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Article: Geochemistry and geochronology of high-grade rocks from the Grove Mountains, East Antarctica: Evidence for an Early Neoproterozoic basement metamorphosed during a single Late Neoproterozoic/Cambrian tectonic cycle

TitleGeochemistry and geochronology of high-grade rocks from the Grove Mountains, East Antarctica: Evidence for an Early Neoproterozoic basement metamorphosed during a single Late Neoproterozoic/Cambrian tectonic cycle
Authors
KeywordsEarly Neoproterozoic
East Antarctica
Grove Mountains
Late Neoproterozoic/Cambrian
Mafic-Felsic Intrusion
Prydz Belt
Single Metamorphic Cycle
Issue Date2007
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamres
Citation
Precambrian Research, 2007, v. 158 n. 1-2, p. 93-118 How to Cite?
AbstractThe Grove Mountains of East Antarctica are an inland continuation of the Prydz Belt. The high-grade metamorphic complex in this area is composed of felsic orthogneisses and mafic granulites, with minor paragneisses and calc-silicate rocks. U-Pb zircon analyses using SHRIMP and LA-ICP-MS techniques reveal that the protoliths of mafic granulites and felsic orthogneisses were emplaced during a short time interval of ca. 920-910 Ma. Mafic granulites can be divided into low- and high-Ti groups. They have initial εNd values [εNd(T)] ranging from +0.8 to -1.9. TiO2 is positively correlated with FeOt/MgO and La/Nb ratios, whereas it shows a negative correlation with εNd(T) values, indicating that the petrogenesis of their protoliths involved partial melting of a weakly enriched subcontinental lithospheric mantle and fractional crystallization of the magma accompanied by minor crustal contamination. Felsic orthogneisses have an affinity of A2-type granites, characterized by enrichment in REE, Y, Zr, Th and Ga and high Ga/Al and Y/Nb ratios. Most of them have εNd(T) values of -0.7 to -3.5 and Nd depleted mantle model ages (TDM) of 1.76-1.65 Ga, and a few have low εNd(T) values of -10.4 to -10.6 and old TDM of 2.46-2.27 Ga, reflecting a heterogeneity in their source region. Their protoliths were probably produced by high-temperature partial melting of tonalitic-granodioritic rocks triggered by the underplating of mantle-derived mafic magma during post-orogenic extension. U-Pb analyses also reveal a metamorphic age of ca. 2050 Ma from detrital zircons in a paragneiss, suggesting that the sedimentary materials of the paragneiss may have come from an as yet undiscovered Early Paleoproterozoic orogen of unknown provenance. Voluminous mafic-felsic intrusives and a small amount of sedimentary rocks constitute an Early Neoproterozoic basement of the Grove Mountains. Subsequently, this basement experienced only a single Late Neoproterozoic/Cambrian metamorphic cycle at ca. 550-535 Ma. The available data indicate that the Prydz Belt is a collage of multiple basement terranes and each of them has a distinct tectonic evolution. This supports the suggestion that the Prydz Belt may represent a Late Neoproterozoic/Cambrian collisional orogen that resulted in the final phase of the Gondwana assembly. © 2007 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151213
ISSN
2015 Impact Factor: 4.037
2015 SCImago Journal Rankings: 3.214
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLiu, Xen_US
dc.contributor.authorJahn, BMen_US
dc.contributor.authorZhao, Yen_US
dc.contributor.authorZhao, Gen_US
dc.contributor.authorLiu, Xen_US
dc.date.accessioned2012-06-26T06:18:45Z-
dc.date.available2012-06-26T06:18:45Z-
dc.date.issued2007en_US
dc.identifier.citationPrecambrian Research, 2007, v. 158 n. 1-2, p. 93-118en_US
dc.identifier.issn0301-9268en_US
dc.identifier.urihttp://hdl.handle.net/10722/151213-
dc.description.abstractThe Grove Mountains of East Antarctica are an inland continuation of the Prydz Belt. The high-grade metamorphic complex in this area is composed of felsic orthogneisses and mafic granulites, with minor paragneisses and calc-silicate rocks. U-Pb zircon analyses using SHRIMP and LA-ICP-MS techniques reveal that the protoliths of mafic granulites and felsic orthogneisses were emplaced during a short time interval of ca. 920-910 Ma. Mafic granulites can be divided into low- and high-Ti groups. They have initial εNd values [εNd(T)] ranging from +0.8 to -1.9. TiO2 is positively correlated with FeOt/MgO and La/Nb ratios, whereas it shows a negative correlation with εNd(T) values, indicating that the petrogenesis of their protoliths involved partial melting of a weakly enriched subcontinental lithospheric mantle and fractional crystallization of the magma accompanied by minor crustal contamination. Felsic orthogneisses have an affinity of A2-type granites, characterized by enrichment in REE, Y, Zr, Th and Ga and high Ga/Al and Y/Nb ratios. Most of them have εNd(T) values of -0.7 to -3.5 and Nd depleted mantle model ages (TDM) of 1.76-1.65 Ga, and a few have low εNd(T) values of -10.4 to -10.6 and old TDM of 2.46-2.27 Ga, reflecting a heterogeneity in their source region. Their protoliths were probably produced by high-temperature partial melting of tonalitic-granodioritic rocks triggered by the underplating of mantle-derived mafic magma during post-orogenic extension. U-Pb analyses also reveal a metamorphic age of ca. 2050 Ma from detrital zircons in a paragneiss, suggesting that the sedimentary materials of the paragneiss may have come from an as yet undiscovered Early Paleoproterozoic orogen of unknown provenance. Voluminous mafic-felsic intrusives and a small amount of sedimentary rocks constitute an Early Neoproterozoic basement of the Grove Mountains. Subsequently, this basement experienced only a single Late Neoproterozoic/Cambrian metamorphic cycle at ca. 550-535 Ma. The available data indicate that the Prydz Belt is a collage of multiple basement terranes and each of them has a distinct tectonic evolution. This supports the suggestion that the Prydz Belt may represent a Late Neoproterozoic/Cambrian collisional orogen that resulted in the final phase of the Gondwana assembly. © 2007 Elsevier B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamresen_US
dc.relation.ispartofPrecambrian Researchen_US
dc.rightsPrecambrian Research. Copyright © Elsevier BV.-
dc.subjectEarly Neoproterozoicen_US
dc.subjectEast Antarcticaen_US
dc.subjectGrove Mountainsen_US
dc.subjectLate Neoproterozoic/Cambrianen_US
dc.subjectMafic-Felsic Intrusionen_US
dc.subjectPrydz Belten_US
dc.subjectSingle Metamorphic Cycleen_US
dc.titleGeochemistry and geochronology of high-grade rocks from the Grove Mountains, East Antarctica: Evidence for an Early Neoproterozoic basement metamorphosed during a single Late Neoproterozoic/Cambrian tectonic cycleen_US
dc.typeArticleen_US
dc.identifier.emailLiu, X: liuxchqw@yahoo.com.cnen_US
dc.identifier.emailZhao, G: gzhao@hkucc.hku.hk-
dc.identifier.authorityZhao, G=rp00842en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.precamres.2007.04.005en_US
dc.identifier.scopuseid_2-s2.0-34547800112en_US
dc.identifier.hkuros144323-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34547800112&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume158en_US
dc.identifier.issue1-2en_US
dc.identifier.spage93en_US
dc.identifier.epage118en_US
dc.identifier.isiWOS:000249482900005-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridLiu, X=34975560500en_US
dc.identifier.scopusauthoridJahn, BM=7006657468en_US
dc.identifier.scopusauthoridZhao, Y=24831241400en_US
dc.identifier.scopusauthoridZhao, G=7403296321en_US
dc.identifier.scopusauthoridLiu, X=35275559700en_US

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