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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
Title | Geochronological, geochemical and geothermal constraints on petrogenesis of the Indosinian peraluminous granites in the South China Block: A case study in the Hunan Province |
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Authors | |
Keywords | Geochemistry Indosinian granites South China Block Tectonically crustal thickening Zircon U-Pb geochronology |
Issue Date | 2007 |
Publisher | Elsevier 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? |
Abstract | The 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 Identifier | http://hdl.handle.net/10722/72724 |
ISSN | 2021 Impact Factor: 4.020 2020 SCImago Journal Rankings: 1.899 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
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dc.contributor.author | Wang, Y | en_HK |
dc.contributor.author | Fan, W | en_HK |
dc.contributor.author | Sun, M | en_HK |
dc.contributor.author | Liang, X | en_HK |
dc.contributor.author | Zhang, Y | en_HK |
dc.contributor.author | Peng, T | en_HK |
dc.date.accessioned | 2010-09-06T06:44:31Z | - |
dc.date.available | 2010-09-06T06:44:31Z | - |
dc.date.issued | 2007 | en_HK |
dc.identifier.citation | Lithos, 2007, v. 96 n. 3-4, p. 475-502 | en_HK |
dc.identifier.issn | 0024-4937 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/72724 | - |
dc.description.abstract | The 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.language | eng | en_HK |
dc.publisher | Elsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos | en_HK |
dc.relation.ispartof | Lithos | en_HK |
dc.rights | Lithos. Copyright © Elsevier BV. | en_HK |
dc.subject | Geochemistry | en_HK |
dc.subject | Indosinian granites | en_HK |
dc.subject | South China Block | en_HK |
dc.subject | Tectonically crustal thickening | en_HK |
dc.subject | Zircon U-Pb geochronology | en_HK |
dc.title | 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.type | Article | en_HK |
dc.identifier.openurl | http://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.email | Sun, M:minsun@hku.hk | en_HK |
dc.identifier.authority | Sun, M=rp00780 | en_HK |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.lithos.2006.11.010 | en_HK |
dc.identifier.scopus | eid_2-s2.0-34249709557 | en_HK |
dc.identifier.hkuros | 144186 | en_HK |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-34249709557&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 96 | en_HK |
dc.identifier.issue | 3-4 | en_HK |
dc.identifier.spage | 475 | en_HK |
dc.identifier.epage | 502 | en_HK |
dc.identifier.isi | WOS:000247520400009 | - |
dc.publisher.place | Netherlands | en_HK |
dc.identifier.scopusauthorid | Wang, Y=36496272800 | en_HK |
dc.identifier.scopusauthorid | Fan, W=7401635313 | en_HK |
dc.identifier.scopusauthorid | Sun, M=25932315800 | en_HK |
dc.identifier.scopusauthorid | Liang, X=7401735465 | en_HK |
dc.identifier.scopusauthorid | Zhang, Y=37048183700 | en_HK |
dc.identifier.scopusauthorid | Peng, T=7201447871 | en_HK |
dc.identifier.issnl | 0024-4937 | - |