A5046143472- Paleontology and Stratigraphy of Fossils
- Geochemistry and Elemental Analysis
- Geology and Paleoclimatology Research
- Hydrocarbon exploration and reservoir analysis
- Methane Hydrates and Related Phenomena
- Geological and Geochemical Analysis
- Marine Biology and Ecology Research
- Radioactive element chemistry and processing
- Geological and Geophysical Studies
- Geochemistry and Geologic Mapping
- Isotope Analysis in Ecology
- Marine and coastal ecosystems
- Geological Studies and Exploration
- Geological formations and processes
- Heavy metals in environment
- Marine and environmental studies
- Mine drainage and remediation techniques
- Groundwater and Isotope Geochemistry
- Microbial Community Ecology and Physiology
- Iron oxide chemistry and applications
- Paleontology and Evolutionary Biology
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- Atmospheric and Environmental Gas Dynamics
- Hydraulic Fracturing and Reservoir Analysis
University of Leeds
2016-2025
China University of Geosciences
2021-2024
Novelis (Canada)
2023
Diagnostics for the Real World (United Kingdom)
2022
Carl von Ossietzky Universität Oldenburg
2016
Newcastle University
2006-2014
Queen Alexandra Hospital
2011
University of Maryland, College Park
2009
NIST Center for Neutron Research
2009
National Institute of Standards and Technology
2009
Because animals require oxygen, an increase in late-Neoproterozoic oxygen concentrations has been suggested as a stimulus for their evolution. The iron content of deep-sea sediments shows that the deep ocean was anoxic and ferruginous before during Gaskiers glaciation 580 million years ago it became oxic afterward. first known members Ediacara biota arose shortly after glaciation, suggesting causal link between evolution this oxygenation event. A prolonged stable environment may have...
Research Article| April 01, 2011 Ferruginous Conditions: A Dominant Feature of the Ocean through Earth's History Simon W. Poulton; Poulton 1School Civil Engineering and Geosciences, Newcastle University Drummond Building, upon Tyne NE1 7RU, UK E-mail: s.w.poulton@ncl.ac.uk Search for other works by this author on: GSW Google Scholar Donald E. Canfield 2Nordic Centre Earth Evolution Institute Biology Southern Denmark, 5230 Odense M, Denmark dec@biology.sdu.dk Elements (2011) 7 (2): 107–112....
Earth's surface chemical environment has evolved from an early anoxic condition to the oxic state we have today. Transitional between earlier Proterozoic world with widespread deep-water anoxia and a Phanerozoic large oxygen-utilizing animals, Neoproterozoic Era [1000 542 million years ago (Ma)] plays key role in this history. The details of Earth oxygenation, however, remain unclear. We report that through much later (<742 +/- 6 Ma), remained beneath mixed layer oceans; deeper water masses...
Suspended sediments from 34 major rivers (geographically widespread) and 36 glacial meltwater streams have been examined for their variations in different operationally-defined iron fractions; Fe~HR~ (iron oxides soluble dithionite), Fe~PR~ boiling HCl but not dithionite) Fe~U~ (total less that HCl). River particulates show a close association between total (FeT), reflecting the effects of chemical weathering which derive oxide from, retain it with, iron. Consistent with this,...
Abstract The early diversification of animals (∼630 Ma), and their development into both motile macroscopic forms (∼575–565 has been linked to stepwise increases in the oxygenation Earth’s surface environment. However, establishing such a linkage between oxygen evolution for later Cambrian ‘explosion' (540–520 Ma) new, energy-sapping body plans behaviours proved more elusive. Here we present new molybdenum isotope data, which demonstrate that areal extent oxygenated bottom waters increased...
Ocean acidification and mass extinction The largest in Earth's history occurred at the Permian-Triassic boundary 252 million years ago. Several ideas have been proposed for what devastated marine life, but scant direct evidence exists. Clarkson et al. measured boron isotopes across this period as a highly sensitive proxy seawater pH. It appears that, although oceans buffered acidifiying effects of carbon release from contemporary pulses volcanism, buffering failed when volcanism increased...
Oceanic anoxia—including euxinic settings defined by the presence of water column hydrogen sulfide (H<sub>2</sub>S)—is minor in ocean today. Such conditions, however, were common or even dominant past, particularly during Precambrian and Phanerozoic oceanic anoxic events. The latter are associated with massive petroleum mineral reserves many major extinction events paleontological record. Our ability to recognize ancient oxygen deficiencies relies strongly on data viewed combination...
Abstract Oxygen is essential for animal life, and while geochemical proxies have been instrumental in determining the broad evolutionary history of oxygen on Earth, much our insight into Phanerozoic comes from biogeochemical modelling. The GEOCARBSULF model utilizes carbon sulphur isotope records to produce most detailed atmospheric O 2 currently available. However, its predictions Paleozoic disagree with proxies, non-isotope Here we show that oversimplifies geochemistry fractionation,...
Research Article| April 16, 2018 Ocean euxinia and climate change "double whammy" drove the Late Ordovician mass extinction Caineng Zou; Zou 1China National Petroleum Corporation, Institute of Exploration & Development, 100083 Beijing, China2National Energy Shale Gas Development (Experiment) Center, 065007 Langfang, China Search for other works by this author on: GSW Google Scholar Zhen Qiu; Qiu * *E-mails: qiuzhen316@163.com; s.poulton@leeds.ac.uk Simon W. Poulton; Poulton 3School Earth...
The oceans at the start of Neoproterozoic Era (1,000-541 million years ago, Ma) were dominantly anoxic, but may have become progressively oxygenated, coincident with rise animal life. However, control that oxygen exerted on development early ecosystems remains unclear, as previous research has focussed identification fully anoxic or oxic conditions, rather than intermediate redox levels. Here we report anomalous cerium enrichments preserved in carbonate rocks across bathymetric basin...