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Article: Magnetostratigraphic reinvestigation of the Palaeocene/Eocene boundary interval in Hole 690B, Maud Rise, Antarctica

TitleMagnetostratigraphic reinvestigation of the Palaeocene/Eocene boundary interval in Hole 690B, Maud Rise, Antarctica
Authors
KeywordsMagnetization
Magnetostratigraphy
Marine sediments
Ocean drilling program
Issue Date2000
PublisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/GJI
Citation
Geophysical Journal International, 2000, v. 141 n. 3, p. 639-646 How to Cite?
AbstractHole 690B, drilled on Maud Rise near Antarctica, provides one of the most important Palaeocene/Eocene boundary interval sections. Magnetostratigraphy plays a key role in dating Palaeocene/Eocene boundary events, but there are two problems with the published scheme in Hole 690B. The first concerns major mismatches of several magnetozones and biozones in the succession. The second is an unexplained pervasive declination cluster, which should not be present in these azimuthally unoriented piston cores. To resolve these issues, a palaeomagnetic reinvestigation was carried out on 98 specimens from 12 cores through the upper Palaeocene-middle Eocene section in Hole 690B. The bulk of the samples carry an approximately uniformly directed magnetically hard component resulting in a declination cluster effectively identical to that of the earlier study. The spurious magnetization can be explained either as an 'inward-radial magnetization' or as a 'core-split overprint'. By estimating the extent of the overprint within each sample, it has been possible to construct a filtered magnetostratigraphy for the section. The result is that many of the magnetozone-biozone mismatches are eliminated, and the record of the 2.5 Myr Chron C24r, which brackets the various events associated with the Palaeocene/Eocene boundary, is considerably cleaner. It is not possible to define the upper and lower boundaries of this magnetochron, so we recommend that the dating of the events within this section be based on the biostratigraphy only.
Persistent Identifierhttp://hdl.handle.net/10722/72904
ISSN
2015 Impact Factor: 2.484
2015 SCImago Journal Rankings: 1.839
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorAli, JRen_HK
dc.contributor.authorKent, DVen_HK
dc.contributor.authorHailwood, EAen_HK
dc.date.accessioned2010-09-06T06:46:12Z-
dc.date.available2010-09-06T06:46:12Z-
dc.date.issued2000en_HK
dc.identifier.citationGeophysical Journal International, 2000, v. 141 n. 3, p. 639-646en_HK
dc.identifier.issn0956-540Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/72904-
dc.description.abstractHole 690B, drilled on Maud Rise near Antarctica, provides one of the most important Palaeocene/Eocene boundary interval sections. Magnetostratigraphy plays a key role in dating Palaeocene/Eocene boundary events, but there are two problems with the published scheme in Hole 690B. The first concerns major mismatches of several magnetozones and biozones in the succession. The second is an unexplained pervasive declination cluster, which should not be present in these azimuthally unoriented piston cores. To resolve these issues, a palaeomagnetic reinvestigation was carried out on 98 specimens from 12 cores through the upper Palaeocene-middle Eocene section in Hole 690B. The bulk of the samples carry an approximately uniformly directed magnetically hard component resulting in a declination cluster effectively identical to that of the earlier study. The spurious magnetization can be explained either as an 'inward-radial magnetization' or as a 'core-split overprint'. By estimating the extent of the overprint within each sample, it has been possible to construct a filtered magnetostratigraphy for the section. The result is that many of the magnetozone-biozone mismatches are eliminated, and the record of the 2.5 Myr Chron C24r, which brackets the various events associated with the Palaeocene/Eocene boundary, is considerably cleaner. It is not possible to define the upper and lower boundaries of this magnetochron, so we recommend that the dating of the events within this section be based on the biostratigraphy only.en_HK
dc.languageengen_HK
dc.publisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/GJIen_HK
dc.relation.ispartofGeophysical Journal Internationalen_HK
dc.rightsGeophysical Journal International. Copyright © Blackwell Publishing Ltd.en_HK
dc.subjectMagnetizationen_HK
dc.subjectMagnetostratigraphyen_HK
dc.subjectMarine sedimentsen_HK
dc.subjectOcean drilling programen_HK
dc.titleMagnetostratigraphic reinvestigation of the Palaeocene/Eocene boundary interval in Hole 690B, Maud Rise, Antarcticaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0956-540X&volume=114&spage=639&epage=646&date=2000&atitle=Magnetostratigraphic+reinvestigation+of+the+Palaeocene/Eocene+boundary+interval+in+Hole+690B,+Maud+Rise,+Antarcticaen_HK
dc.identifier.emailAli, JR:jrali@hku.hken_HK
dc.identifier.authorityAli, JR=rp00659en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1046/j.1365-246X.2000.00109.xen_HK
dc.identifier.scopuseid_2-s2.0-0034033787en_HK
dc.identifier.hkuros55606en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034033787&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume141en_HK
dc.identifier.issue3en_HK
dc.identifier.spage639en_HK
dc.identifier.epage646en_HK
dc.identifier.isiWOS:000087554000009-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridAli, JR=7102266465en_HK
dc.identifier.scopusauthoridKent, DV=7202552559en_HK
dc.identifier.scopusauthoridHailwood, EA=7004220927en_HK

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