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Article: SHRIMP U-Pb zircon ages of the Fuping Complex: Implications for Late Archean to Paleoproterozoic accretion and assembly of the North China Craton

TitleSHRIMP U-Pb zircon ages of the Fuping Complex: Implications for Late Archean to Paleoproterozoic accretion and assembly of the North China Craton
Authors
Issue Date2002
PublisherAmerican Journal of Science. The Journal's web site is located at http://www.ajsonline.org
Citation
American Journal Of Science, 2002, v. 302 n. 3, p. 191-226 How to Cite?
AbstractThe Fuping Complex is situated in the central part of the North China Craton and consists of four major lithological assemblages: Fuping tonalitic-trondhjemitic-granodioritic gneisses, Longquanguan augen gneisses, Wanzi supracrustal assemblage and Nanying granitic gneisses. SHRIMP U-Pb geochronology combined with U-Th and cathodoluminescence (CL) imaging of zircon enables resolution of magmatic and metamorphic events that can be directed towards understanding the late Archean to Paleoproterozoic history of the Fuping Complex. CL images reveal the coexistence of magmatic and metamorphic zircons in nearly all rock types of the Fuping Complex. The metamorphic zircons occur as either single grains or overgrowth (or recrystallization) rims surrounding and truncating oscillatory-zoned magmatic zircon cores, and are all characterized by nebulous zoning or being structureless, with extremely high luminescence and very low Th contents. These features make them distinct from magmatic zircons that are characterized by concentric oscillatory zoning, comparatively low luminescence and high Th and U contents. SHRIMP U-Pb analyses on magmatic zircons reveal that the tonalitic, trondhjemitic and granodioritic plutons of the Fuping gneisses were emplaced at 2523 ± 14 Ma, 2499 ± 10 Ma and 2486 ± 8 Ma, respectively; whereas the monzogranitic and granitic plutons of the Longquanguan augen gneisses were intruded, respectively, at 2510 ± 22 Ma and 2507 ± 11 Ma. Prismatic and oscillatory-zoned zircons dominate in the pelitic rocks of the Wanzi supracrustal assemblage and are interpreted as detritus from igneous source rocks. The concordant and discordant U-Pb ages of 2502 ± 5 Ma and 2507 ± 14 Ma obtained from two pelitic rock samples indicate these rocks must have been deposited no earlier than ∼2507 Ma ago. In addition, a zoned zircon grain in one pelitic rock sample has a near concordant age of 2109 ± 5 (1σ) Ma, which may provide a maximum depositional age for the Wanzi supracrustal rocks. SHRIMP results also reveal that granitic magmatism assigned to the Nanying granitic gneisses occured over a protected interval from ∼2077 ± 13 Ma to ∼2024 ± 21 Ma. The nebulously-zoned zircon grains and overgrowth/recrystallization zircon rims from different rocks yielded similar concordant 207Pb/ 206Pb ages in the range 1875 to 1802 Ma, interpreted as approximating the age of regional metamorphism of the Fuping Complex. Timing of primary zircon crystallization and regional metamorphism of the Fuping Complex is in general agreement with recent U-Pb zircon ion probe results for the Wutai and Hengshan Complexes that bound the Fuping Complex to the northwest. These areas are characterized by the emplacement of major granitoid bodies at around 2.50 Ga to 2.48 Ga ago, deposition of supracrustal rocks in the Paleoproterozoic, intrusion of Paleoproterozoic granitic bodies at 2.1 to 2.0 Ga, and regional metamorphism at 1.875 to 1.802 Ga. These data indicate that the Fuping and Hengshan Complexes do not represent an older crystalline basement to the Wutai Complex, as suggested in previous tectonic models but, together with the Wutai Complex, represent elements of a single late Archean to Paleoproterozoic magmatic arc system that has been subsequently tectonically disrupted and juxtaposed during the collision of the eastern and western North China blocks at ∼1.85 Ga, which resulted in the final assembly of the North China Craton.
Persistent Identifierhttp://hdl.handle.net/10722/72964
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.authorCawood, PAen_HK
dc.contributor.authorSun, Men_HK
dc.date.accessioned2010-09-06T06:46:46Z-
dc.date.available2010-09-06T06:46:46Z-
dc.date.issued2002en_HK
dc.identifier.citationAmerican Journal Of Science, 2002, v. 302 n. 3, p. 191-226en_HK
dc.identifier.issn0002-9599en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72964-
dc.description.abstractThe Fuping Complex is situated in the central part of the North China Craton and consists of four major lithological assemblages: Fuping tonalitic-trondhjemitic-granodioritic gneisses, Longquanguan augen gneisses, Wanzi supracrustal assemblage and Nanying granitic gneisses. SHRIMP U-Pb geochronology combined with U-Th and cathodoluminescence (CL) imaging of zircon enables resolution of magmatic and metamorphic events that can be directed towards understanding the late Archean to Paleoproterozoic history of the Fuping Complex. CL images reveal the coexistence of magmatic and metamorphic zircons in nearly all rock types of the Fuping Complex. The metamorphic zircons occur as either single grains or overgrowth (or recrystallization) rims surrounding and truncating oscillatory-zoned magmatic zircon cores, and are all characterized by nebulous zoning or being structureless, with extremely high luminescence and very low Th contents. These features make them distinct from magmatic zircons that are characterized by concentric oscillatory zoning, comparatively low luminescence and high Th and U contents. SHRIMP U-Pb analyses on magmatic zircons reveal that the tonalitic, trondhjemitic and granodioritic plutons of the Fuping gneisses were emplaced at 2523 ± 14 Ma, 2499 ± 10 Ma and 2486 ± 8 Ma, respectively; whereas the monzogranitic and granitic plutons of the Longquanguan augen gneisses were intruded, respectively, at 2510 ± 22 Ma and 2507 ± 11 Ma. Prismatic and oscillatory-zoned zircons dominate in the pelitic rocks of the Wanzi supracrustal assemblage and are interpreted as detritus from igneous source rocks. The concordant and discordant U-Pb ages of 2502 ± 5 Ma and 2507 ± 14 Ma obtained from two pelitic rock samples indicate these rocks must have been deposited no earlier than ∼2507 Ma ago. In addition, a zoned zircon grain in one pelitic rock sample has a near concordant age of 2109 ± 5 (1σ) Ma, which may provide a maximum depositional age for the Wanzi supracrustal rocks. SHRIMP results also reveal that granitic magmatism assigned to the Nanying granitic gneisses occured over a protected interval from ∼2077 ± 13 Ma to ∼2024 ± 21 Ma. The nebulously-zoned zircon grains and overgrowth/recrystallization zircon rims from different rocks yielded similar concordant 207Pb/ 206Pb ages in the range 1875 to 1802 Ma, interpreted as approximating the age of regional metamorphism of the Fuping Complex. Timing of primary zircon crystallization and regional metamorphism of the Fuping Complex is in general agreement with recent U-Pb zircon ion probe results for the Wutai and Hengshan Complexes that bound the Fuping Complex to the northwest. These areas are characterized by the emplacement of major granitoid bodies at around 2.50 Ga to 2.48 Ga ago, deposition of supracrustal rocks in the Paleoproterozoic, intrusion of Paleoproterozoic granitic bodies at 2.1 to 2.0 Ga, and regional metamorphism at 1.875 to 1.802 Ga. These data indicate that the Fuping and Hengshan Complexes do not represent an older crystalline basement to the Wutai Complex, as suggested in previous tectonic models but, together with the Wutai Complex, represent elements of a single late Archean to Paleoproterozoic magmatic arc system that has been subsequently tectonically disrupted and juxtaposed during the collision of the eastern and western North China blocks at ∼1.85 Ga, which resulted in the final assembly of the North China Craton.en_HK
dc.languageengen_HK
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.titleSHRIMP U-Pb zircon ages of the Fuping Complex: Implications for Late Archean to Paleoproterozoic accretion and assembly of the North China Cratonen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0002-9599&volume=302&spage=191&epage=226&date=2002&atitle=SHRIMP+U-Pb+zircon+ages+of+the+Fuping+Complex:+implications+for+late+Archean+to+Paleoproterozoic+accretion+and+assembly+of+the+North+China+Cratonen_HK
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_OA_fulltext-
dc.identifier.doi10.2475/ajs.302.3.191-
dc.identifier.scopuseid_2-s2.0-0036022591en_HK
dc.identifier.hkuros71854en_HK
dc.identifier.hkuros81935-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0036022591&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume302en_HK
dc.identifier.issue3en_HK
dc.identifier.spage191en_HK
dc.identifier.epage226en_HK
dc.identifier.isiWOS:000176911900002-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridWilde, SA=35254758600en_HK
dc.identifier.scopusauthoridCawood, PA=7004146041en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.customcontrol.immutablesml 130313-

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