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Article: Emeishan Basalts (SW China) and the 'end-Guadalupian' crisis: magnetobiostratigraphic constraints
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TitleEmeishan Basalts (SW China) and the 'end-Guadalupian' crisis: magnetobiostratigraphic constraints
 
AuthorsAli, JR1
Thompson, GM1
Song, X1
Wang, Y1
 
KeywordsChina
Extinction
Guadalupian
Magnetostratigraphy
Permian
Sichuan
 
Issue Date2002
 
PublisherGeological Society Publishing House. The Journal's web site is located at http://www.geolsoc.org.uk/gsl/publications/journals/jgs
 
CitationJournal of the Geological Society, 2002, v. 159 n. 1, p. 21-29 [How to Cite?]
DOI: http://dx.doi.org/10.1144/0016-764901086
 
AbstractA magnetostratigraphic investigation of the Permian Emeishan LIP (large igneous province) was carried out on a composite section in Ebian County, close to the type area in Sichuan, SW China. The main succession of twelve flows (175 m thick) carries a normal polarity whilst the one reliable site from the overlying 30 m thick volcanic waning sequence is marked by a reverse polarity. The data enable a correlation to be proposed with an Emeishan Basalt sequence in western Guizhou, c. 400 km to the SE. From our knowledge of the geomagnetic field's reversal behaviour during the Permian, it suggests that the main lava pile along the eastern half of the Emeishan Basalt outcrop belt was erupted within a half to one million years. Using magnetobiostratigraphic data from the adjacent South China platform, the normal polarity magnetozone is correlated with the normal polarity chron associated with the upper part of the Maokou Limestones. Constrained by conodont data, the main Emei Basalts appear to be at least two biozones older (1-1.5 Ma) than the Mid-Late Permian boundary. It is possible, however, that the Emei Basalt waning zone sequence, which represents an explosive volcanic phase, might be coeval with the 'end-Guadalupian' biotic crisis. Thus arguments implicating Emei Basalt volcanism as the causal mechanism behind this major global event have to accommodate the new relative-age constraints.
 
ISSN0016-7649
2012 Impact Factor: 2.583
2012 SCImago Journal Rankings: 1.653
 
DOIhttp://dx.doi.org/10.1144/0016-764901086
 
ISI Accession Number IDWOS:000173188600003
 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorAli, JR
 
dc.contributor.authorThompson, GM
 
dc.contributor.authorSong, X
 
dc.contributor.authorWang, Y
 
dc.date.accessioned2007-10-30T06:07:54Z
 
dc.date.available2007-10-30T06:07:54Z
 
dc.date.issued2002
 
dc.description.abstractA magnetostratigraphic investigation of the Permian Emeishan LIP (large igneous province) was carried out on a composite section in Ebian County, close to the type area in Sichuan, SW China. The main succession of twelve flows (175 m thick) carries a normal polarity whilst the one reliable site from the overlying 30 m thick volcanic waning sequence is marked by a reverse polarity. The data enable a correlation to be proposed with an Emeishan Basalt sequence in western Guizhou, c. 400 km to the SE. From our knowledge of the geomagnetic field's reversal behaviour during the Permian, it suggests that the main lava pile along the eastern half of the Emeishan Basalt outcrop belt was erupted within a half to one million years. Using magnetobiostratigraphic data from the adjacent South China platform, the normal polarity magnetozone is correlated with the normal polarity chron associated with the upper part of the Maokou Limestones. Constrained by conodont data, the main Emei Basalts appear to be at least two biozones older (1-1.5 Ma) than the Mid-Late Permian boundary. It is possible, however, that the Emei Basalt waning zone sequence, which represents an explosive volcanic phase, might be coeval with the 'end-Guadalupian' biotic crisis. Thus arguments implicating Emei Basalt volcanism as the causal mechanism behind this major global event have to accommodate the new relative-age constraints.
 
dc.description.naturepublished_or_final_version
 
dc.identifier.citationJournal of the Geological Society, 2002, v. 159 n. 1, p. 21-29 [How to Cite?]
DOI: http://dx.doi.org/10.1144/0016-764901086
 
dc.identifier.doihttp://dx.doi.org/10.1144/0016-764901086
 
dc.identifier.epage29
 
dc.identifier.hkuros69753
 
dc.identifier.isiWOS:000173188600003
 
dc.identifier.issn0016-7649
2012 Impact Factor: 2.583
2012 SCImago Journal Rankings: 1.653
 
dc.identifier.issue1
 
dc.identifier.openurl
 
dc.identifier.scopuseid_2-s2.0-0036144379
 
dc.identifier.spage21
 
dc.identifier.urihttp://hdl.handle.net/10722/44692
 
dc.identifier.volume159
 
dc.languageeng
 
dc.publisherGeological Society Publishing House. The Journal's web site is located at http://www.geolsoc.org.uk/gsl/publications/journals/jgs
 
dc.publisher.placeUnited Kingdom
 
dc.relation.ispartofJournal of the Geological Society
 
dc.relation.referencesReferences in Scopus
 
dc.rightsJournal of Geological Society. Copyright © Geological Society Publishing House.
 
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License
 
dc.subjectChina
 
dc.subjectExtinction
 
dc.subjectGuadalupian
 
dc.subjectMagnetostratigraphy
 
dc.subjectPermian
 
dc.subjectSichuan
 
dc.titleEmeishan Basalts (SW China) and the 'end-Guadalupian' crisis: magnetobiostratigraphic constraints
 
dc.typeArticle
 
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<description.abstract>A magnetostratigraphic investigation of the Permian Emeishan LIP (large igneous province) was carried out on a composite section in Ebian County, close to the type area in Sichuan, SW China. The main succession of twelve flows (175 m thick) carries a normal polarity whilst the one reliable site from the overlying 30 m thick volcanic waning sequence is marked by a reverse polarity. The data enable a correlation to be proposed with an Emeishan Basalt sequence in western Guizhou, c. 400 km to the SE. From our knowledge of the geomagnetic field&apos;s reversal behaviour during the Permian, it suggests that the main lava pile along the eastern half of the Emeishan Basalt outcrop belt was erupted within a half to one million years. Using magnetobiostratigraphic data from the adjacent South China platform, the normal polarity magnetozone is correlated with the normal polarity chron associated with the upper part of the Maokou Limestones. Constrained by conodont data, the main Emei Basalts appear to be at least two biozones older (1-1.5 Ma) than the Mid-Late Permian boundary. It is possible, however, that the Emei Basalt waning zone sequence, which represents an explosive volcanic phase, might be coeval with the &apos;end-Guadalupian&apos; biotic crisis. Thus arguments implicating Emei Basalt volcanism as the causal mechanism behind this major global event have to accommodate the new relative-age constraints.</description.abstract>
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Author Affiliations
  1. The University of Hong Kong