Skip to content

Research at St Andrews

Geology and geochronology of the Tana Basin, Ethiopia: LIP volcanism, super eruptions and Eocene-Oligocene environmental change

Research output: Contribution to journalArticle

Abstract

New geological and geochronological data define four episodes of volcanism for the Lake Tana region in the northern Ethiopian portion of the Afro–Arabian Large Igneous Province (LIP): pre-31 Ma flood basalt that yielded a single 40Ar/39Ar age of 34.05 ± 0.54/0.56 Ma; thick and extensive felsic ignimbrites and rhyolites (minimum volume of 2-3 x 103km3) erupted between 31.108 ± 0.020/0.041 Ma and 30.844 ± 0.027/0.046 Ma (U–Pb CA-ID-TIMS zircon ages); mafic volcanism bracketed by 40Ar/39Ar ages of 28.90 ± 0.12/0.14 Ma and 23.75 ± 0.02/0.04 Ma; and localised scoraceous basalt with an 40Ar/39Ar age of 0.033 ± 0.005/0.005 Ma. The felsic volcanism was the product of super eruptions that created a 60–80 km diameter caldera marked by km-scale caldera-collapse fault blocks and a steep-sided basin filled with a minimum of 180 m of sediment and the present-day Lake Tana. These new data enable mapping, with a finer resolution than previously possible, Afro–Arabian LIP volcanism onto the timeline of the Eocene–Oligocene transition and show that neither the mafic nor silicic volcanism coincides directly with perturbations in the geochemical records that span that transition. Our results reinforce the view that it is not the development of a LIP alone but its rate of effusion that contributes to inducing global-scale environmental change.
Close

Details

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalEarth and Planetary Science Letters
Volume443
Early online date19 Mar 2016
DOIs
Publication statusPublished - 1 Jun 2016

    Research areas

  • LIP, Eocene-Oligocene transition, Lake Tana, Flood basalt, Super eruption

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

View graph of relations

Related by author

  1. A marine origin for the late Mesoproterozoic Copper Harbor and Nonesuch Formations of the Midcontinent Rift of Laurentia

    Jones, S. M., Prave, A. R., Raub, T. D., Cloutier, J., Stüeken, E. E., Rose, C. V., Linnekogel, S. & Nazarov, K., Jan 2020, In : Precambrian Research. 336, 105510.

    Research output: Contribution to journalArticle

  2. Geophysical investigation of the Neolithic Calanais landscape

    Bates, C. R., Bates, M., Gaffney, C., Gaffney, V. & Raub, T. D., 11 Dec 2019, In : Remote Sensing. 11, 24, 2975.

    Research output: Contribution to journalArticle

  3. Proterozoic onset of crustal reworking and collisional tectonics: reappraisal of the zircon oxygen isotope record

    Spencer, C. J., Cawood, P. A., Hawkesworth, C. J., Raub, T. D., Prave, A. R. & Roberts, N. M. W., May 2014, In : Geology. 42, 5, p. 451-454 4 p.

    Research output: Contribution to journalArticle

  4. Anaerobic nitrogen cycling on a Neoarchean ocean margin

    Mettam, C. W., Zerkle, A. L., Claire, M., Prave, A. R., Poulton, S. W. & Junium, C. K., 1 Dec 2019, In : Earth and Planetary Science Letters. 527, 115800.

    Research output: Contribution to journalArticle

Related by journal

  1. An early diagenetic deglacial origin for basal Ediacaran “cap dolostones”

    Ahms, A-S., Maloof, A., Macdonald, F., Hoffman, P., Bjerrum, C., Bold, U., Rose, C. V., Strauss, J. & Higgins, J., 15 Jan 2019, In : Earth and Planetary Science Letters. 506, p. 292-307 16 p.

    Research output: Contribution to journalArticle

  2. Anaerobic nitrogen cycling on a Neoarchean ocean margin

    Mettam, C. W., Zerkle, A. L., Claire, M., Prave, A. R., Poulton, S. W. & Junium, C. K., 1 Dec 2019, In : Earth and Planetary Science Letters. 527, 115800.

    Research output: Contribution to journalArticle

  3. Consequences of glacial cycles for magmatism and carbon transport at mid-ocean ridges

    Cerpa, N. G., Rees Jones, D. W. & Katz, R. F., 15 Dec 2019, In : Earth and Planetary Science Letters. 528, 115845.

    Research output: Contribution to journalArticle

  4. Secular change in TTG compositions: implications for the evolution of Archaean geodynamics

    Johnson, T. E., Kirkland, C. L., Gardiner, N. J., Brown, M., Smithies, R. H. & Santosh, M., 1 Jan 2019, In : Earth and Planetary Science Letters. 505, p. 65-75 11 p.

    Research output: Contribution to journalArticle

  5. Stratospheric eruptions from tropical and extra-tropical volcanoes constrained using high-resolution sulfur isotopes in ice cores

    Burke, A., Moore, K. A., Sigl, M., Nita, D. C., McConnell, J. R. & Adkins, J. F., 1 Sep 2019, In : Earth and Planetary Science Letters. 521, p. 113-119 7 p.

    Research output: Contribution to journalArticle

Related by journal

  1. Earth and Planetary Science Letters (Journal)

    Chris Hawkesworth (Member of editorial board)
    19851993

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

ID: 241567286

Top