georefid:2003-060391SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2003-060391<gco:CharacterString>Review of the mineralogy of the Cretaceous-Tertiary boundary clay; evidence supporting a major extraterrestrial catastrophic event</gco:CharacterString>2002-01-01publicationgeorefid:2003-060391Ortega-Huertas, M.Universidad de Granada, Departamento de Mineralogia y Petrologia, Granada, SpainauthorMartinez-Ruiz, F.Universite de Lille, FranceauthorPalomo, I.authorChamley, H.authorMineralogical Society, London, United KingdompublisherdocumentHardcopyClay Minerals37 (3)395-411The proposed impact event at the end of the Cretaceous resulted in mass extinctions and subsequently significant variations in the geochemical and mineralogical composition of the sediments marking the K/T boundary. The impact-generated material derived from target rocks produced the ejecta layer deposits around Chicxulub crater, which were subsequently diagenetically altered to mainly smectite in marine sections and to kaolinite in continental sections. The fireball layer represents the cosmic dust dispersed and deposited globally and contains smectite derived from the alteration of microkrystites and the finest fraction. The lowermost Danian clay layer, recognized in marine sections, resulted from the sudden decrease in ocean productivity and represents a reduced sedimentation deposit. Its clay mineral associations depend on local environmental conditions and diagenetic processes. Overall, the diagenetic alteration of the boundary materials resulted in a significant modification of original signatures. The composition of the clay mineral phases can, however, still be evidence of the nature of the precursor materials providing evidence for an extraterrestrial impact event.completedSedimentary petrologyStratigraphyalterationAtlantic OceanBlake NoseBlake PlateaucatastrophismCenozoicchemical compositionChicxulub Craterclay mineralogyclay mineralscosmic dustCretaceouscrystal chemistryDeep Sea Drilling Projectdiagenesisejectafireballsformulaglass materialsimpact featuresK-T boundarylower PaleoceneMesozoicmetalsNorth AtlanticOcean Drilling ProgramPaleocenePaleogenepaleogeographyrare earthsSEM datasheet silicatessilicatessmectitestratigraphic boundaryTertiaryUpper CretaceousEnglishgeoscientificInformation-77.0000-76.000029.300030.3000Blake Nose