U/Pb dating of zircons from the lower crustal xenoliths from Siberian kimberlites

V. G. Malkovets, E. A. Belousova, W. L. Griffin, L. V. Buzlukova, Vladislav S. Shatsky, S. Y. O'Reilly, N. P. Pokhilenko

    Research output: Contribution to journalMeeting abstractpeer-review

    Abstract

    Zircons from seven lower crustal xenoliths from Siberian
    kinberlites have been dated in situ by U/Pb LAM-ICP-MS at
    the GEMOC National Key Centre, Macquarie University,
    Australia. The suite of studied samples comprises two
    granulites from the Udachnaya pipe and one granulite from the
    Leningradskaya pipe, (Daldyn kimberlite field), one granulite
    from the Yubileinaya pipe and three shists from the
    Komsomol’skaya pipe, (Alakit field).
    Thirty eight zircon grains were extracted and analyzed
    from the granulite xenolith Ud-01-44 (Udachnaya). Most of
    the zircons give 207Pb/206Pb ages of 1.89 Ga and two grains
    give 2.5 Ga. Only four zircons have been found in the
    granulite xenolith Ud-01-66 (Udachnaya). They give a
    207Pb/206Pb age of 1.79 Ga. Twenty zircon grains from
    granulite xenolith L-02-9 from the Leningradskaya pipe give a
    207Pb/206Pb age of 1.9 Ga.
    Six zircon grains from the granulite xenolith Yb-02-27
    (Yubileinaya pipe) give a 207Pb/206Pb age of 1.86 Ga. Twelve
    zircon grains from the shist xenolith K-3-02
    (Komsomol’skaya) give a 207Pb/206Pb age of 1.89 Ga.
    Seventeen zircon grains from the shist xenolith K-69-02
    (Komsomol’skaya) give a 207Pb/206Pb age of 1.9 Ga. Three
    other grains give 2.9, 2.4, and 2.3 Ga. Nineteen zircon grains
    from the shist xenolith K-45-02 from the Komsomol’skaya
    pipe give a 207Pb/206Pb age of 1.84 Ga. Two grains give 2.3 Ga
    and one grain give 2.46 Ga.
    Xenoliths of granulites and shists from the Paleozoic
    kimberlites provide the timing of major periods of lower crust
    formation in the Siberian craton in Archean and Proterozoic
    time. The Paleoproterozoic ages around 1.8-1.9 Ga correspond
    to a period of crustal reworking, and the collision between
    separate blocks of the craton, during the final assembly of the
    Siberian craton [1,2].

    [1] Rosen et al. (1994) In: Condie, K.C. (ed.), Archean Crustal
    Evolution, 411-459.
    [2] Smelov and Timofeev (2007) Gond.
    Research 12, 279-288.
    Original languageEnglish
    Pages (from-to)A823-A823
    Number of pages1
    JournalGeochimica et Cosmochimica Acta
    Volume73
    Issue number13 supplement
    Publication statusPublished - Jun 2009
    EventGoldschmidt Conference (19th : 2009) - Davos, Switzerland
    Duration: 21 Jun 200926 Jun 2009

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