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Article: Thermal and petrological structure of the lithosphere beneath Hannuoba, Sino-Korean Craton, China: Evidence from xenoliths

TitleThermal and petrological structure of the lithosphere beneath Hannuoba, Sino-Korean Craton, China: Evidence from xenoliths
Authors
KeywordsEastern China lithosphere
Granulite xenoliths
Hannuoba lithosphere structure
Mantle trace elements
Mantle xenoliths
Sino-Korean Craton
Issue Date2001
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2001, v. 56 n. 4, p. 267-301 How to Cite?
AbstractDeep-seated xenoliths entrained in the Hannuoba basalts of the northern Sino-Korean Craton include mafic and felsic granulites, mantle wall-rock from spinel- and garnet-spinel peridotite facies, and basaltic crystallisation products from the spinel-pyroxenite and garnet-pyroxenite stability fields. The mineral compositions of the xenoliths have been used to estimate temperatures and, where possible, pressures of equilibration, and to construct a geothermal framework to interpret the upper mantle and lower crustal rock-type sequences for the region. The xenolith-derived paleogeotherm is constrained in the depth interval of 45-65 km and like others from areas of young basalt magmatism, is elevated and strongly convex toward the temperature axis. Two-pyroxene granulites give the lowest temperatures and garnet pyroxenites the highest, while the spinel lherzolites fall between these two groups. The present-day Moho beneath the Hannuoba area is defined at 42 km by seismic data, and coincides with the deepest occurrence of granulite. Above this boundary, there is a lower crust-upper mantle transition zone about 10-km thick, in which spinel lherzolites and mafic granulites (with variable plagioclase contents) are intermixed. It is inferred that this underplating has resulted in a lowering of the original pre-Cenozoic Moho (then coinciding with the crust-mantle boundary, CMB) from about 30 km to its present-day position and was due to intrusions of basaltic magmas that displaced peridotite mantle wall-rock and equilibrated to mafic granulites. Trace element patterns of the diopsides (analysed by laser ablation-ICPMS) from the Cr-diopside series spinel lherzolites and associated layered xenoliths (spinel lherzolites and pyroxenites) indicate a fertile uppermost mantle with moderate depletion by low degrees of partial melting and little evidence of metasomatic activity. The similarity in major and trace element compositions of the minerals in both rock types suggests that the layered ultramafic xenoliths formed by mantle deformation processes (metamorphic segregation), rather than by melt veining or metasomatism. © 2001 Elsevier Science B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/73010
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChen, Sen_HK
dc.contributor.authorO'Reilly, SYen_HK
dc.contributor.authorZhou, Xen_HK
dc.contributor.authorGriffin, WLen_HK
dc.contributor.authorZhang, Gen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorFeng, Jen_HK
dc.contributor.authorZhang, Men_HK
dc.date.accessioned2010-09-06T06:47:12Z-
dc.date.available2010-09-06T06:47:12Z-
dc.date.issued2001en_HK
dc.identifier.citationLithos, 2001, v. 56 n. 4, p. 267-301en_HK
dc.identifier.issn0024-4937en_HK
dc.identifier.urihttp://hdl.handle.net/10722/73010-
dc.description.abstractDeep-seated xenoliths entrained in the Hannuoba basalts of the northern Sino-Korean Craton include mafic and felsic granulites, mantle wall-rock from spinel- and garnet-spinel peridotite facies, and basaltic crystallisation products from the spinel-pyroxenite and garnet-pyroxenite stability fields. The mineral compositions of the xenoliths have been used to estimate temperatures and, where possible, pressures of equilibration, and to construct a geothermal framework to interpret the upper mantle and lower crustal rock-type sequences for the region. The xenolith-derived paleogeotherm is constrained in the depth interval of 45-65 km and like others from areas of young basalt magmatism, is elevated and strongly convex toward the temperature axis. Two-pyroxene granulites give the lowest temperatures and garnet pyroxenites the highest, while the spinel lherzolites fall between these two groups. The present-day Moho beneath the Hannuoba area is defined at 42 km by seismic data, and coincides with the deepest occurrence of granulite. Above this boundary, there is a lower crust-upper mantle transition zone about 10-km thick, in which spinel lherzolites and mafic granulites (with variable plagioclase contents) are intermixed. It is inferred that this underplating has resulted in a lowering of the original pre-Cenozoic Moho (then coinciding with the crust-mantle boundary, CMB) from about 30 km to its present-day position and was due to intrusions of basaltic magmas that displaced peridotite mantle wall-rock and equilibrated to mafic granulites. Trace element patterns of the diopsides (analysed by laser ablation-ICPMS) from the Cr-diopside series spinel lherzolites and associated layered xenoliths (spinel lherzolites and pyroxenites) indicate a fertile uppermost mantle with moderate depletion by low degrees of partial melting and little evidence of metasomatic activity. The similarity in major and trace element compositions of the minerals in both rock types suggests that the layered ultramafic xenoliths formed by mantle deformation processes (metamorphic segregation), rather than by melt veining or metasomatism. © 2001 Elsevier Science 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/lithosen_HK
dc.relation.ispartofLithosen_HK
dc.rightsLithos. Copyright © Elsevier BV.en_HK
dc.subjectEastern China lithosphereen_HK
dc.subjectGranulite xenolithsen_HK
dc.subjectHannuoba lithosphere structureen_HK
dc.subjectMantle trace elementsen_HK
dc.subjectMantle xenolithsen_HK
dc.subjectSino-Korean Cratonen_HK
dc.titleThermal and petrological structure of the lithosphere beneath Hannuoba, Sino-Korean Craton, China: Evidence from xenolithsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0024-4937&volume=56&spage=267&epage=301&date=2001&atitle=Thermal+and+petrological+structure+of+the+lithosphere+beneath+Hannuoba,+Sino-Korean+Craton,+China:+evidence+from+xenoliths.en_HK
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/S0024-4937(00)00065-7en_HK
dc.identifier.scopuseid_2-s2.0-0035032618en_HK
dc.identifier.hkuros57975en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0035032618&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume56en_HK
dc.identifier.issue4en_HK
dc.identifier.spage267en_HK
dc.identifier.epage301en_HK
dc.identifier.isiWOS:000168372300001-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridChen, S=7410257853en_HK
dc.identifier.scopusauthoridO'Reilly, SY=7103188930en_HK
dc.identifier.scopusauthoridZhou, X=48961487000en_HK
dc.identifier.scopusauthoridGriffin, WL=35229299300en_HK
dc.identifier.scopusauthoridZhang, G=48961526400en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridFeng, J=48961001800en_HK
dc.identifier.scopusauthoridZhang, M=36072753300en_HK

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