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Article: Mineral compositional constraints on petrogenesis and oxide ore genesis of the late Permian Panzhihua layered gabbroic intrusion, SW China

TitleMineral compositional constraints on petrogenesis and oxide ore genesis of the late Permian Panzhihua layered gabbroic intrusion, SW China
Authors
KeywordsFe-Ti oxide ore
Layered intrusion
Mineral composition
Panzhihua
Issue Date2009
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2009, v. 110 n. 1-4, p. 199-214 How to Cite?
AbstractA systematic study of mineral compositions has been carried out on stratigraphic sections through the Panzhihua intrusion, a layered gabbroic sill of late Permian age that hosts significant magmatic Fe-Ti-V oxide deposits in the Emeishan large igneous province, SW China. The intrusion, which is ∼ 19 km long and ∼ 2 km thick, is divided into a Marginal zone (MGZ), Lower zone (LZ), Middle zone (sub-zones MZa and MZb) and Upper zone (UZ) from the base upwards. Compositions of the most primitive cumulus olivine (Fo 81) and plagioclase (An 73) found in the intrusion suggest that the parental magma was similar to the Mg-rich end-member of the coeval high-Ti basalts in the region. Two reversals in terms of mineral compositions are found in the intrusion, one in the lower MZa and the other at the transition between the MZb and the UZ. The first reversal is marked by a gradual increase in the An content of plagioclase (∼ An 60 to ∼ An 70) over a ∼ 100 m vertical interval. The other is characterized by abrupt changes in the compositions of olivine (∼ Fo 28 to ∼ Fo 70), clinopyroxene (Mg# = ∼ 51 to 75) and plagioclase (∼ An 24 to ∼ An 51) over a < 20 m vertical interval. These suggest that the Panzhihua intrusion opened at least twice for recharge of more primitive magmas. Strong depletion of incompatible trace elements, such as Zr, in the cumulate sequence without corresponding enrichment in any border series is suggested to be evidence for significant loss of residual liquid at a late-stage during solidification of the intrusion. Compared to other well-studied layered intrusions, the Panzhihua intrusion contains Fe-Ti oxides crystallized at a high temperature, consistent with evidence obtained in earlier studies. Early appearance of liquidus Fe-Ti oxides in the Panzhihua magma is most likely a combined effect of a rather high degree of initial oxidation and elevated volatile fugacity. © 2009 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/58664
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
Funding AgencyGrant Number
Research Grant Council, Hong KongHKU7065/06P
Chinese 9732007CB411401
NSF0710910
40534020
Ministry of Education of China111-B07011
Funding Information:

This paper is part of KNP's PhD dissertation at The University of Hong Kong. KNP is indebted to Prof Donald Lindsley who not only shared his expertise on Fe-Ti oxides and QUILF but also served in the examination committee of KNP's thesis defence. We also thank Yu-Xiao Ma and Jun-Hong Zhao for field assistance. This study was benefited from constructive reviews by Tony Morse and Grant Cawthorn, and comments by the editor Andrew Kerr. Financial support of this study was obtained from the Research Grant Council, Hong Kong (HKU7065/06P) and a Chinese 973 project (2007CB411401). Research at Indiana University on the genesis of magmatic ore deposits was supported by NSF Grant 0710910, NSFC Grant 40534020, and the Ministry of Education of China (Project 111-B07011).

References

 

DC FieldValueLanguage
dc.contributor.authorPang, KNen_HK
dc.contributor.authorLi, Cen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorRipley, EMen_HK
dc.date.accessioned2010-05-31T03:34:38Z-
dc.date.available2010-05-31T03:34:38Z-
dc.date.issued2009en_HK
dc.identifier.citationLithos, 2009, v. 110 n. 1-4, p. 199-214en_HK
dc.identifier.issn0024-4937en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58664-
dc.description.abstractA systematic study of mineral compositions has been carried out on stratigraphic sections through the Panzhihua intrusion, a layered gabbroic sill of late Permian age that hosts significant magmatic Fe-Ti-V oxide deposits in the Emeishan large igneous province, SW China. The intrusion, which is ∼ 19 km long and ∼ 2 km thick, is divided into a Marginal zone (MGZ), Lower zone (LZ), Middle zone (sub-zones MZa and MZb) and Upper zone (UZ) from the base upwards. Compositions of the most primitive cumulus olivine (Fo 81) and plagioclase (An 73) found in the intrusion suggest that the parental magma was similar to the Mg-rich end-member of the coeval high-Ti basalts in the region. Two reversals in terms of mineral compositions are found in the intrusion, one in the lower MZa and the other at the transition between the MZb and the UZ. The first reversal is marked by a gradual increase in the An content of plagioclase (∼ An 60 to ∼ An 70) over a ∼ 100 m vertical interval. The other is characterized by abrupt changes in the compositions of olivine (∼ Fo 28 to ∼ Fo 70), clinopyroxene (Mg# = ∼ 51 to 75) and plagioclase (∼ An 24 to ∼ An 51) over a < 20 m vertical interval. These suggest that the Panzhihua intrusion opened at least twice for recharge of more primitive magmas. Strong depletion of incompatible trace elements, such as Zr, in the cumulate sequence without corresponding enrichment in any border series is suggested to be evidence for significant loss of residual liquid at a late-stage during solidification of the intrusion. Compared to other well-studied layered intrusions, the Panzhihua intrusion contains Fe-Ti oxides crystallized at a high temperature, consistent with evidence obtained in earlier studies. Early appearance of liquidus Fe-Ti oxides in the Panzhihua magma is most likely a combined effect of a rather high degree of initial oxidation and elevated volatile fugacity. © 2009 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithosen_HK
dc.relation.ispartofLithosen_HK
dc.rightsLithos. Copyright © Elsevier BV.en_HK
dc.subjectFe-Ti oxide oreen_HK
dc.subjectLayered intrusionen_HK
dc.subjectMineral compositionen_HK
dc.subjectPanzhihuaen_HK
dc.titleMineral compositional constraints on petrogenesis and oxide ore genesis of the late Permian Panzhihua layered gabbroic intrusion, SW Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0024-4937&volume=110&issue=1-4&spage=199&epage=214&date=2009&atitle=Mineral+compositional+constraints+on+petrogenesis+and+oxide+ore+genesis+of+the+late+Permian+Panzhihua+layered+gabbroic+intrusion,+SW+Chinaen_HK
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.lithos.2009.01.007en_HK
dc.identifier.scopuseid_2-s2.0-67349186669en_HK
dc.identifier.hkuros167325en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-67349186669&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume110en_HK
dc.identifier.issue1-4en_HK
dc.identifier.spage199en_HK
dc.identifier.epage214en_HK
dc.identifier.isiWOS:000266541500014-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridPang, KN=23493522200en_HK
dc.identifier.scopusauthoridLi, C=8092856900en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridRipley, EM=7007165825en_HK

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