Professor Mark Rehkämper

Münker C, Weyer S, Mezger K, Rehkämper M, Wombacher F, Bischoff Aet al., 2000, <SUP>92</SUP>Nb-<SUP>92</SUP>Zr and the early differentiation history of planetary bodies, SCIENCE, Vol: 289, Pages: 1538-1542, ISSN: 0036-8075

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• Citations: 53

Yi W, Halliday AN, Alt JC, Lee DC, Rehkamper M, Garcia MO, Su YJet al., 2000, Cadmium, indium, tin, tellurium, and sulfur in oceanic basalts: Implications for chalcophile element fractionation in the Earth, JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, Vol: 105, Pages: 18927-18948, ISSN: 2169-9313

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• Citations: 120

Rehkämper M, Mezger K, 2000, Investigation of matrix effects for Pb isotope ratio measurements by multiple collector ICP-MS:: verification and application of optimized analytical protocols, JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, Vol: 15, Pages: 1451-1460, ISSN: 0267-9477

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• Citations: 160

Halliday AN, Christensen JN, Lee D-C, Rehkamper M, Hall CM, Luo Xet al., 2000, Multiple collector ICP-MS, Inorganic Mass Spectrometry, Editors: Barshik, Duckworth, Smith DH, New York, Publisher: Marcel Dekker, Pages: 291-328

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Burton KW, Schiano P, Birck JL, Allegre CJ, Rehkamper M, Halliday ANet al., 1999, The distribution and behaviour of Re and Os amongst mantle minerals and the consequences of metasomatism and melting on mantle lithologies, ISSN: 0391-2612

The fractionation of Re and Os during basalt genesis is one of the key processes governing the present-day distribution of these elements between the earth's crust and mantle. However, the cause of this fractionation remains poorly understood, in a large part because there is little information on the distribution and behaviour of Re and Os in mantle minerals. This study presents rhenium-osmium (Re-Os) isotope and elemental abundances for primary mantle minerals, metasomatic phases, and a range of mantle rock types from xenoliths in recent voclanics in northern Tanzania. These results provide quantitative constraints on the distribution of Re and Os amongst mantle minerals, enable an assessment of the effects of metasomatism, and an understanding of the behaviour of Re and Os during melting and the consequences for the chemistry of the mantle residue. Re and Os abundances for sulphide and coexisiting silicates in garnet lherzolites from Lashaine confirm that sulphide dominates the Os budget (e.g. Hart and Ravizza, 1996), but also show that Re is almost exclusively sited in silicate phases. Silicate minerals from two different samples yield 187Re-188Os ages of 32±12 and 15±8 Myr, respectively. Comparison with 147Sm-143Nd, 87Rb-87Sr, and 232Th-208Pb ages for the same silicate minerals suggests differential closure between these isotopes systems, and a closure temperature of about 700°C for the Re-Os system. However, sulphide inclusions preserve significantly less radiogenic Os isotope compositions, suggesting that they have been shielded from reaction or diffusion by their silicate hosts. Diffusion rates in sulphides are likely to be rapid at mantle temperatures (e.g. Birchenall, 1974), however, for sulphide inclusions diffusion through the silicate host is likely to be impaired by the high partition coefficient between sulphide and silicate pahses (Hofmann and Hart, 1978). The Os isotope composition of the sulphide (187Os/188Os = 0.10432±13)

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Rehkämper M, Halliday AN, Fitton JG, Lee DC, Wieneke M, Arndt NTet al., 1999, Ir, Ru, Pt, and Pd in basalts and komatiites:: New constraints for the geochemical behavior of the platinum-group elements in the mantle, GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 63, Pages: 3915-3934, ISSN: 0016-7037

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• Citations: 261

Rehkämper M, Halliday AN, Alt J, Fitton JG, Zipfel J, Takazawa Eet al., 1999, Non-chondritic platinum-group element ratios in oceanic mantle lithosphere:: petrogenetic signature of melt percolation?, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 172, Pages: 65-81, ISSN: 0012-821X

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• Citations: 134

Rehkämper M, Halliday AN, 1999, The precise measurement of T1 isotopic compositions by MC-ICPMS:: Application to the analysis of geological materials and meteorites, GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 63, Pages: 935-944, ISSN: 0016-7037

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• Citations: 121

Rehkämper M, Halliday AN, 1998, Accuracy and long-term reproducibility of lead isotopic measurements by multiple-collector inductively coupled plasma mass spectrometry using an external method for correction of mass discrimination, INTERNATIONAL JOURNAL OF MASS SPECTROMETRY, Vol: 181, Pages: 123-133, ISSN: 1387-3806

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• Citations: 144

Yi W, Halliday AN, Lee DC, Rehkämper Met al., 1998, Precise determination of cadmium, indium and tellurium using multiple collector ICP-MS, GEOSTANDARDS NEWSLETTER-THE JOURNAL OF GEOSTANDARDS AND GEOANALYSIS, Vol: 22, Pages: 173-179, ISSN: 0150-5505

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• Citations: 40

Rehkamper M, Halliday AN, Wentz RF, 1998, Low-blank digestion of geological samples for platinum-group element analysis using a modified Carius Tube design, FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY, Vol: 361, Pages: 217-219, ISSN: 0937-0633

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• Citations: 28

Halliday AN, Lee DC, Christensen JN, Rehkamper M, Yi W, Luo XZ, Hall CM, Ballentine CJ, Pettke T, Stirling Cet al., 1998, Applications of multiple collector-ICPMS to cosmochemistry, geochemistry, and paleoceanography, GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 62, Pages: 919-940, ISSN: 0016-7037

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• Citations: 229

Halliday AN, Christensen JN, Lee D-C, Hall CM, Ballentine CJ, Rehkamper M, Yi W, Luo X, Barford Det al., 1998, ICP multiple-collector mass spectrometry and in-situ high precision isotopic analysis, Application of microanalytical techniques to understanding mineralization processes, Editors: McKibben, Shanks, Ridley WI, Publisher: Society of Economic Geologists, Pages: 37-51

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Luo XZ, Rehkamper M, Lee DC, Halliday ANet al., 1997, High precision <SUP>230</SUP>Th/<SUP>232</SUP>Th and <SUP>234</SUP>U/<SUP>238</SUP>U measurements using energy-filtered ICP magnetic sector multiple collector mass spectrometry, INTERNATIONAL JOURNAL OF MASS SPECTROMETRY, Vol: 171, Pages: 105-117, ISSN: 1387-3806

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• Citations: 171

Rehkamper M, Halliday AN, Barfod D, Fitton JGet al., 1997, Platinum-group element abundance patterns in different mantle environments, SCIENCE, Vol: 278, Pages: 1595-1598, ISSN: 0036-8075

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• Citations: 111

Rehkamper M, Halliday AN, 1997, Development and application of new ion-exchange techniques for the separation of the platinum group and other siderophile elements from geological samples, TALANTA, Vol: 44, Pages: 663-672, ISSN: 0039-9140

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• Citations: 136

Rehkamper M, Hofmann AW, 1997, Recycled ocean crust and sediment in Indian Ocean MORB, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 147, Pages: 93-106, ISSN: 0012-821X

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• Citations: 372

Rehkamper M, Gartner M, Galer SJG, Goldstein SLet al., 1996, Separation of Ce from other rare-earth elements with application to Sm-Nd and La-Ce chronometry, CHEMICAL GEOLOGY, Vol: 129, Pages: 201-208, ISSN: 0009-2541

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• Citations: 47

Halliday A, Rehkamper M, Lee DC, Yi Wet al., 1996, Early evolution of the Earth and Moon: New constraints from Hf-W isotope geochemistry, EARTH AND PLANETARY SCIENCE LETTERS, Vol: 142, Pages: 75-89, ISSN: 0012-821X

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• Citations: 91

REHKAMPER M, 1995, A HIGHLY SENSITIVE HPLC METHOD FOR THE DETERMINATION OF TH AND U CONCENTRATIONS IN GEOLOGICAL SAMPLES, CHEMICAL GEOLOGY, Vol: 119, Pages: 1-12, ISSN: 0009-2541

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• Citations: 13

PATCHETT PJ, LEHNERT K, REHKAMPER M, SIEBER Get al., 1994, MANTLE AND CRUSTAL EFFECTS ON THE GEOCHEMISTRY OF PROTEROZOIC DIKES AND SILLS IN SWEDEN, JOURNAL OF PETROLOGY, Vol: 35, Pages: 1095-1125, ISSN: 0022-3530

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• Citations: 43

JOCHUM KP, REHKAMPER M, SEUFERT HM, 1994, TRACE-ELEMENT ANALYSIS OF BASALT BIR-1 BY ID-SSMS, HPLC AND LIMS, GEOSTANDARDS NEWSLETTER, Vol: 18, Pages: 43-51, ISSN: 0150-5505

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• Citations: 46

REHKAMPER M, 1994, A NEW LOW-LEVEL HPLC TECHNIQUE FOR QUANTITATIVE-DETERMINATION OF NIOBIUM IN ROCKS, CHEMICAL GEOLOGY, Vol: 113, Pages: 61-69, ISSN: 0009-2541

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• Citations: 12