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Article: The onset of Pacific margin accretion in NE China: Evidence from the Heilongjiang high-pressure metamorphic belt

TitleThe onset of Pacific margin accretion in NE China: Evidence from the Heilongjiang high-pressure metamorphic belt
Authors
KeywordsCentral Asian Orogenic Belt
Epidote-blueschist facies
Heilongjiang Complex
HP metamorphism
Pacific Accretion
SHRIMP U-Pb zircon dating
Issue Date2009
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/tecto
Citation
Tectonophysics, 2009, v. 478 n. 3-4, p. 230-246 How to Cite?
AbstractThe Heilongjiang Complex is a sequence of high-pressure metamorphic rocks, located along the suture zone that separates the Jiamusi-Khanka (-Bureya) and Songliao-Zhangguangcai blocks in NE China (and extending northward into Far East Russia). The complex consists of mafic-ultramafic rocks, various quartzo-feldspathic schists and radiolarian-bearing quartzite (formerly chert). The rocks were metamorphosed up to epidote-blueschist facies, with P-T conditions of approximately T = 320-450 °C and P = 0.9-1.1 GPa. The lithological association and major and trace element compositions indicate that the blueschists were metabasalts of OIB and E-MORB affinity, most likely generated in a rift setting at the western margin of the Jiamusi Block that later underwent subduction. Magmatic zircons extracted from two samples of epidote-blueschist facies metabasalts from Mudanjiang have SHRIMP U-Pb 206Pb/238U ages of 213 ± 2 Ma and 224 ±7 Ma, whereas similar rocks ∼ 200 km farther north at Yilan have ages of 258 ± 2 Ma and 259 ± 4 Ma. These data define the protolith ages of the metabasalts as Late Triassic and Late Permian, respectively. These ages limit the timing of high-pressure metamorphism in the Heilongjiang Complex to post-Late Triassic, consistent with argon data reported from previous studies. Inherited zircon components in all four epidote-blueschist facies samples show distinct populations at 290-330 Ma, 420-530 Ma, 670-910 Ma and > 1065 Ma. Such ages are also a feature of the Central Asia Orogenic Belt (CAOB) to the west, supporting the view that the Jiamusi Block was most likely the rifted easternmost segment of the CAOB and not an exotic block derived from Gondwana. Final closure between the Jiamusi-Khanka-Bureya and Songliao blocks took place in the latest Triassic to Early Jurassic, with the two blocks accreted as a result of Pacific Ocean subduction. This suggests that the Heilongjiang Complex records the time when northward movement of the combined Mongolia-North China Block toward Siberia was waning and becoming surpassed by the onset of Pacific accretion from the east, which has dominated the tectonics of NE China and Far East Russia since the Early Jurassic. © 2009 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/123920
ISSN
2015 Impact Factor: 2.65
2015 SCImago Journal Rankings: 1.971
ISI Accession Number ID
Funding AgencyGrant Number
Natural Science Foundation of China40672148
40739905
40872121
Ministry of Science and Technology of the P.R. China2009CB825008
Funding Information:

This study was funded by grants from the Natural Science Foundation of China (40672148,40739905 and 40872121), the Ministry of Science and Technology of the P.R. China (2009CB825008), the Key laboratory of Isotope Geochronology and Geochemistry, GIG of CAS (GIGIso-08-05). We thank Adam Frew for assistance with SHRIMP analyses and Mao Qian and Wang Hu for assistance with electron microprobe analyses. The final version of the paper has benefited from the perceptive comments of an anonymous reviewer; we also thank Mike Sandiford (editor) for handling this manuscript. The Western Australia SHRIMP Facility is jointly run by Curtin University of Technology, the University of Western Australia and the Geological Survey of Western Australia. This is the Institute for Geosciences Research (TIGeR) Publication No. 201.

References

 

DC FieldValueLanguage
dc.contributor.authorZhou, JBen_HK
dc.contributor.authorWilde, SAen_HK
dc.contributor.authorZhang, XZen_HK
dc.contributor.authorZhao, GCen_HK
dc.contributor.authorZheng, CQen_HK
dc.contributor.authorWang, YJen_HK
dc.contributor.authorZhang, XHen_HK
dc.date.accessioned2010-10-07T06:55:40Z-
dc.date.available2010-10-07T06:55:40Z-
dc.date.issued2009en_HK
dc.identifier.citationTectonophysics, 2009, v. 478 n. 3-4, p. 230-246en_HK
dc.identifier.issn0040-1951en_HK
dc.identifier.urihttp://hdl.handle.net/10722/123920-
dc.description.abstractThe Heilongjiang Complex is a sequence of high-pressure metamorphic rocks, located along the suture zone that separates the Jiamusi-Khanka (-Bureya) and Songliao-Zhangguangcai blocks in NE China (and extending northward into Far East Russia). The complex consists of mafic-ultramafic rocks, various quartzo-feldspathic schists and radiolarian-bearing quartzite (formerly chert). The rocks were metamorphosed up to epidote-blueschist facies, with P-T conditions of approximately T = 320-450 °C and P = 0.9-1.1 GPa. The lithological association and major and trace element compositions indicate that the blueschists were metabasalts of OIB and E-MORB affinity, most likely generated in a rift setting at the western margin of the Jiamusi Block that later underwent subduction. Magmatic zircons extracted from two samples of epidote-blueschist facies metabasalts from Mudanjiang have SHRIMP U-Pb 206Pb/238U ages of 213 ± 2 Ma and 224 ±7 Ma, whereas similar rocks ∼ 200 km farther north at Yilan have ages of 258 ± 2 Ma and 259 ± 4 Ma. These data define the protolith ages of the metabasalts as Late Triassic and Late Permian, respectively. These ages limit the timing of high-pressure metamorphism in the Heilongjiang Complex to post-Late Triassic, consistent with argon data reported from previous studies. Inherited zircon components in all four epidote-blueschist facies samples show distinct populations at 290-330 Ma, 420-530 Ma, 670-910 Ma and > 1065 Ma. Such ages are also a feature of the Central Asia Orogenic Belt (CAOB) to the west, supporting the view that the Jiamusi Block was most likely the rifted easternmost segment of the CAOB and not an exotic block derived from Gondwana. Final closure between the Jiamusi-Khanka-Bureya and Songliao blocks took place in the latest Triassic to Early Jurassic, with the two blocks accreted as a result of Pacific Ocean subduction. This suggests that the Heilongjiang Complex records the time when northward movement of the combined Mongolia-North China Block toward Siberia was waning and becoming surpassed by the onset of Pacific accretion from the east, which has dominated the tectonics of NE China and Far East Russia since the Early Jurassic. © 2009 Elsevier B.V. All rights reserved.en_HK
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/tectoen_HK
dc.relation.ispartofTectonophysicsen_HK
dc.rightsTectonophysics. Copyright © Elsevier BV.-
dc.subjectCentral Asian Orogenic Belten_HK
dc.subjectEpidote-blueschist faciesen_HK
dc.subjectHeilongjiang Complexen_HK
dc.subjectHP metamorphismen_HK
dc.subjectPacific Accretionen_HK
dc.subjectSHRIMP U-Pb zircon datingen_HK
dc.titleThe onset of Pacific margin accretion in NE China: Evidence from the Heilongjiang high-pressure metamorphic belten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0040-1951&volume=478&issue=3-4&spage=230&epage=246&date=2009&atitle=The+onset+of+Pacific+margin+accretion+in+NE+China:+evidence+from+the+Heilongjiang+high-pressure+metamorphic+belt-
dc.identifier.emailZhao, GC:gzhao@hkucc.hku.hken_HK
dc.identifier.authorityZhao, GC=rp00842en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.tecto.2009.08.009en_HK
dc.identifier.scopuseid_2-s2.0-70449100778en_HK
dc.identifier.hkuros175429-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-70449100778&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume478en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage230en_HK
dc.identifier.epage246en_HK
dc.identifier.isiWOS:000272733800007-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridZhou, JB=35387284500en_HK
dc.identifier.scopusauthoridWilde, SA=35254758600en_HK
dc.identifier.scopusauthoridZhang, XZ=35075584500en_HK
dc.identifier.scopusauthoridZhao, GC=7403296321en_HK
dc.identifier.scopusauthoridZheng, CQ=35304385700en_HK
dc.identifier.scopusauthoridWang, YJ=49261327300en_HK
dc.identifier.scopusauthoridZhang, XH=49161358500en_HK
dc.identifier.citeulike5550482-

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