A5036532218- Paleontology and Stratigraphy of Fossils
- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Methane Hydrates and Related Phenomena
- Geological and Geophysical Studies
- Hydrocarbon exploration and reservoir analysis
- Geochemistry and Elemental Analysis
- Astro and Planetary Science
- Marine and coastal ecosystems
- Atmospheric and Environmental Gas Dynamics
- Marine Biology and Ecology Research
- Chemical Synthesis and Characterization
- Microbial Community Ecology and Physiology
- Soil Geostatistics and Mapping
- Marine and Coastal Ecosystems
- Mass Spectrometry Techniques and Applications
- Economic Zones and Regional Development
- Island Studies and Pacific Affairs
- Radiopharmaceutical Chemistry and Applications
- Geological and Geochemical Analysis
- Atmospheric Ozone and Climate
- Analytical Chemistry and Chromatography
- Marine and environmental studies
- Maritime and Coastal Archaeology
- Radioactive element chemistry and processing
University of Victoria
2021-2024
Princeton University
2017-2024
University of Copenhagen
2016-2023
Carbonate mud represents one of the most important geochemical archives for reconstructing ancient climatic, environmental, and evolutionary change from rock record. Mud also a major sink in global carbon cycle. Yet, there remains no consensus about how where carbonate is formed. Here, we present stable isotope trace-element data constituents Bahamas, including ooids, corals, foraminifera, algae. We use fingerprinting to demonstrate that cannot be sourced abrasion mixture any combination...
Abstract The pairing of calcium and magnesium isotopes (δ44/40Ca, δ26Mg) has recently emerged as a useful tracer to understand the environmental information preserved in shallow-marine carbonates. Here, we applied Ca Mg isotopic framework, along with analyses carbon lithium isotopes, late Tonian dolostones, infer seawater chemistry across this critical interval Earth history. We investigated ca. 735 Ma Coppercap Formation northwestern Canada, unit that preserves large shifts carbonate δ13C...
Geobiology explores how Earth's system has changed over the course of geologic history and living organisms on this planet are impacted by or indeed causing these changes. For decades, geologists, paleontologists, geochemists have generated data to investigate topics. Foundational efforts in sedimentary geochemistry utilized spreadsheets for storage analysis, suitable several thousand samples, but not practical scalable larger, more complex datasets. As results accumulated, researchers...
The Trezona carbon isotope excursion is recorded on five different continents in platform carbonates deposited prior to the end-Cryogenian Marinoan glaciation (>635 Ma) and represents a change values of 16–18‰. Based spatial temporal reproducibility, previously has been interpreted as tracking isotopic composition dissolved inorganic global ocean before descent into snowball Earth. However, modern restricted shallow marine freshwater settings, have similarly large range, which mostly...
Abstract Stratigraphic variability in the geochemistry of sedimentary rocks provides critical data for interpreting paleoenvironmental change throughout Earth history. However, vast majority pre-Jurassic geochemical records derive from shallow-water carbonate platforms that may not reflect global ocean chemistry. Here, we used calcium isotope ratios (δ44Ca) conjunction with minor-element (Sr/Ca) and field observations to explore links among sea-level change, mineralogy, marine diagenesis...
Reconstructing the oxygenation history of Earth's oceans during Ediacaran period (635 to 539 million years ago) has been challenging, and this led a polarizing debate about environmental conditions that played host rise animals. One focal point is largest negative inorganic C-isotope excursion recognized in geologic record, Shuram excursion, whether relic tracks global-scale deep oceans. To help inform debate, we conducted detailed geochemical investigation two siliciclastic-dominated...
Abstract The temporal relationship between global glaciations and the Great Oxidation Event (GOE) suggests that climate change played an important role in Earth's oxygenation. potential of temperature is captured by stratigraphic proximity glacial deposits sediments containing mass‐independent fractionation sulfur isotopes (MIF‐S). We use a time‐dependent one‐dimensional photochemical model to investigate whether changes associated with can drive oscillations atmospheric O 2 levels MIF‐S...
The cause of the Great Oxidation Event ~2.4 billion-years-ago (Ga) is hotly debated. Recent models favor emergence continents as driving event. However, we suggest that extensive shallow-marine carbonate platforms existed in Mesoarchean. This conclusion based on Ca isotopes from 2.8 Ga rocks, constrains isotope value Mesoarchean seawater to -0.5‰ relative present day values. estimate strikingly similar pre-Mesozoic values, suggesting continental freeboard and area was relatively consistent...
Over million-year timescales, the geologic cycling of carbon controls long-term climate and oxidation Earth's surface. Inferences about cycle can be made from time series isotopic ratios measured sedimentary rocks. The foundational assumption for isotope chemostratigraphy is that values reflect dissolved inorganic in a well-mixed ocean equilibrium with atmosphere. However, when applied to shallow-water platform environments, where most ancient carbonates preserved geological record formed,...