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Article: Sm-Nd and SHRIMP U-Pb zircon geochronology of high-pressure granulites in the Sanggan area, North China Craton: Timing of Paleoproterozoic continental collision

TitleSm-Nd and SHRIMP U-Pb zircon geochronology of high-pressure granulites in the Sanggan area, North China Craton: Timing of Paleoproterozoic continental collision
Authors
KeywordsHigh-Pressure Granulite
North China Craton
Paleoproterozoic
Shrimp U-Pb Zircon Geochronology
Sm-Nd Ages
Issue Date2005
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaes
Citation
Journal Of Asian Earth Sciences, 2005, v. 24 n. 5 SPEC. ISS., p. 629-642 How to Cite?
AbstractHigh-pressure (HP) mafic granulites are widely distributed as sheet-like and lenticular bodies within highly deformed tonalitic gneisses in the Sanggan area, North China Craton. They have clockwise isothermal decompression and isobaric cooling P-T paths implying continental collision tectonics. Whole-rock analyses of 15 samples define a Sm-Nd isochron yielding an age of 2547 ± 87 Ma with ε Nd(t)=2.7. Corresponding Nd depleted mantle model ages show a similar range and are interpreted as the age of the magmatic protolith to the high-pressure granulites. A combined Sm-Nd mineral+whole-rock isochron from one of these samples yields an age of 1813 ± 23 Ma, taken to represent the metamorphic age at an early stage on the cooling path. SHRIMP U-Pb zircon analyses of three HP mafic granulite samples give uniform weighted mean 207Pb/ 206Pb ages of 1817 ± 12, 1817 ± 12 and 1819 ± 16 Ma. These ages are interpreted to date metamorphism of the HP granulites and, with the Sm-Nd mineral + whole-rock result, strongly suggest that the time of continental collision was at ca.1.82 Ga. An additional sample records two age populations; one at 1803 ± 9 Ma and an older one at 1872 ± 16 Ma. The latter may indicate the timing of either an earlier metamorphic event or possibly the earliest stage of a single prolonged metamorphic episode that peaked at ∼1.82 Ga. These results confirm the Paleoproterozoic age for assembly of the North China Craton. © 2004 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151140
ISSN
2015 Impact Factor: 2.647
2015 SCImago Journal Rankings: 1.393
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorGuo, JHen_US
dc.contributor.authorSun, Men_US
dc.contributor.authorChen, FKen_US
dc.contributor.authorZhai, MGen_US
dc.date.accessioned2012-06-26T06:17:35Z-
dc.date.available2012-06-26T06:17:35Z-
dc.date.issued2005en_US
dc.identifier.citationJournal Of Asian Earth Sciences, 2005, v. 24 n. 5 SPEC. ISS., p. 629-642en_US
dc.identifier.issn1367-9120en_US
dc.identifier.urihttp://hdl.handle.net/10722/151140-
dc.description.abstractHigh-pressure (HP) mafic granulites are widely distributed as sheet-like and lenticular bodies within highly deformed tonalitic gneisses in the Sanggan area, North China Craton. They have clockwise isothermal decompression and isobaric cooling P-T paths implying continental collision tectonics. Whole-rock analyses of 15 samples define a Sm-Nd isochron yielding an age of 2547 ± 87 Ma with ε Nd(t)=2.7. Corresponding Nd depleted mantle model ages show a similar range and are interpreted as the age of the magmatic protolith to the high-pressure granulites. A combined Sm-Nd mineral+whole-rock isochron from one of these samples yields an age of 1813 ± 23 Ma, taken to represent the metamorphic age at an early stage on the cooling path. SHRIMP U-Pb zircon analyses of three HP mafic granulite samples give uniform weighted mean 207Pb/ 206Pb ages of 1817 ± 12, 1817 ± 12 and 1819 ± 16 Ma. These ages are interpreted to date metamorphism of the HP granulites and, with the Sm-Nd mineral + whole-rock result, strongly suggest that the time of continental collision was at ca.1.82 Ga. An additional sample records two age populations; one at 1803 ± 9 Ma and an older one at 1872 ± 16 Ma. The latter may indicate the timing of either an earlier metamorphic event or possibly the earliest stage of a single prolonged metamorphic episode that peaked at ∼1.82 Ga. These results confirm the Paleoproterozoic age for assembly of the North China Craton. © 2004 Elsevier Ltd. All rights reserved.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaesen_US
dc.relation.ispartofJournal of Asian Earth Sciencesen_US
dc.subjectHigh-Pressure Granuliteen_US
dc.subjectNorth China Cratonen_US
dc.subjectPaleoproterozoicen_US
dc.subjectShrimp U-Pb Zircon Geochronologyen_US
dc.subjectSm-Nd Agesen_US
dc.titleSm-Nd and SHRIMP U-Pb zircon geochronology of high-pressure granulites in the Sanggan area, North China Craton: Timing of Paleoproterozoic continental collisionen_US
dc.typeArticleen_US
dc.identifier.emailSun, M:minsun@hku.hken_US
dc.identifier.authoritySun, M=rp00780en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.jseaes.2004.01.017en_US
dc.identifier.scopuseid_2-s2.0-14944356730en_US
dc.identifier.hkuros127650-
dc.identifier.hkuros108591-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-14944356730&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume24en_US
dc.identifier.issue5 SPEC. ISS.en_US
dc.identifier.spage629en_US
dc.identifier.epage642en_US
dc.identifier.isiWOS:000228247800008-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridGuo, JH=36623632200en_US
dc.identifier.scopusauthoridSun, M=25932315800en_US
dc.identifier.scopusauthoridChen, FK=7404907137en_US
dc.identifier.scopusauthoridZhai, MG=35910309500en_US

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