File Download
  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Longevity of the Permian Emeishan mantle plume (SW China): 1 Ma, 8 Ma or 18 Ma?

TitleLongevity of the Permian Emeishan mantle plume (SW China): 1 Ma, 8 Ma or 18 Ma?
Authors
KeywordsEmeishan large igneous province
Late Permian
Mafic dykes
Middle Permian
Middle Triassic
Issue Date2008
PublisherCambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=GEO
Citation
Geological Magazine, 2008, v. 145 n. 3, p. 373-388 How to Cite?
AbstractAfter the formation of the ∼ 260 Ma Emeishan large igneous province, there were two volumetrically minor magmatic pulses at ∼ 252 Ma and ∼ 242 Ma, respectively. Alkaline mafic dykes intruding both 260 Ma and 252 Ma felsic plutons in the Panxi region, southwestern China, have compositions similar to the Emeishan flood basalts. One dyke is dated using the SHRIMP zircon U-Pb technique at 242 ± 2 Ma, ∼ 18 Ma younger than the start of Emeishan magmatism. The dykes have enriched light rare earth element patterns (La/YbN = 4.4-18.8) and trace element patterns similar to the Emeishan flood basalts and average ocean-island basalts. Some trace element ratios of the dykes (Zr/Nb = 3.8-8.2, La/Nb = 0.4-1.7, Ba/La = 7.5-25.6) are somewhat similar to EM1 source material, however, there are differences. Their εNd values (εNd = +2.6 and +2.7) and ISr( ISr = 0.704542 and 0.704554) ratios are indicative of a mantle source. Thus Emeishan magmatism may have lasted for almost 20 Ma after the initial eruption. However, geological evidence precludes the possibility that the post-260 Ma magmatic events were directly related to Emeishan magmatism, which began at and ended shortly after 260 Ma. The 252 Ma plutons and 242 Ma dykes represent volumetrically minor melting of the fossil Emeishan plume-head beneath the Yangtze crust. The 252 Ma magmatic event was likely caused by post-flood basalt extension of the Yangtze crust, whereas the 242 Ma event was caused by decompressional melting associated with the collision between the South China and North China blocks during the Middle Triassic. © 2008 Cambridge University Press.
Persistent Identifierhttp://hdl.handle.net/10722/57268
ISSN
2015 Impact Factor: 1.863
2015 SCImago Journal Rankings: 1.119
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorShellnutt, JGen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorYan, DPen_HK
dc.contributor.authorWang, Yen_HK
dc.date.accessioned2010-04-12T01:31:20Z-
dc.date.available2010-04-12T01:31:20Z-
dc.date.issued2008en_HK
dc.identifier.citationGeological Magazine, 2008, v. 145 n. 3, p. 373-388en_HK
dc.identifier.issn0016-7568en_HK
dc.identifier.urihttp://hdl.handle.net/10722/57268-
dc.description.abstractAfter the formation of the ∼ 260 Ma Emeishan large igneous province, there were two volumetrically minor magmatic pulses at ∼ 252 Ma and ∼ 242 Ma, respectively. Alkaline mafic dykes intruding both 260 Ma and 252 Ma felsic plutons in the Panxi region, southwestern China, have compositions similar to the Emeishan flood basalts. One dyke is dated using the SHRIMP zircon U-Pb technique at 242 ± 2 Ma, ∼ 18 Ma younger than the start of Emeishan magmatism. The dykes have enriched light rare earth element patterns (La/YbN = 4.4-18.8) and trace element patterns similar to the Emeishan flood basalts and average ocean-island basalts. Some trace element ratios of the dykes (Zr/Nb = 3.8-8.2, La/Nb = 0.4-1.7, Ba/La = 7.5-25.6) are somewhat similar to EM1 source material, however, there are differences. Their εNd values (εNd = +2.6 and +2.7) and ISr( ISr = 0.704542 and 0.704554) ratios are indicative of a mantle source. Thus Emeishan magmatism may have lasted for almost 20 Ma after the initial eruption. However, geological evidence precludes the possibility that the post-260 Ma magmatic events were directly related to Emeishan magmatism, which began at and ended shortly after 260 Ma. The 252 Ma plutons and 242 Ma dykes represent volumetrically minor melting of the fossil Emeishan plume-head beneath the Yangtze crust. The 252 Ma magmatic event was likely caused by post-flood basalt extension of the Yangtze crust, whereas the 242 Ma event was caused by decompressional melting associated with the collision between the South China and North China blocks during the Middle Triassic. © 2008 Cambridge University Press.en_HK
dc.languageengen_HK
dc.publisherCambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=GEOen_HK
dc.relation.ispartofGeological Magazineen_HK
dc.rightsGeological Magazine. Copyright © Cambridge University Press.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectEmeishan large igneous provinceen_HK
dc.subjectLate Permianen_HK
dc.subjectMafic dykesen_HK
dc.subjectMiddle Permianen_HK
dc.subjectMiddle Triassicen_HK
dc.titleLongevity of the Permian Emeishan mantle plume (SW China): 1 Ma, 8 Ma or 18 Ma?en_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0016-7568&volume=145&issue=3&spage=373–388&epage=&date=2008&atitle=Longevity+of+the+Permian+Emeishan+mantle+plume(SW+China):+1Ma,+8Ma+or+18Ma?en_HK
dc.identifier.emailZhou, MF: mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1017/S0016756808004524en_HK
dc.identifier.scopuseid_2-s2.0-42649108713en_HK
dc.identifier.hkuros144292-
dc.identifier.hkuros167308-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-42649108713&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume145en_HK
dc.identifier.issue3en_HK
dc.identifier.spage373en_HK
dc.identifier.epage388en_HK
dc.identifier.isiWOS:000256175900005-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridShellnutt, JG=17343022500en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridYan, DP=36683417500en_HK
dc.identifier.scopusauthoridWang, Y=7601522285en_HK

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats