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Träfflista för sökning "WFRF:(Cockell Charles) ;pers:(Vajda Vivi)"

Sökning: WFRF:(Cockell Charles) > Vajda Vivi

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1.
  • Schaefer, Bettina, et al. (författare)
  • Microbial life in the nascent Chicxulub crater
  • 2020
  • Ingår i: Geology. - Boulder : Geological Society of America. - 0091-7613 .- 1943-2682. ; 48, s. 328-332
  • Tidskriftsartikel (refereegranskat)abstract
    • The Chicxulub crater was formed by an asteroid impact at ca. 66 Ma. The impact is considered to have contributed to the end-Cretaceous mass extinction and reduced productivity in the world’s oceans due to a transient cessation of photosynthesis. Here, biomarker profiles extracted from crater core material reveal exceptional insights into the post-impact upheaval and rapid recovery of microbial life. In the immediate hours to days after the impact, ocean resurge flooded the crater and a subsequent tsunami delivered debris from the surrounding carbonate ramp. Deposited material, including biomarkers diagnostic for land plants, cyanobacteria, and photosynthetic sulfur bacteria, appears to have been mobilized by wave energy from coastal microbial mats. As that energy subsided, days to months later, blooms of unicellular cyanobacteria were fueled by terrigenous nutrients. Approximately 200 k.y. later, the nutrient supply waned and the basin returned to oligotrophic conditions, as evident from N2-fixing cyanobacteria biomarkers. At 1 m.y. after impact, the abundance of photosynthetic sulfur bacteria supported the development of water-column photic zone euxinia within the crater.
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2.
  • Schulte, Peter, et al. (författare)
  • Cretaceous Extinctions: Evidence Overlooked Response
  • 2010
  • Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 1095-9203 .- 0036-8075. ; 328:5981, s. 975-976
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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3.
  • Schulte, Peter, et al. (författare)
  • The Chicxulub Asteroid Impact and Mass Extinction at the Cretaceous-Paleogene Boundary
  • 2010
  • Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 1095-9203 .- 0036-8075. ; 327:5970, s. 1214-1218
  • Tidskriftsartikel (refereegranskat)abstract
    • The Cretaceous-Paleogene boundary similar to 65.5 million years ago marks one of the three largest mass extinctions in the past 500 million years. The extinction event coincided with a large asteroid impact at Chicxulub, Mexico, and occurred within the time of Deccan flood basalt volcanism in India. Here, we synthesize records of the global stratigraphy across this boundary to assess the proposed causes of the mass extinction. Notably, a single ejecta-rich deposit compositionally linked to the Chicxulub impact is globally distributed at the Cretaceous-Paleogene boundary. The temporal match between the ejecta layer and the onset of the extinctions and the agreement of ecological patterns in the fossil record with modeled environmental perturbations (for example, darkness and cooling) lead us to conclude that the Chicxulub impact triggered the mass extinction.
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  • Resultat 1-3 av 3

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