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Article: Thermal evolution of two textural types of mafic granulites in the North China craton: Evidence for both mantle plume and collisional tectonics

TitleThermal evolution of two textural types of mafic granulites in the North China craton: Evidence for both mantle plume and collisional tectonics
Authors
Issue Date1999
PublisherCambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=GEO
Citation
Geological Magazine, 1999, v. 136 n. 3, p. 223-240 How to Cite?
AbstractMafic granulites from the North China craton can be divided into two textural types, referred to as A- and B-types. A-type mafic granulites display garnet + quartz symplectic coronas, and outcrop in the eastern and western zones of the craton, whereas B-type mafic granulites exhibit orthopyroxene + plagioclase ± clinopyroxene symplectites or coronas, and are mainly exposed in the central zone of the craton. Most A-type mafic granulites preserve the prograde (M 1), peak (M 2) and post-peak near-isobaric cooling (M 3) assemblages, which are represented respectively by inclusions of hornblende + plagioclase + quartz, a peak mineralogy of orthopyroxene + clinopyroxene + plagioclase + quartz + garnet, and overprinted by garnet + quartz sympletic coronas. These mineral assemblages and their P-T (pressure-temperature) estimates define anticlockwise P-T evolutionary paths. The B-type mafic granulites preserve the peak (M 1), post-peak near-isothermal decompression (M 2) and cooling (M 3) assemblages, which are represented by the peak assemblage of orthopyroxene + clinopyroxene + plagioclase + quartz + garnet ± hornblende, post-peak orthopyroxene + plagioclase ± clinopyroxene symplectites or coronas, and later hornblende + plagioclase + magnetite symplectites, respectively. These mineral assemblages and their P-T estimates define clockwise P-T paths. The anticlockwise P-T paths of the A-type mafic granulites in the eastern and western zones of the North China craton are consistent with a model of underplating and intrusion of mantle-derived magmas. In combination with lithological, structural and geochronological data, the eastern and western zones of the North China craton are considered to represent two continental blocks that developed through the interaction of mantle plumes with the lithosphere from the Palaeoarchaean to the Neoarchaean era. The B-type mafic granulites and associated rocks in the central zone represent a magmatic arc that was metamorphosed and deformed during amalgamation of the eastern and western continental blocks in the late Palaeoproterozoic era. The mineral reaction relations and clockwise P-T paths of the B-type mafic granulites from the central zone record the tectonothermal history of the collision that resulted in the final assembly of the North China craton at c. 1800 Ma.
Persistent Identifierhttp://hdl.handle.net/10722/151012
ISSN
2015 Impact Factor: 1.863
2015 SCImago Journal Rankings: 1.119
ISI Accession Number ID
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DC FieldValueLanguage
dc.contributor.authorZhao, Gen_US
dc.contributor.authorWilde, SAen_US
dc.contributor.authorCawood, PAen_US
dc.contributor.authorLu, Len_US
dc.date.accessioned2012-06-26T06:15:49Z-
dc.date.available2012-06-26T06:15:49Z-
dc.date.issued1999en_US
dc.identifier.citationGeological Magazine, 1999, v. 136 n. 3, p. 223-240en_US
dc.identifier.issn0016-7568en_US
dc.identifier.urihttp://hdl.handle.net/10722/151012-
dc.description.abstractMafic granulites from the North China craton can be divided into two textural types, referred to as A- and B-types. A-type mafic granulites display garnet + quartz symplectic coronas, and outcrop in the eastern and western zones of the craton, whereas B-type mafic granulites exhibit orthopyroxene + plagioclase ± clinopyroxene symplectites or coronas, and are mainly exposed in the central zone of the craton. Most A-type mafic granulites preserve the prograde (M 1), peak (M 2) and post-peak near-isobaric cooling (M 3) assemblages, which are represented respectively by inclusions of hornblende + plagioclase + quartz, a peak mineralogy of orthopyroxene + clinopyroxene + plagioclase + quartz + garnet, and overprinted by garnet + quartz sympletic coronas. These mineral assemblages and their P-T (pressure-temperature) estimates define anticlockwise P-T evolutionary paths. The B-type mafic granulites preserve the peak (M 1), post-peak near-isothermal decompression (M 2) and cooling (M 3) assemblages, which are represented by the peak assemblage of orthopyroxene + clinopyroxene + plagioclase + quartz + garnet ± hornblende, post-peak orthopyroxene + plagioclase ± clinopyroxene symplectites or coronas, and later hornblende + plagioclase + magnetite symplectites, respectively. These mineral assemblages and their P-T estimates define clockwise P-T paths. The anticlockwise P-T paths of the A-type mafic granulites in the eastern and western zones of the North China craton are consistent with a model of underplating and intrusion of mantle-derived magmas. In combination with lithological, structural and geochronological data, the eastern and western zones of the North China craton are considered to represent two continental blocks that developed through the interaction of mantle plumes with the lithosphere from the Palaeoarchaean to the Neoarchaean era. The B-type mafic granulites and associated rocks in the central zone represent a magmatic arc that was metamorphosed and deformed during amalgamation of the eastern and western continental blocks in the late Palaeoproterozoic era. The mineral reaction relations and clockwise P-T paths of the B-type mafic granulites from the central zone record the tectonothermal history of the collision that resulted in the final assembly of the North China craton at c. 1800 Ma.en_US
dc.languageengen_US
dc.publisherCambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=GEOen_US
dc.relation.ispartofGeological Magazineen_US
dc.titleThermal evolution of two textural types of mafic granulites in the North China craton: Evidence for both mantle plume and collisional tectonicsen_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.doi10.1017/S001675689900254Xen_US
dc.identifier.scopuseid_2-s2.0-0032825978en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0032825978&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume136en_US
dc.identifier.issue3en_US
dc.identifier.spage223en_US
dc.identifier.epage240en_US
dc.identifier.isiWOS:000081208000001-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridZhao, G=7403296321en_US
dc.identifier.scopusauthoridWilde, SA=35254758600en_US
dc.identifier.scopusauthoridCawood, PA=7004146041en_US
dc.identifier.scopusauthoridLu, L=7403963741en_US

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