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Article: Geochemistry and Petrogenesis of Neoarchean Metamorphic Mafic Rocks in the Wutai Complex

TitleGeochemistry and Petrogenesis of Neoarchean Metamorphic Mafic Rocks in the Wutai Complex
Authors
KeywordsMetamorphic mafic rocks
Geochemistry
Petrogenesis
Wutai Complex
Central tectonic zone
Issue Date2006
PublisherWiley-Blackwell Publishing Asia. The Journal's web site is located at http://www.wiley.com/WileyCDA/WileyTitle/productCd-ACGS.html
Citation
Acta Geologica Sinica (English Edition) , 2006, v. 80 n. 6, p. 899-911 How to Cite?
AbstractNeoarchean metamorphic mafic rocks in the lower and the middle Wutai Complex mainly comprise metamorphic gabbros, amphibolites and chlorite schists. They can be subdivided into three groups according to chondrite normalized REE patterns. Rocks in Group #1 are characterized by nearly flat REE patterns (Lan/Ybn=0.86-1.3), the lowest total REEs (29–52 ppm), and weak negative to positive Eu anomalies (Eun/Eun*=0.84-1.02), nearly flat primitive mantle normalized patterns and strong negative Zr(Hf) anomalies. Their geochemical characteristics in REEs and trace elements are similar to those of ocean plateau tholeiite, which imply that this group of rocks can represent remnants of Archean oceanic crust derived from a mantle plume. Rocks in Group #2 are characterized by moderate total REEs (34–116 ppm), LREE-enriched (Lan/Ybn=1.76-4.34) chondrite normalized REE patterns with weak Eu anomalies (Eun/Eun*=0.76-1.16), and negative Nb, Ta, Zr(Hf), Ti anomalies in the primitive mantle normalized spider diagram. The REE and trace element characteristics indicate that they represent arc magmas originating from a sub-arc mantle wedge metasomatized by slab-derived fluids. Rocks in Group #3 are characterized by the highest total REEs (61–192 ppm), the strongest LREEs enrichment (Lan/Ybn=7.12–16) with slightly negative Eu anomalies (Eun/Eun*=0.81-0.95) in the chondrite normalized diagram. In the primitive mantle normalized diagram, these rocks are characterized by large negative anomalies in Nb, Ta, Ti, negative to no Zr anomalies. They represent arc magmas originating from a sub-arc mantle wedge enriched in slab-derived melts. The three groups of rocks imply that the formation of the Neoarchean Wutai Complex is related to mantle plumes and island-arc interaction.
Persistent Identifierhttp://hdl.handle.net/10722/72952
ISSN
2015 Impact Factor: 1.996

 

DC FieldValueLanguage
dc.contributor.authorLu, Yen_HK
dc.contributor.authorLiu, Sen_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorLi, Qen_HK
dc.contributor.authorZhang, Jen_HK
dc.contributor.authorLiu, Cen_HK
dc.contributor.authorPark, KHen_HK
dc.contributor.authorSong, YSen_HK
dc.date.accessioned2010-09-06T06:46:39Z-
dc.date.available2010-09-06T06:46:39Z-
dc.date.issued2006en_HK
dc.identifier.citationActa Geologica Sinica (English Edition) , 2006, v. 80 n. 6, p. 899-911en_HK
dc.identifier.issn1000-9515en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72952-
dc.description.abstractNeoarchean metamorphic mafic rocks in the lower and the middle Wutai Complex mainly comprise metamorphic gabbros, amphibolites and chlorite schists. They can be subdivided into three groups according to chondrite normalized REE patterns. Rocks in Group #1 are characterized by nearly flat REE patterns (Lan/Ybn=0.86-1.3), the lowest total REEs (29–52 ppm), and weak negative to positive Eu anomalies (Eun/Eun*=0.84-1.02), nearly flat primitive mantle normalized patterns and strong negative Zr(Hf) anomalies. Their geochemical characteristics in REEs and trace elements are similar to those of ocean plateau tholeiite, which imply that this group of rocks can represent remnants of Archean oceanic crust derived from a mantle plume. Rocks in Group #2 are characterized by moderate total REEs (34–116 ppm), LREE-enriched (Lan/Ybn=1.76-4.34) chondrite normalized REE patterns with weak Eu anomalies (Eun/Eun*=0.76-1.16), and negative Nb, Ta, Zr(Hf), Ti anomalies in the primitive mantle normalized spider diagram. The REE and trace element characteristics indicate that they represent arc magmas originating from a sub-arc mantle wedge metasomatized by slab-derived fluids. Rocks in Group #3 are characterized by the highest total REEs (61–192 ppm), the strongest LREEs enrichment (Lan/Ybn=7.12–16) with slightly negative Eu anomalies (Eun/Eun*=0.81-0.95) in the chondrite normalized diagram. In the primitive mantle normalized diagram, these rocks are characterized by large negative anomalies in Nb, Ta, Ti, negative to no Zr anomalies. They represent arc magmas originating from a sub-arc mantle wedge enriched in slab-derived melts. The three groups of rocks imply that the formation of the Neoarchean Wutai Complex is related to mantle plumes and island-arc interaction.-
dc.languageengen_HK
dc.publisherWiley-Blackwell Publishing Asia. The Journal's web site is located at http://www.wiley.com/WileyCDA/WileyTitle/productCd-ACGS.htmlen_HK
dc.relation.ispartofActa Geologica Sinica (English Edition)en_HK
dc.rightsThe definitive version is available at www3.interscience.wiley.com-
dc.subjectMetamorphic mafic rocks-
dc.subjectGeochemistry-
dc.subjectPetrogenesis-
dc.subjectWutai Complex-
dc.subjectCentral tectonic zone-
dc.titleGeochemistry and Petrogenesis of Neoarchean Metamorphic Mafic Rocks in the Wutai Complexen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1000-9515&volume=80&spage=899&epage=911&date=2006&atitle=Paleoproterozoic+convergence+of+the+Trans-North+China+Orogen:Evidence+from+metamorphic+volcanic+rocks+in+the+Luliang+Complexen_HK
dc.identifier.emailZhao, G: gzhao@hkucc.hku.hken_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.identifier.doi10.1111/j.1755-6724.2006.tb00311.x-
dc.identifier.hkuros127563en_HK
dc.identifier.volume80-
dc.identifier.issue6-
dc.identifier.spage899-
dc.identifier.epage911-
dc.publisher.placeAustralia-

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