Daly, R.

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 outputsThe Boltysh crater record of rapid vegetation changeduring the Dan-C2 hyperthermal eventConference or Workshop ItemHow to cite:Jolley, D.W.; Daly, R.; Gilmour, I; Gilmour, M. A. and Kelley, S. P. (2012). The Boltysh crater record of rapidvegetation change during the Dan-C2 hyperthermal event. In: EGU General Assembly 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://www.egu2012.eu/EGU2012-programmegroup programme SSP.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, EGU2012-4635, 2012EGU General Assembly 2012© Author(s) 2012The Boltysh crater record of rapid vegetation change during the Dan-C2hyperthermal event.D.W. Jolley (1), R Daly (1), I Gilmour (2), M Gilmour (2), and S.P. Kelley (2)(1) University of Aberdeen, Geology & Petroleum Geology, Aberdeen, United Kingdom (d.jolley@abdn.ac.uk), (2)Department of Physical Sciences, Open University, Milton Keynes MK7 6AA UK.Analysis of a cored borehole drilled through the sedimentary fill of the 24km wide Boltysh meteorite crater,Ukraine has yielded a unique, high resolution record spanning <1my of Early Paleocene terrestrial environmentalchange. While the oldest crater fill sediments preserve a record of the K/Pg boundary, overlying sedimentspreserve a record through the earliest Danian Dan-C2 hyperthermal event. This event is preserved in ⇠220mof lacustrine organic mudrocks and shows close similarities to the carbon isotope records of the Toarcian andPETM CIE’s. At Boltysh, the rapid sedimentation rate and lack of bioturbation in the crater fill lacustrine depositspreserve uniquely high resolution pollen, spore and algae records. These records reflect environmental changefrom the K/Pg1 to the post Dan-C2 Danian. Leading into the CIE, warm temperate gymnosperm – angiosperm –fern communities are replaced by precipitation limited (winterwet) plant communities within the negative CIE.Winterwet plant communities dominate the negative CIE, but are replaced within the isotope recovery stage bywarm temperate floras. These in turn give way to cooler temperate floras in the post positive CIE section of theuppermost crater fill.The distribution of temperate taxa about the negative CIE represents the broadest scale of oscillatory variationin the palynofloras. Shorter frequency oscillations are evident from diversity and botanical group distributionsreflecting changes in moisture availability over several thousand years. Detailed analysis of variability within oneof these oscillations records plant community cyclicity across the inception of the negative CIE. This short termcyclicity provides evidence that the replacement of warm termperate by winterwet floras occurred in a stepwisemanner at the negative CIE suggesting cumulative atmospheric forcing. At <1mm scale, lamination within thenegative CIE showed no obvious lithological or colour differences, and are not seasonal couplets. However,palynofloral analysis of laminations from within the negative CIE has yielded evidence of annual variationidentifying the potential for recoding changes in ‘paleoweather’ across a major hyperthermal event.[1] Jolley, D. W. et al. (2010) Geology 38, 835–838.

The Boltysh crater record of rapid vegetation change during the Dan-C2 hyperthermal event

http://oro.open.ac.uk/33203/1/EGU2012-4635.pdf

The Boltysh crater record of rapid vegetation change during the Dan-C2 hyperthermal event

Abstract

Similar works

Full text

Available Versions

Open Research Online (The Open University)