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Article: High-pressure mafic granulites in the Trans-North China Orogen: Tectonic significance and age

TitleHigh-pressure mafic granulites in the Trans-North China Orogen: Tectonic significance and age
Authors
KeywordsHigh-pressure granulite
North China Craton
P-T paths
Paleoproterozoic tectonics
Trans-North China Orogen
Issue Date2006
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcr
Citation
Gondwana Research, 2006, v. 9 n. 3, p. 349-362 How to Cite?
AbstractHigh-pressure mafic granulites (including retrograded eclogites) have been reported from the Trans-North China Orogen, a Paleoproterozoic orogenic belt along which two discrete continental blocks, referred to as the Eastern and Western Blocks, were amalgamated to form the North China Craton. Extensive metamorphic investigations and geochronology carried out over the last few years provide important insights into the age and significance of these high-pressure granulites, which are critical in understanding of the timing and tectonic processes involved in the assembly of the North China Craton. Most high-pressure mafic granulites in the Trans-North China Orogen preserve the high-pressure granulite facies assemblage garnet+plagioclase+clinopyroxene+quartz, the medium-pressure granulite facies assemblage garnet+plagioclase+clinopyroxene+orthopyroxene±quartz, the low-pressure granulite facies assemblage orthopyroxene+clinopyroxene+plagioclase±quartz, and the amphibolite facies assemblage hornblende+plagioclase. Minor high-pressure granulites preserve the early eclogite facies mineral assemblage of garnet+quartz+omphacite pseudomorph (clinopyroxene+Na-rich plagioclase), indicating that they are retrograded eclogites. These mineral assemblages and their P-T estimates define a clockwise P-T path involving near-isothermal decompression and cooling following the peak high-pressure metamorphism, which suggests that they formed during continent-continent collision. Field mapping and geochronology indicate that the precursors of these high-pressure granulites were mafic dykes which were emplaced at ∼1915 Ma and underwent high-pressure granulite facies metamorphism at ∼1.85 Ga. Taken together, the high-pressure granulites in the Trans-North China are considered to have resulted from final collision between the Eastern and Western Blocks to form the North China Craton at ∼1.85 Ga, not at ∼2.5 Ga as recently proposed by some authors. © 2005 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72847
ISSN
2015 Impact Factor: 8.743
2015 SCImago Journal Rankings: 4.949
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhang, Jen_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorWilde, SAen_HK
dc.contributor.authorLi, Sen_HK
dc.contributor.authorLiu, Sen_HK
dc.date.accessioned2010-09-06T06:45:40Z-
dc.date.available2010-09-06T06:45:40Z-
dc.date.issued2006en_HK
dc.identifier.citationGondwana Research, 2006, v. 9 n. 3, p. 349-362en_HK
dc.identifier.issn1342-937Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/72847-
dc.description.abstractHigh-pressure mafic granulites (including retrograded eclogites) have been reported from the Trans-North China Orogen, a Paleoproterozoic orogenic belt along which two discrete continental blocks, referred to as the Eastern and Western Blocks, were amalgamated to form the North China Craton. Extensive metamorphic investigations and geochronology carried out over the last few years provide important insights into the age and significance of these high-pressure granulites, which are critical in understanding of the timing and tectonic processes involved in the assembly of the North China Craton. Most high-pressure mafic granulites in the Trans-North China Orogen preserve the high-pressure granulite facies assemblage garnet+plagioclase+clinopyroxene+quartz, the medium-pressure granulite facies assemblage garnet+plagioclase+clinopyroxene+orthopyroxene±quartz, the low-pressure granulite facies assemblage orthopyroxene+clinopyroxene+plagioclase±quartz, and the amphibolite facies assemblage hornblende+plagioclase. Minor high-pressure granulites preserve the early eclogite facies mineral assemblage of garnet+quartz+omphacite pseudomorph (clinopyroxene+Na-rich plagioclase), indicating that they are retrograded eclogites. These mineral assemblages and their P-T estimates define a clockwise P-T path involving near-isothermal decompression and cooling following the peak high-pressure metamorphism, which suggests that they formed during continent-continent collision. Field mapping and geochronology indicate that the precursors of these high-pressure granulites were mafic dykes which were emplaced at ∼1915 Ma and underwent high-pressure granulite facies metamorphism at ∼1.85 Ga. Taken together, the high-pressure granulites in the Trans-North China are considered to have resulted from final collision between the Eastern and Western Blocks to form the North China Craton at ∼1.85 Ga, not at ∼2.5 Ga as recently proposed by some authors. © 2005 International Association for Gondwana Research. Published by 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/jcren_HK
dc.relation.ispartofGondwana Researchen_HK
dc.subjectHigh-pressure granuliteen_HK
dc.subjectNorth China Cratonen_HK
dc.subjectP-T pathsen_HK
dc.subjectPaleoproterozoic tectonicsen_HK
dc.subjectTrans-North China Orogenen_HK
dc.titleHigh-pressure mafic granulites in the Trans-North China Orogen: Tectonic significance and ageen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1342-937X&volume=9&issue=3&spage=349&epage=362&date=APR&atitle=High-pressure+mafic+granulites+in+the+Trans-North+China+Orogen:+tectonic+significance+and+ageen_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.gr.2005.10.005en_HK
dc.identifier.scopuseid_2-s2.0-33644789165en_HK
dc.identifier.hkuros120032en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33644789165&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume9en_HK
dc.identifier.issue3en_HK
dc.identifier.spage349en_HK
dc.identifier.epage362en_HK
dc.identifier.isiWOS:000238416600008-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridZhang, J=49061670600en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridWilde, SA=35254758600en_HK
dc.identifier.scopusauthoridLi, S=8784176300en_HK
dc.identifier.scopusauthoridLiu, S=35253878000en_HK

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