Imperial College London
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Professor Mark Rehkämper

Faculty of Engineering, Department of Earth Science & Engineering

Professor of Isotope Geochemistry
 
 
 
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Contact

 

markrehk Website

 
 
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Location

 

451Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

203 results found

Rehkämper M, Schönbächler M, Andreasen R, 2012, Application of Multiple-Collector Inductively Coupled Plasma Mass Spectrometry to Isotopic Analysis in Cosmochemistry, Pages: 275-315

Journal article

Larner F, Rehkaemper M, 2012, Evaluation of Stable Isotope Tracing for ZnO Nanomaterials-New Constraints from High Precision Isotope Analyses and Modeling, ENVIRONMENTAL SCIENCE & TECHNOLOGY, Vol: 46, Pages: 4149-4158, ISSN: 0013-936X

Journal article

Rehkämper M, Wombacher F, Horner TJ, Xue Zet al., 2012, Natural and Anthropogenic Cd Isotope Variations, Advances in Isotope Geochemistry, Pages: 125-154

Cadmium is a transition metal with eight naturally occurring isotopes that have atomic mass numbers of between 106 and 116. The large Cd isotope anomalies of meteorites have been subject to investigation since the 1970s, but improvements in instrumentation and techniques have more recently enabled routine studies of the smaller stable Cd isotope fractionations that characterize various natural and anthropogenic terrestrial materials. Whilst the current database is still comparatively small, pilot studies have identified two predominant mechanisms that routinely generate Cd isotope effects – partial evaporation/condensation and biological utilization. Processes that involve evaporation and condensation appear to be largely responsible for the Cd isotope fractionations of up to 1‰ (for 114Cd/110Cd) that have been determined for industrial Cd emissions, for example from ore refineries. Cadmium isotope measurements hence hold significant promise for tracing anthropogenic sources of this highly toxic metal in the environment. The even larger Cd isotope fractionations that have been identified in the oceans (up to 4‰ for 114Cd/110Cd) are due to biological uptake and utilization of dissolved seawater Cd. This finding confirms previous work, which identified Cd as an essential marine micronutrient that exhibits a phosphate-like distribution in the oceans. The marine Cd isotope fractionations are of particular interest, as they can be used to study micronutrient cycling and its impact on ocean productivity. In addition, they may also inform on past changes in marine nutrient utilization and how these are linked to global climate, if suitable archives of seawater Cd isotope compositions can be identified.

Book chapter

Nielsen SG, Rehkämper M, 2012, Thallium Isotopes and Their Application to Problems in Earth and Environmental Science, Advances in Isotope Geochemistry, Pages: 247-269

This paper presents an account of the advances that have been made to date on the terrestrial stable isotope geochemistry of thallium (Tl). High precision measurements of Tl isotope ratios were only developed in the late 1990s with the advent of MC-ICP-MS and therefore we currently only have limited knowledge of the isotopic behavior of this element. Studies have revealed that Tl isotopes, despite their heavy masses of 203 and 205 atomic mass units, can fractionate substantially, especially in the marine environment. The most fractionated reservoirs identified are ferromanganese sediments and low temperature altered of oceanic crust. These display a total isotope variation of about 35 ε205Tl-units, which is over 50 times the analytical reproducibility of the measurement technique. The isotopic variation can be explained by invoking a combination of conventional mass dependent equilibrium isotope effects and the nuclear field shift isotope fractionation, but the specific mechanisms are still largely unaccounted for. Thallium isotopes have been applied to investigate paleoceanographic processes in the Cenozoic and there is some evidence to suggest that Tl isotopes may be utilized as a monitor of Fe and Mn supply to the water column over million year time scales. In addition, Tl isotopes can be used to calculate the magnitude of hydrothermal fluid circulation through ocean crust. Such calculations can be performed both for high and low temperature fluids. Lastly, it has been shown that marine ferromanganese sediments can be detected in mantle-derived basalts with Tl isotopes (Nature 439:314–317), which confirms that marine sediments subducted at convergent plate margins can be recycled to the surface possibly via mantle plumes.

Book chapter

Xue Z, Rehkaemper M, Schoenbaechler M, Statham PJ, Coles BJet al., 2012, A new methodology for precise cadmium isotope analyses of seawater, ANALYTICAL AND BIOANALYTICAL CHEMISTRY, Vol: 402, Pages: 883-893, ISSN: 1618-2642

Journal article

Larner F, Sampson B, Rehkamper M, Weiss D, Dainty J, O'Riodan S, Panetta T, Bain PGet al., 2012, High precision isotope measurements show poorer control of copper metabolism in Parkinsonism., Movement Disorders

Journal article

Huber L, Schoenbaechler M, Leya I, Wieler R, Theis KJ, Rehkaemper M, Benedix GKet al., 2011, THE IMPORTANCE OF COSMIC RAY EFFECTS FOR PALLADIUM-SILVER CHRONOMETRY IN IRON METEORITES: AN EVALUATION USING NOBLE GASES, 74th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A104-A104, ISSN: 1086-9379

Conference paper

Palk CS, Rehkaemper M, Andreasen R, Stunt Aet al., 2011, EXTREME CADMIUM AND THALLIUM ISOTOPE FRACTIONATIONS IN ENSTATITE CHONDRITES, 74th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A183-A183, ISSN: 1086-9379

Conference paper

Theis KJ, Schoenbaechler M, Benedix GK, Rehkaemper M, Andreasen Ret al., 2011, DATING CORE CRYSTALLIZATION OF IIAB AND IIIAB IRON METEORITES USING THE PALLADIUM-SILVER DECAY SYSTEM, 74th Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A234-A234, ISSN: 1086-9379

Conference paper

Larner F, Rehkaemper M, Coles BJ, Kreissig K, Weiss DJ, Sampson B, Unsworth C, Strekopytov Set al., 2011, A new separation procedure for Cu prior to stable isotope analysis by MC-ICP-MS, JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, Vol: 26, Pages: 1627-1632, ISSN: 0267-9477

Journal article

Rehkaemper M, Wombacher F, Horner TJ, Xue Zet al., 2011, Natural and Anthropogenic Cd Isotope Variations, HANDBOOK OF ENVIRONMENTAL ISOTOPE GEOCHEMISTRY, VOLS 1 AND 2, Editors: Baskaran, Publisher: SPRINGER-VERLAG BERLIN, Pages: 125-154, ISBN: 978-3-642-10636-1

Book chapter

Nielsen SG, Rehkaemper M, 2011, Thallium Isotopes and Their Application to Problems in Earth and Environmental Science, HANDBOOK OF ENVIRONMENTAL ISOTOPE GEOCHEMISTRY, VOLS 1 AND 2, Editors: Baskaran, Publisher: SPRINGER-VERLAG BERLIN, Pages: 247-+, ISBN: 978-3-642-10636-1

Book chapter

Arnold T, Schoenbaechler M, Rehkaemper M, Dong S, Zhao F-J, Kirk GJD, Coles BJ, Weiss DJet al., 2010, Measurement of zinc stable isotope ratios in biogeochemical matrices by double-spike MC-ICPMS and determination of the isotope ratio pool available for plants from soil, Analytical and Bioanalytical Chemistry, Vol: 398, Pages: 3115-3125, ISSN: 1618-2650

Analysis of naturally occurring isotopic variationsis a promising tool for investigating Zn transport andcycling in geological and biological settings. Here, wepresent the recently installed double-spike (DS) techniqueat the MAGIC laboratories at Imperial College London.The procedure improves on previous published DS methodsin terms of ease of measurement and precisions obtained.The analytical method involves addition of a 64Zn–67Zndouble-spike to the samples prior to digestion, separation ofZn from the sample matrix by ion exchange chromatography,and isotopic analysis by multiple-collector inductivelycoupled plasma mass spectrometry. The accuracy andreproducibility of the method were validated by analysesof several in-house and international elemental referencematerials. Multiple analyses of pure Zn standard solutionsconsistently yielded a reproducibility of about ±0.05‰(2 SD) for δ66Zn, and comparable precisions were obtainedfor analyses of geological and biological materials. Highlyfractionated Zn standards analyzed by DS and standardsample bracketing yield slightly varying results, whichprobably originate from repetitive fractionation eventsduring manufacture of the standards. However, the δ66Znvalues (all reported relative to JMC Lyon Zn) for two lessfractionated in-house Zn standard solutions, Imperial Zn(0.10±0.08‰: 2 SD) and London Zn (0.08±0.04‰), arewithin uncertainties to data reported with different massspectrometric techniques and instruments. Two standardreference materials, blend ore BCR 027 and ryegrass BCR281, were also measured, and the δ66Zn were found to be0.25±0.06‰ (2 SD) and 0.40±0.09‰, respectively. Takentogether, these standard measurements ascertain that thedouble-spike methodology is suitable for accurate andprecise Zn isotope analyses of a wide range of naturalsamples. The newly installed technique was consequentlyapplied to soil samples and soil

Journal article

Wood BJ, Halliday AN, Rehkämper M, 2010, Volatile accretion history of the Earth., Nature, Vol: 467, Pages: E6-E7

It has long been thought that the Earth had a protracted and complex history of volatile accretion and loss. Albarède paints a different picture, proposing that the Earth first formed as a dry planet which, like the Moon, was devoid of volatile constituents. He suggests that the Earth's complement of volatile elements was only established later, by the addition of a small veneer of volatile-rich material at ∼100 Myr (here and elsewhere, ages are relative to the origin of the Solar System). Here we argue that the Earth's mass balance of moderately volatile elements is inconsistent with Albarède's hypothesis but is well explained by the standard model of accretion from partially volatile-depleted material, accompanied by core formation.

Journal article

Baker RGA, Rehkamper M, Ihlenfeld C, Oates CJ, Coggon Ret al., 2010, Thallium isotope variations in an ore-bearing continental igneous setting: Collahuasi Formation, northern Chile, GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 74, Pages: 4405-4416, ISSN: 0016-7037

Journal article

Theis KJ, Schonbachler M, Benedix GK, Rehkaemper M, Andreasen Ret al., 2010, CHRONOLOGY OF IAB IRON METEORITES USING THE Pd-Ag DECAY SYSTEM, 73rd Annual Meeting of the Meteoritical-Society, Publisher: WILEY, Pages: A201-A201, ISSN: 1086-9379

Conference paper

Benedix GK, Hammond SJ, Rehkamper M, Schonbachler M, Andreasen R, Theis K, Rogers NW, Bland PAet al., 2010, TRACE ELEMENT COMPOSITION OF A SULFIDE NODULE IN TOLUCA IAB IRON, 73rd Annual Meeting of the Meteoritical-Society, Publisher: WILEY-BLACKWELL, Pages: A13-A13, ISSN: 1086-9379

Conference paper

Rehkaemper M, Xue Z, Van De Flierdt T, Middag R, De Baar Het al., 2010, Cd isotope constraints on nutrient cycling in the Southern Ocean, Conference on Goldschmidt 2010 - Earth, Energy, and the Environment, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A857-A857, ISSN: 0016-7037

Conference paper

Abouchami W, Rehkaemper M, Galer SJG, Horner TJ, Xue Z, Henderson GM, Wombacher F, Schonbachler M, Gault-Ringold M, Stirling Cet al., 2010, In search of a common reference material for cadmium isotope studies, Conference on Goldschmidt 2010 - Earth, Energy, and the Environment, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A2-A2, ISSN: 0016-7037

Conference paper

Xiao T, Rehkamper M, Yang Z, 2010, Thallium isotope fractionation in the soil-plant interface, Conference on Goldschmidt 2010 - Earth, Energy, and the Environment, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A1155-A1155, ISSN: 0016-7037

Conference paper

Xue Z, Rehkaemper M, van de Flierdt T, Grasse P, Frank Met al., 2010, Cadmium isotope constraints on nutrient cycling in the Peruvian Oxygen Minimum Zone, Conference on Goldschmidt 2010 - Earth, Energy, and the Environment, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A1166-A1166, ISSN: 0016-7037

Conference paper

Horner TJ, Schonbachler M, Rehkamper M, Nielsen SG, Williams H, Halliday AN, Xue Z, Hein JRet al., 2010, Ferromanganese crusts as archives of deep water Cd isotope compositions, GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, Vol: 11

Journal article

Baker RGA, Schonbachler M, Rehkamper M, Williams HM, Halliday ANet al., 2010, The thallium isotope composition of carbonaceous chondrites - New evidence for live <SUP>205</SUP>Pb in the early solar system, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 291, Pages: 39-47, ISSN: 0012-821X

Journal article

Hendry KR, Rickaby REM, de Hoog JCM, Weston K, Rehkamper Met al., 2010, The cadmium-phosphate relationship in brine: biological versus physical control over micronutrients in sea ice environments, ANTARCTIC SCIENCE, Vol: 22, Pages: 11-18, ISSN: 0954-1020

Journal article

Hezel DC, Needham AW, Armytage R, Georg B, Abel RL, Kurahashi E, Coles BJ, Rehkamper M, Russell SSet al., 2010, A nebula setting as the origin for bulk chondrule Fe isotope variations in CV chondrites, Earth and Planetary Science Letters, Vol: 296, Pages: 423-433, ISSN: 0012-821X

We combined micro computer tomography with Fe and Si isotope measurements of Mokoia, Allende and Grosnaja chondrules. Ten Mokoia chondrules contain 0.9 to 11.8 vol.% opaque phases (metal + sulfide), and 6 Allende chondrules contain 0.0 to 6.6 vol.% opaque phases. Hence, the Fe isotope composition of many chondrules is dominated by the Fe isotope composition of their opaque phases. We studied Fe isotopes of 35 bulk chondrules. The range is different for each of the three meteorites studied and largest for Allende with delta Fe-56 ranging from -0.82 to + 0.37%.. Six out of seven chondrules analysed for their Si isotope composition in Mokoia and Grosnaja have similar delta Si-29 of around -0.12%.. One anomalous chondrule in Mokoia has a delta Si-29 of +0.58%. We exclude isotopically heterogeneous chondrule precursors and different isotopic chondrule reservoirs as the source of the observed Fe isotope variation among bulk chondrules. We conclude that the observed bulk chondrule Fe isotope variation is the result of evaporation and re-condensation processes in a nebula setting with high dust densities, required to explain the comparatively low isotope fractionations. Subsequent parent body alteration slightly overprinted this pre-accretionary Fe isotope variation. (C) 2010 Elsevier B.V. All rights reserved.

Journal article

Baker RGA, Rehkaemper M, Hinkley TK, Nielsen SG, Toutain JPet al., 2009, Investigation of thallium fluxes from subaerial volcanism-Implications for the present and past mass balance of thallium in the oceans, GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 73, Pages: 6340-6359, ISSN: 0016-7037

Journal article

Fehr MA, Rehkaemper M, Halliday AN, Hattendorf B, Guenther Det al., 2009, Tellurium isotope compositions of calcium-aluminum-rich inclusions, METEORITICS & PLANETARY SCIENCE, Vol: 44, Pages: 971-984, ISSN: 1086-9379

Journal article

Andreasen R, Schonbachler M, Rehkamper M, 2009, The <SUP>205</SUP>Pb-<SUP>205</SUP>TI and Cd isotope systematics of ordinary chondrites, 19th Annual VM Goldschmidt Conference, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A43-A43, ISSN: 0016-7037

Conference paper

Schonbachler M, Rehkamper M, Williams HM, Halliday ANet al., 2009, The cadmium isotope composition of the Earth, 19th Annual VM Goldschmidt Conference, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A1183-A1183, ISSN: 0016-7037

Conference paper

Xue Z, Rehkamper M, Statham PJ, 2009, A new methodology for precise cadmium isotope analyses of seawater, 19th Annual VM Goldschmidt Conference, Publisher: PERGAMON-ELSEVIER SCIENCE LTD, Pages: A1467-A1467, ISSN: 0016-7037

Conference paper

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