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Article: Geochronological and Geochemical study of Palaeoproterozoic gneissic granites and clinopyroxenite xenoliths from NW Fujian, SE China: Implications for the crustal evolution of the Cathaysia Block

TitleGeochronological and Geochemical study of Palaeoproterozoic gneissic granites and clinopyroxenite xenoliths from NW Fujian, SE China: Implications for the crustal evolution of the Cathaysia Block
Authors
KeywordsCathaysia Block
Clinopyroxenites
Gneissic granites
Hf isotopes
Palaeoproterozoic tectono-thermal event
Zircon geochronology
Issue Date2011
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaes
Citation
Journal Of Asian Earth Sciences, 2011, v. 41 n. 2, p. 204-212 How to Cite?
AbstractU-Pb zircon dating of gneissic granite samples in northwestern Fujian Province, Southeast China, gave Neoarchean to Palaeoproterozoic ages (2.6-1.9Ga) for the rounded zircon cores and Palaeoproterozoic upper intercept ages (1851±21Ma, 1857±29Ma, respectively) for zoned rims that have oscillatory growth zoning and yield εHf(t) values between -8.8 and +3.7 and TDM model ages between 2.1 and 2.6Ga. These gneissic granites are peraluminous (A/CNK=0.94-1.28), characterized by high SiO2 (68-72wt.%), Al2O3 (14-15wt.%) and low CaO, MgO, FeOt, TiO2 and P2O5 contents. They also possess relatively low REE contents and moderate LREE/HREE fractionation and display pronounced negative anomalies in Nb, Ta, Sr, P and Ti. All these features indicate that the precursor magmas were likely formed by partial melting of sedimentary rocks.Clinopyroxenite xenoliths with gneissosity structures are found in these gneissic granites and they have high MgO, Ni and Cr, but low contents of TiO2, and are characterized by high CaO/Al2O3 (4.1-5.3), low Al2O3/TiO2 ratios (8.7-9.5) and HREE depletion. These features are similar to the typical Al-depleted type komatiites. Their geochemical characteristics, such as high (Gd/Yb)N and low HREE, Y, Zr and Hf suggest partial melting of the upper mantle source with residual garnet. The negative Nb, Ta and Ti anomalies indicate a strong arc-related affinity.Our results and recently published data for granitic and mafic basement rocks in this region, reveal that 1.85. Ga was an important period for the evolution of the Cathaysia Block, possibly related to the Columbia supercontinent assembly. Large amount of granitic magma was emplaced, probably as a result of partial melting of old Neoarchean to Palaeoproterozoic materials. © 2011 Elsevier Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/139180
ISSN
2015 Impact Factor: 2.647
2015 SCImago Journal Rankings: 1.393
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong Research Grant CouncilHKU 7041/05
Guangzhou Institute of Geochemistry, CAS
Chinese Ministry of Land and Resources200811015
Funding Information:

The authors appreciate the assistance of X.P. Xia and X. Fu in ICP-MS and XRF analyses, M.N. Dai for Hf analysis. J.F. Gao, Y.H. He and S.H. Yang are thanked for their helpful discussion and A.M. Zhang and F.F. Zhang for help in the field. We thank Prof. M. Santosh and Dr. J.G. Shellnutt for their comments that helped the improvement of the paper. This study was financially supported by research grants from the Hong Kong Research Grant Council (HKU 7041/05), the Croucher Funding for the Joint Laboratory between HKU and Guangzhou Institute of Geochemistry, CAS and the Chinese Ministry of Land and Resources (200811015). A HKU postgraduate studentship to Longming Li is gratefully acknowledged.

References

 

DC FieldValueLanguage
dc.contributor.authorLi, LMen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorWang, Yen_HK
dc.contributor.authorXing, Gen_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorCai, Ken_HK
dc.contributor.authorZhang, Yen_HK
dc.date.accessioned2011-09-23T05:46:23Z-
dc.date.available2011-09-23T05:46:23Z-
dc.date.issued2011en_HK
dc.identifier.citationJournal Of Asian Earth Sciences, 2011, v. 41 n. 2, p. 204-212en_HK
dc.identifier.issn1367-9120en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139180-
dc.description.abstractU-Pb zircon dating of gneissic granite samples in northwestern Fujian Province, Southeast China, gave Neoarchean to Palaeoproterozoic ages (2.6-1.9Ga) for the rounded zircon cores and Palaeoproterozoic upper intercept ages (1851±21Ma, 1857±29Ma, respectively) for zoned rims that have oscillatory growth zoning and yield εHf(t) values between -8.8 and +3.7 and TDM model ages between 2.1 and 2.6Ga. These gneissic granites are peraluminous (A/CNK=0.94-1.28), characterized by high SiO2 (68-72wt.%), Al2O3 (14-15wt.%) and low CaO, MgO, FeOt, TiO2 and P2O5 contents. They also possess relatively low REE contents and moderate LREE/HREE fractionation and display pronounced negative anomalies in Nb, Ta, Sr, P and Ti. All these features indicate that the precursor magmas were likely formed by partial melting of sedimentary rocks.Clinopyroxenite xenoliths with gneissosity structures are found in these gneissic granites and they have high MgO, Ni and Cr, but low contents of TiO2, and are characterized by high CaO/Al2O3 (4.1-5.3), low Al2O3/TiO2 ratios (8.7-9.5) and HREE depletion. These features are similar to the typical Al-depleted type komatiites. Their geochemical characteristics, such as high (Gd/Yb)N and low HREE, Y, Zr and Hf suggest partial melting of the upper mantle source with residual garnet. The negative Nb, Ta and Ti anomalies indicate a strong arc-related affinity.Our results and recently published data for granitic and mafic basement rocks in this region, reveal that 1.85. Ga was an important period for the evolution of the Cathaysia Block, possibly related to the Columbia supercontinent assembly. Large amount of granitic magma was emplaced, probably as a result of partial melting of old Neoarchean to Palaeoproterozoic materials. © 2011 Elsevier Ltd.en_HK
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaesen_HK
dc.relation.ispartofJournal of Asian Earth Sciencesen_HK
dc.subjectCathaysia Blocken_HK
dc.subjectClinopyroxenitesen_HK
dc.subjectGneissic granitesen_HK
dc.subjectHf isotopesen_HK
dc.subjectPalaeoproterozoic tectono-thermal eventen_HK
dc.subjectZircon geochronologyen_HK
dc.titleGeochronological and Geochemical study of Palaeoproterozoic gneissic granites and clinopyroxenite xenoliths from NW Fujian, SE China: Implications for the crustal evolution of the Cathaysia Blocken_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1367-9120&volume=41&issue=2&spage=204&epage=212&date=2011&atitle=Geochronological+and+Geochemical+study+of+Palaeoproterozoic+gneissic+granites+and+clinopyroxenite+xenoliths+from+NW+Fujian,+SE+China:+implications+for+the+crustal+evolution+of+the+Cathaysia+Block-
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.emailZhao, G:gzhao@hkucc.hku.hken_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jseaes.2011.01.017en_HK
dc.identifier.scopuseid_2-s2.0-79953162573en_HK
dc.identifier.hkuros193902en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79953162573&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume41en_HK
dc.identifier.issue2en_HK
dc.identifier.spage204en_HK
dc.identifier.epage212en_HK
dc.identifier.isiWOS:000290602700008-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLi, LM=49963916100en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridWang, Y=36496272800en_HK
dc.identifier.scopusauthoridXing, G=7103115605en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridCai, K=14011943800en_HK
dc.identifier.scopusauthoridZhang, Y=7601316316en_HK
dc.identifier.citeulike8796311-

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