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Research interests My research centres on the mineral diamond; in particular the syngenetic mineral inclusion content and the physical and chemical characteristics of the host. When the geochemistry of the inclusions is combined with the physical characteristics of the diamond, detailed information is obtained about the different environments of diamond formation in both the upper and, more recently, the lower mantle. From inclusions, both the genesis and eruption ages of diamond can be determined. Sulphide inclusions specifically, can tell us about the early Earth atmosphere, (see Publication list). Crustal and mantle processes are linked through the possible involvement of crustal carbon and nitrogen in subduction mechanisms leading to the possible formation of eclogitic diamonds at depth. In this regard, the isotopic signatures of such diamonds are assessed against crustal values. Recent publications | View all publications >> Thomassot, E., Cartigny, P., Viljoen, K.S and Harris, J. W. 2007. Methane-related diamond crystallization in the Earth’s mantle. Earth and Planet Sci Lett, 257, 362-371. . Tappert, R., Stachel, T., Harris, J.W., Muehlenbachs, K and Brey, G.P. 2006. Placer diamonds from Brazil: Indicators of the composition of the Earth’s mantle and of the origin of their kimberlitic source. Economic Geology. 101, 453-470. Tomlinson, E., Jones, A.P. and Harris, J.W. 2006. Co-existing fluid and silicate inclusions in mantle diamond. Earth and Planetary Science Letters 250, 581-595. Westerland, K.J., Shirey, S.B., Richardson, S.H., Carlson, R.W., Gurney, J.J. and Harris, J.W. 2006. A subduction-related origin for mid-Archean diamonds and harzburgites from the Panda kimberlite, Slave craton: Implications from Re-Os isotope systematics. Contrib. Min. Pet. 152, 275-294. Brenker, F.E., Vincze, L., Vekemans, B., Nasdala, L., Stachel, T., Vollmer, C., Kersten, M., somogyi, A., Adams, F., Joswig, W and Harris, J.W. 2005. Detection of a Ca-rich Lithology in the Earth’s deep (>300km) convecting mantle. Earth and Planet Sci Lett, 236, 579-587. Gautheron, C., Cartigny, P., Moriera, M., Harris, J.W. and Allegre, C. 2005. Are Polycrystalline diamonds appropriate objects to constrain the rare gas past signature of the Earth mantle? Earth and Planet Sci Lett, 240, 559-572. Kellie, J.D., Clive, P.J.M., Yang, G. L., Gordon, C., Hall, C., Harris, J.W., Jones, R.T., Livingston, K., Macgregor, I.J.D., McGeorge, C., Melone, J., Owens, R.O., Slaven, P.A., Vrcelj, R. and Watts, D. 2005. The Selection of and Performance of Diamond Radiators used in Coherant Bremsstrahlung Experiments. Nucl. Inst.and Methods in Physics Research. A 545 164-180. Nasdala, L., Hofmeister, W., Harris, J.W. and Glinneman, J. 2005. Growth zoning and strain patterns inside diamond crystals as revealed by Raman maps. Amer. Min., 90, 745-748. Stachel, T., Brey, G.P and Harris, J.W. 2005. Inclusions in Sublithospheric Diamonds; Glimpses of Deep Earth. Elements. 1, 73-78. Tappert, R., Stachel, T., Harris, J.W. and Brey, G.P. 2005. Mineral inclusions in diamonds from the Panda Kimberlite, Slave Province, Canada. Eur. J. Min., 17, 423-440. |
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