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Article: U-Pb zircon age constraints on the Dongwanzi ultramafic-mafic body, North China, confirm it is not an Archean ophiolite

TitleU-Pb zircon age constraints on the Dongwanzi ultramafic-mafic body, North China, confirm it is not an Archean ophiolite
Authors
KeywordsArchean
Dongwanzi
North China Craton
ophiolite
Phanerozoic
plate tectonics
Issue Date2007
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/epsl
Citation
Earth And Planetary Science Letters, 2007, v. 255 n. 1-2, p. 85-93 How to Cite?
AbstractIn Science May 11 2001 (p.1142-1145), Kusky et al. reported an ophiolite complex of late Archean age in the Dongwanzi area of the North China Craton, which has subsequently been considered a hallmark for Archean plate tectonics. However, this interpretation has been questioned because no convincing pillow lavas or sheeted dikes have been found in the Dongwanzi complex and, more importantly, as a major part of the ophiolite complex, the Dongwanzi ultramafic-mafic body has not previously been dated and it therefore remains unknown whether it is of Archean age. In this study, we carried out detailed field investigations and SHRIMP U-Pb zircon dating on the rocks of the Dongwanzi ultramafic-mafic body, as recognized by Kusky et al. Our field observations reveal that in several places along the boundaries of the Dongwanzi body, mafic dikes emanating from the main body intrude the country rocks of the unmetamorphosed Mesoproterozoic sedimentary successions of the Changcheng-Jixian 'System'. One of these dikes yielded a SHRIMP U-Pb zircon age of 306 ± 6 Ma, similar to the SHRIMP U-Pb zircon age of 308 ± 4 Ma obtained from a plagioclase-bearing pyroxenite from the Dongwanzi ultramafic-mafic body. Four other samples collected from various parts of the ultramafic-mafic body (gabbro, leucogabbro or pyroxenite) record similar SHRIMP U-Pb zircon ages around ∼ 300 Ma. Therefore, both field relationships and SHRIMP U-Pb zircon dating results unequivocally demonstrate that the Dongwanzi ultramafic-mafic body is not part of an Archean ophiolite. © 2006 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72729
ISSN
2015 Impact Factor: 4.326
2015 SCImago Journal Rankings: 3.628
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorWilde, SAen_HK
dc.contributor.authorLi, Sen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorGrant, MLen_HK
dc.contributor.authorLi, Xen_HK
dc.date.accessioned2010-09-06T06:44:33Z-
dc.date.available2010-09-06T06:44:33Z-
dc.date.issued2007en_HK
dc.identifier.citationEarth And Planetary Science Letters, 2007, v. 255 n. 1-2, p. 85-93en_HK
dc.identifier.issn0012-821Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/72729-
dc.description.abstractIn Science May 11 2001 (p.1142-1145), Kusky et al. reported an ophiolite complex of late Archean age in the Dongwanzi area of the North China Craton, which has subsequently been considered a hallmark for Archean plate tectonics. However, this interpretation has been questioned because no convincing pillow lavas or sheeted dikes have been found in the Dongwanzi complex and, more importantly, as a major part of the ophiolite complex, the Dongwanzi ultramafic-mafic body has not previously been dated and it therefore remains unknown whether it is of Archean age. In this study, we carried out detailed field investigations and SHRIMP U-Pb zircon dating on the rocks of the Dongwanzi ultramafic-mafic body, as recognized by Kusky et al. Our field observations reveal that in several places along the boundaries of the Dongwanzi body, mafic dikes emanating from the main body intrude the country rocks of the unmetamorphosed Mesoproterozoic sedimentary successions of the Changcheng-Jixian 'System'. One of these dikes yielded a SHRIMP U-Pb zircon age of 306 ± 6 Ma, similar to the SHRIMP U-Pb zircon age of 308 ± 4 Ma obtained from a plagioclase-bearing pyroxenite from the Dongwanzi ultramafic-mafic body. Four other samples collected from various parts of the ultramafic-mafic body (gabbro, leucogabbro or pyroxenite) record similar SHRIMP U-Pb zircon ages around ∼ 300 Ma. Therefore, both field relationships and SHRIMP U-Pb zircon dating results unequivocally demonstrate that the Dongwanzi ultramafic-mafic body is not part of an Archean ophiolite. © 2006 Elsevier B.V. All rights reserved.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.subjectArcheanen_HK
dc.subjectDongwanzien_HK
dc.subjectNorth China Cratonen_HK
dc.subjectophioliteen_HK
dc.subjectPhanerozoicen_HK
dc.subjectplate tectonicsen_HK
dc.titleU-Pb zircon age constraints on the Dongwanzi ultramafic-mafic body, North China, confirm it is not an Archean ophioliteen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0012-821X&volume=255&issue=1-2&spage=85&epage=93&date=2007&atitle=U-Pb+zircon+age+constraints+on+the+Dongwanzi+ultramafic-mafic+body,+North+China,+confirm+it+is+not+an+Archean+ophioliteen_HK
dc.identifier.emailZhao, G:gzhao@hkucc.hku.hken_HK
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.epsl.2006.12.007en_HK
dc.identifier.scopuseid_2-s2.0-33847237306en_HK
dc.identifier.hkuros127567en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33847237306&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume255en_HK
dc.identifier.issue1-2en_HK
dc.identifier.spage85en_HK
dc.identifier.epage93en_HK
dc.identifier.isiWOS:000245143600008-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridWilde, SA=35254758600en_HK
dc.identifier.scopusauthoridLi, S=8784176300en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridGrant, ML=15925527300en_HK
dc.identifier.scopusauthoridLi, X=35254067700en_HK

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