georefid:1983-061203SEDIS Publication Catalogue
ana.macario@awi.de
http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=1983-061203<gco:CharacterString>Spheroids at the Cretaceous-Tertiary boundary are altered impact droplets of basaltic composition</gco:CharacterString>1983-01-01publicationgeorefid:1983-061203Montanari, AlessandroUniv. Calif., Dep. Geol. and Geophys., Berkeley, CA, United StatesauthorHay, Richard L.Univ. Amsterdam, NetherlandsauthorAlvarez, WalterauthorAsaro, FrankauthorMichel, Helen V.authorAlvarez, Luis W.authorSmit, JanauthorGeological Society of America (GSA), Boulder, CO, United StatespublisherdocumentHardcopyGeology (Boulder)11 (11)668-671Spheroids of K-feldspar in boundary clay at Caravaca, southern Spain. Sand-size spheroids of K-feldspar, glauconite, and magnetite-quartz have been found in the C-T boundary clay in northern Italy, and spheroids of K-feldspar and pyrite were found in the boundary clay at Deep Sea Drilling Project Site 465A, in the central Pacific. Textures are similar to those of rapidly crystallized feldspar and mafic silicates. Diagenetically altered microcrystalline spherules of basaltic composition produced by the impact of a large asteroid in an ocean basin at the end of the Cretaceous. Analogous to the glassy microtektites produced by impacts on more siliceous target rocks.--Modified journal abstract.completedStratigraphyalkali feldsparbasaltic compositionCaravaca SpainCenozoicclastic sedimentsclayCretaceousDeep Sea Drilling ProjectdiagenesisDSDP Site 465Europefeldspar groupframework silicatesglauconiteHess RiseIberian Peninsulaimpact featuresimpactsIPODItalyK-feldsparLeg 62lithostratigraphylower TertiarymagnetiteMesozoicmica groupmineral compositionMurcia ProvinceMurcia regionMurcia SpainNorth PacificNorthwest PacificoceanographyoxidesPacific OceanPaleocenePaleogenePetricciopyritequartzsedimentary petrologysedimentssheet silicatessilica mineralssilicatesSouthern EuropeSpainspherulesstratigraphic boundarystratigraphysulfidesTertiarytexturesUpper CretaceousVeneto ItalyWest Pacificurn:org.iodp:exp:62urnlargerWorkCitationcampaignurn:org.iodp:exp:62:site:465urnlargerWorkCitationstudyurn:org.iodp:exp:62urnlargerWorkCitationcampaignEnglishgeoscientificInformation-2.200012.384232.000045.3642Murcia Spain