Triggering of the largest Deccan eruptions by the Chicxulub impact

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Richards, M.A. ; Alvarez, W. ; Self, S. ; Karlstrom, L. ; Renne, P.R. ; Manga, M. ; Sprain, C.J. ; Smit, J. ; Vanderkluysen, L. ; Gibson, S.A. (2015)

New constraints on the timing of the Cretaceous- Paleogene mass extinction and the Chicxulub impact, together with a particularly voluminous and apparently brief eruptive pulse toward the end of the "main-stage" eruptions of the Deccan continental flood basalt province suggest that these three events may have occurred within less than about a hundred thousand years of each other. Partial melting induced by the Chicxulub event does not provide an energetically plausible explanation for this coincidence, and both geochronologic and magnetic-polarity data show that Deccan volcanism was under way well before Chicxulub/Cretaceous-Paleogene time. However, historical data document that eruptions from existing volcanic systems can be triggered by earthquakes. Seismic modeling of the ground motion due to the Chicxulub impact suggests that the impact could have generated seismic energy densities of order 0.1-1.0 J/m3 throughout the upper ~200 km of Earth's mantle, sufficient to trigger volcanic eruptions worldwide based upon comparison with historical examples. Triggering may have been caused by a transient increase in the effective permeability of the existing deep magmatic system beneath the Deccan province, or mantle plume "head." It is therefore reasonable to hypothesize that the Chicxulub impact might have triggered the enormous Poladpur, Ambenali, and Mahabaleshwar (Wai Subgroup) lava flows, which together may account for >70% of the Deccan Traps main-stage eruptions. This hypothesis is consistent with independent stratigraphic, geochronologic, geochemical, and tectonic constraints, which combine to indicate that at approximately Chicxulub/Cretaceous- Paleogene time, a huge pulse of mantle plume-derived magma passed through the crust with little interaction and erupted to form the most extensive and voluminous lava flows known on Earth. High-precision radioisotopic dating of the main-phase Deccan flood basalt formations may be able either to confirm or reject this hypothesis, which inturn might help to determine whether this singular outburst within the Deccan Traps (and possibly volcanic eruptions worldwide) contributed significantly to the Cretaceous-Paleogene extinction.
  • References (104)
    104 references, page 1 of 11

    Alvarez, W., 2003, Comparing the evidence relevant to impact and flood basalt at times of major mass extinctions: Astrobiology, v. 3, p. 153-161, doi:10.1089 /153110703321632480.

    Alvarez, L.W., Alvarez, W., Asaro, F., and Michel, H.V., 1980, Extraterrestrial cause for the Cretaceous-Tertiary extinction: Science, v. 208, p. 1095-1108, doi:10.1126 /science.208.4448.1095.

    Bajpai, S., and Prasae, G.V.R., 2000, Cretaceous age for Ir-rich Deccan intertrappean deposits: Palaeontological evidence from Anjar, western India: Journal of the Geological Society of London, v. 157, p. 257-260, doi: 10.1144/jgs.157.2.257.

    Baksi, A.J., Byerly, G.R., Chan, L.-H., and Farrar, E., 1994, Intracanyon flows in the Deccan province, India? Case history of the Rajamundry Traps: Geology, v. 22, p. 605-608.

    Barrera, E., and Savin, S.M., 1999, Evolution of late Campanian-Maastrichtian climates and oceans, in Barrera, E., and Johnson, C.C., eds., Evolution of the Cretaceous Ocean-Climate System: Geological Society of America Special Paper 332, p. 245-282, doi:10.1130/0-8137-2332 -9.245.

    Basu, A.R., Renne, P.R., DasGupta, D., Teichmann, F., and Poreda, R.J., 1993, Early and late alkali igneous pulses and a high-3He origin for the Deccan flood basalts: Science, v. 261, p. 902-906, doi:10.1126/science.261 .5123.902.

    Beane, J.E., Turner, C.A., Hooper, P.R., Subbarao, K.V., and Walsh, J.N., 1986, Stratigraphy, composition and form of the Deccan basalts, Western Ghats, India: Bulletin of Volcanology, v. 48, p. 61-83, doi:10.1007 /BF01073513.

    Beresnev, I.A., Gaul, W., and Vigil, R.D., 2011, Direct pore-level observation of permeability increase in twophase flow by shaking: Geophysical Research Letters, v. 38, L20302, doi:10.1029/2011GL048840.

    Black, B.A., Lamarque, J.-F., Shields, C.A., Elkins-Tanton, L.T., and Kiehl, J.T., 2014, Acid rain and ozone depletion from pulsed Siberian Traps magmatism: Geology, v. 42, p. 67-70, doi:10.1130/G34875.1.

    Boslough, M.B., Chael, E.P., Trucano, T.G., Crawford, D.A., and Campbell, D.L., 1996, Axial focusing of impact energy in the Earth's interior: A possible link to flood basalts and hotspots, in Ryder, G., Fastovsky, D.E., and Gartner, S., eds., The Cretaceous-Tertiary Event and Other Catastrophes in Earth History: Geological Society of America Special Paper 307, p. 817-840.

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