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Article: The origin of Mengyin and Fuxian diamondiferous kimberlites from the North China Craton: Implication for Palaeozoic subducted oceanic slab-mantle interaction

TitleThe origin of Mengyin and Fuxian diamondiferous kimberlites from the North China Craton: Implication for Palaeozoic subducted oceanic slab-mantle interaction
Authors
KeywordsKimberlite
North China Craton
Pge
Subducted Oceanic Slab-Mantle Interaction
Issue Date2010
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaes
Citation
Journal Of Asian Earth Sciences, 2010, v. 37 n. 5-6, p. 425-437 How to Cite?
AbstractConcentrations of major, trace, and platinum-group element (PGE) compositions were determined for a suite of the Early Palaeozoic (ca. 465 Ma) Mengyin and Fuxian diamondiferous kimberlites from the eastern North China Craton to constrain the petrogenesis of these rocks and thus the mantle processes involved in their origin. Although the Chinese kimberlites are broadly similar to the kimberlites of South Africa (McDonald et al., 1995), there are significant compositional differences between the Mengyin and the Fuxian fields. The Mengyin kimberlites are more refractory (Mg# > 87, Ni = 1207-1786, Cr = 1991-4224) and more strongly enriched in LREE ((La/Yb)N = 265-517), but have lower Pd/Ir ratios (1.26-2.08) than those of the Fuxian field. The Mengyin kimberlites possess primitive, mantle-like Sr-Nd isotopic ratios. These features suggest that the Mengyin kimberlites formed from a mixture of carbonated asthenosphere and lithospheric keel with a minor contribution from a previously subduction-dehydrated oceanic slab. In contrast, the Fuxian kimberlites are less refractory (Mg# = 80-87, Ni = 971-1411, Cr = 1483-2285), less enriched in LREE ((La/Yb)N = 45-173) and have higher Pd/Ir ratios (1.59-4.24). Their lower εNd values (εNd ∼ -2.3) and large variations in Sr isotopic compositions suggest significant involvement of hydrothermally-altered and previously subduction-dehydrated oceanic lithosphere. Thus, we consider that the formation of the two kimberlites was related to the previously dehydrated subduction of an oceanic slab beneath the North China Craton in the Palaeozoic. The subduction of Palaeo-Tethyan oceanic lithosphere in the south and/or subduction of the Mongolian Ocean lithosphere in the north could have initiated the destabilization of the eastern North China Craton. Melts released from the previously dehydrated subducted slab migrated and concentrated in regions of thermally perturbed asthenosphere and at the base of lithosphere keel, which in turn triggered the generation of kimberlitic magmas by a small degree of melting of the carbonated asthenosphere and the lithosphere keel. © 2009 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151299
ISSN
2015 Impact Factor: 2.647
2015 SCImago Journal Rankings: 1.393
ISI Accession Number ID
Funding AgencyGrant Number
Chinese Academy of Sciences (Beirenjihua)
Natural Science Foundation of China40721062
90714008
Funding Information:

This work was supported by grants from the Chinese Academy of Sciences (Beirenjihua) and the Natural Science Foundation of China (40721062 and 90714008) and. John D. Greenough, Paul Robinson and an Associate editor are thanked for their careful and constructive review that improve the paper greatly.

References

 

DC FieldValueLanguage
dc.contributor.authorZhang, HFen_US
dc.contributor.authorZhou, MFen_US
dc.contributor.authorSun, Men_US
dc.contributor.authorZhou, XHen_US
dc.date.accessioned2012-06-26T06:20:15Z-
dc.date.available2012-06-26T06:20:15Z-
dc.date.issued2010en_US
dc.identifier.citationJournal Of Asian Earth Sciences, 2010, v. 37 n. 5-6, p. 425-437en_US
dc.identifier.issn1367-9120en_US
dc.identifier.urihttp://hdl.handle.net/10722/151299-
dc.description.abstractConcentrations of major, trace, and platinum-group element (PGE) compositions were determined for a suite of the Early Palaeozoic (ca. 465 Ma) Mengyin and Fuxian diamondiferous kimberlites from the eastern North China Craton to constrain the petrogenesis of these rocks and thus the mantle processes involved in their origin. Although the Chinese kimberlites are broadly similar to the kimberlites of South Africa (McDonald et al., 1995), there are significant compositional differences between the Mengyin and the Fuxian fields. The Mengyin kimberlites are more refractory (Mg# > 87, Ni = 1207-1786, Cr = 1991-4224) and more strongly enriched in LREE ((La/Yb)N = 265-517), but have lower Pd/Ir ratios (1.26-2.08) than those of the Fuxian field. The Mengyin kimberlites possess primitive, mantle-like Sr-Nd isotopic ratios. These features suggest that the Mengyin kimberlites formed from a mixture of carbonated asthenosphere and lithospheric keel with a minor contribution from a previously subduction-dehydrated oceanic slab. In contrast, the Fuxian kimberlites are less refractory (Mg# = 80-87, Ni = 971-1411, Cr = 1483-2285), less enriched in LREE ((La/Yb)N = 45-173) and have higher Pd/Ir ratios (1.59-4.24). Their lower εNd values (εNd ∼ -2.3) and large variations in Sr isotopic compositions suggest significant involvement of hydrothermally-altered and previously subduction-dehydrated oceanic lithosphere. Thus, we consider that the formation of the two kimberlites was related to the previously dehydrated subduction of an oceanic slab beneath the North China Craton in the Palaeozoic. The subduction of Palaeo-Tethyan oceanic lithosphere in the south and/or subduction of the Mongolian Ocean lithosphere in the north could have initiated the destabilization of the eastern North China Craton. Melts released from the previously dehydrated subducted slab migrated and concentrated in regions of thermally perturbed asthenosphere and at the base of lithosphere keel, which in turn triggered the generation of kimberlitic magmas by a small degree of melting of the carbonated asthenosphere and the lithosphere keel. © 2009 Elsevier Ltd. All rights reserved.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaesen_US
dc.relation.ispartofJournal of Asian Earth Sciencesen_US
dc.subjectKimberliteen_US
dc.subjectNorth China Cratonen_US
dc.subjectPgeen_US
dc.subjectSubducted Oceanic Slab-Mantle Interactionen_US
dc.titleThe origin of Mengyin and Fuxian diamondiferous kimberlites from the North China Craton: Implication for Palaeozoic subducted oceanic slab-mantle interactionen_US
dc.typeArticleen_US
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_US
dc.identifier.emailSun, M:minsun@hku.hken_US
dc.identifier.authorityZhou, MF=rp00844en_US
dc.identifier.authoritySun, M=rp00780en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.jseaes.2009.10.006en_US
dc.identifier.scopuseid_2-s2.0-74449090199en_US
dc.identifier.hkuros177732-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-74449090199&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume37en_US
dc.identifier.issue5-6en_US
dc.identifier.spage425en_US
dc.identifier.epage437en_US
dc.identifier.isiWOS:000275289700003-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridZhang, HF=22137307400en_US
dc.identifier.scopusauthoridZhou, MF=7403506005en_US
dc.identifier.scopusauthoridSun, M=25932315800en_US
dc.identifier.scopusauthoridZhou, XH=24529257100en_US
dc.identifier.citeulike6198560-

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