Bonatti, Enrico; Lawrence, James R; Hamlyn, P R; Breger, Dee (1980): (Table 2, page 1208) Average of 8 partial chemical analyses of opaque mineral grains bordering aragonite veins crossing serpentinized peridotite rocks from the Romanche Fracture Zone, Atlantic Ocean [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.873506, Supplement to: Bonatti, E et al. (1980): Aragonite from deep sea ultramafic rocks. Geochimica et Cosmochimica Acta, 44(8), 1207-1214, https://doi.org/10.1016/0016-7037(80)90074-5
Always quote citation above when using data! You can download the citation in several formats below.
Abstract:
Aragonite mineralization was observed in serpentinized peridotites from the Romanche and Vema Fracture Zones in the Atlantic and the Owen Fracture Zone in the Indian Ocean, either in veins or as radial aggregates in cavities within the serpentinites. Evidence of incipient dissolution of the aragonite crystals was observed in one case. The aragonites tend to have lower Mg content (< 0.03%) and higher Sr content (> 0.95%) relative to other marine aragonites. Their 18O16O, 13C12C and 87Sr86Sr isotopic ratios suggest the aragonite was deposited at ocean floor temperatures from solutions derived from sea water circulating in fissures and fractures within the ultramafic rocks. The 18O16O ratios of the serpentines indicate serpentinization occurred at higher temperatures, probably deeper in the crust. Low-T reactions between circulating seawater and Mg-silicates (primarily serpentine and pyroxenes) caused high pH and enrichment of Mg and Ca in the solution, conditions favoring carbonate precipitation. Aragonite was formed rather than calcite presumably because the high Mg2+ concentration in the solution inhibited calcite precipitation. The high Sr content of the aragonites is probably related, at least in part, to their low temperature of formation. Opaque mineral grains containing over 8% NiO and over 40% MnO were observed concentrated along the margins of some of the aragonite veins, suggesting that Ni is one of the elements mobilized during reactions between ultramafic rocks and circulating seawater.
Source:
Grant, John Bruce; Moore, Carla J; Alameddin, George; Chen, Kuiying; Barton, Mark (1992): The NOAA and MMS Marine Minerals Geochemical Database. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V52Z13FT
Further details:
Warnken, Robin R; Virden, William T; Moore, Carla J (1992): The NOAA and MMS Marine Minerals Bibliography. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V53X84KN
Project(s):
Coverage:
Latitude: -0.336667 * Longitude: -18.561667
Minimum DEPTH, sediment/rock: 0 m * Maximum DEPTH, sediment/rock: 0 m
Event(s):
G-7309-81 * Latitude: -0.336667 * Longitude: -18.561667 * Elevation: -4230.0 m * Location: Romanche Fracture Zone, Atlantic Ocean * Campaign: G-7309 * Basis: Gerda * Method/Device: Dredge (DRG)
Comment:
From 1983 until 1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions. At the time it was the most extended data compilation on ferromanganese deposits world wide. Initially published in a proprietary format incompatible with present day standards it was jointly decided by AWI and NOAA to transcribe this legacy data into PANGAEA. This transfer is augmented by a careful checking of the original sources when available and the encoding of ancillary information (sample description, method of analysis...) not present in the NOAA-MMS database.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Identification | ID | Bonatti, Enrico | |||
| 2 | Sample code/label | Sample label | Bonatti, Enrico | |||
| 3 | DEPTH, sediment/rock | Depth sed | m | Bonatti, Enrico | Geocode | |
| 4 | Silicon dioxide | SiO2 | % | Bonatti, Enrico | Electron microprobe (EMP) | |
| 5 | Aluminium oxide | Al2O3 | % | Bonatti, Enrico | Electron microprobe (EMP) | |
| 6 | Iron oxide, FeO | FeO | % | Bonatti, Enrico | Electron microprobe (EMP) | |
| 7 | Manganese oxide | MnO | % | Bonatti, Enrico | Electron microprobe (EMP) | |
| 8 | Nickel oxide | NiO | % | Bonatti, Enrico | Electron microprobe (EMP) | |
| 9 | Magnesium oxide | MgO | % | Bonatti, Enrico | Electron microprobe (EMP) | |
| 10 | Calcium oxide | CaO | % | Bonatti, Enrico | Electron microprobe (EMP) | |
| 11 | Sodium oxide | Na2O | % | Bonatti, Enrico | Electron microprobe (EMP) | |
| 12 | Potassium oxide | K2O | % | Bonatti, Enrico | Electron microprobe (EMP) | |
| 13 | Deposit type | Deposit type | Bonatti, Enrico | |||
| 14 | Substrate type | Substrate | Bonatti, Enrico | |||
| 15 | Description | Description | Bonatti, Enrico |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
14 data points