January 3, 2024 Dataset Open Access

Clarke, B. D.; Renno, Axel; Hamilton, David C.; Gilbricht, S.; Bachmann, Kai

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    "description": "<p>Data publication: The spatial association of accessory minerals with biotite in granitic rocks from the South Mountain Batholith, Nova Scotia, Canada</p>\n\n<p>D. Barrie Clarke; Axel D. Renno; David C. Hamilton; Sabine Gilbricht; Kai Bachmann</p>\n\n<p>Related to publication Geosphere (2022) 18 (1): 1&ndash;18; <a href=\"https://doi.org/10.1130/GES02339.1\">https://doi.org/10.1130/GES02339.1</a></p>\n\n\n\n\n\n<p>We use mineral liberation analysis (MLA) to quantify the spatial association of 15,118 grains of accessory apatite, monazite, xenotime, and zircon with essential biotite, and clustered with themselves, in a peraluminous biotite granodiorite from the South Mountain Batholith in Nova Scotia (Canada). A random distribution of accessory minerals demands that the proportion of accessory minerals in contact with biotite is identical to the proportion of biotite in the rock, and the binary touching factor (percentage of accessory mineral touching biotite divided by modal proportion of biotite) would be ~1.00. Instead, the mean binary touching factors for the four accessory minerals in relation to biotite are: apatite (5.06 for 11,168 grains), monazite (4.68 for 857 grains), xenotime (4.36 for 217 grains), and zircon (5.05 for 2876 grains). Shared perimeter factors give similar values. Accessory mineral grains that straddle biotite grain boundaries are larger than completely locked, or completely liberated, accessory grains. Only apatite-monazite clusters are significantly more abundant than expected for random distribution. The high, and statistically significant, binary touching factors and shared perimeter factors suggest a strong physical or chemical control on their spatial association. We evaluate random collisions in magma (synneusis), heterogeneous nucleation processes, induced nucleation in passively enriched boundary layers, and induced nucleation in actively enriched boundary layers to explain the significant touching factors. All processes operate during the crystallization history of the magma, but induced nucleation in passively and actively enriched boundary layers are most likely to explain the strong spatial association of phosphate accessories and zircon with biotite. In addition, at least some of the apatite and zircon may also enter the granitic magma as inclusions in grains of Ostwald-ripened xenocrystic biotite.</p>\n\n\n\n<p>This data repository contains the complete set of the respective MLA &ndash; measurements (Reference) including the raw data and the data analysis.</p>", 
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        "orcid": "0000-0002-4687-899X", 
        "affiliation": "Department of Earth and Environmental Sciences, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4R2", 
        "name": "Clarke, B. D."
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        "orcid": "0000-0002-8289-1059", 
        "affiliation": "Helmholtz Zentrum Dresden Rossendorf, Helmholtz Institute Freiberg for Resource Technology, Chemnitzer Stra\u00dfe 40, 09599 Freiberg, Germany", 
        "name": "Renno, Axel"
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      {
        "orcid": "0000-0002-7648-000X", 
        "affiliation": "Department of Mathematics and Statistics, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4R2", 
        "name": "Hamilton, David C."
      }, 
      {
        "orcid": "0000-0003-1113-2415", 
        "affiliation": "Institut f\u00fcr Mineralogie, TU Bergakademie Freiberg, Brennhausgasse 14, 09599 Freiberg, Germany", 
        "name": "Gilbricht, S."
      }, 
      {
        "orcid": "0000-0001-8904-6555", 
        "affiliation": "Helmholtz Zentrum Dresden Rossendorf, Helmholtz Institute Freiberg for Resource Technology, Chemnitzer Stra\u00dfe 40, 09599 Freiberg, Germany", 
        "name": "Bachmann, Kai"
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    "title": "Data publication: The spatial association of accessory minerals with biotite in granitic rocks from the South Mountain Batholith, Nova Scotia, Canada", 
    "access_right": "open", 
    "license": {
      "id": "CC-BY-4.0"
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    "publication_date": "2024-01-03", 
    "keywords": [
      "accessory minerals", 
      "biotite", 
      "spatial association", 
      "boundary layer", 
      "synneusis", 
      "heterogeneous nucleation", 
      "automated mineralogy", 
      "MLA"
    ], 
    "language": "eng", 
    "notes": "Explanation of the individual data files (in the zip directory).\nMain Directory:\n\u2022\tData_The spatial association of accessory minerals with biotite in granitic rocks\n\nSubdirectories:\n\u2022\tProcessed_Data\n\u2022\tRaw_Data\nProcessed_Data\n\u2022\texported diagrams\no\tapatite grain size distribution\no\tmonazite grain size distribution\no\txenotime grain size distribution\no\tzircon grain size distribution\n\u2022\texported excel tables\no\tAll_Samples\no\tgrain properties 2B3A\no\tgrain properties all geometric data\no\tgrain properties area px perimeter\no\tgrain properties length and breadth\no\tmineral association\nThe Raw Data File directory contains the MLA raw data in the default saved form."
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