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Article: SHRIMP U-Pb zircon geochronology of the Huai'an Complex: Constraints on Late Archean to Paleoproterozoic magmatic and metamorphic events in the Trans-North China Orogen

TitleSHRIMP U-Pb zircon geochronology of the Huai'an Complex: Constraints on Late Archean to Paleoproterozoic magmatic and metamorphic events in the Trans-North China Orogen
Authors
KeywordsArchean
Granulite
Magmatism
Proterozoic
North China block
Issue Date2008
PublisherAmerican Journal of Science. The Journal's web site is located at http://www.ajsonline.org
Citation
American Journal Of Science, 2008, v. 308 n. 3, p. 270-303 How to Cite?
AbstractThe Huai'an Complex is situated in the northern segment of the Trans-North China Orogen (TNCO), a continent-continent collisional belt along which the discrete Archean Eastern and Western Blocks amalgamated to form the basement of the North China Craton. The complex consists of six distinct lithologic units: the Huai'an TTG gneisses, the Manjinggou high-pressure mafic granulites, the Khondalite Series, the Dongjiagou granitic gneiss, the Huai'an charnockite, and the Dapinggou K-feldspar granite. SHRIMP U-Pb geochronology, combined with Th and U data and cathodoluminescence (CL) imaging of zircons, enables resolution of magmatic and metamorphic events that can be directed towards understanding the late Archean to Paleoproterozoic history of the TNCO. CL images reveal the coexistence of magmatic and metamorphic zircons in most lithologies of the Huai'an Complex, of which the metamorphic zircons occur as either single grains or overgrowth rims surrounding and truncating oscillatory-zoned magmatic zircon cores. SHRIMP U-Pb analyses on magmatic zircons reveal that the tonalitic, trondhjemitic and granodioritic protoliths of the Huai'an TTG gneisses were emplaced at 2515 ± 20 Ma, 2499 ± 19 Ma and 2440 ± 26 Ma, respectively, much earlier than the emplacement of the Dongjiagou granitic gneiss dated at 2036 ± 16 Ma. However, their metamorphic zircons yield similar concordant 207Pb/ 206Pb ages of 1847 ± 17 Ma, 1842 ± 10 Ma and 1847 ± 11 Ma for the tonalitic, trondhjemitic and granodioritic gneisses, respectively, and 1839 ± 46 Ma for the Dongjia granitic gneiss. These ages demonstrate that the Huai'an Complex underwent a regional metamorohic event at ∼1850 Ma, which is further supported by a mean 207Pb/ 206Pb age of 1848 ± 19 Ma for metamorphic zircons in the Manjinggou high-pressure mafic granulite and 1849 ± 10 Ma and 1850 ± 17 Ma for igneous zircons in the anatectic Huai'an charnockite and Dapinggou garnet-bearing S-type granite, respectively. The timing of late Archean to Paleoproterozoic magmatism and regional metamorphism in the Huai'an Complex is in general agreement with recent SHRIMP zircon data for other metamorphic complexes in the TNCO. These data prove that the high-grade gneiss complexes were hot the basement to the low-grade granite-greenstone terranes in the TNCO. Furthermore, the lithologies of the orogen are considered to have developed as a long-lived magmatic arc that was subsequently tectonically disrupted and juxtaposed during the collision of the Eastern and Western Blocks at ∼1.85 Ga, leading to final assembly of the North China Craton.
Persistent Identifierhttp://hdl.handle.net/10722/139213
ISSN
2015 Impact Factor: 3.566
2015 SCImago Journal Rankings: 2.104
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorWilde, SAen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorGuo, Jen_HK
dc.contributor.authorKröner, Aen_HK
dc.contributor.authorLi, Sen_HK
dc.contributor.authorLi, Xen_HK
dc.contributor.authorZhang, Jen_HK
dc.date.accessioned2011-09-23T05:47:11Z-
dc.date.available2011-09-23T05:47:11Z-
dc.date.issued2008en_HK
dc.identifier.citationAmerican Journal Of Science, 2008, v. 308 n. 3, p. 270-303en_HK
dc.identifier.issn0002-9599en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139213-
dc.description.abstractThe Huai'an Complex is situated in the northern segment of the Trans-North China Orogen (TNCO), a continent-continent collisional belt along which the discrete Archean Eastern and Western Blocks amalgamated to form the basement of the North China Craton. The complex consists of six distinct lithologic units: the Huai'an TTG gneisses, the Manjinggou high-pressure mafic granulites, the Khondalite Series, the Dongjiagou granitic gneiss, the Huai'an charnockite, and the Dapinggou K-feldspar granite. SHRIMP U-Pb geochronology, combined with Th and U data and cathodoluminescence (CL) imaging of zircons, enables resolution of magmatic and metamorphic events that can be directed towards understanding the late Archean to Paleoproterozoic history of the TNCO. CL images reveal the coexistence of magmatic and metamorphic zircons in most lithologies of the Huai'an Complex, of which the metamorphic zircons occur as either single grains or overgrowth rims surrounding and truncating oscillatory-zoned magmatic zircon cores. SHRIMP U-Pb analyses on magmatic zircons reveal that the tonalitic, trondhjemitic and granodioritic protoliths of the Huai'an TTG gneisses were emplaced at 2515 ± 20 Ma, 2499 ± 19 Ma and 2440 ± 26 Ma, respectively, much earlier than the emplacement of the Dongjiagou granitic gneiss dated at 2036 ± 16 Ma. However, their metamorphic zircons yield similar concordant 207Pb/ 206Pb ages of 1847 ± 17 Ma, 1842 ± 10 Ma and 1847 ± 11 Ma for the tonalitic, trondhjemitic and granodioritic gneisses, respectively, and 1839 ± 46 Ma for the Dongjia granitic gneiss. These ages demonstrate that the Huai'an Complex underwent a regional metamorohic event at ∼1850 Ma, which is further supported by a mean 207Pb/ 206Pb age of 1848 ± 19 Ma for metamorphic zircons in the Manjinggou high-pressure mafic granulite and 1849 ± 10 Ma and 1850 ± 17 Ma for igneous zircons in the anatectic Huai'an charnockite and Dapinggou garnet-bearing S-type granite, respectively. The timing of late Archean to Paleoproterozoic magmatism and regional metamorphism in the Huai'an Complex is in general agreement with recent SHRIMP zircon data for other metamorphic complexes in the TNCO. These data prove that the high-grade gneiss complexes were hot the basement to the low-grade granite-greenstone terranes in the TNCO. Furthermore, the lithologies of the orogen are considered to have developed as a long-lived magmatic arc that was subsequently tectonically disrupted and juxtaposed during the collision of the Eastern and Western Blocks at ∼1.85 Ga, leading to final assembly of the North China Craton.en_HK
dc.languageengen_US
dc.publisherAmerican Journal of Science. The Journal's web site is located at http://www.ajsonline.orgen_HK
dc.relation.ispartofAmerican Journal of Scienceen_HK
dc.subjectArchean-
dc.subjectGranulite-
dc.subjectMagmatism-
dc.subjectProterozoic-
dc.subjectNorth China block-
dc.titleSHRIMP U-Pb zircon geochronology of the Huai'an Complex: Constraints on Late Archean to Paleoproterozoic magmatic and metamorphic events in the Trans-North China Orogenen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0002-9599&volume=308&issue=3&spage=270&epage=303&date=2008&atitle=SHRIMP+U-Pb+zircon+geochronology+of+the+Huai’an+Complex:+constraints+on+late+Archean+to+Paleoproterozoic+magmatic+and+metamorphic+events+in+the+Trans-North+China+Orogen-
dc.identifier.emailZhao, G:gzhao@hkucc.hku.hken_HK
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.2475/03.2008.04en_HK
dc.identifier.scopuseid_2-s2.0-48749109886en_HK
dc.identifier.hkuros194912en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-48749109886&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume308en_HK
dc.identifier.issue3en_HK
dc.identifier.spage270en_HK
dc.identifier.epage303en_HK
dc.identifier.eissn1945-452X-
dc.identifier.isiWOS:000257038900005-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridWilde, SA=35254758600en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridGuo, J=7404489670en_HK
dc.identifier.scopusauthoridKröner, A=7006453132en_HK
dc.identifier.scopusauthoridLi, S=8784176300en_HK
dc.identifier.scopusauthoridLi, X=8553095200en_HK
dc.identifier.scopusauthoridZhang, J=7601341609en_HK

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