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Article: Th-U-Pb monazite geochronology of the Lüliang and Wutai Complexes: Constraints on the tectonothermal evolution of the Trans-North China Orogen

TitleTh-U-Pb monazite geochronology of the Lüliang and Wutai Complexes: Constraints on the tectonothermal evolution of the Trans-North China Orogen
Authors
KeywordsCrystal age mapping
Electron microprobe dating
North China Craton
Paleoproterozoic
Th-U-Pb monazite ages
Trans-North China Orogen
Issue Date2006
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamres
Citation
Precambrian Research, 2006, v. 148 n. 3-4, p. 205-224 How to Cite?
AbstractRecent lithological, metamorphic and geochronological studies show that the basement of the North China Craton (NCC) formed by collision of two discrete Archean to Paleoproterozoic blocks (Eastern and Western Blocks) along a Paleoproterozoic orogen, named the Trans-North China Orogen. However, the timing of the collision is controversial and post-collisional exhumation has not been precisely dated. This study applies the electron microprobe Th-U-Pb monazite dating technique to determine the ages of the peak metamorphic event and subsequent exhumation of the low- to medium-grade Lüliang and Wutai Complexes in the Trans-North China Orogen. Electron microprobe Th-U-Pb monazite data for the Lüliang Complex reveal five ThO2 */PbO age ranges: (1) 1940-1938 Ma, (2) 1880-1847 Ma, (3) 1795-1755 Ma, (4) 1720-1703 Ma, and (5) ∼1648 Ma. Of these age ranges, the first four have also been recorded in the Wutai Complex, which yields ThO2 */PbO ages of (1) ∼1930 Ma, (2) 1838-1822 Ma, (3) ∼1793 Ma, and (4) ∼1719 Ma. The oldest age range of 1940-1930 Ma is interpreted to record the widespread emplacement of mafic dikes in rocks of the Lüliang and Wutai Complexes. The age range of 1882-1822 Ma is in accord with the SHRIMP U-Pb ages of metamorphic zircons and mineral Sm-Nd and 40Ar/39Ar ages obtained for other complexes in the orogen, and is interpreted as the age of the major metamorphic event caused by amalgamation between the Eastern and the Western Blocks. The age range of 1795-1755 Ma is consistent with emplacement of large scale unmetamorphosed mafic swarms at 1800-1765 Ma, interpreted as the time of post-orogenic extension. The 1720-1703 Ma and ∼1648 Ma ages are considered to date later multiple stages of hydrothermal alteration, since monazites with such young ages only occur along fractures in older monazite grains and at the rims. These new monazite ThO2 */PbO ages support the tectonic model for the evolution of the North China Craton that envisages discrete Eastern and Western Blocks colliding along the Trans-North China Orogen at ∼1.85 Ga and then undergoing post-collisional extension in the period 1795-1755 Ma. © 2006 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72694
ISSN
2015 Impact Factor: 4.037
2015 SCImago Journal Rankings: 3.214
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLiu, Sen_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorWilde, SAen_HK
dc.contributor.authorShu, Gen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorLi, Qen_HK
dc.contributor.authorTian, Wen_HK
dc.contributor.authorZhang, Jen_HK
dc.date.accessioned2010-09-06T06:44:14Z-
dc.date.available2010-09-06T06:44:14Z-
dc.date.issued2006en_HK
dc.identifier.citationPrecambrian Research, 2006, v. 148 n. 3-4, p. 205-224en_HK
dc.identifier.issn0301-9268en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72694-
dc.description.abstractRecent lithological, metamorphic and geochronological studies show that the basement of the North China Craton (NCC) formed by collision of two discrete Archean to Paleoproterozoic blocks (Eastern and Western Blocks) along a Paleoproterozoic orogen, named the Trans-North China Orogen. However, the timing of the collision is controversial and post-collisional exhumation has not been precisely dated. This study applies the electron microprobe Th-U-Pb monazite dating technique to determine the ages of the peak metamorphic event and subsequent exhumation of the low- to medium-grade Lüliang and Wutai Complexes in the Trans-North China Orogen. Electron microprobe Th-U-Pb monazite data for the Lüliang Complex reveal five ThO2 */PbO age ranges: (1) 1940-1938 Ma, (2) 1880-1847 Ma, (3) 1795-1755 Ma, (4) 1720-1703 Ma, and (5) ∼1648 Ma. Of these age ranges, the first four have also been recorded in the Wutai Complex, which yields ThO2 */PbO ages of (1) ∼1930 Ma, (2) 1838-1822 Ma, (3) ∼1793 Ma, and (4) ∼1719 Ma. The oldest age range of 1940-1930 Ma is interpreted to record the widespread emplacement of mafic dikes in rocks of the Lüliang and Wutai Complexes. The age range of 1882-1822 Ma is in accord with the SHRIMP U-Pb ages of metamorphic zircons and mineral Sm-Nd and 40Ar/39Ar ages obtained for other complexes in the orogen, and is interpreted as the age of the major metamorphic event caused by amalgamation between the Eastern and the Western Blocks. The age range of 1795-1755 Ma is consistent with emplacement of large scale unmetamorphosed mafic swarms at 1800-1765 Ma, interpreted as the time of post-orogenic extension. The 1720-1703 Ma and ∼1648 Ma ages are considered to date later multiple stages of hydrothermal alteration, since monazites with such young ages only occur along fractures in older monazite grains and at the rims. These new monazite ThO2 */PbO ages support the tectonic model for the evolution of the North China Craton that envisages discrete Eastern and Western Blocks colliding along the Trans-North China Orogen at ∼1.85 Ga and then undergoing post-collisional extension in the period 1795-1755 Ma. © 2006 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamresen_HK
dc.relation.ispartofPrecambrian Researchen_HK
dc.subjectCrystal age mappingen_HK
dc.subjectElectron microprobe datingen_HK
dc.subjectNorth China Cratonen_HK
dc.subjectPaleoproterozoicen_HK
dc.subjectTh-U-Pb monazite agesen_HK
dc.subjectTrans-North China Orogenen_HK
dc.titleTh-U-Pb monazite geochronology of the Lüliang and Wutai Complexes: Constraints on the tectonothermal evolution of the Trans-North China Orogenen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0301-9268&volume=148&issue=3-4&spage=205&epage=224&date=2006&atitle=Th-U-Pb+monazite+geochronology+of+the+Lüliang+and+Wutai+Complexes:+Constraints+on+the+tectonothermal+evolution+of+the+Trans-North+China+Orogenen_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_subscribed_fulltext-
dc.identifier.doi10.1016/j.precamres.2006.04.003en_HK
dc.identifier.scopuseid_2-s2.0-33746191717en_HK
dc.identifier.hkuros127556en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33746191717&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume148en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage205en_HK
dc.identifier.epage224en_HK
dc.identifier.isiWOS:000239742800002-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridLiu, S=35253878000en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridWilde, SA=35254758600en_HK
dc.identifier.scopusauthoridShu, G=14046160500en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridLi, Q=8287445100en_HK
dc.identifier.scopusauthoridTian, W=23020305700en_HK
dc.identifier.scopusauthoridZhang, J=49061670600en_HK

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