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Article: Geochemical constraints on the tectonic setting of Paleoproterozoic A-type granites in the southern margin of the North China Craton

TitleGeochemical constraints on the tectonic setting of Paleoproterozoic A-type granites in the southern margin of the North China Craton
Authors
KeywordsA-type granite
North China Craton
Paleoproterozoic
Post-orogenic extension
SHRIMP zircon dating
Sr-Nd-Pb-Hf isotopes
Issue Date2009
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaes
Citation
Journal Of Asian Earth Sciences, 2009, v. 36 n. 2-3, p. 183-195 How to Cite?
AbstractThe amalgamation of the Eastern and Western Blocks of the North China Craton (NCC) at ∼1.85 Ga resulted in the formation of the Central Zone between the two. Post-orogenic A-type granites in the NCC provide constraints on the timing of this collisional event. The Shicheng and Motianzhai granitic plutons in the Songshan district of the southern NCC have SHRIMP zircon U-Pb ages of 1743 ± 14 Ma and 1797 ± 14 Ma, respectively. Both plutons consist of biotite granite and granodiorite with total alkalis (K2O + Na2O) ranging from 7.65 to 9.12 wt.%. High Fe*(FeOt/FeOt + MgO) (0.79-0.90) and 10,000×Ga/Al ratios (2.19-3.26), indicate that these are A-type granites formed in a post-collisional environment. Whole-rock εNd(t) values range from -5.7 to -7.8 and TDM model ages from 2.60 to 2.93 Ga. Zircons from these granites have εHf(t) values ranging from -5.3 to -13.5, corresponding to two stage model ages (TDM C) of 2.85-3.29 Ga. These isotopic features suggest that the rocks were derived from the late Archean basement complexes. The A-type granites in Songshan are different from typical granitic rocks formed in anorogenic intra-continental rifts, but resemble those emplaced in post-orogenic extensional tectonic settings. Based on the criteria of Eby (1992), the Songshan A-type granites belong to the A2 (post-orogenic) type. This post-orogenic extensional event occurred after a major orogeny that formed the Central Zone at ca. 1.85 Ga and lasted for more than 50 myr. © 2009 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72480
ISSN
2015 Impact Factor: 2.647
2015 SCImago Journal Rankings: 1.393
ISI Accession Number ID
Funding AgencyGrant Number
National Basic Research Program of China2006CB403502
National Natural Science Foundation of China40672058
State Key Laboratory of Ore Deposit Geochemistry
Institute of Geochemistry
Chinese Academy of Sciences200802
Funding Information:

This study was supported by the National Basic Research Program of China (Grant 2006CB403502), the National Natural Science Foundation of China (No. 40672058) and the State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences (200802). We thank Fu Xiao and Jian-Feng Gao of the University of Hong Kong for XRF and ICP-MS analyses, Liang-Wei Xue for field assistance, Wei Chen, Wei-Hua Sun, Jun-Hong Zhao, Xin-Fu Zhao and Yan-Yan Zhou for helping with the preparation of this manuscript and Paul T. Robinson for proofreading earlier drafts of this paper. We are grateful to the anonymous referee, Bernard Bonin and Bor-Ming Jahn for their constructive reviews that substantially improved the presentation of this paper.

References

 

DC FieldValueLanguage
dc.contributor.authorZhao, TPen_HK
dc.contributor.authorZhou, MFen_HK
dc.date.accessioned2010-09-06T06:42:14Z-
dc.date.available2010-09-06T06:42:14Z-
dc.date.issued2009en_HK
dc.identifier.citationJournal Of Asian Earth Sciences, 2009, v. 36 n. 2-3, p. 183-195en_HK
dc.identifier.issn1367-9120en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72480-
dc.description.abstractThe amalgamation of the Eastern and Western Blocks of the North China Craton (NCC) at ∼1.85 Ga resulted in the formation of the Central Zone between the two. Post-orogenic A-type granites in the NCC provide constraints on the timing of this collisional event. The Shicheng and Motianzhai granitic plutons in the Songshan district of the southern NCC have SHRIMP zircon U-Pb ages of 1743 ± 14 Ma and 1797 ± 14 Ma, respectively. Both plutons consist of biotite granite and granodiorite with total alkalis (K2O + Na2O) ranging from 7.65 to 9.12 wt.%. High Fe*(FeOt/FeOt + MgO) (0.79-0.90) and 10,000×Ga/Al ratios (2.19-3.26), indicate that these are A-type granites formed in a post-collisional environment. Whole-rock εNd(t) values range from -5.7 to -7.8 and TDM model ages from 2.60 to 2.93 Ga. Zircons from these granites have εHf(t) values ranging from -5.3 to -13.5, corresponding to two stage model ages (TDM C) of 2.85-3.29 Ga. These isotopic features suggest that the rocks were derived from the late Archean basement complexes. The A-type granites in Songshan are different from typical granitic rocks formed in anorogenic intra-continental rifts, but resemble those emplaced in post-orogenic extensional tectonic settings. Based on the criteria of Eby (1992), the Songshan A-type granites belong to the A2 (post-orogenic) type. This post-orogenic extensional event occurred after a major orogeny that formed the Central Zone at ca. 1.85 Ga and lasted for more than 50 myr. © 2009 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
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.subjectA-type graniteen_HK
dc.subjectNorth China Cratonen_HK
dc.subjectPaleoproterozoicen_HK
dc.subjectPost-orogenic extensionen_HK
dc.subjectSHRIMP zircon datingen_HK
dc.subjectSr-Nd-Pb-Hf isotopesen_HK
dc.titleGeochemical constraints on the tectonic setting of Paleoproterozoic A-type granites in the southern margin of the North China Cratonen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1367-9120&volume=36&issue=2-3&spage=183&epage=195&date=2009&atitle=Geochemical+constraints+on+the+tectonic+setting+of+Paleoproterozoic+A-type+granites+in+the+southern+margin+of+the+North+China+Cratonen_HK
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jseaes.2009.05.005en_HK
dc.identifier.scopuseid_2-s2.0-67650976350en_HK
dc.identifier.hkuros167082en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-67650976350&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume36en_HK
dc.identifier.issue2-3en_HK
dc.identifier.spage183en_HK
dc.identifier.epage195en_HK
dc.identifier.isiWOS:000269269600005-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridZhao, TP=35730612500en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.citeulike5369577-

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