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Article: U-Pb and Hf isotopic study of zircons of the Helanshan Complex: Constrains on the evolution of the Khondalite Belt in the Western Block of the North China Craton

TitleU-Pb and Hf isotopic study of zircons of the Helanshan Complex: Constrains on the evolution of the Khondalite Belt in the Western Block of the North China Craton
Authors
KeywordsCrustal evolution
Hf isotope
Khondalite Belt
North China Craton
Palaeoproterozoic
U-Pb age
Issue Date2011
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2011, v. 122 n. 1-2, p. 25-38 How to Cite?
AbstractThe Helanshan Complex is located at the westernmost segment of the Khondalite Belt, a continent-continent collisional belt along which the Yinshan Block in the north collided with the Ordos Block in the south to form the Western Block of the North China Craton. The complex consists of S-type granites and high-grade pelitic granulite/gneiss, felsic paragneiss, quartzite, calc-silicate rock and marble, together called the Khondalite Series rocks. LA-Q-ICP-MS U-Pb geochronology and LA-MC-ICP-MS Lu-Hf isotopic data of zircons, combined with cathodoluminescence (CL) imaging, enable the resolution of magmatic and metamorphic events that can be directed towards understanding the formation and evolution of the Khondalite Belt in the Western Block of the North China Craton. CL images reveal the coexistence of magmatic-type detrital zircons and metamorphic zircons in most of the Khondalite Series rocks, of which the metamorphic zircons occur as either single grains or overgrowth rims surrounding and truncating magmatic-type detrital zircon cores. LA-Q-ICP-MS U-Pb analyses on magmatic-type detrital zircons reveal two distinct age populations, with one in the Archaean (2.85-2.53Ga) and the other in the Palaeoproterozoic (2.2-2.0Ga), suggesting that the sedimentary protoliths of the Khondalite Series rocks in the Helanshan Complex must have been deposited at some time after 2.0Ga. The Hf analyses show that the Archaean detrital zircons possess negative Ε Hf(t) values from -7.64 to -0.15 with depleted mantle model ages ranging from 3.34 to 3.10Ga. This implies the existence of a Paleo-Mesoarchaean (3.34-3.10Ga) crust in the Western Block, which underwent a recycling event in the period 2.85-2.53Ga. Nearly all Palaeoproterozoic (2.2-2.0Ga) detrital zircons possess positive Ε Hf(t) values (0.86-9.38) with depleted mantle model ages of 2.45-2.15Ga, suggesting a significant crustal growth event in the Western Block in the Palaeoproterozoic. Metamorphic zircons yield two groups of age, with one at ~1.95Ga and the other at ~1.87Ga, of which the former is considered as the timing of the collision between the Yinshan and Ordos Blocks to form the Western Block, whereas the latter is consistent with the age of ~1.86Ga from two S-type granites which are considered to have formed by the partial melting of pelitic granulites/gneisses at the stage of the exhumation of the Helanshan Complex. © 2010 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/139164
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
Funding AgencyGrant Number
Chinese National 973 Program2007CB411307
Chinese NSFC40730315
40872123
40872122
Hong Kong RGC7066/07P
7053/08P
Funding Information:

This research was funded by the Chinese National 973 Program (2007CB411307), Chinese NSFC Grants (40730315, 40872123 and 40872122), and Hong Kong RGC grants (7066/07P and 7053/08P). Liewen Xie, Yueheng Yang, Fu Liu and other lab assistants from the MC-LA-ICP-MS Lab are thanked. Comments from two anonymous reviewers and journal editor Prof. Ian Buick have improved the manuscript. A HKU studentship to Changqing Yin is greatly acknowledged.

References

 

DC FieldValueLanguage
dc.contributor.authorYin, Cen_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorGuo, Jen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorXia, Xen_HK
dc.contributor.authorZhou, Xen_HK
dc.contributor.authorLiu, Cen_HK
dc.date.accessioned2011-09-23T05:46:15Z-
dc.date.available2011-09-23T05:46:15Z-
dc.date.issued2011en_HK
dc.identifier.citationLithos, 2011, v. 122 n. 1-2, p. 25-38en_HK
dc.identifier.issn0024-4937en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139164-
dc.description.abstractThe Helanshan Complex is located at the westernmost segment of the Khondalite Belt, a continent-continent collisional belt along which the Yinshan Block in the north collided with the Ordos Block in the south to form the Western Block of the North China Craton. The complex consists of S-type granites and high-grade pelitic granulite/gneiss, felsic paragneiss, quartzite, calc-silicate rock and marble, together called the Khondalite Series rocks. LA-Q-ICP-MS U-Pb geochronology and LA-MC-ICP-MS Lu-Hf isotopic data of zircons, combined with cathodoluminescence (CL) imaging, enable the resolution of magmatic and metamorphic events that can be directed towards understanding the formation and evolution of the Khondalite Belt in the Western Block of the North China Craton. CL images reveal the coexistence of magmatic-type detrital zircons and metamorphic zircons in most of the Khondalite Series rocks, of which the metamorphic zircons occur as either single grains or overgrowth rims surrounding and truncating magmatic-type detrital zircon cores. LA-Q-ICP-MS U-Pb analyses on magmatic-type detrital zircons reveal two distinct age populations, with one in the Archaean (2.85-2.53Ga) and the other in the Palaeoproterozoic (2.2-2.0Ga), suggesting that the sedimentary protoliths of the Khondalite Series rocks in the Helanshan Complex must have been deposited at some time after 2.0Ga. The Hf analyses show that the Archaean detrital zircons possess negative Ε Hf(t) values from -7.64 to -0.15 with depleted mantle model ages ranging from 3.34 to 3.10Ga. This implies the existence of a Paleo-Mesoarchaean (3.34-3.10Ga) crust in the Western Block, which underwent a recycling event in the period 2.85-2.53Ga. Nearly all Palaeoproterozoic (2.2-2.0Ga) detrital zircons possess positive Ε Hf(t) values (0.86-9.38) with depleted mantle model ages of 2.45-2.15Ga, suggesting a significant crustal growth event in the Western Block in the Palaeoproterozoic. Metamorphic zircons yield two groups of age, with one at ~1.95Ga and the other at ~1.87Ga, of which the former is considered as the timing of the collision between the Yinshan and Ordos Blocks to form the Western Block, whereas the latter is consistent with the age of ~1.86Ga from two S-type granites which are considered to have formed by the partial melting of pelitic granulites/gneisses at the stage of the exhumation of the Helanshan Complex. © 2010 Elsevier B.V.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.subjectCrustal evolutionen_HK
dc.subjectHf isotopeen_HK
dc.subjectKhondalite Belten_HK
dc.subjectNorth China Cratonen_HK
dc.subjectPalaeoproterozoicen_HK
dc.subjectU-Pb ageen_HK
dc.titleU-Pb and Hf isotopic study of zircons of the Helanshan Complex: Constrains on the evolution of the Khondalite Belt in the Western Block of the North China Cratonen_HK
dc.typeArticleen_HK
dc.identifier.emailZhao, G: gzhao@hkucc.hku.hken_HK
dc.identifier.emailSun, M: minsun@hku.hken_HK
dc.identifier.emailXia, X: xpxia@hotmail.comen_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.identifier.authorityXia, X=rp00815en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.lithos.2010.11.010en_HK
dc.identifier.scopuseid_2-s2.0-78751703301en_HK
dc.identifier.hkuros193871en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-78751703301&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume122en_HK
dc.identifier.issue1-2en_HK
dc.identifier.spage25en_HK
dc.identifier.epage38en_HK
dc.identifier.isiWOS:000287347100003-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridYin, C=16053843700en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridGuo, J=49963614900en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridXia, X=35241486400en_HK
dc.identifier.scopusauthoridZhou, X=7410090761en_HK
dc.identifier.scopusauthoridLiu, C=36955394800en_HK
dc.identifier.citeulike8402543-

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