Choi, Sarang; Park, Jung-Woo; Im, Sunghwan; Kim, Wonnyon; Choi, Sun Ki: Quantitative mass-balance and chemical flux inversion dataset of the silica metasomatic front at the Onnuri Oceanic Core Complex [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.996127 (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:
Quantitative chemical mass transfer fractions and element enrichment factors (EF) computed relative to a conservative reference baseline were modeled for the mafic–ultramafic alteration interface at the Onnuri Oceanic Core Complex, Central Indian Ridge. The aim was to determine absolute elemental fluxes (enrichment vs. depletion) and validate the conservative behavior of rock components during extreme fluid-mediated metasomatic transformation. Mass-balance calculations were performed using Grant's (1986) Isocon optimization equations, comparing the group-averaged composition of unaltered precursor serpentinites (C₀) against fully metasomatized talc-rich rocks (Cₐ). The reference isocon framework was established using a MgO-conservative model, which uniquely reconciled chemical mass-balance trends with independent physical volume dilation constraints (~30% expansion).
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 | Parameter | Parameter | Choi, Sarang | |||
| 2 | Parameter | Parameter | arbitrary units | Choi, Sarang | FeO | |
| 3 | Parameter | Parameter | arbitrary units | Choi, Sarang | Fe2O3 | |
| 4 | Parameter | Parameter | arbitrary units | Choi, Sarang | Fe2O3(T) | |
| 5 | Parameter | Parameter | arbitrary units | Choi, Sarang | SiO2 | |
| 6 | Parameter | Parameter | arbitrary units | Choi, Sarang | Al2O3 | |
| 7 | Parameter | Parameter | arbitrary units | Choi, Sarang | MgO | |
| 8 | Parameter | Parameter | arbitrary units | Choi, Sarang | CaO | |
| 9 | Parameter | Parameter | arbitrary units | Choi, Sarang | Na2O | |
| 10 | Parameter | Parameter | arbitrary units | Choi, Sarang | LOI | |
| 11 | Parameter | Parameter | arbitrary units | Choi, Sarang | Magnetite | |
| 12 | Parameter | Parameter | arbitrary units | Choi, Sarang | Total |
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:
60 data points
Data
| 1 Parameter | 2 Parameter [arbitrary units] (FeO) | 3 Parameter [arbitrary units] (Fe2O3) | 4 Parameter [arbitrary units] (Fe2O3(T)) | 5 Parameter [arbitrary units] (SiO2) | 6 Parameter [arbitrary units] (Al2O3) | 7 Parameter [arbitrary units] (MgO) | 8 Parameter [arbitrary units] (CaO) | 9 Parameter [arbitrary units] (Na2O) | 10 Parameter [arbitrary units] (LOI) | 11 Parameter [arbitrary units] (Magnetite) | 12 Parameter [arbitrary units] (Total) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Serpentinite average (wt.%) | 2.64 | 4.73 | 7.66 | 39.62 | 1.21 | 37.96 | 0.45 | 0.11 | 12.67 | 3.43 | 99.82 |
| Talc-rich metasomatite average (wt.%) | 4.62 | 1.48 | 6.62 | 56.73 | 1.71 | 27.35 | 1.31 | 0.22 | 5.69 | 0.18 | 99.76 |
| Enrichment factor (EF) | 1.75 | 0.31 | 0.86 | 1.43 | 1.41 | 0.72 | 2.95 | 1.99 | 0.45 | 0.05 | 1.00 |
| Mass change (g/100 g) | 3.77 | -2.67 | 1.52 | 39.12 | 1.16 | 0.00 | 1.38 | 0.20 | -4.77 | -3.18 | 38.65 |
| % gain or loss | 143.29 | -56.48 | 19.90 | 98.89 | 96.46 | 0.07 | 309.49 | 176.54 | -37.61 | -92.75 | 38.81 |