Search Results - "O'Nions, R.K"

Determination of natural Cu-isotope variation by plasma-source mass spectrometry: implications for use as geochemical tracers by Zhu, X.K., O'Nions, R.K., Guo, Y., Belshaw, N.S., Rickard, D.

“…Techniques for the high precision measurement of 65Cu/ 63Cu ratios by multiple-collector plasma-source mass spectrometry has been developed. Two approaches,…”
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Zonation of monazite in metamorphic rocks and its implications for high temperature thermochronology: a case study from the Lewisian terrain by Zhu, X.K, O'Nions, R.K

“…Monazite is a valuable chronometer for many geological processes, and a proper interpretation for the age derived from monazite requires an adequate…”
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Nd- and Pb-isotope time series from Atlantic ferromanganese crusts: implications for changes in provenance and paleocirculation over the last 8 Myr by Reynolds, B.C., Frank, M., O'Nions, R.K.

“…High-resolution Nd- and Pb-isotope time series for the last 8 Myr are reported for four Atlantic ferromanganese crusts, dated by 10Be/ 9Be chronology. These…”
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The Hf isotope composition of global seawater and the evolution of Hf isotopes in the deep Pacific Ocean from Fe–Mn crusts by David, K, Frank, M, O'Nions, R.K, Belshaw, N.S, Arden, J.W

“…This paper presents a revised chemical purification method of Hf for the measurement of Hf isotope ratios of Fe–Mn crusts on a new generation of double…”
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Secular variation of Nd and Pb isotopes in ferromanganese crusts from the Atlantic, Indian and Pacific Oceans by O'Nions, R.K, Frank, M, von Blanckenburg, F, Ling, H.-F

“…Two ferromanganese crusts from the Indian Ocean and one from the Atlantic Ocean have been analysed for 10Be/ 9Be, 143Nd/ 144Nd and 208,207,206Pb/ 204Pb ratios…”
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Evolution of Nd and Pb isotopes in Central Pacific seawater from ferromanganese crusts by Ling, H.F., Burton, K.W., O'Nions, R.K., Kamber, B.S., von Blanckenburg, F., Gibb, A.J., Hein, J.R.

“…Hydrogenetic ferromanganese crusts incorporate elements from ambient seawater during their growth on seamounts. By analysing Nd, Pb and Be isotope profiles…”
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Sources of Pb for Indian Ocean ferromanganese crusts: a record of Himalayan erosion? by Frank, M, O'Nions, R.K

“…A high resolution Pb isotope time-series for the last 26 Ma, dated by 10Be/ 9Be chronology, is reported for a north Indian Ocean ferromanganese crust. This…”
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Lewisian crustal history from in situ SIMS mineral chronometry and related metamorphic textures by Zhu, Z.K., O'Nions, R.K., Belshaw, N.S., Gibb, A.J.

“…A combination of detailed petrography and in situ SIMS 207 Pb 206 Pb micro-chronometry of monazite has been carried out on samples from the Lewisian high-grade…”
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Global distribution of beryllium isotopes in deep ocean water as derived from FeMn crusts by von Blanckenburg, F., O'Nions, R.K., Belshaw, N.S., Gibb, A., Hein, J.R.

“…The direct measurement of the ratio of cosmogenic 10Be ( T 1 2 = 1.5 Ma ) to stable terrigenously sourced 9Be in deep seawater or marine deposits can be used…”
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Significance of in situ SIMS chronometry of zoned monazite from the Lewisian granulites, northwest Scotland by Zhu, X.K., O'Nions, R.K., Belshaw, N.S., Gibb, A.J.

“…In situ studies of Lewisian metamorphic monazites show them to be strongly zones in Th content, Th U ratio and 207 Pb 206 Pb age. Traverses across…”
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Mass fractionation processes of transition metal isotopes by Zhu, X.K., Guo, Y., Williams, R.J.P., O’Nions, R.K., Matthews, A., Belshaw, N.S., Canters, G.W., de Waal, E.C., Weser, U., Burgess, B.K., Salvato, B.

“…Recent advances in mass spectrometry make it possible to utilise isotope variations of transition metals to address some important issues in solar system and…”
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High precision measurement of iron isotopes by plasma source mass spectrometry by Belshaw, N.S, Zhu, X.K, Guo, Y, O’Nions, R.K

“…Multiple-collector inductively coupled plasma mass spectrometry has been used for the precise measurement of natural variations in the isotopic composition of…”
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Distribution and sources of pre-anthropogenic lead isotopes in deep ocean water from FeMn crusts by von Blanckenburg, F., O'nions, R.K., Heinz, J.R.

“…The lead isotope composition of ocean water is not well constrained due to contamination by anthropogenic lead. Here the global distribution of lead isotopes…”
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Rates of uplift investigated through 230Th dating in the Gulf of Corinth (Greece) by Dia, A.N, Cohen, A.S, O'Nions, R.K, Jackson, J.A

“…The Sr, U and Th isotope compositions of fourteen coral samples from raised terraces on the south side of the Gulf of Corinth, Greece, have been analysed by…”
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60 Myr records of major elements and Pb–Nd isotopes from hydrogenous ferromanganese crusts: reconstruction of seawater paleochemistry by Frank, M, O'Nions, R K, Hein, J R, Banakar, V K

“…We compare the time series of major element geochemical and Pb- and Nd-isotopic composition obtained for seven hydrogenous ferromanganese crusts from the…”
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Utility of scarcity by O'Nions, R.K

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High precision measurement of titanium isotope ratios by plasma source mass spectrometry by Zhu, X.K., Makishima, A., Guo, Y., Belshaw, N.S., O’Nions, R.K.

“…A method using multiple-collector inductively coupled plasma source mass spectrometry for the precise measurement of Ti isotope composition in natural…”
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The fate of mantle-derived carbon in a continental sedimentary basin: Integration of [formula omitted] relationships and stable isotope signatures by Sherwood Lollar, B., Ballentine, C.J., Onions, R.K.

“…The isotopic composition and abundances of the rare gases (He, Ne, and Ar) and active gases (CO 2, CH 4) have been determined in a series of commercial gas…”
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Erratum to “Limits on the mass flux between the lower and upper mantle and stability of layering” [Earth Planet. Sci. Lett. 139 (1996) 213–222] by O'Nions, R.K., Tolstikhin, I.N.

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Limits on the mass flux between lower and upper mantle and stability of layering by O'Nions, R.K., Tolstikhin, I.N.

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