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Article: Thermal evolution of Archean basement rocks from the eastern part of the North China craton and its bearing on tectonic setting

TitleThermal evolution of Archean basement rocks from the eastern part of the North China craton and its bearing on tectonic setting
Authors
KeywordsArchean
China
Metamorphic Rock
Issue Date1998
PublisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/TIGR
Citation
International Geology Review, 1998, v. 40 n. 8, p. 706-721 How to Cite?
AbstractThe basement rocks in the eastern zone of the North China craton are composed predominantly of pretectonic tonalitic-trondhjemitic-granodioritic gneisses and syntectonic granitoids, with rafts of supracrustal rocks consisting of ultramafic to felsic volcanic and sedimentary rocks, metamorphosed over a range of conditions from greenschist to granulite facies. Most mafic granulites, amphibolites, and some pelitic gneisses and schists preserve the prograde, peak, and post-peak textures. The prograde metamorphic stage is indicated by mineral inclusions within minerals of the peak stage, represented by the assemblages of hornblende + plagioclase + quartz ± biotite in mafic granulites, chlorite + actinolite + epidote + plagioclase + quartz in amphibolites, and biotite + plagioclase + quartz in pelitic gneisses. The peak stage is shown by assemblages of orthopyroxene + clinopyroxene + garnet + plagioclase + quartz in the mafic granulites, hornblende + plagioclase + quartz + garnet in garnetiferous amphibolites, and garnet + sillimanite + plagioclase + quartz + biotite in pelitic gneisses. The post-peak stage is represented by garnet + quartaz symplectic coronas in mafic granulites, actinolite + garnet retrogressive rims around garnet or hornblende grains in amphibolites, and kyanite replacing sillimanite or staurolite replacing sillimanite + garnet pelitic gneisses. These textural relations and their P-T estimates define counterclockwise P-T paths. The P-T-t(ime) paths of metamorphic rocks from the eastern zone reflect an origin related to the intrusion and underplating of large amounts of mantle-derived magmas that not only provided heat for the metamorphism but also added a large volume of mostly mafic material to the base of the crust. Crustal growth therefore was dominated by vertical addition of mantle-derived magmas to the crust. Combined with lithologic, structural, metamorphic, and geochronologic considerations, these large volumes of underplated magma are considered to be related to upwelling mantle plumes (hotspots).
Persistent Identifierhttp://hdl.handle.net/10722/151007
ISSN
2015 Impact Factor: 2.365
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DC FieldValueLanguage
dc.contributor.authorZhao, Gen_US
dc.contributor.authorWilde, SAen_US
dc.contributor.authorCawood, PAen_US
dc.date.accessioned2012-06-26T06:15:45Z-
dc.date.available2012-06-26T06:15:45Z-
dc.date.issued1998en_US
dc.identifier.citationInternational Geology Review, 1998, v. 40 n. 8, p. 706-721en_US
dc.identifier.issn0020-6814en_US
dc.identifier.urihttp://hdl.handle.net/10722/151007-
dc.description.abstractThe basement rocks in the eastern zone of the North China craton are composed predominantly of pretectonic tonalitic-trondhjemitic-granodioritic gneisses and syntectonic granitoids, with rafts of supracrustal rocks consisting of ultramafic to felsic volcanic and sedimentary rocks, metamorphosed over a range of conditions from greenschist to granulite facies. Most mafic granulites, amphibolites, and some pelitic gneisses and schists preserve the prograde, peak, and post-peak textures. The prograde metamorphic stage is indicated by mineral inclusions within minerals of the peak stage, represented by the assemblages of hornblende + plagioclase + quartz ± biotite in mafic granulites, chlorite + actinolite + epidote + plagioclase + quartz in amphibolites, and biotite + plagioclase + quartz in pelitic gneisses. The peak stage is shown by assemblages of orthopyroxene + clinopyroxene + garnet + plagioclase + quartz in the mafic granulites, hornblende + plagioclase + quartz + garnet in garnetiferous amphibolites, and garnet + sillimanite + plagioclase + quartz + biotite in pelitic gneisses. The post-peak stage is represented by garnet + quartaz symplectic coronas in mafic granulites, actinolite + garnet retrogressive rims around garnet or hornblende grains in amphibolites, and kyanite replacing sillimanite or staurolite replacing sillimanite + garnet pelitic gneisses. These textural relations and their P-T estimates define counterclockwise P-T paths. The P-T-t(ime) paths of metamorphic rocks from the eastern zone reflect an origin related to the intrusion and underplating of large amounts of mantle-derived magmas that not only provided heat for the metamorphism but also added a large volume of mostly mafic material to the base of the crust. Crustal growth therefore was dominated by vertical addition of mantle-derived magmas to the crust. Combined with lithologic, structural, metamorphic, and geochronologic considerations, these large volumes of underplated magma are considered to be related to upwelling mantle plumes (hotspots).en_US
dc.languageengen_US
dc.publisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/TIGRen_US
dc.relation.ispartofInternational Geology Reviewen_US
dc.subjectArcheanen_US
dc.subjectChinaen_US
dc.subjectMetamorphic Rocken_US
dc.titleThermal evolution of Archean basement rocks from the eastern part of the North China craton and its bearing on tectonic settingen_US
dc.typeArticleen_US
dc.identifier.emailZhao, G:gzhao@hkucc.hku.hken_US
dc.identifier.authorityZhao, G=rp00842en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0032456534en_US
dc.identifier.volume40en_US
dc.identifier.issue8en_US
dc.identifier.spage706en_US
dc.identifier.epage721en_US
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridZhao, G=7403296321en_US
dc.identifier.scopusauthoridWilde, SA=35254758600en_US
dc.identifier.scopusauthoridCawood, PA=7004146041en_US

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