Daly, R. J.

Gilmour, I.

Gilmour, M. A.

Jolley, D. W.

Kelley, S. P.

English

Open Research Online (The Open University)

Open Research OnlineThe Open University’s repository of research publicationsand other research outputsA complete high resolution record of the Dan-C2hyperthermal event in the lacustrine sediments of theBoltysh Impact craterConference or Workshop ItemHow to cite:Gilmour, I.; Jolley, D. W.; Daly, R. J.; Kelley, S. P. and Gilmour, M. A. (2012). A complete high resolutionrecord of the Dan-C2 hyperthermal event in the lacustrine sediments of the Boltysh Impact crater. In: EGU GeneralAssembly 2012, 22-27 Apr 2012, Vienna.For guidance on citations see FAQs.c© 2012 The Author(s)Version: Version of RecordLink(s) to article on publisher’s website:http://meetingorganizer.copernicus.org/EGU2012/EGU2012-7870-2.pdfCopyright and Moral Rights for the articles on this site are retained by the individual authors and/or other copyrightowners. For more information on Open Research Online’s data policy on reuse of materials please consult the policiespage.oro.open.ac.ukGeophysical Research AbstractsVol. 14, EGU2012-7870-2, 2012EGU General Assembly 2012© Author(s) 2012A complete high resolution record of the Dan-C2 hyperthermal event inthe lacustrine sediments of the Boltysh Impact craterI. Gilmour (1), D.W. Jolley (2), R.J. Daly (2), S.P. Kelley (1), and M.A. Gilmour (1)(1) Centre for Earth, Planetary, Space and Astronomical Research, The Open University, Milton Keynes MK7 6AA, UK, (2)Department of Geology & Petroleum Geology, University of Aberdeen, Meston Building, Aberdeen, AB24 3UE, UKDrilling of the 65.17 Ma old, 24 km diameter, Boltysh impact crater in the Ukraine recovered over 400 m ofDanian organic-rich lacustrine sediments [1]. We have undertaken geochemical and palynological investigationsof the newly cored borehole, which demonstrate that these strata contain a unique high resolution record spanning<0.5 Ma of Early Palaeocene terrestrial environmental change. The palynofloras recovered are consistent withterrestrial early Danian successions and geochemical data have highlighted a record that extends through 220m ofcored sediments encompassing the earliest Danian Dan-C2 hyperthermal event first identified by [2]. To date, theDan-C2 hyperthermal event has been identified in marine records, where it is characterised by a pair of negativecarbon isotope excursions (CIEs) of around 1.5h within planktonic foraminiferal zone P1a, post-dating the K/Pgboundary. Geochemical and palynological investigations have enabled us to identify the Dan-C2 event in thelacustrine Boltysh crater fill where it is characterised by a 3-4h negative CIE.In common with other hyperthermal events, it has been suggested that the Dan-C2 reflects transient pertur-bations in the global carbon cycle, however, whether the Dan-C2 is a global event has been disputed. The eventhas been confirmed in the S. Atlantic but was not found in the equatorial Pacific leading to the suggestion that itwas restricted to the Atlantic Ocean [3]. Its presence in the lacustrine sediments of the Boltysh crater fill disprovesthis contention. The Dan-C2 CIE has also been regarded as being of shorter duration and lower magnitude thanthe PETM hyperthermal [2]. This view is brought into question by the Boltysh carbon isotope record, whichhighlights the close comparability of Toarcian, Dan-C2 and PETM excursions. We have also have established theposition of the Dan-C2 with respect to the K/Pg boundary [1] since its close proximity this boundary, also markedby a negative CIE, makes it probable that the event has been misidentified or even amalgamated with the K/Pg inmany sequences.[1] Jolley, D. W. et al. (2010) Geology 38, 835–838. [2] Quillevere, F. et al. (2008) Earth Planet. Sci. Lett.265, 600–615. [3] Westerhold, T. et al. (2011) Paleooceanog. 26, PA2216.

A complete high resolution record of the Dan-C2 hyperthermal event in the lacustrine sediments of the Boltysh Impact crater

http://oro.open.ac.uk/33201/1/EGU2012-7870-2.pdf

A complete high resolution record of the Dan-C2 hyperthermal event in the lacustrine sediments of the Boltysh Impact crater

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