Isotope geochemistry; Isotopic biomarkers; Biogeochemistry; Transition metals; Ocean chemistry
Köbberich M., Vance D. (2018), Zinc association with surface-bound iron-hydroxides on cultured marine diatoms: a zinc stable isotope perspective, in Marine Chemistry
, 202, 1-11.
Matthews A., Azrieli-Tal I, Ayelet B. C. Archer, Bar-Matthews M., Vance D., Poulton S.W., Almogi-Labin A. (2017), Anoxic development of Sapropel S1 in the Nile Fan inferred from redox sensitive proxies, Fe speciation, Fe and Mo isotopes, in Archer, C.
, 475, 24-39.
Kerl C., Loymayer R., Bura-Nakic E., Vance D., Planer-Friedrich B. (2017), Experimental confirmation of isotope fractionation in thiomolybdates using ion chromatographic separation and detection by multi-collector ICP-MS, in Analytical Chemistry
, 89, 3123-3129.
Köbberich M., Vance D. (2017), Kinetic control on Zn isotope signatures recorded in marine diatoms, in Geochimica et Cosmochimica Acta
, 210, 197-213.
Moynier F., Vance D., Fujii T., Savage P. (2017), The isotope geochemistry of zinc and copper, in Reviews in Mineralogy and Geochemistry
Little S.H., Vance D., McManus J., Severmann S. (2016), Critical role of continental margin sediments in the oceanic mass balance of Zn and Zn isotopes, in Geology
, 44, 207-210.
Chen X., Ling H.F., Vance D., Shields-Zhou G., Zhi M., Poulton S., Och L., Jiang S.Y., Li D., Cremonese L., Archer C. (2015), Rise to modern levels of oceanic oxygenation co-incided with the Cambrian radiation of animals, in Nature Communications
, 6, 7142.
Abouchami W., Galer S.J.G., de Baar H.J.W., Middag R., Vance D., Zhao Y., Klunder M., Mezger K., Feldman H., Andreae M.O. (2014), Biogeochemical cycling of cadmium isotopes in the Southern Ocean along the Zero Meridian, in Geochimica et Cosmochimica Acta
, 127, 348-367.
Zhao Y., Vance D., Abouchami W., de Baar H.J.W. (2014), Biogeochemical cycling of zinc and its isotopes in the Southern Ocean, in Geochimica et Cosmochimica Acta
, 125, 653-672.
Azrieli-Tal I., Matthews A., Bar-Matthews M., Vance D., Archer C., Teutsch N. (2014), Evidence from molybdenum and iron isotopes and molybdenum–uranium covariation for sulphidic bottom waters during Eastern Mediterranean sapropel S1 formation, in Earth and Planetary Science Letters
, 393, 231-242.
Cameron V., Vance D. (2014), Heavy nickel isotope compositions in rivers and the oceans, in Geochimica et Cosmochimica Acta
, 130, 12-20.
Westermann S., Vance D., Cameron V., Archer C., Robinson S.A. (2014), Heterogeneous oxygenation states in the Atlantic and Tethys oceans during Oceanic Anoxic Event 2, in Earth and Planetary Science Letters
, 404, 178-189.
Little S.H., Vance D., Walker-Brown C., Landing W.M. (2014), The oceanic mass balance of copper and zinc isotopes, investigated by analysis of their inputs and oxic output in ferromanganese crusts, in Geochimica et Cosmochimica Acta
, 125, 673-693.
Little Susan, Vance Derek, Siddall Mark, Gasson Edward (2013), A modeling assessment of the role of reversible scavenging in controlling oceanic dissolved Cu and Zn distributions, in Global Biogeochemical Cycles
, 27, 780-791.
The isotopic systems of the transition metals are a relatively new tool in geochemistry. Here we propose three sub-projects that will both further develop our fundamental understanding of these isotopic systems, and undertake work that will seek to apply them to two big scientific questions introduced below. (1) An essential part of the development of transition metal isotopes is an increased understanding and quantification of the processes that cause isotopic fractionation. Though significant progress has been made in this direction, much remains to be done. Here, we will undertake experiments aimed at understanding both abiotic and biotic isotopic fractionations in the oceans. Scavenging to marine particulate matter (i.e. sorption to particulate surfaces) represents an important output of transition metals from the seawater solution, and sets the isotopic composition of the chemical sediments that are often used as records of the isotopic history of seawater. We will collaborate with surface chemists in experiments that will characterise the isotopic composition of Cu, Zn, Mo and Ni sorbed to a range of particulate types (Fe-Mn oxyhydroxides, biogenic opal and calcite, particulate organic carbon). In addition, in collaboration with experts in culturing, we will also further characterise isotopic fractionations of these metals upon uptake into the cells of groups of organisms that are important to the biogeochemistry of both the modern and ancient oceans.(2) The transition metals limit the growth of marine phytoplankton in large part of the oceans, including the Southern Ocean and the North Pacific. Thus, they partially control the sequestration of carbon from the atmosphere to the ocean, and it has been suggested that increased availability of trace metals caused the swings in atmospheric CO2 that have characterised the recent glacial-interglacial cycles. In combination with the work on fractionation processes from the first sub-project, data on isotopic patterns in the modern ocean has already shed light on the internal cycling of trace metals in the ocean, and has the potential to reveal much more. We will pursue this in collaboration with a large international project (GEOTRACES) through which we can obtain large seawater samples for isotopic analysis, for which the methodology is now routine in our laboratory. We will build on work we have already done to apply our understanding of the modern ocean to the recent past, through the building of records of isotopic compositions derived from sediments.(3) Recent genomic work on metalloproteomes has suggested that the early biosphere on Earth used different metals as it evolved. This work has suggested the possibility that trace metal isotope signatures in the rock record could be used to track this evolution, so that there is potential to place more secure chronological constraints on the advent of different groups, both important in themselves but also crucial to the evolution of the abiotic surface Earth (for example, the evolution of oxygenic photosynthesis and the appearance of O2 in the Earth’s atmosphere, the greenhouse gas chemistry of the atmosphere). Here we propose to quantify the isotopic fractionations caused by the evolving biosphere with a record of paired isotopic analyses of kerogen (the remains of the biosphere in rocks) and recorders of the oceanic isotopic composition through time, to test currently controversial ideas about the timing of the evolution of key groups of organisms on the early Earth and their impact on its surface environment of the Earth.