Alteration, oxygen isotope, and fluid inclusion study of the Meishan iron oxide–apatite deposit, SE China

Yu, Jianhua; Che, Linrui; Wang, Tiezhu

doi:10.1007/s00126-015-0577-0

Cited by 20 publications

(12 citation statements)

References 48 publications

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“…They extend for metres to tens of metres and consist of pyroxene (diopside), magnetite, quartz, and scapolite (marialite) in altered andesite lava and tuff at El Laco (Broman, Nyström, Henriquez, & Elfman, ). As stated above, alteration zoning is well developed in the Meishan deposit and consists of (a) an upper light‐coloured zone containing kaolinite, quartz, carbonate, and pyrite alteration; (b) a middle dark‐coloured zone comprising diopside, magnetite, andradite, and apatite; and (c) a lower albite‐dominated, light‐coloured zone (Yu et al, ; Yu et al, ; Figure a). The vertical thickness of the lower light‐coloured and middle dark‐coloured zones is up to ca .…”

Section: Discussionmentioning

confidence: 87%

“…The origin of Kiruna-type deposits is controversial, and various models have invoked a wide range of mineralizing processes for the formation of these deposits, from entirely magmatic models, with mineralization related to liquid immiscibility (Chen, Clark, & Kyser, 2010;Frietsch, 1978;Naslund, Henríquez, Nyström, Vivallo, & Dobbs, 2002;Nyström & Henriquez, 1994) to epigenetic-hydrothermal origins (Barton & Johnson, 1996;Hildebrand, 1986;Jami, Dunlop, & Cohen, 2007;Nabatian et al, 2014;Nabatian & Ghaderi, 2013;Sillitoe & Burrows, 2002). Using oxygen isotopes, Jonsson et al (2013) Kiruna-type iron deposits in the world (Jami et al, 2007;Rhodes & Oreskes, 1999;Yu et al, 2015).…”

Section: Hydrothermal Origin Of the Meishan Iron Oxide-apatite Depositmentioning

confidence: 99%

“…In summary, the apatites from the Meishan deposit record oxidized magma and fluid during formation of the mineral deposit. The middle dark-coloured zone (Stage 2) follows the albitization zone and includes magnetite, diopside, andradite, apatite, calcite, and anhydrite at Meishan (Chen et al, 1981;Ningwu Research Group, 1978;Yu et al, 2011;Yu et al, 2015), supporting that the middle dark-coloured zone was formed under a high oxygen fugacity. The strong Eu depletion in apatites from the Meishan deposit resulted from the fractionation of plagioclase from a parental basaltic magma.…”

Section: Oxidized Magma and Fluidmentioning

confidence: 99%

“…The geology of the Meishan deposit has previously been described by Ningwu Research Group () and Chen, Sheng, and Ai (). Based on the style of alteration, oxygen isotopes, and fluid inclusions, Yu, Che, and Wang () suggested that the magnetite–apatite ores within the Meishan deposit were related to gabbro–diorite porphyry.…”

Section: Introductionmentioning

confidence: 99%

“…and Wang (2015) suggested that the magnetite-apatite ores within the Meishan deposit were related to gabbro-diorite porphyry. Apatite, with an ideal formula of Ca 5 (PO 4 ) 3 (F, OH, Cl), occurs as an accessory mineral in diverse rock types.…”

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confidence: 99%

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Genesis of the Meishan iron oxide–apatite deposit in the Ningwu Basin, eastern China: Constraints from apatite chemistry

Chen

Che

et al. 2019

Geological Journal

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The Meishan iron oxide–apatite deposit is located in the Ningwu volcanic basin in eastern China. The deposit comprises massive and brecciated ores in the main orebody, located at the contact between a gabbro–diorite porphyry and biotite–pyroxene andesites, and sub‐economic stockwork and disseminated ores. Among the four stages of alteration and mineralization, apatite coexists with magnetite, andradite, and quartz in massive magnetite ore and occurs in disseminated magnetite ore, coexisting with magnetite, siderite (after diopside), and quartz for Stage 2 iron mineralization. Apatite is also present in the altered gabbro–diorite porphyry. The apatites from the massive and disseminated magnetite–apatite ores are fluor‐ and hydroxyl‐ variety. Those from the altered gabbro–diorite porphyry show extensive solid solution between the hydroxyl‐apatite, fluor‐apatite, and chlor‐apatite end members. The apatites at Meishan record oxidized states during formation of the mineral deposit. The SO3 contents of apatite in the Meishan deposit mostly vary from 0.4 to 1.2 wt%, with the highest value of 4.97 wt%. MnO contents in apatites from our study are less than 0.17 wt%, and most values are below detection limit, indicating that the apatite formed in a high ƒO2 magmatic–hydrothermal fluid. The strong Eu depletion in apatites at Meishan resulted from the fractionation of plagioclase. The gabbro–diorite porphyry, magnetite, and apatite show similar LREE‐enriched patterns with significant negative Eu anomalies for apatite and magnetite, and no Eu anomaly for the gabbro–diorite porphyry. The gabbro–diorite porphyry and Stage 2 apatite associated with iron mineralization have also similar primitive mantle‐normalized trace element patterns, suggesting that the mineralization was related to gabbro–diorite porphyry. The REE pattern with significant negative Eu anomalies in apatite from the Meishan deposit is comparable with that of other Kiruna‐type deposits elsewhere in the world.

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Section: Discussionmentioning

confidence: 87%