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Article: Episodic growth of Precambrian lower crust beneath the North China Craton: A synthesis

TitleEpisodic growth of Precambrian lower crust beneath the North China Craton: A synthesis
Authors
KeywordsCrustal Evolution
Episodic Magmatism
Hf-Isotopes
North China Craton
U-Pb Geochronology
Zircon
Issue Date2012
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamres
Citation
Precambrian Research, 2012, v. 222-223, p. 255-264 How to Cite?
AbstractA comprehensive review of U-Pb geochronology and Hf isotopes of zircons separated from granulite xenoliths entrained in Phanerozoic magmatic rocks and inherited xenocrysts from the associated lower crust rocks from various domains of the North China Craton (NCC) provides new insights into understanding the evolution of the lower crust in this part of the Precambrian nucleus of Asia. The oldest zircons recorded in granulite xenoliths show ages up to 3.6 Ga, slightly younger than the oldest zircons (3.8 Ga) from samples of the exposed Archean upper crust. However, the Hf isotope features indicate that the oldest lower crust might have been derived from a 4.0 to 4.1 Ga primordial crust as indicated by the data from an inherited zircon in the North Qinling Orogenic Belt at the southern part of the NCC. Our synthesis also suggests that ca. 2.5 Ga mark an important period for the evolution of the lower crust of the NCC and the cratonization of the Archean blocks in the NCC, at least for the Eastern Block, with a possible link to mantle plume activity. The occasional presence of zircons with 2.6-3.1 Ga ages in the lower crustal granulite xenoliths suggests a continuous reworking of the Paleoarchean lower crust during the Archean. The comprehensive data also show that 1.8-2.0 Ga period was the first significant event for the evolution of the lower crust after the cratonization of the Archean blocks of the NCC, which affected the whole lower crust of the Eastern NCC. Episodic growth or rejuvenation of the Precambrian lower crust beneath the NCC is also revealed by U-Pb and Hf isotope data, resulting from the corresponding addition of juvenile materials from mantle to lower crust, with a mixing of the old crust with juvenile magma. This compositional modification of the lower crust resembles the compositional transformation from the refractory lithospheric mantle to a fertile one through the refractory peridotite - infiltrated melt reaction as revealed in the lithospheric mantle beneath the NCC. © 2011 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151313
ISSN
2015 Impact Factor: 4.037
2015 SCImago Journal Rankings: 3.214
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhang, HFen_US
dc.contributor.authorYing, JFen_US
dc.contributor.authorSantosh, Men_US
dc.contributor.authorZhao, GCen_US
dc.date.accessioned2012-06-26T06:20:28Z-
dc.date.available2012-06-26T06:20:28Z-
dc.date.issued2012en_US
dc.identifier.citationPrecambrian Research, 2012, v. 222-223, p. 255-264en_US
dc.identifier.issn0301-9268en_US
dc.identifier.urihttp://hdl.handle.net/10722/151313-
dc.description.abstractA comprehensive review of U-Pb geochronology and Hf isotopes of zircons separated from granulite xenoliths entrained in Phanerozoic magmatic rocks and inherited xenocrysts from the associated lower crust rocks from various domains of the North China Craton (NCC) provides new insights into understanding the evolution of the lower crust in this part of the Precambrian nucleus of Asia. The oldest zircons recorded in granulite xenoliths show ages up to 3.6 Ga, slightly younger than the oldest zircons (3.8 Ga) from samples of the exposed Archean upper crust. However, the Hf isotope features indicate that the oldest lower crust might have been derived from a 4.0 to 4.1 Ga primordial crust as indicated by the data from an inherited zircon in the North Qinling Orogenic Belt at the southern part of the NCC. Our synthesis also suggests that ca. 2.5 Ga mark an important period for the evolution of the lower crust of the NCC and the cratonization of the Archean blocks in the NCC, at least for the Eastern Block, with a possible link to mantle plume activity. The occasional presence of zircons with 2.6-3.1 Ga ages in the lower crustal granulite xenoliths suggests a continuous reworking of the Paleoarchean lower crust during the Archean. The comprehensive data also show that 1.8-2.0 Ga period was the first significant event for the evolution of the lower crust after the cratonization of the Archean blocks of the NCC, which affected the whole lower crust of the Eastern NCC. Episodic growth or rejuvenation of the Precambrian lower crust beneath the NCC is also revealed by U-Pb and Hf isotope data, resulting from the corresponding addition of juvenile materials from mantle to lower crust, with a mixing of the old crust with juvenile magma. This compositional modification of the lower crust resembles the compositional transformation from the refractory lithospheric mantle to a fertile one through the refractory peridotite - infiltrated melt reaction as revealed in the lithospheric mantle beneath the NCC. © 2011 Elsevier B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamresen_US
dc.relation.ispartofPrecambrian Researchen_US
dc.subjectCrustal Evolutionen_US
dc.subjectEpisodic Magmatismen_US
dc.subjectHf-Isotopesen_US
dc.subjectNorth China Cratonen_US
dc.subjectU-Pb Geochronologyen_US
dc.subjectZirconen_US
dc.titleEpisodic growth of Precambrian lower crust beneath the North China Craton: A synthesisen_US
dc.typeArticleen_US
dc.identifier.emailZhao, GC:gzhao@hkucc.hku.hken_US
dc.identifier.authorityZhao, GC=rp00842en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.precamres.2011.04.006en_US
dc.identifier.scopuseid_2-s2.0-84867010228en_US
dc.identifier.hkuros219471-
dc.identifier.isiWOS:000313765700013-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridZhang, HF=36717171200en_US
dc.identifier.scopusauthoridYing, JF=7102534977en_US
dc.identifier.scopusauthoridSantosh, M=7005398812en_US
dc.identifier.scopusauthoridZhao, GC=7403296321en_US
dc.identifier.citeulike9320391-

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