Sune G. Nielsen
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View article: Dynamic deep marine oxygenation during the Early and Middle Paleozoic
Dynamic deep marine oxygenation during the Early and Middle Paleozoic Open
The Early Paleozoic radiation of diverse animal life is commonly connected to a well-ventilated global ocean. Yet the oxygenation history of Paleozoic deep oceans remains debated. Using thallium (Tl) isotope ratios in deep-marine mudrocks,…
View article: Evolution of the South Pacific's Iron Cycle Over the Cenozoic
Evolution of the South Pacific's Iron Cycle Over the Cenozoic Open
Iron (Fe) availability impacts marine primary productivity, potentially influencing the efficiency of the biological carbon pump. Stable Fe isotope analysis has emerged as a tool to understand how Fe is sourced and cycled in the water colu…
View article: Ocean Oxygenation Changes in the Arabian Sea Oxygen Minimum Zone During the Penultimate Glacial Cycle
Ocean Oxygenation Changes in the Arabian Sea Oxygen Minimum Zone During the Penultimate Glacial Cycle Open
Reconstructing past oxygen fluctuations in oxygen minimum zones (OMZs) is crucial for understanding their response to climate change. Numerous studies suggest better oxygenation in the Arabian Sea OMZ during the Last Glacial Maximum (LGM) …
View article: Thallium cycling and boundary exchange in a continental margin basin
Thallium cycling and boundary exchange in a continental margin basin Open
View article: Mélange dehydration and melting beneath South Sandwich Islands arc
Mélange dehydration and melting beneath South Sandwich Islands arc Open
View article: Calculating Sedimentation Rates of Oxic Pelagic Clays Using Core Top Thorium Isotopes
Calculating Sedimentation Rates of Oxic Pelagic Clays Using Core Top Thorium Isotopes Open
Oxic pelagic clays are an important component of seafloor sediment that may hold valuable information about past ocean chemistry due to their affinity for and accumulation of biogeochemically important metals. We present a new approach to …
View article: Deep Nitrogen Fluxes and Sources Constrained by Arc Lava Phenocrysts
Deep Nitrogen Fluxes and Sources Constrained by Arc Lava Phenocrysts Open
Nitrogen (N) dominates Earth's atmosphere (78% N 2 ) but occurs in trace abundances in silicate minerals, making it a sensitive tracer of recycled surface materials into the mantle. The mechanisms controlling N transfer between terrestrial…
View article: Living in Their Heyday: Iron‐Oxidizing Bacteria Bloomed in Shallow‐Marine, Subtidal Environments at ca. 1.88 Ga
Living in Their Heyday: Iron‐Oxidizing Bacteria Bloomed in Shallow‐Marine, Subtidal Environments at ca. 1.88 Ga Open
The majority of large iron formations (IFs) were deposited leading up to Earth's great oxidation episode (GOE). Following the GOE, IF deposition decreased for almost 500 Myr. Subsequently, around 1.88 Ga, there was widespread deposition of…
View article: Magnesium isotope fractionation processes during seafloor serpentinization and implications for serpentinite subduction
Magnesium isotope fractionation processes during seafloor serpentinization and implications for serpentinite subduction Open
Studies of magnesium (Mg) isotope ratios in subduction zone lavas have revealed small but significant offsets from the mantle value with enrichments in the heavy isotopes. However, the very high concentration of Mg in the mantle contrasts …
View article: Distribution and Drivers of Organic Carbon Sedimentation Along the Continental Margins
Distribution and Drivers of Organic Carbon Sedimentation Along the Continental Margins Open
Organic carbon (OC) sedimentation in marine sediments is the largest long‐term sink of atmospheric CO 2 after silicate weathering. Understanding the mechanistic and quantitative aspects of OC delivery and preservation in marine sediments i…
View article: Onset of coupled atmosphere–ocean oxygenation 2.3 billion years ago
Onset of coupled atmosphere–ocean oxygenation 2.3 billion years ago Open
View article: Global oceanic oxygenation controlled by the Southern Ocean through the last deglaciation
Global oceanic oxygenation controlled by the Southern Ocean through the last deglaciation Open
Ocean dissolved oxygen (DO) can provide insights on how the marine carbon cycle affects global climate change. However, the net global DO change and the controlling mechanisms remain uncertain through the last deglaciation. Here, we presen…
View article: Global oceanic oxygenation controlled by the Southern Ocean through the last deglaciation
Global oceanic oxygenation controlled by the Southern Ocean through the last deglaciation Open
Data processing codes written in Matlab. eTl_loessfit.m: producing Loess fit for the Tl isotope record (Fig. 1) pco2_eTl_correlation.m: producing the correlation and cross-correlation between the atmospheric CO2 (Bereitner et al., 2015) an…
View article: Global oceanic oxygenation controlled by the Southern Ocean through the last deglaciation
Global oceanic oxygenation controlled by the Southern Ocean through the last deglaciation Open
Data processing codes written in Matlab. eTl_loessfit.m: producing Loess fit for the Tl isotope record (Fig. 1) pco2_eTl_correlation.m: producing the correlation and cross-correlation between the atmospheric CO2 (Bereitner et al., 2015) an…
View article: Supplementary material to "Magnesium isotope fractionation processes during seafloor serpentinization and implications for serpentinite subduction"
Supplementary material to "Magnesium isotope fractionation processes during seafloor serpentinization and implications for serpentinite subduction" Open
View article: Magnesium isotope fractionation processes during seafloor serpentinization and implications for serpentinite subduction
Magnesium isotope fractionation processes during seafloor serpentinization and implications for serpentinite subduction Open
Studies of magnesium (Mg) isotope ratios in subduction zone lavas have revealed small, but significant offsets from the mantle value with enrichments in the heavy isotopes. However, the very high concentration of Mg in the mantle contrasts…
View article: Tungsten isotopes in Baffin Island lavas: Evidence of Iceland plume evolution
Tungsten isotopes in Baffin Island lavas: Evidence of Iceland plume evolution Open
Tungsten and helium isotope ratios in lavas derived from deeply rooted mantle plumes are tracers of lower mantle compositional heterogeneity or core-mantle exchange.We measured the tungsten isotopic compositions of lavas with exceptionally…
View article: Spectroscopic Data for Thallium Sorbed to Manganese Oxides
Spectroscopic Data for Thallium Sorbed to Manganese Oxides Open
This dataset includes X-ray diffraction (XRD), Raman spectroscopy, and X-ray absorption near edge structure (XANES) data from Phillips et al. (2023)- "The role of manganese oxide mineralogy in thallium isotopic fractionation upon sorption"…
View article: Spectroscopic Data for Thallium Sorbed to Manganese Oxides
Spectroscopic Data for Thallium Sorbed to Manganese Oxides Open
This dataset includes X-ray diffraction (XRD), Raman spectroscopy, and X-ray absorption near edge structure (XANES) data from Phillips et al. (2023)- "The role of manganese oxide mineralogy in thallium isotopic fractionation upon sorption"…
View article: Degassing of early-formed planetesimals restricted water delivery to Earth
Degassing of early-formed planetesimals restricted water delivery to Earth Open
The timing of delivery and the types of body that contributed volatiles to the terrestrial planets remain highly debated1,2. For example, it is unknown if differentiated bodies, such as that responsible for the Moon-forming gian…
View article: The oxic uranium flux and isotope fractionation in modern deep-sea sediments
The oxic uranium flux and isotope fractionation in modern deep-sea sediments Open
View article: Olivine and pyroxene-hosted fluid inclusions record high arc nitrogen fluxes and multiple slab sources
Olivine and pyroxene-hosted fluid inclusions record high arc nitrogen fluxes and multiple slab sources Open
View article: Triple Fe isotopic behavior in an expanded array of modern aqueous environments
Triple Fe isotopic behavior in an expanded array of modern aqueous environments Open
View article: Driving mechanisms of correlated thallium isotopic compositions and oxygen penetration depth in modern marine sediments
Driving mechanisms of correlated thallium isotopic compositions and oxygen penetration depth in modern marine sediments Open
View article: Congruent oxygen fluctuations in Earth’s atmosphere and oceans across the GOE
Congruent oxygen fluctuations in Earth’s atmosphere and oceans across the GOE Open
View article: Anomalous vanadium isotopes in Baffin Island lavas: Evidence of core-mantle exchange?
Anomalous vanadium isotopes in Baffin Island lavas: Evidence of core-mantle exchange? Open
Mantle plumes with higher 3 He/ 4 He than the upper mantle imply solar-like gases captured during planetary accretion are preserved in the deep Earth, possibly in the outer core [1].We hypothesize that, if mantle plumes entrain core-derive…
View article: Re-evaluating bulk H measurements of aubrites using secondary ion mass spectrometry
Re-evaluating bulk H measurements of aubrites using secondary ion mass spectrometry Open
View article: Marine sedimentary uranium to barium ratios as a potential quantitative proxy for Pleistocene bottom water oxygen concentrations
Marine sedimentary uranium to barium ratios as a potential quantitative proxy for Pleistocene bottom water oxygen concentrations Open
Oxygen is essential for marine ecosystems, and it is linked by respiration to carbon storage in the deep ocean. Reconstructing oxygen concentrations in the past has been limited by the absence of quantitative, rather than qualitative, prox…
View article: Sponge-rich sediment recycling in a Paleozoic continental arc driven by mélange melting
Sponge-rich sediment recycling in a Paleozoic continental arc driven by mélange melting Open
Slab material transfer processes in continental arcs can be challenging to decipher because magmas are often characterized by significant contributions from continental material. In this study, we identified a Prototethyan continental arc …
View article: Sources of dehydration fluids underneath the Kamchatka arc
Sources of dehydration fluids underneath the Kamchatka arc Open