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, JP1 2 3
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
2011 Impact Factor: 3.518
2011 SCImago Journal Rankings: 0.172
DOIhttp://dx.doi.org/10.1016/j.chemgeo.2009.03.011
ReferencesReferences in Scopus
DC Field
Value
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
2011 Impact Factor: 3.518
2011 SCImago Journal Rankings: 0.172
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
Author Affiliations
  1. China University of Geosciences
  2. The University of Hong Kong
  3. Macquarie University