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Hoffert, Michel; Perseil, E A; Hekinian, Roger; Choukroune, P; Needham, H D; Francheteau, Jean; Le Pichon, Xavier (2023): Chemical analyses of Fe-Mn coatings separated from the margins of basaltic rocks from Transform Fault 'A' and from the the Rift Valley near 36°50'N in the Mid-Atlantic Ridge [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.961653

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Published: 2023-08-21 • DOI registered: 2023-09-26

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Abstract:
In order to evaluate the possible influence of hydrothermal activity on Fe-Mn coatings found on the surfaces of basaltic rocks in the median part of Transform Fault "A", a few samples collected in different structural settings less than 2 km away from the hydrothermal fields. They were analysed along with samples further West in the Transform Valley (sample ARP 74-13-23) and from the top of the deepestescarpment of the inner West wall of the Rift Valley near 36'50'N (sample cyp 74-31-40). Chemical analyses were done by arc spectrometry using an ARL quantometer were made at the University of Strasbourg. This method consists of melting the sample in a mixture of lithium tetraborate and then introducing the melt into in a glycolated solvent prior analysis. Trace elements were determined using graphite discs . Na and K were determined by emission spectrometry (precision of +- 2.0%).
Keyword(s):
Geochemistry; manganese micronodule; manganese nodule; ocean; sediment
Related to:
Choukroune, P; Francheteau, Jean; Le Pichon, Xavier (1978): In situ structural observations along Transform Fault A in the FAMOUS area, Mid-Atlantic Ridge. Geological Society of America Bulletin, 89(7), 1013, https://doi.org/10.1130/0016-7606(1978)89%3C1013:ISSOAT%3E2.0.CO;2
Hoffert, M; Perseil, E A; Hekinian, Roger; Choukroune, P; Needham, H D; Francheteau, Jean; Le Pichon, Xavier (1978): Hydrothermal deposits sampled by diving saucer in transform fault "A" near 37°N on the Mid-Atlantic Ridge, FAMOUS Area. Oceanologica Acta, 1(1), 699-712, publication-5216.pdf
Hoffert, Michel; Perseil, E A; Hekinian, Roger; Choukroune, P; Needham, H D; Francheteau, Jean; Le Pichon, Xavier (2023): Chemical analyses of hydrothermal deposits and associated material from Transform fault 'A' on the Mid-Atlantic Ridge, FAMOUS area [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.961652
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):
NOAA and MMS Marine Minerals Geochemical Database (NOAA-MMS)
Coverage:
Median Latitude: 36.928500 * Median Longitude: -33.116597 * South-bound Latitude: 36.833333 * West-bound Longitude: -33.283333 * North-bound Latitude: 36.964500 * East-bound Longitude: -33.055833
Date/Time Start: 1974-07-11T00:00:00 * Date/Time End: 1974-08-16T00:00:00
Minimum Elevation: -2923.0 m * Maximum Elevation: -2068.0 m
Event(s):
ARP-74-13-23  * Latitude: 36.929750 * Longitude: -33.160667 * Date/Time: 1974-08-10T00:00:00 * Elevation: -2923.0 m * Location: Mid-Atlantic Ridge * Campaign: FAMOUS 07-74 * Basis: Archimède (Submersible) * Method/Device: Grab (GRAB)
CY-74-19-7  * Latitude: 36.950417 * Longitude: -33.074167 * Date/Time: 1974-07-11T00:00:00 * Elevation: -2500.0 m * Location: Mid-Atlantic Ridge * Campaign: FAMOUS 06-74 (FAMOUS74) * Basis: Le Noroit * Method/Device: Grab, on Cyana [Submersible] (GRAB_subCyana)
CY-74-22-9  * Latitude: 36.946333 * Longitude: -33.055833 * Date/Time: 1974-07-20T00:00:00 * Elevation: -2720.0 m * Location: Mid-Atlantic Ridge * Campaign: FAMOUS 06-74 (FAMOUS74) * Basis: Le Noroit * Method/Device: Grab, on Cyana [Submersible] (GRAB_subCyana)
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.
This dataset represents the digitized Table 3, pp. 707 of the related publication.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Event labelEvent
2 Latitude of eventLatitude
3 Longitude of eventLongitude
4 Elevation of eventElevationm
5 IdentificationIDHoffert, M
6 Deposit typeDeposit typeHoffert, M
7 Silicon dioxideSiO2%Hoffert, MArc spectrometry
8 Aluminium oxideAl2O3%Hoffert, MArc spectrometry
9 Iron oxide, Fe2O3Fe2O3%Hoffert, MArc spectrometry
10 Manganous manganic oxideMn3O4%Hoffert, MArc spectrometry
11 Magnesium oxideMgO%Hoffert, MArc spectrometry
12 Calcium oxideCaO%Hoffert, MArc spectrometry
13 Sodium oxideNa2O%Hoffert, MEmission spectrography
14 Potassium oxideK2O%Hoffert, MEmission spectrography
15 Titanium(II) oxideTiO%Hoffert, MOptical emission spectrography
16 Loss on ignitionLOI%Hoffert, MWet chemistryat 1000°C
17 StrontiumSrmg/kgHoffert, MOptical emission spectrography
18 BariumBamg/kgHoffert, MOptical emission spectrography
19 VanadiumVmg/kgHoffert, MOptical emission spectrography
20 NickelNimg/kgHoffert, MOptical emission spectrography
21 CobaltComg/kgHoffert, MOptical emission spectrography
22 ChromiumCrmg/kgHoffert, MOptical emission spectrography
23 BoronBmg/kgHoffert, MOptical emission spectrography
24 ZincZnmg/kgHoffert, MOptical emission spectrography
25 GalliumGamg/kgHoffert, MOptical emission spectrography
26 CopperCumg/kgHoffert, MOptical emission spectrography
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
132 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
Event		2 
Latitude		3 
Longitude		4 
Elevation [m]		5 
ID		6 
Deposit type		7  
SiO2 [%]		8  
Al2O3 [%]		9  
Fe2O3 [%]		10  
Mn3O4 [%]		11  
MgO [%]		12  
CaO [%]		13  
Na2O [%]		14  
K2O [%]		15  
TiO [%]		16  
LOI [%]		17  
Sr [mg/kg]		18  
Ba [mg/kg]		19  
V [mg/kg]		20  
Ni [mg/kg]		21  
Co [mg/kg]		22  
Cr [mg/kg]		23  
B [mg/kg]		24  
Zn [mg/kg]		25  
Ga [mg/kg]		26  
Cu [mg/kg]
ARP-74-13-23 36.9297-33.1607-2923ARP-74-13-23-1HOF78Fe-Mn coating8.64.630.310.42.317.50.880.211.1031.642530752137065018007132831827410
CY-74-19-7 36.9504-33.0742-2500CY-74-19-7-1HOF78Fe-Mn coating7.94.634.514.12.9711.20.800.111.3421.5428269731570780250011039342427353
CY-74-22-9 36.9463-33.0558-2720CY-74-22-9-1HOF78Fe-Mn coating7.43.528.812.83.117.30.900.151.2733.612258744130065023008627627920300
CY-74-22-10 36.9645-33.0586-2068CY-74-22-10-1HOF78aFe-Mn coating7.44.536.717.23.667.31.280.201.7818.2131909161500110030007540038020393
CY-74-23-11 36.9467-33.0670-2700CY-74-23-11-1HOF78Fe-Mn coating8.85.238.113.42.998.31.340.221.4318.532535850150095023008240038016490
CY-74-31-40 36.8333-33.2833-2223CY-74-31-40-1HOF78Fe-Mn coating13.07.733.211.03.539.11.290.231.6416.86174566513007001900190345300<5500