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Article: Age and composition of granulite and pyroxenite xenoliths in Hannuoba basalts reflect Paleogene underplating beneath the North China Craton
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TitleAge and composition of granulite and pyroxenite xenoliths in Hannuoba basalts reflect Paleogene underplating beneath the North China Craton
 
AuthorsZheng, JP3 1 2
Griffin, WL3
Qi, L2
O'reilly, SY3
Sun, M2
Zheng, S1
Pearson, N3
Gao, JF2
Yu, CM1
Su, YP1
Tang, HY1
Liu, QS1
Wu, XL1
 
KeywordsGranulite
Lithospheric Evolution
Lower Crustal Xenolith
North China Craton
Paleogene Underplating
Pyroxenite
 
Issue Date2009
 
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeo
 
CitationChemical Geology, 2009, v. 264 n. 1-4, p. 266-280 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.chemgeo.2009.03.011
 
AbstractIn situ U-Pb and Hf-isotope systematics of zircons, mineral chemistry of silicates and whole-rock major-element, trace-element and platinum-group element (PGE) data are reported for five mafic xenoliths (granulites and pyroxenite) in the Hannuoba Cenozoic basalts, North China. Temperature estimates of 859-886 °C suggest that these xenoliths are derived from the lower crust. The whole-rock compositions of the xenoliths show weakly negative Eu anomalies (δEu = 0.67-0.95), high SiO 2/Al 2O 3 (5.80-13.8), low Ir (0.10-0.29 ppb), and wide ranges of Ni (4.5-235 ppm) and La/Nb (1.70-7.64). Most zircons in these samples are structureless and give Paleogene (44.5-47.3 Ma) U-Pb ages; minor populations have Early Mesozoic (210-220 Ma), Late Mesozoic (90 Ma) and Neogene (14 Ma) ages. The fractionation of pyroxene and plagioclase controlled the petrogenesis of the xenoliths, which are interpreted as the products of basaltic underplating and fractionation (cumulates) in Paleogene time (45-47 Ma), with assimilation of some older intermediate crustal components. The Paleogene underplating corresponds in time to lithosphere-scale extension in the North China Craton, leading to the widespread formation of sedimentary basins. Most Paleogene zircons have positive ε Hf (up to + 13.2) with uniform T DM (0.46-0.50 Ga), whereas most Mesozoic zircons have negative ε Hf; this evolution suggests a temporal decrease in the degree of crustal assimilation during the extension of the lithosphere. In addition to complex modification in Early and Late Mesozoic times, the thermal event related to the eruption of the host magmas (ca 14 Ma) also reheated the lower crust beneath the North China Craton. © 2009 Elsevier B.V. All rights reserved.
 
ISSN0009-2541
2013 Impact Factor: 3.482
2013 SCImago Journal Rankings: 1.927
 
DOIhttp://dx.doi.org/10.1016/j.chemgeo.2009.03.011
 
ISI Accession Number IDWOS:000267379900022
 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorZheng, JP
 
dc.contributor.authorGriffin, WL
 
dc.contributor.authorQi, L
 
dc.contributor.authorO'reilly, SY
 
dc.contributor.authorSun, M
 
dc.contributor.authorZheng, S
 
dc.contributor.authorPearson, N
 
dc.contributor.authorGao, JF
 
dc.contributor.authorYu, CM
 
dc.contributor.authorSu, YP
 
dc.contributor.authorTang, HY
 
dc.contributor.authorLiu, QS
 
dc.contributor.authorWu, XL
 
dc.date.accessioned2012-06-26T06:20:05Z
 
dc.date.available2012-06-26T06:20:05Z
 
dc.date.issued2009
 
dc.description.abstractIn situ U-Pb and Hf-isotope systematics of zircons, mineral chemistry of silicates and whole-rock major-element, trace-element and platinum-group element (PGE) data are reported for five mafic xenoliths (granulites and pyroxenite) in the Hannuoba Cenozoic basalts, North China. Temperature estimates of 859-886 °C suggest that these xenoliths are derived from the lower crust. The whole-rock compositions of the xenoliths show weakly negative Eu anomalies (δEu = 0.67-0.95), high SiO 2/Al 2O 3 (5.80-13.8), low Ir (0.10-0.29 ppb), and wide ranges of Ni (4.5-235 ppm) and La/Nb (1.70-7.64). Most zircons in these samples are structureless and give Paleogene (44.5-47.3 Ma) U-Pb ages; minor populations have Early Mesozoic (210-220 Ma), Late Mesozoic (90 Ma) and Neogene (14 Ma) ages. The fractionation of pyroxene and plagioclase controlled the petrogenesis of the xenoliths, which are interpreted as the products of basaltic underplating and fractionation (cumulates) in Paleogene time (45-47 Ma), with assimilation of some older intermediate crustal components. The Paleogene underplating corresponds in time to lithosphere-scale extension in the North China Craton, leading to the widespread formation of sedimentary basins. Most Paleogene zircons have positive ε Hf (up to + 13.2) with uniform T DM (0.46-0.50 Ga), whereas most Mesozoic zircons have negative ε Hf; this evolution suggests a temporal decrease in the degree of crustal assimilation during the extension of the lithosphere. In addition to complex modification in Early and Late Mesozoic times, the thermal event related to the eruption of the host magmas (ca 14 Ma) also reheated the lower crust beneath the North China Craton. © 2009 Elsevier B.V. All rights reserved.
 
dc.description.naturelink_to_subscribed_fulltext
 
dc.identifier.citationChemical Geology, 2009, v. 264 n. 1-4, p. 266-280 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.chemgeo.2009.03.011
 
dc.identifier.doihttp://dx.doi.org/10.1016/j.chemgeo.2009.03.011
 
dc.identifier.epage280
 
dc.identifier.isiWOS:000267379900022
 
dc.identifier.issn0009-2541
2013 Impact Factor: 3.482
2013 SCImago Journal Rankings: 1.927
 
dc.identifier.issue1-4
 
dc.identifier.scopuseid_2-s2.0-67349132361
 
dc.identifier.spage266
 
dc.identifier.urihttp://hdl.handle.net/10722/151284
 
dc.identifier.volume264
 
dc.languageeng
 
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeo
 
dc.publisher.placeNetherlands
 
dc.relation.ispartofChemical Geology
 
dc.relation.referencesReferences in Scopus
 
dc.subjectGranulite
 
dc.subjectLithospheric Evolution
 
dc.subjectLower Crustal Xenolith
 
dc.subjectNorth China Craton
 
dc.subjectPaleogene Underplating
 
dc.subjectPyroxenite
 
dc.titleAge and composition of granulite and pyroxenite xenoliths in Hannuoba basalts reflect Paleogene underplating beneath the North China Craton
 
dc.typeArticle
 
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Author Affiliations
  1. China University of Geosciences
  2. The University of Hong Kong
  3. Macquarie University