Flood basalt-related Fe-Ti oxide deposits in the Emeishan large igneous province, SW China

Kwan Nang Pang, Mei Fu Zhou, Liang Qi, J.g  Shellnutt, Christina Yan Wang, Donggao Zhao

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

In the Panzhihua-Xichang region (Sichuan Province, SW China), there are a number of world-class magmatic Fe-Ti oxide deposits. They are hosted as conformable masses in lower parts of layered mafic-ultramafic intrusions that are part of the end-Guadalupian (~260Ma) Emeishan large igneous province. The ore-bearing Panzhihua, Hongge, Baima, Taihe and Xinjie intrusions are spatially and temporally associated with flood basalts and granitoids in the province. New mineralogical data for Fe-Ti oxide ores in the Hongge and Baima intrusions, combined with an overview of previously published data, provide a better understanding on the formation of these enigmatic deposits. Geochemical and Sr-Nd isotopic data confirm a genetic relation between the intrusions and high-Ti Emeishan flood basalts. Parental magma compositions, estimated using the most Mg-rich cumulus olivine in the intrusions, are characterized by slight to moderate degrees of fractionation (MgO=7.2-11wt.%). Occurrences of rare Cr-bearing titanomagnetite (Cr2O3=1.2-10.7wt.%) in the Panzhihua, Hongge and Xinjie intrusions are consistent with early crystallization of Fe-Ti oxides. Oxide-silicate equilibria and low V concentration (<4800ppm) in magnetite are consistent with relatively high oxygen fugacity. Flood basalt-related origin, early Fe-Ti oxide crystallization and relatively high oxygen fugacity, are characteristic of Fe-Ti oxide deposits in the Panxi region but are fundamentally different from those hosted in highly-differentiated, upper parts of large layered intrusions (e.g. the Bushveld Complex). Similar Fe-Ti oxide deposits have not been documented in other well-studied large igneous provinces to date, but a number of Fe-Ti oxide ore occurrences worldwide are potentially similar to this type of flood basalt-related oxide deposits.

Original languageEnglish
Pages (from-to)123-136
Number of pages14
JournalLithos
Volume119
Issue number1-2
DOIs
Publication statusPublished - 2010 Jan 1

Fingerprint

large igneous province
flood basalt
Oxides
Deposits
oxide
Bearings (structural)
Ores
fugacity
Crystallization
crystallization
Ferrosoferric Oxide
Oxygen
Guadalupian
basalt
Silicates
layered intrusion
oxygen
titanomagnetite
Fractionation
cumulus

Keywords

  • Emeishan
  • Fe-Ti oxide ore
  • Flood basalt
  • Layered intrusion
  • Panxi

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

Cite this

Flood basalt-related Fe-Ti oxide deposits in the Emeishan large igneous province, SW China. / Pang, Kwan Nang; Zhou, Mei Fu; Qi, Liang;  Shellnutt, J.g; Wang, Christina Yan; Zhao, Donggao.

In: Lithos, Vol. 119, No. 1-2, 01.01.2010, p. 123-136.

Research output: Contribution to journalArticle

Pang, Kwan Nang ; Zhou, Mei Fu ; Qi, Liang ;  Shellnutt, J.g ; Wang, Christina Yan ; Zhao, Donggao. / Flood basalt-related Fe-Ti oxide deposits in the Emeishan large igneous province, SW China. In: Lithos. 2010 ; Vol. 119, No. 1-2. pp. 123-136.
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