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Article: Abundant Fe-Ti oxide inclusions in olivine from the Panzhihua and Hongge layered intrusions, SW China: Evidence for early saturation of Fe-Ti oxides in ferrobasaltic magma
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TitleAbundant Fe-Ti oxide inclusions in olivine from the Panzhihua and Hongge layered intrusions, SW China: Evidence for early saturation of Fe-Ti oxides in ferrobasaltic magma
 
AuthorsPang, KN1
Li, C2
Zhou, MF1
Ripley, EM2
 
KeywordsFe-Ti Oxides
Hongge
Inclusion
Layered Intrusion
Panzhihua
Sw China
 
Issue Date2008
 
PublisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00410/index.htm
 
CitationContributions To Mineralogy And Petrology, 2008, v. 156 n. 3, p. 307-321 [How to Cite?]
DOI: http://dx.doi.org/10.1007/s00410-008-0287-z
 
AbstractAbundant Fe-Ti oxide inclusions in cumulus olivine (Fo77-81) from the Panzhihua and Hongge intrusions, Emeishan large igneous province, SW China, document the first evidence for early crystallization of Fe-Ti oxides in ferrobasaltic systems in nature. The intrusions also contain significant stratiform Fe-Ti-V oxide ores. The oxide inclusions are sub-rounded or irregular, range from ∼5 to 50 μm in diameter, and are dominated by either titanomagnetite or ilmenite. The fact that the inclusions are either titanomagnetite- or ilmenite-dominant suggests that they are trapped crystals, instead of immiscible oxide melt, formed during growth of the host olivine. The absence of other silicate phases in the inclusion-bearing olivine is difficult to reconcile with a possible xenocrystic origin of the oxide inclusions. These oxide inclusions are thus interpreted to be cumulus minerals crystallized together and trapped in olivine from the same parental magma. In addition to Fe-Ti oxides, some inclusions contain amphibole + biotite ± fluorapatite that might have formed by reaction of trapped hydrous liquid with the host olivine. Numerical modeling of high-Ti Emeishan basalts using the MELTS program successfully simulates early crystallization of olivine (∼Fo81) and Fe-Ti spinel in the presence of a moderate amount of H2O (∼1.5 wt%) under pressure and fO2 conditions generally pertinent to the Panzhihua and Hongge intrusions. The modal mineralogy of the oxide inclusions is in good agreement with the bulk compositions of the ore, as inferred from whole-rock data, in a given intrusion. This is consistent with the interpretation that the stratiform oxide ores in the intrusions formed by accumulation of Fe-Ti oxide crystals that appeared on the liquidus with olivine and clinopyroxene. © Springer-Verlag 2008.
 
ISSN0010-7999
2013 Impact Factor: 3.020
 
DOIhttp://dx.doi.org/10.1007/s00410-008-0287-z
 
ISI Accession Number IDWOS:000257721200003
 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorPang, KN
 
dc.contributor.authorLi, C
 
dc.contributor.authorZhou, MF
 
dc.contributor.authorRipley, EM
 
dc.date.accessioned2012-06-26T06:19:18Z
 
dc.date.available2012-06-26T06:19:18Z
 
dc.date.issued2008
 
dc.description.abstractAbundant Fe-Ti oxide inclusions in cumulus olivine (Fo77-81) from the Panzhihua and Hongge intrusions, Emeishan large igneous province, SW China, document the first evidence for early crystallization of Fe-Ti oxides in ferrobasaltic systems in nature. The intrusions also contain significant stratiform Fe-Ti-V oxide ores. The oxide inclusions are sub-rounded or irregular, range from ∼5 to 50 μm in diameter, and are dominated by either titanomagnetite or ilmenite. The fact that the inclusions are either titanomagnetite- or ilmenite-dominant suggests that they are trapped crystals, instead of immiscible oxide melt, formed during growth of the host olivine. The absence of other silicate phases in the inclusion-bearing olivine is difficult to reconcile with a possible xenocrystic origin of the oxide inclusions. These oxide inclusions are thus interpreted to be cumulus minerals crystallized together and trapped in olivine from the same parental magma. In addition to Fe-Ti oxides, some inclusions contain amphibole + biotite ± fluorapatite that might have formed by reaction of trapped hydrous liquid with the host olivine. Numerical modeling of high-Ti Emeishan basalts using the MELTS program successfully simulates early crystallization of olivine (∼Fo81) and Fe-Ti spinel in the presence of a moderate amount of H2O (∼1.5 wt%) under pressure and fO2 conditions generally pertinent to the Panzhihua and Hongge intrusions. The modal mineralogy of the oxide inclusions is in good agreement with the bulk compositions of the ore, as inferred from whole-rock data, in a given intrusion. This is consistent with the interpretation that the stratiform oxide ores in the intrusions formed by accumulation of Fe-Ti oxide crystals that appeared on the liquidus with olivine and clinopyroxene. © Springer-Verlag 2008.
 
dc.description.naturelink_to_subscribed_fulltext
 
dc.identifier.citationContributions To Mineralogy And Petrology, 2008, v. 156 n. 3, p. 307-321 [How to Cite?]
DOI: http://dx.doi.org/10.1007/s00410-008-0287-z
 
dc.identifier.citeulike3114751
 
dc.identifier.doihttp://dx.doi.org/10.1007/s00410-008-0287-z
 
dc.identifier.epage321
 
dc.identifier.hkuros153179
 
dc.identifier.isiWOS:000257721200003
 
dc.identifier.issn0010-7999
2013 Impact Factor: 3.020
 
dc.identifier.issue3
 
dc.identifier.scopuseid_2-s2.0-47949124490
 
dc.identifier.spage307
 
dc.identifier.urihttp://hdl.handle.net/10722/151250
 
dc.identifier.volume156
 
dc.languageeng
 
dc.publisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00410/index.htm
 
dc.publisher.placeGermany
 
dc.relation.ispartofContributions to Mineralogy and Petrology
 
dc.relation.referencesReferences in Scopus
 
dc.subjectFe-Ti Oxides
 
dc.subjectHongge
 
dc.subjectInclusion
 
dc.subjectLayered Intrusion
 
dc.subjectPanzhihua
 
dc.subjectSw China
 
dc.titleAbundant Fe-Ti oxide inclusions in olivine from the Panzhihua and Hongge layered intrusions, SW China: Evidence for early saturation of Fe-Ti oxides in ferrobasaltic magma
 
dc.typeArticle
 
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<description.abstract>Abundant Fe-Ti oxide inclusions in cumulus olivine (Fo77-81) from the Panzhihua and Hongge intrusions, Emeishan large igneous province, SW China, document the first evidence for early crystallization of Fe-Ti oxides in ferrobasaltic systems in nature. The intrusions also contain significant stratiform Fe-Ti-V oxide ores. The oxide inclusions are sub-rounded or irregular, range from &#8764;5 to 50 &#956;m in diameter, and are dominated by either titanomagnetite or ilmenite. The fact that the inclusions are either titanomagnetite- or ilmenite-dominant suggests that they are trapped crystals, instead of immiscible oxide melt, formed during growth of the host olivine. The absence of other silicate phases in the inclusion-bearing olivine is difficult to reconcile with a possible xenocrystic origin of the oxide inclusions. These oxide inclusions are thus interpreted to be cumulus minerals crystallized together and trapped in olivine from the same parental magma. In addition to Fe-Ti oxides, some inclusions contain amphibole + biotite &#177; fluorapatite that might have formed by reaction of trapped hydrous liquid with the host olivine. Numerical modeling of high-Ti Emeishan basalts using the MELTS program successfully simulates early crystallization of olivine (&#8764;Fo81) and Fe-Ti spinel in the presence of a moderate amount of H2O (&#8764;1.5 wt%) under pressure and fO2 conditions generally pertinent to the Panzhihua and Hongge intrusions. The modal mineralogy of the oxide inclusions is in good agreement with the bulk compositions of the ore, as inferred from whole-rock data, in a given intrusion. This is consistent with the interpretation that the stratiform oxide ores in the intrusions formed by accumulation of Fe-Ti oxide crystals that appeared on the liquidus with olivine and clinopyroxene. &#169; Springer-Verlag 2008.</description.abstract>
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Author Affiliations
  1. The University of Hong Kong
  2. Indiana University