Skip to content

Research at St Andrews

Titanium isotopes as a tracer for the plume or island arc affinity of felsic rocks

Research output: Contribution to journalArticle

Author(s)

Zhengbin Deng, Marc Chaussidon, Paul Savage, François Robert, Raphaël Pik, Frédéric Moynier

School/Research organisations

Abstract

Indirect evidence for the presence of a felsic continental crust, such as the elevated 49Ti/47Ti ratios in Archean shales, has been used to argue for ongoing subduction at that time and therefore plate tectonics. However, rocks of intermediate to felsic compositions can be produced in both plume and island arc settings. The fact that Ti behaves differently during magma differentiation in these two geological settings might result in contrasting isotopic signatures. Here, we demonstrate that, at a given SiO2 content, evolved plume rocks (tholeiitic) are more isotopically fractionated in Ti than differentiated island arc rocks (mainly calc-alkaline). We also show that the erosion of crustal rocks from whether plumes (mafic in average) or island arcs (intermediate in average) can all produce sediments having quite constant 49Ti/47Ti ratios being 0.1–0.3 per mille heavier than that of the mantle. This suggests that Ti isotopes are not a direct tracer for the SiO2 contents of crustal rocks. Ti isotopes in crustal sediments are still a potential proxy to identify the geodynamical settings for the formation of the crust but only if combined with additional SiO2 information.
Close

Details

Original languageEnglish
Pages (from-to)1132-1135
JournalProceedings of the National Academy of Sciences of the United States of America
Volume116
Issue number4
Early online date3 Jan 2019
DOIs
Publication statusPublished - 22 Jan 2019

    Research areas

  • Titanium isotopes, Plume, Island arc, Magma differentiation, Plate tectonics

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Experimentally determined Si isotope fractionation between zircon and quartz

    Trail, D., Savage, P. S. & Moynier, F., 2 Jul 2019, In : Geochimica et Cosmochimica Acta. 260, p. 257-274

    Research output: Contribution to journalArticle

  2. Potassium isotope fractionation during magmatic differentiation of basalt to rhyolite

    Tuller-Ross, B., Savage, P. S., Chen, H. & Wang, K., 11 Jul 2019, In : Chemical Geology. In press

    Research output: Contribution to journalArticle

  3. Isotopic fractionation of zirconium during magmatic differentiation and the stable isotope composition of the silicate Earth

    Inglis, E., Moynier, F., Creech, J., Deng, Z., Day, J., Teng, F-Z., Bizzarro, M., Jackson, M. & Savage, P., 1 Apr 2019, In : Geochimica et Cosmochimica Acta. 250, p. 311-323 13 p.

    Research output: Contribution to journalArticle

  4. Origin and significance of Si and O isotope heterogeneities in Phanerozoic, Archean, and Hadean zircon

    Trail, D., Boehnke, P., Savage, P. S., Liu, M-C., Miller, M. & Bindeman, I., 9 Oct 2018, In : Proceedings of the National Academy of Sciences of the United States of America. 115, 41, p. 10287-10292 6 p.

    Research output: Contribution to journalArticle

  5. Copper Isotopes

    Savage, P. S., 28 Jun 2018, Encyclopedia of Geochemistry. White, W. (ed.). Springer

    Research output: Chapter in Book/Report/Conference proceedingEntry for encyclopedia/dictionary

Related by journal

  1. Proceedings of the National Academy of Sciences of the United States of America (Journal)

    Michael Martin Nevels (Guest editor)
    Jul 2016 → …

    Activity: Publication peer-review and editorial work typesEditor of research journal

  2. Proceedings of the National Academy of Sciences of the United States of America (Journal)

    Oscar Eduardo Gaggiotti (Member of editorial board)
    1 Jan 2013 → …

    Activity: Publication peer-review and editorial work typesPeer review of manuscripts

  3. Proceedings of the National Academy of Sciences of the United States of America (Journal)

    Terry K Smith (Member of editorial board)
    2012 → …

    Activity: Publication peer-review and editorial work typesPeer review of manuscripts

  4. Proceedings of the National Academy of Sciences of the United States of America (Journal)

    Terry K Smith (Member of editorial board)
    2008 → …

    Activity: Publication peer-review and editorial work typesPeer review of manuscripts

  5. Proceedings of the National Academy of Sciences of the United States of America (Journal)

    Gareth Brian Miles (Reviewer)
    2006 → …

    Activity: Publication peer-review and editorial work typesPeer review of manuscripts

Related by journal

  1. Acute social isolation alters neurogenomic state in songbird forebrain

    George, J., Bell, Z., Condliffe, D., Doher, K., Abaurrea, T., Spencer, K., Leitao, A., Gahr, M., Hurd, P. & Clayton, D. F., 22 Jul 2019, In : Proceedings of the National Academy of Sciences of the United States of America. Latest Articles

    Research output: Contribution to journalArticle

  2. Asymmetries between achromatic and chromatic extraction of 3D motion signals

    Kaestner, M., Maloney, R., Wailes-Newson, K., Bloj, M., Harris, J., Morland, A. & Wade, A., 17 Jun 2019, In : Proceedings of the National Academy of Sciences of the United States of America. Latest Articles, 10 p.

    Research output: Contribution to journalArticle

  3. Limited oxygen production in the Mesoarchean ocean

    Ossa Ossa, F., Hofmann, A., Spangenberg, J. E., Poulton, S. W., Stüeken, E. E., Schoenberg, R., Eickmann, B., Wille, M., Butler, M. & Bekker, A., 2 Apr 2019, In : Proceedings of the National Academy of Sciences of the United States of America. 116, 14, p. 6647-6652 6 p.

    Research output: Contribution to journalArticle

ID: 257274194