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Article: LA-ICP-MS U-Pb zircon ages of the khondalites from the Wulashan and Jining high-grade terrain in northern margin of the North China Craton: Constraints on sedimentary age of the khondalite

TitleLA-ICP-MS U-Pb zircon ages of the khondalites from the Wulashan and Jining high-grade terrain in northern margin of the North China Craton: Constraints on sedimentary age of the khondalite
Authors
KeywordsArchean vs Paleoproterozoic
Khondalite
LA-ICP-MS ages
North China Craton
Wulashan-Jining high-grade terrain
Issue Date2006
PublisherChinese Academy of Sciences, Institute of Geology and Geophysics. The Journal's web site is located at http://www.ysxb.ac.cn/ysxb/ch/index.aspx
Citation
Acta Petrologica Sinica, 2006, v. 22 n. 11, p. 2639-2654 How to Cite?
AbstractThe Wulashan and Jining Complexes in northern margin of the North China Craton are high grade terrains that are composed predominantly of TTG gneisses, granulites, amphibolites and khondalites. Traditionally, all these rocks were considered as metamorphic supracrustals and their ages were arbitrarily assigned according to their metamorphic grade, i. e. the higher grade rocks were older than those lower grade rocks. Recently, the complex has been divided into metamorphosed plutons and supracrustals, but their ages remain controversial, with most workers believing that the plutons formed in the middle Archean, whereas the khondalites formed in the late Archean. To resolve this important issue, we applied the LA-ICP-MS U-Pb zircon dating technique, combined with CL images of zircons, to determine the ages of detrital and metamorphic zircons in the khondalites from the Wulashan and Jining Complexes. The results show that the metamorphic zircons of the khondalites from the Wulashan and Jining Complexes formed at ∼1.8 Ga, consistent with the metamorphic ages of ∼1.85 Ga obtained using the TIMS method. Detrital zircons in the khondalites from the Hadamengou, Taoerwan and Yaoziwan areas of the Wulashan Complex yielded LA-ICP-MS U-Pb zircon ages ranging from 2.0 to 2.3 Ga, and the detrital zircons in the khondalites from the Huangtuyao area of the Jining Complex yielded the same age range. These ages demonstrate that the protoliths of khondalites from the Wulashan and Jining Complexes formed in the Paleoproterozoic, not in the Archean as previously considered. In addition, a kf-granite sample collected from the Damiao area of the Wulashan Complex yielded a LA-ICP-MS U-Pb zircon age of ∼2.5 Ga, similar to those ages already obtained for the granulites and TTG gneisses in the Wulashan and Jining Complexes. Although these Archean granulites, TTG gneisses and granites are spatially associated with the khondalites, the former are much older in age than the latter, which suggests that the protoliths of the khondalites were not in-situ deposition, but were allochthonous sediments whose interdigitation with the Archean granulites and TTG gneisses formed by the tectonic processes of the Lüliang Movement.
Persistent Identifierhttp://hdl.handle.net/10722/72577
ISSN
2015 Impact Factor: 1.234
2015 SCImago Journal Rankings: 0.892
References

 

DC FieldValueLanguage
dc.contributor.authorWu, CHen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorLi, HMen_HK
dc.contributor.authorZhao, GCen_HK
dc.contributor.authorXia, XPen_HK
dc.date.accessioned2010-09-06T06:43:08Z-
dc.date.available2010-09-06T06:43:08Z-
dc.date.issued2006en_HK
dc.identifier.citationActa Petrologica Sinica, 2006, v. 22 n. 11, p. 2639-2654en_HK
dc.identifier.issn1000-0569en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72577-
dc.description.abstractThe Wulashan and Jining Complexes in northern margin of the North China Craton are high grade terrains that are composed predominantly of TTG gneisses, granulites, amphibolites and khondalites. Traditionally, all these rocks were considered as metamorphic supracrustals and their ages were arbitrarily assigned according to their metamorphic grade, i. e. the higher grade rocks were older than those lower grade rocks. Recently, the complex has been divided into metamorphosed plutons and supracrustals, but their ages remain controversial, with most workers believing that the plutons formed in the middle Archean, whereas the khondalites formed in the late Archean. To resolve this important issue, we applied the LA-ICP-MS U-Pb zircon dating technique, combined with CL images of zircons, to determine the ages of detrital and metamorphic zircons in the khondalites from the Wulashan and Jining Complexes. The results show that the metamorphic zircons of the khondalites from the Wulashan and Jining Complexes formed at ∼1.8 Ga, consistent with the metamorphic ages of ∼1.85 Ga obtained using the TIMS method. Detrital zircons in the khondalites from the Hadamengou, Taoerwan and Yaoziwan areas of the Wulashan Complex yielded LA-ICP-MS U-Pb zircon ages ranging from 2.0 to 2.3 Ga, and the detrital zircons in the khondalites from the Huangtuyao area of the Jining Complex yielded the same age range. These ages demonstrate that the protoliths of khondalites from the Wulashan and Jining Complexes formed in the Paleoproterozoic, not in the Archean as previously considered. In addition, a kf-granite sample collected from the Damiao area of the Wulashan Complex yielded a LA-ICP-MS U-Pb zircon age of ∼2.5 Ga, similar to those ages already obtained for the granulites and TTG gneisses in the Wulashan and Jining Complexes. Although these Archean granulites, TTG gneisses and granites are spatially associated with the khondalites, the former are much older in age than the latter, which suggests that the protoliths of the khondalites were not in-situ deposition, but were allochthonous sediments whose interdigitation with the Archean granulites and TTG gneisses formed by the tectonic processes of the Lüliang Movement.en_HK
dc.languagechien_HK
dc.publisherChinese Academy of Sciences, Institute of Geology and Geophysics. The Journal's web site is located at http://www.ysxb.ac.cn/ysxb/ch/index.aspxen_HK
dc.relation.ispartofActa Petrologica Sinicaen_HK
dc.subjectArchean vs Paleoproterozoicen_HK
dc.subjectKhondaliteen_HK
dc.subjectLA-ICP-MS agesen_HK
dc.subjectNorth China Cratonen_HK
dc.subjectWulashan-Jining high-grade terrainen_HK
dc.titleLA-ICP-MS U-Pb zircon ages of the khondalites from the Wulashan and Jining high-grade terrain in northern margin of the North China Craton: Constraints on sedimentary age of the khondaliteen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1000-0569&volume=22&issue=11&spage=2639&epage=2654&date=2006&atitle=LA-ICP-MS+U-Pb+zircon+ages+of+the+khondalites+from+the+Wulashan+and+Jining+high-grade+terrain+in+northern+margin+of+the+North+China+Craton:+constraints+on+sedimentary+age+of+the+khondalite-
dc.identifier.emailSun, M: minsun@hku.hken_HK
dc.identifier.emailZhao, GC: gzhao@hkucc.hku.hken_HK
dc.identifier.emailXia, XP: xpxia@hotmail.comen_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.identifier.authorityZhao, GC=rp00842en_HK
dc.identifier.authorityXia, XP=rp00815en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-34047190448en_HK
dc.identifier.hkuros127564en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34047190448&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume22en_HK
dc.identifier.issue11en_HK
dc.identifier.spage2639en_HK
dc.identifier.epage2654en_HK
dc.publisher.placeChinaen_HK
dc.identifier.scopusauthoridWu, CH=7501661933en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridLi, HM=13408566500en_HK
dc.identifier.scopusauthoridZhao, GC=7403296321en_HK
dc.identifier.scopusauthoridXia, XP=35241486400en_HK

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