Choi, Sarang; Park, Jung-Woo; Im, Sunghwan; Kim, Wonnyon; Choi, Sun Ki: Micro-analytical chemical composition and iron-magnesium ratios (XFeO) of primary and hydrothermal silicate minerals from the Onnuri Oceanic Core Complex [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.996100 (dataset in review), In: Choi, S et al.: Geochemical, Mineral Chemical, and Petrological Dataset of Serpentinites and Talc-Rich Metasomatites from the Onnuri Oceanic Core Complex, Central Indian Ridge [dataset bundled publication]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.996097 (dataset in review)
Abstract:
High-spatial-resolution major element chemical compositions (wt.%) and computed structural XFeO ratios [FeO/(FeO+MgO)] of coexisting silicate phases were measured on thin-section textural domains of samples recovered from the Onnuri Oceanic Core Complex detachment fault zone, Central Indian Ridge, during the 2019 and 2022 R/V ISABU dredge operations (RD1912, RD1913, RD2208). The aim was to track mineral-scale chemical evolution, local element partitioning, and micro-textural iron sequestration across the matrix and distinct hydrothermal vein networks (V1, V2, V3). In-situ chemical mapping and spot analyses were conducted using a JEOL JXA-8530F Field-Emission Electron Probe Micro-Analyzer (FE-EPMA) at Seoul National University. Operating conditions were set to an accelerating voltage of 15 kV and a beam current of 10 nA. A defocused beam (5 μm diameter) was strictly utilized to prevent beam-induced volatilization of structural hydroxyl groups in volatile-sensitive hydrous silicates (serpentine, talc, tremolite, chlorite, anthophyllite).
Keyword(s):
Coverage:
Median Latitude: -11.420718 * Median Longitude: 66.401321 * South-bound Latitude: -11.428260 * West-bound Longitude: 66.378405 * North-bound Latitude: -11.413095 * East-bound Longitude: 66.421243
Minimum Elevation: -3133.0 m * Maximum Elevation: -2045.0 m
Event(s):
RD1912_DREG * Latitude Start: -11.413095 * Longitude Start: 66.418228 * Latitude End: -11.414573 * Longitude End: 66.421243 * Elevation Start: -2162.0 m * Elevation End: -2045.0 m * Method/Device: Dredge (DRG) * Comment: Geomorphology: Detachment fault surface. Lithology: Diabase, Gabbro, Serpentinite
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Choi, Sarang | |||
| 2 | Lithology/composition/facies | Lithology | Choi, Sarang | |||
| 3 | Sample number | Sample no | Choi, Sarang | |||
| 4 | Point number | Point no | Choi, Sarang | |||
| 5 | Mineral phase | Mineral phase | Choi, Sarang | |||
| 6 | Texture | Texture | Choi, Sarang | Textural domain | ||
| 7 | Silicon dioxide | SiO2 | % | Choi, Sarang | Field-Emission Electron Probe Microanalyzer (FE-EPMA), JEOL, JXA-8530F | wt. % |
| 8 | Titanium dioxide | TiO2 | % | Choi, Sarang | Field-Emission Electron Probe Microanalyzer (FE-EPMA), JEOL, JXA-8530F | wt. % |
| 9 | Aluminium oxide | Al2O3 | % | Choi, Sarang | Field-Emission Electron Probe Microanalyzer (FE-EPMA), JEOL, JXA-8530F | wt. % |
| 10 | Chromium(III) oxide | Cr2O3 | % | Choi, Sarang | Field-Emission Electron Probe Microanalyzer (FE-EPMA), JEOL, JXA-8530F | wt. % |
| 11 | Iron oxide, FeO | FeO | % | Choi, Sarang | Field-Emission Electron Probe Microanalyzer (FE-EPMA), JEOL, JXA-8530F | wt. % |
| 12 | Manganese oxide | MnO | % | Choi, Sarang | Field-Emission Electron Probe Microanalyzer (FE-EPMA), JEOL, JXA-8530F | wt. % |
| 13 | Magnesium oxide | MgO | % | Choi, Sarang | Field-Emission Electron Probe Microanalyzer (FE-EPMA), JEOL, JXA-8530F | wt. % |
| 14 | Nickel oxide | NiO | % | Choi, Sarang | Field-Emission Electron Probe Microanalyzer (FE-EPMA), JEOL, JXA-8530F | wt. % |
| 15 | Calcium oxide | CaO | % | Choi, Sarang | Field-Emission Electron Probe Microanalyzer (FE-EPMA), JEOL, JXA-8530F | wt. % |
| 16 | Sodium oxide | Na2O | % | Choi, Sarang | Field-Emission Electron Probe Microanalyzer (FE-EPMA), JEOL, JXA-8530F | wt. % |
| 17 | Potassium oxide | K2O | % | Choi, Sarang | Field-Emission Electron Probe Microanalyzer (FE-EPMA), JEOL, JXA-8530F | wt. % |
| 18 | Total | Total | % | Choi, Sarang | wt. % | |
| 19 | Iron number | Fe/(Fe+Mg) | Choi, Sarang | XFeO=FeO/(FeO+MgO) |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
3264 data points
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