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Biomass preservation in impact melt ejecta


Meteorites can have played a role in the delivery of the building blocks of life to Earth only if organic compounds are able to survive the high pressures and temperatures of an impact event. Although experimental impact studies have reported the survival of organic compounds1,2,3,4,5,6, there are uncertainties in scaling experimental conditions to those of a meteorite impact on Earth1,2,3,4,5,6 and organic matter has not been found in highly shocked impact materials in a natural setting. Impact glass linked to the 1.2-km-diameter Darwin crater in western Tasmania7,8,9 is strewn over an area exceeding 400 km2 and is thought to have been ejected by a meteorite impact about 800 kyr ago into terrain consisting of rainforest and swamp7,10. Here we use pyrolysis–gas chromatography–mass spectrometry to show that biomarkers representative of plant species in the local ecosystem—including cellulose, lignin, aliphatic biopolymer and protein remnants—survived the Darwin impact. We find that inside the impact glass the organic components are trapped in porous carbon spheres. We propose that the organic material was captured within impact melt and preserved when the melt quenched to glass, preventing organic decomposition since the impact. We suggest that organic material can survive capture and transport in products of extreme impact processing, at least for a Darwin-sized impact event.

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Figure 1: Scanning electron microscopy (SEM) image of a carbonaceous inclusion from Darwin glass.
Figure 2: SEM microcommuted tomography images.
Figure 3: Total ion chromatogram.


  1. Peterson, E., Horz, F. & Chang, S. Modification of amino acids at shock pressures of 3.5 to 32 GPa. Geochim. Cosmochim. Acta 61, 3937–3950 (1997).

    Article  Google Scholar 

  2. Parnell, J. et al. The preservation of fossil biomarkers during impact: Experimental evidence from biomarker rich projectiles and target rocks. Meteorol. Planet. Sci. 45, 1340–1358 (2010).

    Article  Google Scholar 

  3. Bowden, S. A. et al. The thermal alteration by pyrolysis of the organic component of small projectiles of mudrock during capture at hypervelocity. J. Anal. Appl. Pyrol. 82, 312–314 (2008).

    Article  Google Scholar 

  4. Bowden, S. A. et al. Survival of organic compounds in ejecta from hypervelocity impacts on ice. Astrobiology 8, 19–25 (2009).

    Article  Google Scholar 

  5. Fajardo-Cavazos, P. et al. Bacterial spores in granite survive hypervelocity launch by spallation: Implications for lithopanspermia. Astrobiology 97, 647–657 (2009).

    Article  Google Scholar 

  6. Parnell, J. et al. Organic geochemistry of impactites from the Haughton impact structure, Devon Island, Nunavut, Canada. Geochim. Cosmochim. Acta 71, 1800–1819 (2007).

    Article  Google Scholar 

  7. Howard, K. T. Physical distribution trends in Darwin glass. Meteorol. Planet. Sci. 44, 115–129 (2009).

    Article  Google Scholar 

  8. Howard, K. T. Geochemistry of Darwin glass and target rocks from Darwin Crater, Tasmania, Australia. Meteorol. Planet. Sci. 43, 473–496 (2008).

    Article  Google Scholar 

  9. Howard, K. T. & Haines, P. W. Geology of Darwin Crater. Earth Planet. Sci. Lett. 260, 328–339 (2007).

    Article  Google Scholar 

  10. Loh, C. H et al. Laser fusion argon-40/argon-39 ages of Darwin Impact glass. Meteorol. Planet. Sci. 37, 1555–1562.

    Article  Google Scholar 

  11. Melosh, H. J. The rocky road to panspermia. Nature 332, 687–688 (1988).

    Article  Google Scholar 

  12. Melosh, H. J. Impact Cratering A Geologic Process (Oxford Univ. Press, 1989).

    Google Scholar 

  13. Koeberl, C. Geochemistry of tektites and impact glasses. Annu. Rev. Earth Planet. Sci. 14, 323–350 (1986).

    Article  Google Scholar 

  14. Anders, E. Pre-biotic organic matter from comets and asteroids. Nature 342, 255–257 (1989).

    Article  Google Scholar 

  15. Jenniskens, P. et al. Meteors: A delivery mechanism of organic matter to the early earth. Earth Moon Planets 82–83, 57–70 (2000).

    Google Scholar 

  16. Parnell, J. et al. Preservation of organic matter in the STONE 6 artificial meteorite experiment. Icarus 212, 390–402 (2011).

    Article  Google Scholar 

  17. French, B. M. Traces of catastrophe a handbook of shock-metamorphic effects in terrestrial meteorite impact structures. LPI Contribution No 954 (Lunar and Planetary Institute, 1998).

  18. Zak, K., Skala, R., Randa, A. & Mizera, J. A review of volatile compounds in tektites, and carbon content and isotopic composition of moldavite tektites. Meteorol. Planet. Sci. 47, 1010–1028 (2012).

    Article  Google Scholar 

  19. Howard, K. T. Volatile enhanced dispersal of high-velocity impact melt and the origin of tektites. Proc. Geol. Assoc. 122, 363–382 (2011).

    Article  Google Scholar 

  20. Artemieva, N. Tektites: model versus reality. LPS 39 abstract#1526 (2008).

  21. Bailey, M. J, Howard, K. T., Kirkby, K. J. & Jeynes, C. Characterisation of inhomogeneous inclusions in Darwin glass using ion beam analysis. Nucl. Instrum. Methods B 267, 2219–2214 (2009).

    Article  Google Scholar 

  22. Ralph, J. & Hatfield, R. D. Pyrolysis-GC-MS characterization of forage materials. J. Agricul. Food Chem. 39, 1426–1437 (1991).

    Article  Google Scholar 

  23. Koeberl, C., Poag, C. W., Reimold, W. U. & Brandt, D. Impact origin of the Chesapeake Bay structure and the source of the North American tektites. Science 271, 1263–1266 (1996).

    Article  Google Scholar 

  24. Stoffler, D., Artemieva, N. A. & Pierazzo, E. Modelling the Ries-Steinham impact event and the formation of the Moldavite Strewn Field. Meteorol. Planet. Sci. 37, 1893–1970 (2002).

    Article  Google Scholar 

  25. Bland, P. The impact rate on Earth. Phil. Trans. R. Soc. 363, 2793–2810 (2005).

    Article  Google Scholar 

  26. Armstrong, J. C., Wells, L. E. & Gonzalez, G. Rummaging through Earth’s attic for remains of ancient life. Icarus 160, 183–196 (2002).

    Article  Google Scholar 

  27. Mileikowsky, C. et al. Natural transfer of viable microbes in space. Icarus 145, 391–427 (2000).

    Article  Google Scholar 

  28. Gladman, B. et al. Impact seeding and reseeding in the inner Solar System. Astrobiology 5, 483–496 (2005).

    Article  Google Scholar 

  29. Bland, P. A. & Smith, T. B. Meteorite accumulations on Mars. Icarus 144, 21–26 (2000).

    Article  Google Scholar 

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This work was supported by STFC through the UK Cosmochemistry Analysis Network (UK-CAN) at The Natural History Museum. The Engineering and Physical Sciences Research Council (EPSRC) provided access to beam time at Surrey Ion Beam Centre. Z.M. acknowledges financial support by the Royal Society. Sample collection was supported by: University of Tasmania, Department of Primary Industry Water and Environment (Tas.) and Barringer Crater Company. Tasmanian Aboriginals are the traditional owners of Darwin glass and Darwin crater.

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Authors and Affiliations



K.T.H. discovered the inclusions, planned the project and wrote the manuscript with P.A.B., who also helped interpret data. M.J.B. and C.J. collected and interpreted ion beam data. R.M., Z.M. and M.S. collected and interpreted organic matter data. D.B. and V.S. carried out TEM analyses. L.E.H. collected XuM images. S.V. collected and interpreted carbon isotope data. G.C. carried out XRD analyses and helped interpret data.

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Correspondence to Kieren Torres Howard.

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The authors declare no competing financial interests.

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Howard, K., Bailey, M., Berhanu, D. et al. Biomass preservation in impact melt ejecta. Nature Geosci 6, 1018–1022 (2013).

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