A5050324042- Paleontology and Stratigraphy of Fossils
- Geology and Paleoclimatology Research
- Hydrocarbon exploration and reservoir analysis
- Geological and Geochemical Analysis
- Methane Hydrates and Related Phenomena
- Geochemistry and Elemental Analysis
- Geological and Geophysical Studies Worldwide
- Geological Studies and Exploration
- Paleontology and Evolutionary Biology
- Geological and Geophysical Studies
- Evolution and Paleontology Studies
- Geochemistry and Geologic Mapping
- Geological formations and processes
- Engineering Diagnostics and Reliability
- Ichthyology and Marine Biology
- Marine Biology and Ecology Research
- Coastal and Marine Management
- Marine and environmental studies
- Astro and Planetary Science
- Microbial Community Ecology and Physiology
- Geomagnetism and Paleomagnetism Studies
- Ocean Acidification Effects and Responses
- Cryospheric studies and observations
- Mercury impact and mitigation studies
- Radioactive element chemistry and processing
Kiel University
2015-2024
Institute of Geosciences
2022
In this paper, we use molecular paleothermometry, based on the TEX86 proxy derived from fossilized archaeal lipids, to reconstruct absolute sea surface temperatures (SSTs) for northwest Tethys Shelf during late Pliensbachian early Toarcian (Early Jurassic, ~183 Ma) stages. Our composite record outcrops in Spain and Italy reveals that tropical SSTs varied between 22 32 °C over a ~ 3 Myr time period, including transient temperature excursions of 5–10 magnitude with lapse rates ~0.1 °C/kyr....
Abstract Throughout Earth’s history, variations in atmospheric CO 2 concentration modulated climate. Understanding changes carbon cycle is therefore pivotal predicting consequences of recent global warming. Here, we report stable isotopes (δ 13 C) molecular land plant fossils complemented by bulk organic and inorganic fractions for early Toarcian (Early Jurassic) sediments that coincided with warming a perturbation. The perturbation expressed negative excursion the δ C records established...
Cyclostratigraphic analyses of Upper Pliensbachian and Lower Toarcian carbon-13 isotope (δ13C) data, together with radiometric dating, are used to calibrate biozones magnetic chrons in the Astronomical Time Scale (ATS). In turn, ATS is date sea-level climate cycles relation Early carbon-isotope excursion (T-CIE) Karoo-Ferrar Large Igneous Provinces. The resulting chronology however insufficiently accurate determine if these global-scale events causally related. particular, cyclostratigraphic...
Abstract The Toarcian Oceanic Anoxic Event (T-OAE, Early Jurassic) is marked by widespread marine deoxygenation and deposition of organic carbon (OC)-rich strata. genesis the T-OAE thought to be associated with environmental changes caused emission 12 C-enriched greenhouse gasses (CO 2 , CH 4 ), manifested in a negative isotope excursion (nT-CIE). nT-CIE commonly used stratigraphically define T-OAE, despite complex interrelationship different phenomena, both terms (nT-CIE T-OAE) are...
Abstract The Pliensbachian/Toarcian boundary interval represents a transition from coldhouse into hothouse climate state, involving the demise of land-based cryosphere, initiating third-order global sea-level rise. Within intensely studied Northwest Tethyan shelf region, South-German Basin has been investigated in more detail than North-German (NGB). We here provide palaeoenvironmental reconstruction Hondelage fossil excavation site located NGB employing organic, isotope, and major/trace...
Carbonate concretions are known to contain well-preserved fossils and soft tissues. Recently, biomolecules (e.g. cholesterol) molecular (biomarkers) were also discovered in a 380 million-year-old concretion, revealing their importance exceptional preservation of biosignatures. Here, we used range microanalytical techniques, biomarkers compound specific isotope analyses report the presence red white blood cell-like structures as well platelet-like structures, collagen cholesterol an...
The Early Jurassic Jenkyns Event (∼183 Ma) was characterized in terrestrial environments by global warming, perturbation of the carbon cycle, enhanced weathering and wildfires. Heating acid rain on land caused a loss forests affected diversity composition plant assemblages rest trophic web. We suggest that Event, triggered activity Karoo-Ferrar Large Igneous Province, pivotal remodelling ecosystems, including plants dinosaurs. Macroplant palynological data show reductions richness conifers,...
Abstract The historical view of an equable Jurassic greenhouse world has been challenged by recent studies documenting recurrent alternation between contrasting climate modes. Cooling high-latitudinal areas may have caused orogenic processes at the northern margin Tethys Ocean that reduced heat transport towards polar regions. Warm phases correlate to periods intensified volcanism. Jenkyns Event occurred during transition from a late Pliensbachian icehouse into early Toarcian greenhouse....
The late Pliensbachian–early Toarcian δ13Corg in the Mochras Core (UK) consists of segments (rising and falling limbs, valleys, plateaus) that correlate to coeval Europe America. global were dated with cyclostratigraphic analysis U-Pb dating found be anti-correlated eustatic cycles model predicted by orbital scale glacio-eustasy. In interval 188–181 Ma five lowstands minor (<25 m), medium (25–75 m) or major (>75 sequence boundaries (SB): early margaritatus SB JPl6 (187.89 Ma); JPl7 (186.27...