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Article: Geochemical and Nd-Hf isotopic constraints on the origin of the ~ 1.74-Ga Damiao anorthosite complex, North China Craton

TitleGeochemical and Nd-Hf isotopic constraints on the origin of the ~ 1.74-Ga Damiao anorthosite complex, North China Craton
Authors
KeywordsHigh-Al gabbro
Mangerite
Massif-type anorthosite
North China Craton
Post-collisional magmatism
Proterozoic
Issue Date2009
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2009, v. 113 n. 3-4, p. 673-690 How to Cite?
AbstractThe ~ 1.74-Ga Damiao complex in the North China Craton consists of anorthosite (85%), norite (10%), mangerite (4%) and minor troctolite (< 1%), all of which are cut by gabbroic and ferrodioritic dikes. The complex hosts abundant Fe-Ti-P oxide ores and has an emplacement sequence from anorthosite and norite to Fe-Ti-P oxide ores to mangerite. All of the different lithologies in the complex have similar light rare earth element (LREE)-enriched patterns and Nd isotopic compositions with εNd(t) values mostly within the range of - 5.0 to - 4.0. Average εHf(t) values of zircon are - 4.7 for mangerite and - 5.9 for norite. Plagioclase and clinopyroxene show a continuous range of composition from anorthosite and norite to Fe-Ti-P oxide ores to mangerite, suggesting that these lithologies formed by differentiation from a common parental magma. Gabbroic dikes in the Damiao complex are characterized by high Al2O3 (14.5-17.1 wt.%), Sr (~ 1000 ppm) and Mg#s [100 Mg/(Mg + Fe2+)] = 56-73), similar to the high-Al gabbros parental to the Harp Lake and Laramie anorthosite complexes in North America. The high-Al gabbroic dikes of the Damiao complex may reflect the parental melt from which the complex formed, whereas the ferrodioritic dikes may represent residual melts after anorthosite crystallization from the high-Al gabbroic magma. The high-Al gabbros have incompatible element ratios (Zr/Nb = 14-24; La/Nb = 3.6-4.8), which differ significantly from those of nearby coeval, mantle-derived, mafic dike swarms and volcanic rocks but are similar to those of the lower crust. Their zircon εHf(t) and whole-rock εNd(t) compositions plot along the evolution lines of the ~ 2.5 Ga Archean rocks in the North China Craton, suggesting that the Damiao complex was derived from an ancient lower crust. Exceptionally high temperatures and high-degrees of melting (> 75%) would have been required to form the parental high-Al gabbroic magma from the lower crust. We propose that the crustal rocks were dragged into the upper mantle during amalgamation of the North China Craton, where the ambient temperature was high enough (> 1271 °C at 12 kbar) to cause extensive melting, producing a deep-seated magma chamber. The melt then evolved through polybaric crystallization, producing anorthositic magmas with abundant suspended plagioclase that were finally injected at mid-crustal depth to form the Damiao complex. © 2009 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/129153
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
Funding AgencyGrant Number
National Basic Research Program of China2006CB403502
NSFC40272041
40072061
CAS Oversea Partnership Program
Funding Information:

This study was supported by research grants from the National Basic Research Program of China (Grant 2006CB403502), the NSFC ( No. 40272041 to TPZ and No. 40072061 to MGZ) and CAS Oversea Partnership Program. The authors are grateful to Xiao Fu and Ping Xu for the help with XRF and electron microprobe analyses, respectively, to Jian-Feng Gao for zircon U-Pb and Lu-Hf analyses, and to Peng Peng and Zhi-Yao Ni for field assistance. We thank Prof. Christina YanWang, Prof. Jun-Hong Zhao, Prof. Paul Robinson, Dr. Kwan-Nang Pang and Ms. Yang Yang for helping with the preparation of this manuscript. We are grateful to an anonymous referee, Franco Pirajno and the editor, Andrew Kerr, for their constructive reviews.

References

 

DC FieldValueLanguage
dc.contributor.authorZhao, TPen_HK
dc.contributor.authorChen, Wen_HK
dc.contributor.authorZhou, MFen_HK
dc.date.accessioned2010-12-23T08:33:09Z-
dc.date.available2010-12-23T08:33:09Z-
dc.date.issued2009en_HK
dc.identifier.citationLithos, 2009, v. 113 n. 3-4, p. 673-690en_HK
dc.identifier.issn0024-4937en_HK
dc.identifier.urihttp://hdl.handle.net/10722/129153-
dc.description.abstractThe ~ 1.74-Ga Damiao complex in the North China Craton consists of anorthosite (85%), norite (10%), mangerite (4%) and minor troctolite (< 1%), all of which are cut by gabbroic and ferrodioritic dikes. The complex hosts abundant Fe-Ti-P oxide ores and has an emplacement sequence from anorthosite and norite to Fe-Ti-P oxide ores to mangerite. All of the different lithologies in the complex have similar light rare earth element (LREE)-enriched patterns and Nd isotopic compositions with εNd(t) values mostly within the range of - 5.0 to - 4.0. Average εHf(t) values of zircon are - 4.7 for mangerite and - 5.9 for norite. Plagioclase and clinopyroxene show a continuous range of composition from anorthosite and norite to Fe-Ti-P oxide ores to mangerite, suggesting that these lithologies formed by differentiation from a common parental magma. Gabbroic dikes in the Damiao complex are characterized by high Al2O3 (14.5-17.1 wt.%), Sr (~ 1000 ppm) and Mg#s [100 Mg/(Mg + Fe2+)] = 56-73), similar to the high-Al gabbros parental to the Harp Lake and Laramie anorthosite complexes in North America. The high-Al gabbroic dikes of the Damiao complex may reflect the parental melt from which the complex formed, whereas the ferrodioritic dikes may represent residual melts after anorthosite crystallization from the high-Al gabbroic magma. The high-Al gabbros have incompatible element ratios (Zr/Nb = 14-24; La/Nb = 3.6-4.8), which differ significantly from those of nearby coeval, mantle-derived, mafic dike swarms and volcanic rocks but are similar to those of the lower crust. Their zircon εHf(t) and whole-rock εNd(t) compositions plot along the evolution lines of the ~ 2.5 Ga Archean rocks in the North China Craton, suggesting that the Damiao complex was derived from an ancient lower crust. Exceptionally high temperatures and high-degrees of melting (> 75%) would have been required to form the parental high-Al gabbroic magma from the lower crust. We propose that the crustal rocks were dragged into the upper mantle during amalgamation of the North China Craton, where the ambient temperature was high enough (> 1271 °C at 12 kbar) to cause extensive melting, producing a deep-seated magma chamber. The melt then evolved through polybaric crystallization, producing anorthositic magmas with abundant suspended plagioclase that were finally injected at mid-crustal depth to form the Damiao complex. © 2009 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithosen_HK
dc.relation.ispartofLithosen_HK
dc.subjectHigh-Al gabbroen_HK
dc.subjectMangeriteen_HK
dc.subjectMassif-type anorthositeen_HK
dc.subjectNorth China Cratonen_HK
dc.subjectPost-collisional magmatismen_HK
dc.subjectProterozoicen_HK
dc.titleGeochemical and Nd-Hf isotopic constraints on the origin of the ~ 1.74-Ga Damiao anorthosite complex, North China Cratonen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0024-4937&volume=113&issue=3-4&spage=673–690&epage=&date=2009&atitle=Geochemical+and+Nd-Hf+isotopic+constraints+on+the+origin+of+the++1.74-Ga+Damiao+anorthosite+complex,+North+China+Craton-
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.lithos.2009.07.002en_HK
dc.identifier.scopuseid_2-s2.0-70449089111en_HK
dc.identifier.hkuros177706en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-70449089111&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume113en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage673en_HK
dc.identifier.epage690en_HK
dc.identifier.isiWOS:000272787200022-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridZhao, TP=35730612500en_HK
dc.identifier.scopusauthoridChen, W=36012609700en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.citeulike5331980-

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