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Article: Geochronological constraints on the timing of migmatization in the Dabie Shan, East-central China

TitleGeochronological constraints on the timing of migmatization in the Dabie Shan, East-central China
Authors
KeywordsDabie Shan
Geochronology
Migmatization
Issue Date2002
PublisherE Schweizerbart'sche Verlagsbuchhandlung. The Journal's web site is located at http://www.schweizerbart.de/j/ejm/
Citation
European Journal Of Mineralogy, 2002, v. 14 n. 3, p. 513-524 How to Cite?
AbstractCombined isotopic dating techniques reveal a complicated tectonothermal history for the migmatites at Fenghuangguan and Zongluzui in the Northern Dabie Unit (NDU). The zircon U-Pb data indicate that the rocks were migmatized about 131.7 ± 1.1 Ma ago. Two whole-rocks (leucosome and melanosome) and three mineral separates yield an internal Rb-Sr isochron age of 115 ± 2 Ma. The 40Ar/39Ar step-heating analyses for four leucosomes give isochron age of 114 ± 1 Ma and 111 ± 1 Ma for hornblende, 107 ± 0.5 Ma for biotite and 95 ± 2 Ma for K-feldspar. These data indicate that the NDU was uplifted after the migmatization at a cooling rate of 10-12°C/Ma. Biotite 40Ar/39Ar step-heating analyses for a felsic granulite at Huangtuling give an isochron age of 194 ± 2 Ma and a plateau age of 195 ± 2 Ma, suggesting that the granulite facies metamorphism predated the regional migmatization. Decoupling between the Rb-Sr age for biotite and 40Ar/39Ar ages for hornblende is interpreted as recrystallization induced by a fluid action. The migmatization is considered as one result of the extensive thermal event in east China, also resulting in the Yanshanian magmatic activities. The previously published isotopic ages of about 130 Ma for the orthogneisses in the NDU may simply record this thermal event. The Nd and Sr isotopic data indicate the existence of pre-Cretaceous, or even Precambrian rocks in the NDU.
Persistent Identifierhttp://hdl.handle.net/10722/72797
ISSN
2015 Impact Factor: 1.464
2015 SCImago Journal Rankings: 0.878
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWang, JHen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorDeng, SXen_HK
dc.date.accessioned2010-09-06T06:45:11Z-
dc.date.available2010-09-06T06:45:11Z-
dc.date.issued2002en_HK
dc.identifier.citationEuropean Journal Of Mineralogy, 2002, v. 14 n. 3, p. 513-524en_HK
dc.identifier.issn0935-1221en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72797-
dc.description.abstractCombined isotopic dating techniques reveal a complicated tectonothermal history for the migmatites at Fenghuangguan and Zongluzui in the Northern Dabie Unit (NDU). The zircon U-Pb data indicate that the rocks were migmatized about 131.7 ± 1.1 Ma ago. Two whole-rocks (leucosome and melanosome) and three mineral separates yield an internal Rb-Sr isochron age of 115 ± 2 Ma. The 40Ar/39Ar step-heating analyses for four leucosomes give isochron age of 114 ± 1 Ma and 111 ± 1 Ma for hornblende, 107 ± 0.5 Ma for biotite and 95 ± 2 Ma for K-feldspar. These data indicate that the NDU was uplifted after the migmatization at a cooling rate of 10-12°C/Ma. Biotite 40Ar/39Ar step-heating analyses for a felsic granulite at Huangtuling give an isochron age of 194 ± 2 Ma and a plateau age of 195 ± 2 Ma, suggesting that the granulite facies metamorphism predated the regional migmatization. Decoupling between the Rb-Sr age for biotite and 40Ar/39Ar ages for hornblende is interpreted as recrystallization induced by a fluid action. The migmatization is considered as one result of the extensive thermal event in east China, also resulting in the Yanshanian magmatic activities. The previously published isotopic ages of about 130 Ma for the orthogneisses in the NDU may simply record this thermal event. The Nd and Sr isotopic data indicate the existence of pre-Cretaceous, or even Precambrian rocks in the NDU.en_HK
dc.languageengen_HK
dc.publisherE Schweizerbart'sche Verlagsbuchhandlung. The Journal's web site is located at http://www.schweizerbart.de/j/ejm/en_HK
dc.relation.ispartofEuropean Journal of Mineralogyen_HK
dc.subjectDabie Shanen_HK
dc.subjectGeochronologyen_HK
dc.subjectMigmatizationen_HK
dc.titleGeochronological constraints on the timing of migmatization in the Dabie Shan, East-central Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0935-1221&volume=14&spage=513&epage=524&date=2002&atitle=Geochronological+constraints+on+the+timing+of+migmatization+in+the+Dabie+Shan,+East-central+Chinaen_HK
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1127/0935-1221/2002/0014-0513en_HK
dc.identifier.scopuseid_2-s2.0-0036263647en_HK
dc.identifier.hkuros72224en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0036263647&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume14en_HK
dc.identifier.issue3en_HK
dc.identifier.spage513en_HK
dc.identifier.epage524en_HK
dc.identifier.isiWOS:000176072800005-
dc.publisher.placeGermanyen_HK
dc.identifier.scopusauthoridWang, JH=7701333718en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridDeng, SX=7202438029en_HK

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