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Article: Geochronology of khondalite-series rocks of the Jining Complex: Confirmation of depositional age and tectonometamorphic evolution of the North China craton

TitleGeochronology of khondalite-series rocks of the Jining Complex: Confirmation of depositional age and tectonometamorphic evolution of the North China craton
Authors
Keywordsdetrital zircons
Jining Complex
khondalites
LA-ICP-MS
North China craton
U-Pb ages
Issue Date2011
PublisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/TIGR
Citation
International Geology Review, 2011, v. 53 n. 10, p. 1194-1211 How to Cite?
AbstractA belt of khondalite-series rocks in the Western Block of the North China craton (NCC) are considered to represent products of the collision between the north Yinshan and the south Ordos terranes before final amalgamation of the NCC basement. The Jining Complex of Inner Mongolia occurs in the eastern part of the Khondalite Belt and is crosscut by the Trans-North China Orogen. Khondalite rocks of the Jining Complex mainly comprise sillimanite-garnet gneiss, garnet/sillimanite-bearing granite, massive porphyritic granite, garnet quartzite, calc-silicate, and marble with minor felsic gneiss and mafic granulite. LA-ICP-MS, U-Pb dating and cathodoluminescence (CL) image analysis of zircons from five rocks from the complex, i.e. Sil-Bt-Grt leptynite gneiss, Spl-Sil-Ksp-Grt vein in (Crd)-Sil-Grt gneiss, Sil-Grt-K-Fsp mylonite from a shear zone, Crd-bearing Sil-Grt gneiss, and granite were used to determine protolith and metamorphic ages of the khondalite-series rocks. Results of 315 detrital zircon grains indicate five age populations: 2410-2550 Ma, 2162 Ma, 2047-2099 Ma, 1950-1993 Ma, and 1866 Ma. CL investigation reveals that zircon grains of most samples are rounded, unzoned with low Th/U, indicating a metamorphic origin, whereas quite a few grains in some rocks are characterized by magmatic oscillatory zoning and comparatively high Th/U, and are typically overgrown by metamorphic, low CL rims with low Th/U. Three samples of Sil-Bt-Grt gneiss record oldest ages of 2550-2480 Ma, suggesting an Archaean/early Palaeoproterozoic provenance for the Jining Complex. Ages of 2162-2047 Ma are interpreted as the metamorphic modified inherited source of supercrustal protoliths of the khondalite-series rocks. The khondalite depositional age is defined as 2228-2027 Ma by concordant ages obtained in this research. The Sil-Ksp-Grt vein and the granite have single population ages of 1985 ± 28 Ma and 1957 ± 19 Ma, respectively, and are inferred to record the same metamorphic event, i.e. formation of the Khondalite Belt within the Western Block owing to the collision of the north Yinshan and the south Ordos terranes. The Sil-Grt-K-Fsp mylonite yields a single group age of 1866 ± 22 Ma, which may date final suturing of the Eastern Block and the Western Block and stabilization of the NCC. © 2011 Taylor & Francis.
Persistent Identifierhttp://hdl.handle.net/10722/139173
ISSN
2015 Impact Factor: 2.365
2015 SCImago Journal Rankings: 1.248
ISI Accession Number ID
Funding AgencyGrant Number
National Natural Science Foundation of China40872122
40730315
Hong Kong RGCHKU7066/07P
Funding Information:

We thank Dr Xiaoping Xia and Dr Touping Peng for help with U-Pb dating and processing, and Linli Chen for CL analyses. This study was supported by the National Natural Science Foundation of China 40872122, Key Project of the National Natural Science Foundation of China 40730315 and Hong Kong RGC grant HKU7066/07P.

References

 

DC FieldValueLanguage
dc.contributor.authorLi, XPen_HK
dc.contributor.authorYang, Zen_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorGrapes, Ren_HK
dc.contributor.authorGuo, Jen_HK
dc.date.accessioned2011-09-23T05:46:20Z-
dc.date.available2011-09-23T05:46:20Z-
dc.date.issued2011en_HK
dc.identifier.citationInternational Geology Review, 2011, v. 53 n. 10, p. 1194-1211en_HK
dc.identifier.issn0020-6814en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139173-
dc.description.abstractA belt of khondalite-series rocks in the Western Block of the North China craton (NCC) are considered to represent products of the collision between the north Yinshan and the south Ordos terranes before final amalgamation of the NCC basement. The Jining Complex of Inner Mongolia occurs in the eastern part of the Khondalite Belt and is crosscut by the Trans-North China Orogen. Khondalite rocks of the Jining Complex mainly comprise sillimanite-garnet gneiss, garnet/sillimanite-bearing granite, massive porphyritic granite, garnet quartzite, calc-silicate, and marble with minor felsic gneiss and mafic granulite. LA-ICP-MS, U-Pb dating and cathodoluminescence (CL) image analysis of zircons from five rocks from the complex, i.e. Sil-Bt-Grt leptynite gneiss, Spl-Sil-Ksp-Grt vein in (Crd)-Sil-Grt gneiss, Sil-Grt-K-Fsp mylonite from a shear zone, Crd-bearing Sil-Grt gneiss, and granite were used to determine protolith and metamorphic ages of the khondalite-series rocks. Results of 315 detrital zircon grains indicate five age populations: 2410-2550 Ma, 2162 Ma, 2047-2099 Ma, 1950-1993 Ma, and 1866 Ma. CL investigation reveals that zircon grains of most samples are rounded, unzoned with low Th/U, indicating a metamorphic origin, whereas quite a few grains in some rocks are characterized by magmatic oscillatory zoning and comparatively high Th/U, and are typically overgrown by metamorphic, low CL rims with low Th/U. Three samples of Sil-Bt-Grt gneiss record oldest ages of 2550-2480 Ma, suggesting an Archaean/early Palaeoproterozoic provenance for the Jining Complex. Ages of 2162-2047 Ma are interpreted as the metamorphic modified inherited source of supercrustal protoliths of the khondalite-series rocks. The khondalite depositional age is defined as 2228-2027 Ma by concordant ages obtained in this research. The Sil-Ksp-Grt vein and the granite have single population ages of 1985 ± 28 Ma and 1957 ± 19 Ma, respectively, and are inferred to record the same metamorphic event, i.e. formation of the Khondalite Belt within the Western Block owing to the collision of the north Yinshan and the south Ordos terranes. The Sil-Grt-K-Fsp mylonite yields a single group age of 1866 ± 22 Ma, which may date final suturing of the Eastern Block and the Western Block and stabilization of the NCC. © 2011 Taylor & Francis.en_HK
dc.languageengen_US
dc.publisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/TIGRen_HK
dc.relation.ispartofInternational Geology Reviewen_HK
dc.subjectdetrital zirconsen_HK
dc.subjectJining Complexen_HK
dc.subjectkhondalitesen_HK
dc.subjectLA-ICP-MSen_HK
dc.subjectNorth China cratonen_HK
dc.subjectU-Pb agesen_HK
dc.titleGeochronology of khondalite-series rocks of the Jining Complex: Confirmation of depositional age and tectonometamorphic evolution of the North China cratonen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0020-6814&volume=53&issue=10&spage=1194&epage=1211&date=2011&atitle=Geochronology+of+khondalite-series+rocks+of+the+Jining+Complex:+confirmation+of+depositional+age+and+tectonometamorphic+evolution+of+the+North+China+craton-
dc.identifier.emailZhao, G:gzhao@hkucc.hku.hken_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1080/00206810903548984en_HK
dc.identifier.scopuseid_2-s2.0-79957451480en_HK
dc.identifier.hkuros193886en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79957451480&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume53en_HK
dc.identifier.issue10en_HK
dc.identifier.spage1194en_HK
dc.identifier.epage1211en_HK
dc.identifier.isiWOS:000290397600005-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLi, XP=35762863200en_HK
dc.identifier.scopusauthoridYang, Z=39763598200en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridGrapes, R=7003870932en_HK
dc.identifier.scopusauthoridGuo, J=35368525900en_HK

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