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Article: Timing of metamorphism in the Paleoproterozoic Jiao-Liao-Ji Belt: New SHRIMP U-Pb zircon dating of granulites, gneisses and marbles of the Jiaobei massif in the North China Craton

TitleTiming of metamorphism in the Paleoproterozoic Jiao-Liao-Ji Belt: New SHRIMP U-Pb zircon dating of granulites, gneisses and marbles of the Jiaobei massif in the North China Craton
Authors
KeywordsJiao-Liao-Ji Belt
North China Craton
Paleoproterozoic metamorphism
SHRIMP U-Th-Pb zircon geochronology
Issue Date2011
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcr
Citation
Gondwana Research, 2011, v. 19 n. 1, p. 150-162 How to Cite?
AbstractThe Paleoproterozoic Jiao-Liao-Ji Belt lies in the Eastern Block of the North China Craton, with its southern segment extending across the Bohai Sea into the Jiaobei massif. High-pressure pelitic and mafic granulites have been recently recognized in the Paleoproterozoic Jingshan Group (Jiaobei massif). New SHRIMP U-Th-Pb geochronology combined with cathodoluminescence (CL) imaging of zircon has been applied to the determination of the timing of the metamorphism of the high-temperature and high-pressure granulites and associated gneisses and marbles. Metamorphic zircons in these high-pressure granulites, gneisses and marbles occur as either single grains or overgrowth (or recrystallization) rims surrounding and truncating oscillatory-zoned magmatic zircon cores. Metamorphic zircons are all characterized by nebulous zoning or being structureless, with high luminescence and relatively low Th/U values. Metamorphic zircons from two high-pressure mafic granulites yielded 207Pb/206Pb ages of 1956±41Ma and 1884±24Ma. One metamorphic zircon from a garnet-sillimanite gneiss also gave an apparent 207Pb/206Pb age of 1939±15Ma. These results are consistent with interval of ages of c. 1.93-1.90Ga already obtained by previous studies for the North and South Liaohe Groups and the Laoling Group in the northern segment of the Jiao-Liao-Ji Belt. Metamorphic zircons from a high-pressure pelitic granulite and two pelitic gneisses yielded weighted mean 207Pb/206Pb ages of 1837±8Ma, 1821±8Ma and 1836±8Ma respectively. Two diopside-olivine-phlogopite marbles yielded weighted mean 207Pb/206Pb ages of 1817±9Ma and 1790±6Ma. These Paleoproterozoic metamorphic ages are largely in accordance with metamorphic ages of c. 1.85Ga produced from the Ji'an Group in the northern segment of the Jiao-Liao-Ji Belt and c. 1.86-1.80Ga obtained for the high-pressure pelitic granulites from the Jingshan Group in the southern segment. As this metamorphic event was coeval with the emplacement of A-type granites in the Jiao-Liao-Ji Belt and its adjacent areas, it is interpreted as having resulted from a post-orogenic or anorogenic extensional event. © 2010 International Association for Gondwana Research.
Persistent Identifierhttp://hdl.handle.net/10722/139169
ISSN
2015 Impact Factor: 8.743
2015 SCImago Journal Rankings: 4.949
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong RGC GRFHKU7057/08P
Chinese NSFC40730315
40872123
Funding Information:

This study was financially supported by the Hong Kong RGC GRF project (HKU7057/08P) and the Chinese NSFC Grants (40730315 and 40872123). Special thanks are given to Professor Liu Dunyi and his colleagues, Mr Liu Chaohui, Dr. He Yanhong for helping with the SHRIMP dating analysis, Mr Gao Jianfeng for helping with the CL imaging, Professor Guo Jinghui and Mr Liu Fu for helping with the field work and Miss Jean Wong Ping Mei and Mr George Ma Shing Kai for their constructive comments on this paper.

References

 

DC FieldValueLanguage
dc.contributor.authorTam, PYen_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorLiu, Fen_HK
dc.contributor.authorZhou, Xen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorLi, Sen_HK
dc.date.accessioned2011-09-23T05:46:18Z-
dc.date.available2011-09-23T05:46:18Z-
dc.date.issued2011en_HK
dc.identifier.citationGondwana Research, 2011, v. 19 n. 1, p. 150-162en_HK
dc.identifier.issn1342-937Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/139169-
dc.description.abstractThe Paleoproterozoic Jiao-Liao-Ji Belt lies in the Eastern Block of the North China Craton, with its southern segment extending across the Bohai Sea into the Jiaobei massif. High-pressure pelitic and mafic granulites have been recently recognized in the Paleoproterozoic Jingshan Group (Jiaobei massif). New SHRIMP U-Th-Pb geochronology combined with cathodoluminescence (CL) imaging of zircon has been applied to the determination of the timing of the metamorphism of the high-temperature and high-pressure granulites and associated gneisses and marbles. Metamorphic zircons in these high-pressure granulites, gneisses and marbles occur as either single grains or overgrowth (or recrystallization) rims surrounding and truncating oscillatory-zoned magmatic zircon cores. Metamorphic zircons are all characterized by nebulous zoning or being structureless, with high luminescence and relatively low Th/U values. Metamorphic zircons from two high-pressure mafic granulites yielded 207Pb/206Pb ages of 1956±41Ma and 1884±24Ma. One metamorphic zircon from a garnet-sillimanite gneiss also gave an apparent 207Pb/206Pb age of 1939±15Ma. These results are consistent with interval of ages of c. 1.93-1.90Ga already obtained by previous studies for the North and South Liaohe Groups and the Laoling Group in the northern segment of the Jiao-Liao-Ji Belt. Metamorphic zircons from a high-pressure pelitic granulite and two pelitic gneisses yielded weighted mean 207Pb/206Pb ages of 1837±8Ma, 1821±8Ma and 1836±8Ma respectively. Two diopside-olivine-phlogopite marbles yielded weighted mean 207Pb/206Pb ages of 1817±9Ma and 1790±6Ma. These Paleoproterozoic metamorphic ages are largely in accordance with metamorphic ages of c. 1.85Ga produced from the Ji'an Group in the northern segment of the Jiao-Liao-Ji Belt and c. 1.86-1.80Ga obtained for the high-pressure pelitic granulites from the Jingshan Group in the southern segment. As this metamorphic event was coeval with the emplacement of A-type granites in the Jiao-Liao-Ji Belt and its adjacent areas, it is interpreted as having resulted from a post-orogenic or anorogenic extensional event. © 2010 International Association for Gondwana Research.en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcren_HK
dc.relation.ispartofGondwana Researchen_HK
dc.subjectJiao-Liao-Ji Belten_HK
dc.subjectNorth China Cratonen_HK
dc.subjectPaleoproterozoic metamorphismen_HK
dc.subjectSHRIMP U-Th-Pb zircon geochronologyen_HK
dc.titleTiming of metamorphism in the Paleoproterozoic Jiao-Liao-Ji Belt: New SHRIMP U-Pb zircon dating of granulites, gneisses and marbles of the Jiaobei massif in the North China Cratonen_HK
dc.typeArticleen_HK
dc.identifier.emailZhao, G:gzhao@hkucc.hku.hken_HK
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.gr.2010.05.007en_HK
dc.identifier.scopuseid_2-s2.0-78650705003en_HK
dc.identifier.hkuros193876en_US
dc.identifier.hkuros219092-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-78650705003&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume19en_HK
dc.identifier.issue1en_HK
dc.identifier.spage150en_HK
dc.identifier.epage162en_HK
dc.identifier.isiWOS:000286960100012-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridTam, PY=49964607300en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridLiu, F=35334748600en_HK
dc.identifier.scopusauthoridZhou, X=7410090761en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridLi, S=35248444400en_HK

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