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Home > Sciences & Environment > Earth sciences > Origin of the Permian Panzhihua Layered Gabbroic Intrusion and the Hosted Fe-Ti-V Oxide Deposit, Sichuan Province, SW China
Origin of the Permian Panzhihua Layered Gabbroic Intrusion and the Hosted Fe-Ti-V Oxide Deposit, Sichuan Province, SW China

Origin of the Permian Panzhihua Layered Gabbroic Intrusion and the Hosted Fe-Ti-V Oxide Deposit, Sichuan Province, SW China


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This dissertation, "Origin of the Permian Panzhihua Layered Gabbroic Intrusion and the Hosted Fe-Ti-V Oxide Deposit, Sichuan Province, SW China" by 彭君能, Kwan-Nang, Pang, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled ORIGIN OF THE PERMIAN PANZHIHUA LAYERED GABBROIC INTRUSION AND THE HOSTED Fe-Ti-V OXIDE DEPOSIT, SICHUAN PROVINCE, SW CHINA Submitted by Kwan-Nang Pang for the degree of Doctor of Philosophy at The University of Hong Kong in March 2008 The Panzhihua intrusion is one of the four large layered intrusions that host giant Fe-Ti-V oxide deposits in the Permian Emeishan large igneous province (ELIP), SW China. The intrusion is a 19-km-long and 2-km-thick gabbroic sill with olivine, clinopyroxene, plagioclase and Fe-Ti oxides apatite as cumulus minerals. It is divided into the Marginal zone (MGZ), Lower zone (LZ), Middle zone (subzones MZa and MZb) and Upper zone (UZ). Sizable concentrations of stratiform Fe-Ti oxide ores occur in the lower portions of the intrusion. The intrusion is characterized by a range of εNd = +1.5 to +2.9, generally similar to those of the high-Ti basalts and picrites of the ELIP (εNd = +1.1 to +4.8). Inversion calculations using the most primitive cumulus olivine suggest that the parental magma was relatively primitive (Mg# = 51 to 56) compared to the high-Ti basalts. Whole-rock data of the chilled microgabbro in the MGZ of the intrusion indicate a ferrobasaltic parental magma rich in Fe and Ti but poor in SiO . In addition, trace element and isotopic data do not show significant contamination of the parental magma by crustal rocks during ascent. The generally high Cu/Pd ratios and depletion in PGE of the intrusion are consistent with earlier sulfide segregation before emplacement. Mineral compositions indicate that the lower portions of the intrusion (LZ, MZa and the lower MZb) are characterized by weak upward fractionation (Fo, Mg# of cpx = 78 to 73, An ) and intermittent mineralogical 70-61 62-47reversals. The upper MZb is marked by rapid fractionation against stratigraphic level in the intrusion (Fo, Mg# of cpx = 73 to 51, An ). The 61-28 47-24 base of the UZ marks a major reversal in mineral compositions. These features indicate that the intrusion behaved mostly as an open system except in the very late stage of crystallization. The data also indicate that the magma evolved towards decreasing Ti and V, and increasing Fe/Mg and Na/Ca ratios, consistent with fractionation of magnetite gabbro. The presence of Fe-Ti oxides in the fractionating assemblage is supported by abundant Fe-Ti oxide inclusions in the relatively primitive cumulus olivine ( Fo ) in the intrusion. 81 Oxide minerals from the intrusion underwent extensive subsolidus re-equilibration and exsolution. However, the primary oxide can be reconstructed from Fe-Ti oxide ores and is suggested to be an aluminous titanomagnetite. Its similarity with the bulk composition of the ores, as inferred from whole-rock data, suggests that the accumulated oxide phase was crystalline, instead of an immiscible liquid as proposed by earlier workers. Formation of ores containing essentially Fe-Ti oxides from magnetite gabbro in the Panzhihua intrusion likely involved settling and sorting of dense oxide crystals into stratiform concentrations in the lower portions of the intrusion. Central to ore formation is a magma capable of crystallizing oxides relatively early and abundantly, possibly in the presence of H O and/or CO . 2 2 High concentration of phospho


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Product Details
  • ISBN-13: 9781361438589
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 306
  • Weight: 998 gr
  • ISBN-10: 1361438584
  • Publisher Date: 27 Jan 2017
  • Binding: Hardback
  • Language: English
  • Spine Width: 19 mm
  • Width: 216 mm


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