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Article: Melt/mantle interaction and melt evolution in the Sartohay high-Al chromite deposits of the Dalabute ophiolite (NW China)

TitleMelt/mantle interaction and melt evolution in the Sartohay high-Al chromite deposits of the Dalabute ophiolite (NW China)
Authors
KeywordsHigh-Al podiform chromite deposit
Melt/mantle interaction
NW China
Paleozoic aphiolite
Peridotite
Troctolite
Issue Date2001
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaes
Citation
Journal Of Asian Earth Sciences, 2001, v. 19 n. 4, p. 517-534 How to Cite?
AbstractThe Sartohay block of the Dalabute ophiolite consists chiefly of mantle harzburgite and lherzolite with minor dunite. These rocks host voluminous chromite deposits with lenticular or vein-like shapes. The podiform chromitites are associated with, and cross-cut by, numerous troctolite dykes. Chromite in the chromitites has Al 2O 3 (23-31 wt%). TiO 2 (0.29-0.44 wt%). and Cr 2O 3 contents (<45 wt%) with Cr#s [100Cr/(Cr + Al)] (<60), typical of high-Al chromite deposits. The host peridotites in Sartohay have been texturally and geochemically modified by magmas from which the high-Al chromitites and mafic dykes formed. Dunites commonly envelop the podiform chromite bodies and show transitional contacts with the peridotites. Some of the peridotites and chromitites contain plagioclase that crystallized from impregnated melts. The dunite locally grades into troctolite with increasing plagioclase contents. As a result of melt impregnation, peridotites and dunites show variable Ca and Al contents and LREE enrichment. The parental magma of the chromitites was likely tholeiitic in composition, derived from partial melting of the asthenospheric mantle in a rising diapir. The interaction between this magma and pre-existing lithospheric mantle, composed of depleted lherzolite, would have formed a more silicic, tholeiitic magma from which high-Al chromitites crystallized. During this interaction, harzburgite and dunite were depleted in modal pyroxene and enriched in some incompatible elements (such as Al, Ca and LREE) due to melt impregnation. © 2001 Elsevier Science Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151058
ISSN
2015 Impact Factor: 2.647
2015 SCImago Journal Rankings: 1.393
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorRobinson, PTen_HK
dc.contributor.authorMalpas, Jen_HK
dc.contributor.authorAitchison, Jen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorBai, WJen_HK
dc.contributor.authorHu, XFen_HK
dc.contributor.authorYang, JSen_HK
dc.date.accessioned2012-06-26T06:16:38Z-
dc.date.available2012-06-26T06:16:38Z-
dc.date.issued2001en_HK
dc.identifier.citationJournal Of Asian Earth Sciences, 2001, v. 19 n. 4, p. 517-534en_HK
dc.identifier.issn1367-9120en_HK
dc.identifier.urihttp://hdl.handle.net/10722/151058-
dc.description.abstractThe Sartohay block of the Dalabute ophiolite consists chiefly of mantle harzburgite and lherzolite with minor dunite. These rocks host voluminous chromite deposits with lenticular or vein-like shapes. The podiform chromitites are associated with, and cross-cut by, numerous troctolite dykes. Chromite in the chromitites has Al 2O 3 (23-31 wt%). TiO 2 (0.29-0.44 wt%). and Cr 2O 3 contents (<45 wt%) with Cr#s [100Cr/(Cr + Al)] (<60), typical of high-Al chromite deposits. The host peridotites in Sartohay have been texturally and geochemically modified by magmas from which the high-Al chromitites and mafic dykes formed. Dunites commonly envelop the podiform chromite bodies and show transitional contacts with the peridotites. Some of the peridotites and chromitites contain plagioclase that crystallized from impregnated melts. The dunite locally grades into troctolite with increasing plagioclase contents. As a result of melt impregnation, peridotites and dunites show variable Ca and Al contents and LREE enrichment. The parental magma of the chromitites was likely tholeiitic in composition, derived from partial melting of the asthenospheric mantle in a rising diapir. The interaction between this magma and pre-existing lithospheric mantle, composed of depleted lherzolite, would have formed a more silicic, tholeiitic magma from which high-Al chromitites crystallized. During this interaction, harzburgite and dunite were depleted in modal pyroxene and enriched in some incompatible elements (such as Al, Ca and LREE) due to melt impregnation. © 2001 Elsevier Science Ltd. All rights reserved.en_HK
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaesen_HK
dc.relation.ispartofJournal of Asian Earth Sciencesen_HK
dc.subjectHigh-Al podiform chromite depositen_HK
dc.subjectMelt/mantle interactionen_HK
dc.subjectNW Chinaen_HK
dc.subjectPaleozoic aphioliteen_HK
dc.subjectPeridotiteen_HK
dc.subjectTroctoliteen_HK
dc.titleMelt/mantle interaction and melt evolution in the Sartohay high-Al chromite deposits of the Dalabute ophiolite (NW China)en_HK
dc.typeArticleen_HK
dc.identifier.emailZhou, MF: mfzhou@hkucc.hku.hken_HK
dc.identifier.emailMalpas, J: jgmalpas@hku.hken_HK
dc.identifier.emailAitchison, J: jona@hku.hken_HK
dc.identifier.emailSun, M: minsun@hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.identifier.authorityMalpas, J=rp00059en_HK
dc.identifier.authorityAitchison, J=rp00658en_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S1367-9120(00)00048-1en_HK
dc.identifier.scopuseid_2-s2.0-0035010877en_HK
dc.identifier.hkuros57576-
dc.identifier.hkuros58107-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0035010877&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume19en_HK
dc.identifier.issue4en_HK
dc.identifier.spage517en_HK
dc.identifier.epage534en_HK
dc.identifier.isiWOS:000168861300007-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridRobinson, PT=7403720506en_HK
dc.identifier.scopusauthoridMalpas, J=7006136845en_HK
dc.identifier.scopusauthoridAitchison, J=7102533858en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridBai, WJ=9271474700en_HK
dc.identifier.scopusauthoridHu, XF=55496226800en_HK
dc.identifier.scopusauthoridYang, JS=48961517100en_HK

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