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Article: Crystallization of podiform chromitites from silicate magmas and the formation of nodular textures

TitleCrystallization of podiform chromitites from silicate magmas and the formation of nodular textures
Authors
KeywordsMagma mingling
Melt/rock interaction
Nodular texture
Podiform chromitite
Issue Date2001
PublisherWiley-Blackwell Publishing Ltd.. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=1344-1698
Citation
Resource Geology, 2001, v. 51 n. 1, p. 1-6 How to Cite?
AbstractPodiform chromite deposits consist of numerous individual accumulations of chromite in the mantle sequences of ophiolites, suggesting formation in separate, mini-magma conduits in the upper mantle. They may show unique nodular and orbicular textures. Simple mixing of two distinct magmas, invoked for chromite deposits in layered intrusions, is inadequate to explain the formation of podiform chromite deposits. More likely, melt/rock interaction triggers the precipitation of chromite by addition of newly-formed droplets of melt to the main body of magma passing through a conduit, a process similar to that of magma mingling but involving a turbulent, moving magma so that newly-formed melt droplets behave like snowballs. These droplets concentrate chromite to form an outer shell and, while the magma is moving upwards, less dense silicate melts are squeezed out of the droplets as the shell collapses to form a nodule. Upon cooling, both orbicular and nodular textures are preserved in the chromitite.
Persistent Identifierhttp://hdl.handle.net/10722/72556
ISSN
2015 Impact Factor: 0.857
2015 SCImago Journal Rankings: 0.657
References

 

DC FieldValueLanguage
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorMalpas, Jen_HK
dc.contributor.authorRobinson, PTen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorLi, JWen_HK
dc.date.accessioned2010-09-06T06:42:57Z-
dc.date.available2010-09-06T06:42:57Z-
dc.date.issued2001en_HK
dc.identifier.citationResource Geology, 2001, v. 51 n. 1, p. 1-6en_HK
dc.identifier.issn1344-1698en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72556-
dc.description.abstractPodiform chromite deposits consist of numerous individual accumulations of chromite in the mantle sequences of ophiolites, suggesting formation in separate, mini-magma conduits in the upper mantle. They may show unique nodular and orbicular textures. Simple mixing of two distinct magmas, invoked for chromite deposits in layered intrusions, is inadequate to explain the formation of podiform chromite deposits. More likely, melt/rock interaction triggers the precipitation of chromite by addition of newly-formed droplets of melt to the main body of magma passing through a conduit, a process similar to that of magma mingling but involving a turbulent, moving magma so that newly-formed melt droplets behave like snowballs. These droplets concentrate chromite to form an outer shell and, while the magma is moving upwards, less dense silicate melts are squeezed out of the droplets as the shell collapses to form a nodule. Upon cooling, both orbicular and nodular textures are preserved in the chromitite.en_HK
dc.languageengen_HK
dc.publisherWiley-Blackwell Publishing Ltd.. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=1344-1698en_HK
dc.relation.ispartofResource Geologyen_HK
dc.rightsResource Geology. Copyright © Blackwell Publishing Ltd.en_HK
dc.subjectMagma minglingen_HK
dc.subjectMelt/rock interactionen_HK
dc.subjectNodular textureen_HK
dc.subjectPodiform chromititeen_HK
dc.titleCrystallization of podiform chromitites from silicate magmas and the formation of nodular texturesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1344-1698&volume=51&spage=1&epage=6&date=2001&atitle=Crystallization+of+podiform+chromitites+from+silicate+magmas+and+the+formation+of+nodular+texturesen_HK
dc.identifier.emailZhou, MF: mfzhou@hkucc.hku.hken_HK
dc.identifier.emailMalpas, J: jgmalpas@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.authoritySun, M=rp00780en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0010652022en_HK
dc.identifier.hkuros58110en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0010652022&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume51en_HK
dc.identifier.issue1en_HK
dc.identifier.spage1en_HK
dc.identifier.epage6en_HK
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridMalpas, J=7006136845en_HK
dc.identifier.scopusauthoridRobinson, PT=7403720506en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridLi, JW=36063037900en_HK

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