A5035675644- Geology and Paleoclimatology Research
- Paleontology and Stratigraphy of Fossils
- Methane Hydrates and Related Phenomena
- Geological and Geochemical Analysis
- Geological and Geophysical Studies
- Geological formations and processes
- Geochemistry and Elemental Analysis
- Hydrocarbon exploration and reservoir analysis
- Evolution and Paleontology Studies
- Reservoir Engineering and Simulation Methods
- Advanced Database Systems and Queries
- Seismic Imaging and Inversion Techniques
- Isotope Analysis in Ecology
- Logic, Reasoning, and Knowledge
- Geochemistry and Geologic Mapping
- Geomagnetism and Paleomagnetism Studies
- Mercury impact and mitigation studies
- Semantic Web and Ontologies
- Astro and Planetary Science
- Pleistocene-Era Hominins and Archaeology
- Logic, programming, and type systems
- Data Management and Algorithms
- Marine and environmental studies
- Atmospheric and Environmental Gas Dynamics
- Formal Methods in Verification
China University of Geosciences
2018-2025
State Key Laboratory of Biogeology and Environmental Geology
2024
University of Aberdeen
2015-2019
The Open University
2005-2016
University of Cambridge
2009-2016
University College London
2011-2014
University at Albany, State University of New York
2013
Hong Kong Metropolitan University
2012
The University of Melbourne
1973-2002
RMIT University
1994
Abstract Climate change is a critical factor affecting biodiversity. However, the quantitative relationship between temperature and extinction unclear. Here, we analyze magnitudes rates of marine fossils through past 450 million years (Myr). The results show that both rate magnitude are significantly positively correlated with animals. Major mass extinctions in Phanerozoic can be linked to thresholds climate (warming or cooling) equate >5.2 °C >10 °C/Myr. significant still exists when...
Although the Earth's environment is constantly changing, there have been a few unusual episodes over last c . 200 Ma when change was extreme in terms of its rapidity, severity, long-lasting consequences and unpredictability. The geochemical biotic records for two these episodes, Palaeocene–Eocene thermal maximum Toarcian Oceanic Anoxic Event (Early Jurassic), possess many significant similarities. Each event associated with major carbon isotope excursion, levels extinctions, severe global...
During the early Toarcian (∼183 Ma ago), a high rate of organic carbon burial globally over brief interval time has led to recognition major oceanic anoxic event (OAE). A pronounced negative excursion in carbon‐isotope composition marine matter, carbonate and terrestrial plant material is key feature this but precise timescale cause(s) isotopic anomaly are debated. Associated with evidence for coeval rise seawater palaeotemperature, an increase continental weathering rates, mass extinction...
Abstract. Oceanic anoxic events were time intervals in the Mesozoic characterized by widespread distribution of marine organic matter-rich sediments (black shales) and significant perturbations global carbon cycle. These are globally recorded as isotope excursions irrespective lithology depositional environment. During early Toarcian, black shales deposited on epi- pericontinental shelves Pangaea, these sedimentary rocks associated with a pronounced (ca. 7 ‰) negative (organic) excursion...
Cyclostratigraphy is an important tool for understanding astronomical climate forcing and reading geological time in sedimentary sequences, provided that imprint of insolation variations caused by Earth's orbital eccentricity, obliquity and/or precession preserved (Milankovitch forcing). Numerous stratigraphic paleoclimate studies have applied cyclostratigraphy, but the robustness methodology its dependence on investigator not been systematically evaluated. We developed Intercomparison...
Humans are primary agents of geomorphic change, and rates anthropogenic landscape change likely far exceed the pace expected from natural geologic processes. Nevertheless, our understanding impact humans on is limited by difficulties in accurately comparing past present across wide spatial temporal scales. Here, we a compilation >4000 alluvial sediment accumulation that provide an indirect record North American erosion, mass transfer storage late Pleistocene to day. Continent-wide alluvium...
The early Toarcian oceanic anoxic event (OAE) was a significant palaeoenvironmental perturbation that led to marked changes in ocean chemistry and climate, which also had long-lasting impact on marine ecosystems. global significance of the has been recognised from widespread occurrence ~ 3–7‰ negative excursion carbon-isotope (δ13C) composition organic inorganic matter terrestrial plant material. This feature is indicative pronounced carbon cycle; an inference further supported by evidence...
Abstract Recently observed rates of environmental change are typically much higher than those inferred for the geological past. At same time, magnitudes ancient changes were often substantially greater established in recent history. The most pertinent disparity, however, between and is timespan over which measured, differ by several orders magnitude. Here we show that marked temperature from proxy data Earth history scale with measurement as an approximate power law across nearly six...
Abstract Silicate weathering represents a major feedback mechanism in the Earth’s climate system, helping to stabilize atmospheric CO2 levels and temperature on million-year time scales. On shorter scales of greater relevance understanding fate anthropogenic CO2, efficacy responsiveness is less clear. Here, we present high-resolution osmium-isotope data that reflect global chemical from stratigraphically thick record early Toarcian oceanic anoxic event (T-OAE; ca. 182 Ma). A pronounced...
Antarctic bottom water (AABW) production is a key factor governing global ocean circulation, and the present disintegration of Ice Sheet slows it. However, its long-term variability has not been well documented. On basis high-resolution chemical scanning well-dated marine ferromanganese nodule from eastern Pacific, we derive record abyssal ventilation spanning past 4.7 million years evaluate linkage to AABW formation over this period. We find that was relatively weak in early Pliocene...
Abstract Procedures used to define an international chronostratigraphic stage boundary and locate ratify a Global Boundary Stratotype Section Point (GSSP) are outlined. A majority of current GSSPs use biostratigraphic data as primary markers with no reference any physico-chemical markers, despite the International Subcommission on Stratigraphic Classification (ISSC) suggestion that such should be included if possible. It is argued definitions will not produce high-precision Phanerozoic time...
Abstract The recognition of astronomically forced (Milankovitch) climate cycles in geological archives marked a major advance Earth science, revealing heartbeat within the system general importance and key utility. Power spectral analysis is primary tool used to facilitate identification astronomical stratigraphic data, but commonly employed methods for testing statistical significance relatively high narrow‐band variance potential origin spectra have been criticized inadequately balancing...