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Outputs (14)

High rates of rock organic carbon oxidation sustained as Andean sediment transits the Amazon foreland-floodplain (2023)
Journal Article
Dellinger, M., Hilton, R. G., Baronas, J. J., Torres, M. A., Burt, E. I., Clark, K. E., …West, A. J. (2023). High rates of rock organic carbon oxidation sustained as Andean sediment transits the Amazon foreland-floodplain. Proceedings of the National Academy of Sciences, 120(39), Article e2306343120. https://doi.org/10.1073/pnas.2306343120

The oxidation of organic carbon contained within sedimentary rocks (“petrogenic” carbon, or hereafter OCpetro) emits nearly as much CO2 as is released by volcanism, thereby playing a key role in the long-term global C budget. High erosion rates in mo... Read More about High rates of rock organic carbon oxidation sustained as Andean sediment transits the Amazon foreland-floodplain.

Hydrological control of river and seawater lithium isotopes (2022)
Journal Article
Zhang, F., Dellinger, M., Hilton, R. G., Yu, J., Allen, M. B., Densmore, A. L., …Jin, Z. (2022). Hydrological control of river and seawater lithium isotopes. Nature Communications, 13(1), Article 3359. https://doi.org/10.1038/s41467-022-31076-y

Seawater lithium isotopes (δ7Li) record changes over Earth history, including a ∼9‰ increase during the Cenozoic interpreted as reflecting either a change in continental silicate weathering rate or weathering feedback strength, associated with tecton... Read More about Hydrological control of river and seawater lithium isotopes.

Concentration‐discharge relationships of dissolved rhenium in Alpine catchments reveal its use as a tracer of oxidative weathering (2021)
Journal Article
Hilton, R. G., Turowski, J. M., Winnick, M., Dellinger, M., Schleppi, P., Williams, K. H., …Hayton, A. (2021). Concentration‐discharge relationships of dissolved rhenium in Alpine catchments reveal its use as a tracer of oxidative weathering. Water Resources Research, 57(11), Article e2021WR029844. https://doi.org/10.1029/2021wr029844

Oxidative weathering of sedimentary rocks plays an important role in the global carbon cycle. Rhenium (Re) has been proposed as a tracer of rock organic carbon (OCpetro) oxidation. However, the sources of Re and its mobilization by hydrological proce... Read More about Concentration‐discharge relationships of dissolved rhenium in Alpine catchments reveal its use as a tracer of oxidative weathering.

Fractionation of rhenium isotopes in the Mackenzie River basin during oxidative weathering (2021)
Journal Article
Dellinger, M., Hilton, R. G., & Nowell, G. M. (2021). Fractionation of rhenium isotopes in the Mackenzie River basin during oxidative weathering. Earth and Planetary Science Letters, 573, Article 117131. https://doi.org/10.1016/j.epsl.2021.117131

Rhenium (Re) is a trace element whose redox chemistry makes it an ideal candidate to trace a range of geochemical processes. Here, we report the first rhenium isotopic measurements (Re) from river-borne materials to assess the influence of chemical w... Read More about Fractionation of rhenium isotopes in the Mackenzie River basin during oxidative weathering.

Temperature control on CO2 emissions from the weathering of sedimentary rocks (2021)
Journal Article
Soulet, G., Hilton, R. G., Garnett, M. H., Roylands, T., Klotz, S., Croissant, T., …Le Bouteiller, C. (2021). Temperature control on CO2 emissions from the weathering of sedimentary rocks. Nature Geoscience, 14(9), 665-671. https://doi.org/10.1038/s41561-021-00805-1

Sedimentary rocks can release carbon dioxide (CO2) during the weathering of rock organic carbon and sulfide minerals. This sedimentary carbon could act as a feedback on Earth’s climate over millennial to geological timescales, yet the environmental c... Read More about Temperature control on CO2 emissions from the weathering of sedimentary rocks.

Constraints on the source of reactive phases in sediment from a major Arctic river using neodymium isotopes (2021)
Journal Article
Larkin, C. S., Piotrowski, A. M., Hindshaw, R. S., Bayon, G., Hilton, R. G., Baronas, J. J., …Tipper, E. T. (2021). Constraints on the source of reactive phases in sediment from a major Arctic river using neodymium isotopes. Earth and Planetary Science Letters, 565, Article 116933. https://doi.org/10.1016/j.epsl.2021.116933

Riverine suspended particulate matter (SPM) is essential for the delivery of micronutrients such as iron (Fe) to the oceans. SPM is known to consist of multiple phases with differing reactivity, but their role in the delivery of elements to the ocean... Read More about Constraints on the source of reactive phases in sediment from a major Arctic river using neodymium isotopes.

Measurements of rhenium isotopic composition in low-abundance samples (2020)
Journal Article
Dellinger, M., Hilton, R. G., & Nowell, G. M. (2020). Measurements of rhenium isotopic composition in low-abundance samples. Journal of Analytical Atomic Spectrometry, 35(2), 377-387. https://doi.org/10.1039/c9ja00288j

Rhenium (Re) is a trace element whose redox chemistry makes it an ideal candidate to trace a range of geochemical processes. In particular, fractionation of its isotopes 187Re (62.6% abundance) and 185Re (37.4%) may be used to improve our understandi... Read More about Measurements of rhenium isotopic composition in low-abundance samples.

Preservation of organic carbon during active fluvial transport and particle abrasion (2019)
Journal Article
Scheingross, J., Hovius, N., Dellinger, M., Hilton, R., Repasch, M., Sachse, D., …Turowski, J. (2019). Preservation of organic carbon during active fluvial transport and particle abrasion. Geology, 47(10), 958-962. https://doi.org/10.1130/g46442.1

Oxidation of particulate organic carbon (POC) during fluvial transit releases CO2 to the atmosphere and can influence global climate. Field data show large POC oxidation fluxes in lowland rivers; however, it is unclear if POC losses occur predominant... Read More about Preservation of organic carbon during active fluvial transport and particle abrasion.

Carbon dioxide emissions by rock organic carbon oxidation and the net geochemical carbon budget of the Mackenzie River Basin (2019)
Journal Article
Horan, K., Hilton, R., Dellinger, M., Tipper, E., Galy, V., Calmels, D., …Burton, K. (2019). Carbon dioxide emissions by rock organic carbon oxidation and the net geochemical carbon budget of the Mackenzie River Basin. American journal of science (1880), 319(6), 473-499. https://doi.org/10.2475/06.2019.02

The exposure of organic carbon in rocks to oxidative weathering can release carbon dioxide (CO2) to the atmosphere and consume atmospheric oxygen. Alongside volcanism, metamorphism, and the weathering of carbonate minerals by sulfuric acid, this is a... Read More about Carbon dioxide emissions by rock organic carbon oxidation and the net geochemical carbon budget of the Mackenzie River Basin.