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Article: A mechanism for transforming buoyant North Chinese cratonic lithosphere to a denser equivalent for delamination

TitleA mechanism for transforming buoyant North Chinese cratonic lithosphere to a denser equivalent for delamination
Authors
Issue Date2007
PublisherGeological Society Publishing House. The Journal's web site is located at http://www.geolsoc.org.uk/sp
Citation
Geological Society Special Publication, 2007, v. 280, p. 317-330 How to Cite?
AbstractTwo models have been proposed to explain lithospheric thinning of North Chinese cratonic lithosphere: (1) thermal erosion or/and chemical metasomatism, causing the lower part of the lithospheric mantle to be transformed into asthenosphere, a mechanism that implies thinning of relatively buoyant lithosphere; (2) the delamination of lithospheric mantle, in whole or part, along with the lowermost crust, as an effect of their increased densities relative to the underlying asthenosphere. This paper explores possible mechanisms whereby buoyant cratonic lithosphere might be transformed into a denser equivalent susceptible to delamination by the convecting asthenosphere. The Yanshan mobile belt in Eastern China developed in response to a combination of subduction and collision. Its apparent 'counterclockwise' P-T-t metamorphic evolution suggests that underplated basaltic magma may have heated and, in turn, weakened the cool, rigid crust, allowing for compressional deformation and crustal thickening. Based on three independent lines of evidence (compressional deformation, the record of igneous activity, and lower crustal xenoliths) the thickness of continental crust is estimated to be about 50-65 km. Along with petrological and geochemical studies, thermal modelling shows that large-scale input of asthenospheric basaltic magma leads to granitoid partial melts in the lower crust, and the dominance of high-pressure eclogitic products following orogenic thickening may be necessary for eventual delamination to occur. © The Geological Society of London 2007.
Persistent Identifierhttp://hdl.handle.net/10722/151210
ISSN
2015 SCImago Journal Rankings: 0.747
References

 

DC FieldValueLanguage
dc.contributor.authorDeng, JFen_US
dc.contributor.authorZhou, MFen_US
dc.contributor.authorFlower, MFJen_US
dc.contributor.authorSu, SGen_US
dc.contributor.authorZhai, MGen_US
dc.contributor.authorLiu, Cen_US
dc.contributor.authorZhao, GCen_US
dc.contributor.authorZhao, XGen_US
dc.contributor.authorZhou, Sen_US
dc.contributor.authorWu, ZWen_US
dc.date.accessioned2012-06-26T06:18:42Z-
dc.date.available2012-06-26T06:18:42Z-
dc.date.issued2007en_US
dc.identifier.citationGeological Society Special Publication, 2007, v. 280, p. 317-330en_US
dc.identifier.issn0305-8719en_US
dc.identifier.urihttp://hdl.handle.net/10722/151210-
dc.description.abstractTwo models have been proposed to explain lithospheric thinning of North Chinese cratonic lithosphere: (1) thermal erosion or/and chemical metasomatism, causing the lower part of the lithospheric mantle to be transformed into asthenosphere, a mechanism that implies thinning of relatively buoyant lithosphere; (2) the delamination of lithospheric mantle, in whole or part, along with the lowermost crust, as an effect of their increased densities relative to the underlying asthenosphere. This paper explores possible mechanisms whereby buoyant cratonic lithosphere might be transformed into a denser equivalent susceptible to delamination by the convecting asthenosphere. The Yanshan mobile belt in Eastern China developed in response to a combination of subduction and collision. Its apparent 'counterclockwise' P-T-t metamorphic evolution suggests that underplated basaltic magma may have heated and, in turn, weakened the cool, rigid crust, allowing for compressional deformation and crustal thickening. Based on three independent lines of evidence (compressional deformation, the record of igneous activity, and lower crustal xenoliths) the thickness of continental crust is estimated to be about 50-65 km. Along with petrological and geochemical studies, thermal modelling shows that large-scale input of asthenospheric basaltic magma leads to granitoid partial melts in the lower crust, and the dominance of high-pressure eclogitic products following orogenic thickening may be necessary for eventual delamination to occur. © The Geological Society of London 2007.en_US
dc.languageengen_US
dc.publisherGeological Society Publishing House. The Journal's web site is located at http://www.geolsoc.org.uk/spen_US
dc.relation.ispartofGeological Society Special Publicationen_US
dc.titleA mechanism for transforming buoyant North Chinese cratonic lithosphere to a denser equivalent for delaminationen_US
dc.typeArticleen_US
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_US
dc.identifier.emailZhao, GC:gzhao@hkucc.hku.hken_US
dc.identifier.authorityZhou, MF=rp00844en_US
dc.identifier.authorityZhao, GC=rp00842en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1144/SP280.17en_US
dc.identifier.scopuseid_2-s2.0-34447576856en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34447576856&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume280en_US
dc.identifier.spage317en_US
dc.identifier.epage330en_US
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridDeng, JF=14121139200en_US
dc.identifier.scopusauthoridZhou, MF=7403506005en_US
dc.identifier.scopusauthoridFlower, MFJ=7006761584en_US
dc.identifier.scopusauthoridSu, SG=7402030074en_US
dc.identifier.scopusauthoridZhai, MG=7007119530en_US
dc.identifier.scopusauthoridLiu, C=50162024600en_US
dc.identifier.scopusauthoridZhao, GC=7403296321en_US
dc.identifier.scopusauthoridZhao, XG=50162685600en_US
dc.identifier.scopusauthoridZhou, S=7404165292en_US
dc.identifier.scopusauthoridWu, ZW=7501410032en_US

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