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Article: New shrimp U-Pb zircon ages from the heilongjiang high-pressure belt: Constraints on the mesozoic evolution of ne china

TitleNew shrimp U-Pb zircon ages from the heilongjiang high-pressure belt: Constraints on the mesozoic evolution of ne china
Authors
KeywordsGeochronology
Granite
High pressure
Uranium-lead dating
China
Issue Date2010
PublisherAmerican Journal of Science. The Journal's web site is located at http://www.ajsonline.org
Citation
American Journal Of Science, 2010, v. 310 n. 9, p. 1024-1053 How to Cite?
AbstractThe Heilongjiang Complex is a high-pressure accretionary belt composed mainly of serpentinite, glaucophane-bearing metabasalt, epidote- glaucophanealbite schist, greenschist, marble, two-mica schist, muscovite-albite schist, quartz schist, and quartzite (chert), located along the suture zone separating the Jiamusi and Songliao blocks in NE China. SHRIMP U-Pb zircon analyses of two samples of granitic gneiss from Yilan that are interleaved with the Heilongjiang Complex record diverse protolith ages that are consistent with derivation from regional Permian granitoids (263 ± 7 Ma) and the adjacent Mashan Complex (492 ± 6 Ma), indicating tectonic incorporation of older granitic components into the accretionary complex. The age of the basaltic protolith of two samples of glaucophane-albite schist from Yilan is ±245 Ma and is slightly younger than the protolith age of two samples of amphibole schist from Mudanjiang, located about 200 km south of Yilan, that define weighted mean 206Pb/238U ages of 257 ± 4 and 257 ± 5 Ma. All four samples contain a few older inherited zircon grains and also show the effects of an isotopic disturbance at ∼200 to 190 Ma, most likely related to the subsequent high-pressure metamorphism, the timing of which has been determined in previous studies. The basaltic rocks record rifting and ocean development from ∼260 to 210 Ma, based on previous studies in which both E-MORB and OIB protolith signatures were identified. Detrital zircons in two samples of mica schist from Mudanjiang show distinct populations at ±700 Ma, 500 to 450 Ma, 350 to 213 Ma (peak at 255 Ma), 290 to 200 Ma and ∼200 Ma. All except the youngest ages can be matched with rocks from the older components of the Jiamusi block and with other areas in the Central Asia Orogenic Belt (CAOB), supporting the view that the Jiamusi block was most likely the eastern segment of the CAOB prior to rifting. The youngest concordant magmatic detrital grain with an age of 207 ± 3 Ma defines the maximum age of sedimentation. This also limits the timing of high-pressure metamorphism in the Heilongjiang Complex to post-Late Triassic, consistent with argon data obtained in previous studies. Final closure between the Jiamusi and Songliao blocks took place in the latest-Triassic-Early Jurassic, with the two blocks accreted as a result of Pacific Ocean subduction. This suggests that the Heilongjiang Complex records thetime when north-south closure of the CAOB in China gave way to westward movement related to the Pacific Oceansubduction, which has dominated the tectonics of NE China and Far East Russia since that time.
Persistent Identifierhttp://hdl.handle.net/10722/139188
ISSN
2015 Impact Factor: 3.566
2015 SCImago Journal Rankings: 2.104
ISI Accession Number ID
Funding AgencyGrant Number
Natural Science Foundation of China40672148
40739905
40872121
Ministry of Science and Technology of the P.R. China2009CB825008
Institute for Geoscience Research (TIGeR)211
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). Professors Boris Natal'in, Fu-Yuan Wu and Wen-Jiao Xiao are thanked for their constructive comments that helped to improve the manuscript. We also thank Peter Cawood (Guest Editor) for his comments and assistance. This is The Institute for Geoscience Research (TIGeR) publication No. 211.

References

 

DC FieldValueLanguage
dc.contributor.authorZhou, JBen_HK
dc.contributor.authorWilde, SAen_HK
dc.contributor.authorZhao, GCen_HK
dc.contributor.authorZhang, XZen_HK
dc.contributor.authorZheng, CQen_HK
dc.contributor.authorWang, Hen_HK
dc.date.accessioned2011-09-23T05:46:28Z-
dc.date.available2011-09-23T05:46:28Z-
dc.date.issued2010en_HK
dc.identifier.citationAmerican Journal Of Science, 2010, v. 310 n. 9, p. 1024-1053en_HK
dc.identifier.issn0002-9599en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139188-
dc.description.abstractThe Heilongjiang Complex is a high-pressure accretionary belt composed mainly of serpentinite, glaucophane-bearing metabasalt, epidote- glaucophanealbite schist, greenschist, marble, two-mica schist, muscovite-albite schist, quartz schist, and quartzite (chert), located along the suture zone separating the Jiamusi and Songliao blocks in NE China. SHRIMP U-Pb zircon analyses of two samples of granitic gneiss from Yilan that are interleaved with the Heilongjiang Complex record diverse protolith ages that are consistent with derivation from regional Permian granitoids (263 ± 7 Ma) and the adjacent Mashan Complex (492 ± 6 Ma), indicating tectonic incorporation of older granitic components into the accretionary complex. The age of the basaltic protolith of two samples of glaucophane-albite schist from Yilan is ±245 Ma and is slightly younger than the protolith age of two samples of amphibole schist from Mudanjiang, located about 200 km south of Yilan, that define weighted mean 206Pb/238U ages of 257 ± 4 and 257 ± 5 Ma. All four samples contain a few older inherited zircon grains and also show the effects of an isotopic disturbance at ∼200 to 190 Ma, most likely related to the subsequent high-pressure metamorphism, the timing of which has been determined in previous studies. The basaltic rocks record rifting and ocean development from ∼260 to 210 Ma, based on previous studies in which both E-MORB and OIB protolith signatures were identified. Detrital zircons in two samples of mica schist from Mudanjiang show distinct populations at ±700 Ma, 500 to 450 Ma, 350 to 213 Ma (peak at 255 Ma), 290 to 200 Ma and ∼200 Ma. All except the youngest ages can be matched with rocks from the older components of the Jiamusi block and with other areas in the Central Asia Orogenic Belt (CAOB), supporting the view that the Jiamusi block was most likely the eastern segment of the CAOB prior to rifting. The youngest concordant magmatic detrital grain with an age of 207 ± 3 Ma defines the maximum age of sedimentation. This also limits the timing of high-pressure metamorphism in the Heilongjiang Complex to post-Late Triassic, consistent with argon data obtained in previous studies. Final closure between the Jiamusi and Songliao blocks took place in the latest-Triassic-Early Jurassic, with the two blocks accreted as a result of Pacific Ocean subduction. This suggests that the Heilongjiang Complex records thetime when north-south closure of the CAOB in China gave way to westward movement related to the Pacific Oceansubduction, which has dominated the tectonics of NE China and Far East Russia since that time.en_HK
dc.languageengen_US
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.subjectGeochronology-
dc.subjectGranite-
dc.subjectHigh pressure-
dc.subjectUranium-lead dating-
dc.subjectChina-
dc.titleNew shrimp U-Pb zircon ages from the heilongjiang high-pressure belt: Constraints on the mesozoic evolution of ne chinaen_HK
dc.typeArticleen_HK
dc.identifier.emailZhao, GC:gzhao@hkucc.hku.hken_HK
dc.identifier.authorityZhao, GC=rp00842en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.2475/09.2010.10en_HK
dc.identifier.scopuseid_2-s2.0-79952797660en_HK
dc.identifier.hkuros193918en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79952797660&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume310en_HK
dc.identifier.issue9en_HK
dc.identifier.spage1024en_HK
dc.identifier.epage1053en_HK
dc.identifier.isiWOS:000288405900011-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridZhou, JB=35387284500en_HK
dc.identifier.scopusauthoridWilde, SA=35254758600en_HK
dc.identifier.scopusauthoridZhao, GC=7403296321en_HK
dc.identifier.scopusauthoridZhang, XZ=35075584500en_HK
dc.identifier.scopusauthoridZheng, CQ=35304385700en_HK
dc.identifier.scopusauthoridWang, H=35729754800en_HK

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