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Article: Geochemistry and petrogenesis of the Xiong'er group in the southern regions of the North China Craton

TitleGeochemistry and petrogenesis of the Xiong'er group in the southern regions of the North China Craton
Authors
KeywordsAncient subduction belt
Bimodal volcanic rocks
Geochemical characteristics
North China craton
Proterozoic
Subcontinental mantle source
Xiong'er group
Issue Date2002
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, 2002, v. 18 n. 1, p. 59-69 How to Cite?
AbstractThe volcanics of the Xiong'er Group are widely distributed in Henan, Shanxi provinces, distributed over an area of more than 60000 km 2. Most of the volcanic sequences vary from 3 km to 7 km in thickness, overlying unconformably the crystalline basement of Archean and palaeo-Proterozoic age, and covered with the middle-upper Proterozoic terrestrial clastic rocks and carbonate rocks. The volcanic rocks of the Xiong'er Group appear as a bimodal association, and rocks with SiO 2 = 62% ± are rare. The rocks are composed predomiantly of basaltic andesites and andesites, and minor dacitic-rhyolitic rocks. The mineral assemblage of mafic-intermediate rocks mainly contains pyroxene and plagioclase Amphiboles and bitotites have not been observed, suggesting an anhydraous environment of their formation. The volcanic rocks of the Xiong'er Group are rich in K 2O and FeO and poor in Al 2O 3, MgO and CaO. Geochemically the rocks are highly enriched in large-ion lithophile elements (LILE, e. g., K, Rb, Ba) and light REEs (LREE) and are depleted in high field strength elements (HFSE, e. g., Nb, Ta and Ti), probably reflecting the involvement of the continental materials during their eruption, or a derivation from an enriched lithospheric mantle source. The chemical and isotopic data presented in this paper show that the characteristics of the rocks are mainly controlled by a modified enriched mantle source with ancient subduction belt materials during the formation and consolidation of the Archean to paleo-Proterozoic continental crust. Based on the geological features of the Xiong'er Group and the underlying basement, it is suggested that the Xiong'er Group is originated from a failed trident continental rift environment.
Persistent Identifierhttp://hdl.handle.net/10722/73051
ISSN
2015 Impact Factor: 1.234
2015 SCImago Journal Rankings: 0.892
References

 

DC FieldValueLanguage
dc.contributor.authorZhao, TPen_HK
dc.contributor.authorJin, CWen_HK
dc.contributor.authorZhai, MGen_HK
dc.contributor.authorXia, Ben_HK
dc.contributor.authorZhou, MFen_HK
dc.date.accessioned2010-09-06T06:47:35Z-
dc.date.available2010-09-06T06:47:35Z-
dc.date.issued2002en_HK
dc.identifier.citationActa Petrologica Sinica, 2002, v. 18 n. 1, p. 59-69en_HK
dc.identifier.issn1000-0569en_HK
dc.identifier.urihttp://hdl.handle.net/10722/73051-
dc.description.abstractThe volcanics of the Xiong'er Group are widely distributed in Henan, Shanxi provinces, distributed over an area of more than 60000 km 2. Most of the volcanic sequences vary from 3 km to 7 km in thickness, overlying unconformably the crystalline basement of Archean and palaeo-Proterozoic age, and covered with the middle-upper Proterozoic terrestrial clastic rocks and carbonate rocks. The volcanic rocks of the Xiong'er Group appear as a bimodal association, and rocks with SiO 2 = 62% ± are rare. The rocks are composed predomiantly of basaltic andesites and andesites, and minor dacitic-rhyolitic rocks. The mineral assemblage of mafic-intermediate rocks mainly contains pyroxene and plagioclase Amphiboles and bitotites have not been observed, suggesting an anhydraous environment of their formation. The volcanic rocks of the Xiong'er Group are rich in K 2O and FeO and poor in Al 2O 3, MgO and CaO. Geochemically the rocks are highly enriched in large-ion lithophile elements (LILE, e. g., K, Rb, Ba) and light REEs (LREE) and are depleted in high field strength elements (HFSE, e. g., Nb, Ta and Ti), probably reflecting the involvement of the continental materials during their eruption, or a derivation from an enriched lithospheric mantle source. The chemical and isotopic data presented in this paper show that the characteristics of the rocks are mainly controlled by a modified enriched mantle source with ancient subduction belt materials during the formation and consolidation of the Archean to paleo-Proterozoic continental crust. Based on the geological features of the Xiong'er Group and the underlying basement, it is suggested that the Xiong'er Group is originated from a failed trident continental rift environment.en_HK
dc.languageengen_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.subjectAncient subduction belten_HK
dc.subjectBimodal volcanic rocksen_HK
dc.subjectGeochemical characteristicsen_HK
dc.subjectNorth China cratonen_HK
dc.subjectProterozoicen_HK
dc.subjectSubcontinental mantle sourceen_HK
dc.subjectXiong'er groupen_HK
dc.titleGeochemistry and petrogenesis of the Xiong'er group in the southern regions of the North China Cratonen_HK
dc.typeArticleen_HK
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0036460179en_HK
dc.identifier.hkuros71246en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0036460179&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume18en_HK
dc.identifier.issue1en_HK
dc.identifier.spage59en_HK
dc.identifier.epage69en_HK
dc.publisher.placeChinaen_HK
dc.identifier.scopusauthoridZhao, TP=7402268400en_HK
dc.identifier.scopusauthoridJin, CW=7401659228en_HK
dc.identifier.scopusauthoridZhai, MG=7007119530en_HK
dc.identifier.scopusauthoridXia, B=36112247900en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK

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