (≤ n-C18) was observed HyPy products pre-extracted recent bacterial biomass, while abiotic compounds...
Abstract The emergence and diversification of eukaryotes during the Proterozoic is one most fundamental evolutionary developments in Earth’s history. ca. 1-billion-year-old Lakhanda Lagerstätte (Siberia, Russia) contains a wealth eukaryotic body fossils offers an important glimpse into their ecosystem. Seeking to complement paleontological record this remarkable lagerstätte, we here explored information encoded within sedimentary organic matter (total carbon = 0.01–1.27 wt.%). Major emphasis...
Abstract Deep fracture‐hosted fluids of Precambrian bedrock cratons are relatively stagnant over long time spans compared to near‐surface systems. However, episodic events, such as fracture reactivations, transgressions, and deglaciations, may introduce dilute water, replacing, mixing with the deep continental brines, thereby sparking microbial activity. Secondary minerals that line fractures serve important geochemical archives for events. Here we explore mineral record Archean rocks...
Abstract. Organic matter in Archean hydrothermal cherts may provide an important archive for molecular traces of earliest life on Earth. The geobiological interpretation this archive, however, requires a sound understanding organic preservation and alteration systems. Here we report (including biosignatures) enclosed hydrothermally influenced the Pleistocene Lake Magadi (Kenya; High Beds Green Beds) – analogs cherts. contain low carbon (
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