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Article: The Cretaceous-Tertiary boundary at Gubbio revisited: vertical extent of the Ir anomaly

TitleThe Cretaceous-Tertiary boundary at Gubbio revisited: vertical extent of the Ir anomaly
Authors
Issue Date1990
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/epsl
Citation
Earth and Planetary Science Letters, 1990, v. 99 n. 3, p. 206-219 How to Cite?
AbstractThe classical Gubbio (Italy) Cretaceous-Tertiary boundary section has been resampled for both magnetostratigraphy and iridium. Paleomagnetic samples were taken over 7 m in the Maastrichtian and 6 m in the Paleocene. Previous results obtained a decade ago are confirmed. The reversal sequence is well defined and the individual reversals are somewhat more precisely located. A noticeable difference is the location of the position of the 29N/29R limit which may be lowered by 20-30 cm in the stratigraphic column. This would imply that the KTB occurs near the middle of chron 29R. Iridium measurements were made on samples from both shales and surrounding limestone beds from 2 m below to 3 m above the boundary: these measurements indicate that Ir is associated with clay minerals. Concentrations in the two types of samples are indeed compatible when reduced to a carbonate-free basis. Iridium concentrations stand above background over almost 3 m of section, corresponding to half a million years based on magnetostratigraphy. This is likely to indicate a protracted duration of the (external or internal) source of iridium, on top of which the main (short-lived) KTB anomaly proper stands. © 1990.
Persistent Identifierhttp://hdl.handle.net/10722/92216
ISSN
2015 Impact Factor: 4.326
2015 SCImago Journal Rankings: 3.628

 

DC FieldValueLanguage
dc.contributor.authorRocchia, Ren_HK
dc.contributor.authorBoclet, Den_HK
dc.contributor.authorBonté, Phen_HK
dc.contributor.authorJéhanno, Cen_HK
dc.contributor.authorChen, Yen_HK
dc.contributor.authorCourtillot, Ven_HK
dc.contributor.authorMary, Cen_HK
dc.contributor.authorWezel, Fen_HK
dc.date.accessioned2010-09-17T10:39:30Z-
dc.date.available2010-09-17T10:39:30Z-
dc.date.issued1990en_HK
dc.identifier.citationEarth and Planetary Science Letters, 1990, v. 99 n. 3, p. 206-219en_HK
dc.identifier.issn0012-821Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/92216-
dc.description.abstractThe classical Gubbio (Italy) Cretaceous-Tertiary boundary section has been resampled for both magnetostratigraphy and iridium. Paleomagnetic samples were taken over 7 m in the Maastrichtian and 6 m in the Paleocene. Previous results obtained a decade ago are confirmed. The reversal sequence is well defined and the individual reversals are somewhat more precisely located. A noticeable difference is the location of the position of the 29N/29R limit which may be lowered by 20-30 cm in the stratigraphic column. This would imply that the KTB occurs near the middle of chron 29R. Iridium measurements were made on samples from both shales and surrounding limestone beds from 2 m below to 3 m above the boundary: these measurements indicate that Ir is associated with clay minerals. Concentrations in the two types of samples are indeed compatible when reduced to a carbonate-free basis. Iridium concentrations stand above background over almost 3 m of section, corresponding to half a million years based on magnetostratigraphy. This is likely to indicate a protracted duration of the (external or internal) source of iridium, on top of which the main (short-lived) KTB anomaly proper stands. © 1990.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/epslen_HK
dc.relation.ispartofEarth and Planetary Science Lettersen_HK
dc.titleThe Cretaceous-Tertiary boundary at Gubbio revisited: vertical extent of the Ir anomalyen_HK
dc.typeArticleen_HK
dc.identifier.emailChen, Y:ychenc@hkucc.hku.hken_HK
dc.identifier.authorityChen, Y=rp1318en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0025664327en_HK
dc.identifier.volume99en_HK
dc.identifier.issue3en_HK
dc.identifier.spage206en_HK
dc.identifier.epage219en_HK

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