File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Geochronological, geochemical and geothermal constraints on petrogenesis of the Indosinian peraluminous granites in the South China Block: A case study in the Hunan Province

TitleGeochronological, geochemical and geothermal constraints on petrogenesis of the Indosinian peraluminous granites in the South China Block: A case study in the Hunan Province
Authors
KeywordsGeochemistry
Indosinian granites
South China Block
Tectonically crustal thickening
Zircon U-Pb geochronology
Issue Date2007
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2007, v. 96 n. 3-4, p. 475-502 How to Cite?
AbstractThe Indosinian granites in the South China Block (SCB) have important tectonic significance for the evolution of East Asia. Samples collected from Hunan Province can be geochemically classified into two groups. Group 1 is strongly peraluminous (A/CNK > 1.1), similar to S-type granites, and Group 2 has A/CNK = 1.0-1.1, with an affinity to I-type granites. Group 1 has lower FeOt, Al 2O 3, MgO, CaO, TiO 2 and ε Nd(t) values but higher K 2O + Na 2O, Rb/Sr, Rb/Ba and 87Sr/ 86Sr(t) than those of Group 2. Samples of both groups have similar LREE enriched pattern, with (Eu/Eu *) = 0.19-0.69, and strongly negative Ba, Sr, Nb, P and Ti anomalies. Geothermobarometry study indicates that the precursor magmas were emplaced at high-level depth with relatively low temperature (734-827 °C). Geochemical data suggest that Group 1 was originated from a source dominated by pelitic composition and Group 2 was from a mixing source of pelitic and basaltic rocks with insignificant addition of newly mantle-derived magma. Eight granitic samples in Hunan Province are dated at the cluster of 243-235 and 218-210 Ma by zircon U-Pb geochronology. Together with recent zircon U-Pb ages for other areas in the SCB, two age-clusters, including 243-228 Ma just after peak-metamorphism (∼ 246-252 Ma) and 220-206 Ma shortly after magma underplating event (∼224 Ma), are observed. It is proposed that in-situ radiogenic heating from the over-thickened crust induced dehydrated reaction of muscovite and epidote/zoisite to form the early Indosinian granites in response to the isostatic readjustments of tectonically thickened crust. Conductive heating from the underplating magma in the postcollisional setting triggered the formation of late Indosinian granites. Such a consideration is supported by the results from FLAC numerical simulation. © 2006 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72724
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWang, Yen_HK
dc.contributor.authorFan, Wen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorLiang, Xen_HK
dc.contributor.authorZhang, Yen_HK
dc.contributor.authorPeng, Ten_HK
dc.date.accessioned2010-09-06T06:44:31Z-
dc.date.available2010-09-06T06:44:31Z-
dc.date.issued2007en_HK
dc.identifier.citationLithos, 2007, v. 96 n. 3-4, p. 475-502en_HK
dc.identifier.issn0024-4937en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72724-
dc.description.abstractThe Indosinian granites in the South China Block (SCB) have important tectonic significance for the evolution of East Asia. Samples collected from Hunan Province can be geochemically classified into two groups. Group 1 is strongly peraluminous (A/CNK > 1.1), similar to S-type granites, and Group 2 has A/CNK = 1.0-1.1, with an affinity to I-type granites. Group 1 has lower FeOt, Al 2O 3, MgO, CaO, TiO 2 and ε Nd(t) values but higher K 2O + Na 2O, Rb/Sr, Rb/Ba and 87Sr/ 86Sr(t) than those of Group 2. Samples of both groups have similar LREE enriched pattern, with (Eu/Eu *) = 0.19-0.69, and strongly negative Ba, Sr, Nb, P and Ti anomalies. Geothermobarometry study indicates that the precursor magmas were emplaced at high-level depth with relatively low temperature (734-827 °C). Geochemical data suggest that Group 1 was originated from a source dominated by pelitic composition and Group 2 was from a mixing source of pelitic and basaltic rocks with insignificant addition of newly mantle-derived magma. Eight granitic samples in Hunan Province are dated at the cluster of 243-235 and 218-210 Ma by zircon U-Pb geochronology. Together with recent zircon U-Pb ages for other areas in the SCB, two age-clusters, including 243-228 Ma just after peak-metamorphism (∼ 246-252 Ma) and 220-206 Ma shortly after magma underplating event (∼224 Ma), are observed. It is proposed that in-situ radiogenic heating from the over-thickened crust induced dehydrated reaction of muscovite and epidote/zoisite to form the early Indosinian granites in response to the isostatic readjustments of tectonically thickened crust. Conductive heating from the underplating magma in the postcollisional setting triggered the formation of late Indosinian granites. Such a consideration is supported by the results from FLAC numerical simulation. © 2006 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithosen_HK
dc.relation.ispartofLithosen_HK
dc.rightsLithos. Copyright © Elsevier BV.en_HK
dc.subjectGeochemistryen_HK
dc.subjectIndosinian granitesen_HK
dc.subjectSouth China Blocken_HK
dc.subjectTectonically crustal thickeningen_HK
dc.subjectZircon U-Pb geochronologyen_HK
dc.titleGeochronological, geochemical and geothermal constraints on petrogenesis of the Indosinian peraluminous granites in the South China Block: A case study in the Hunan Provinceen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0024-4937&volume=96&spage=475&epage=502&date=2007&atitle=Geochronological,+geochemical+and+geothermal+constraints+on+petrogenesis+of+the+Indosinian+peraluminous+granites+in+the+South+China+Block:+A+case+study+in+the+Hunan+Province.+en_HK
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.lithos.2006.11.010en_HK
dc.identifier.scopuseid_2-s2.0-34249709557en_HK
dc.identifier.hkuros144186en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34249709557&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume96en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage475en_HK
dc.identifier.epage502en_HK
dc.identifier.isiWOS:000247520400009-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridWang, Y=36496272800en_HK
dc.identifier.scopusauthoridFan, W=7401635313en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridLiang, X=7401735465en_HK
dc.identifier.scopusauthoridZhang, Y=37048183700en_HK
dc.identifier.scopusauthoridPeng, T=7201447871en_HK

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats