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Experiments on phosphate–silicate liquid immiscibility with potential links to iron oxide apatite and nelsonite deposits

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Abstract

The formation of phosphorus–iron oxide (P–Fe) immiscible melts and their possible connection to the genesis of Kiruna-type and Nelsonite deposits was experimentally investigated by adding phosphoric acid (H3PO4), water, and sulfur, to andesite at 100–450 MPa, 500–900 °C, at the NiNiO and magnetite-hematite fO2 buffers using internally heated gas vessels. The addition of up to 8.02 wt% of H3PO4 to the andesite causes crystallization of apatite. At higher concentrations of H3PO4 whitlockite crystallizes, and at concentrations above ~ 11.4% H3PO4 (at 800 °C, 385 MPa) an immiscible P–Fe melt forms. Adding sulfur at low fO2 (NiNiO) causes an additional immiscible Fe–S melt to form. Increasing the fO2 to the hematite-magnetite buffer causes the sulfur-rich melt to shift in composition to a Ca–S–O melt, and the coexisting P-Fe melt to incorporate large amounts of SO4. Immiscible P-Fe melts can form at temperatures above 1100 °C down to 600 °C (at 400 MPa). Mass balance calculations show that some experimentally produced P-Fe rich immiscible liquids may result in mineral assemblages similar to those found at some Kiruna-type deposits, such as actinolite-rich dikes, and apatite-rich veins. Depending on the geological conditions and the composition the fractionation of a P-Fe melt may result in the formation of nelsonites at high pressures, high temperatures, and low fO2 or Kiruna-type deposits at lower temperatures and higher fO2.

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Acknowledgements

Thanks go to W. H. Blackburn for his help with the microprobe analysis, and to A. Philpotts, and J. R. Graney for their comments in 2005 on the Ph.D. thesis which served as the basis for this work. We want to thank the National Science Foundation grants: NSF EAR-9909452 and NSF EAR-0228975 for financial support. We also give thanks to Anne Westhues, John Hanchar, and two anonymous reviewers, whose suggestions greatly improved this manuscript.

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Authors and Affiliations

  1. Departamento de Obras Civiles y Geología, Universidad Católica de Temuco, 4781312, Temuco, Chile

    Haroldo L. Lledo

  2. Department of Geological Sciences and Environmental Studies, Binghamton University, Binghamton, NY, 13902-6000, USA

    H. Richard Naslund & David M. Jenkins

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  1. Haroldo L. Lledo
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  2. H. Richard Naslund
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Correspondence to Haroldo L. Lledo.

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Communicated by Timothy L. Grove.

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Lledo, H.L., Naslund, H.R. & Jenkins, D.M. Experiments on phosphate–silicate liquid immiscibility with potential links to iron oxide apatite and nelsonite deposits. Contrib Mineral Petrol 175, 111 (2020). https://doi.org/10.1007/s00410-020-01751-8

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