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Authordc.contributor.authorEslami, Alireza 
Authordc.contributor.authorGhaderi, Majid 
Authordc.contributor.authorGriffin, William L. 
Authordc.contributor.authorGain, Sarah 
Authordc.contributor.authorGrieco, Giovanni 
Authordc.contributor.authorGonzález Jiménez, José 
Admission datedc.date.accessioned2016-01-29T14:56:05Z
Available datedc.date.available2016-01-29T14:56:05Z
Publication datedc.date.issued2015
Cita de ítemdc.identifier.citationOfioliti Volumen: 40 Número: 2 Páginas: 91-106 (2015)en_US
Identifierdc.identifier.otherDOI: 10.4454/ofioliti.v40i2.437
Identifierdc.identifier.urihttps://repositorio.uchile.cl/handle/2250/136910
General notedc.descriptionArtículo de publicación ISIen_US
General notedc.descriptionSin acceso a texto completo
Abstractdc.description.abstractPodiform bodies of high-Cr chromitite in the Cheshmeh-Bid chromitite deposit are located at the mantle-lower crust transition zone (MTZ) of the Late Cretaceous Khajeh-Jamali ophiolitic massifs, Iran. The unaltered core of chromian spinels has retained their magmatic composition but post magmatic sub-solidus re-equilibration changed significantly minor and trace elements (Ga, Ti, Ni, Zn, Co, Mn, V and Sc) composition. Minor disseminated chromites also occur and show lower chromite/silicate ratios than massive chromitites and were much more affected by the subsolidus mobility of minor and trace elements. Using the composition of the unaltered chromites preserved in the cores we have estimated the Al content and Fe/Mg ratios of their potential parental melts. The results of our computations show that Cheshmeh-Bid massive chromitites were crystallized from supra-subduction zone melts with boninitic affinity, consistent with the fact that minor and trace elements distributions in the studied chromite match well with that of chromian spinel from boninite lavas. The chromitites would have formed as a result of the reaction of migrating boninitic melts within host peridotite close to the MTZ in a supra-subduction zone setting. Post-magmatic processes (i.e., serpentinization) have only partially obliterated the magmatic fingerprints in some of the chromite grains.en_US
Lenguagedc.language.isoenen_US
Publisherdc.publisherOfiolitien_US
Keywordsdc.subjectTrace and minor elementsen_US
Keywordsdc.subjectChromititeen_US
Keywordsdc.subjectCheshmeh-Bid ore depositen_US
Keywordsdc.subjectLate Cretaceousen_US
Keywordsdc.subjectKhajeh-Jamali ophiolitic massifs. Iranen_US
Títulodc.titleMagmatic and Post-Magmatic Signatures of Chromian Spinels in Podiform Chromitites from the Cheshmeh-Bid Chromitite Deposit, Khajeh-Jamali Ophiolitic Massifs, Iranen_US
Document typedc.typeArtículo de revista


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