Citation:

PANGAEA.961653

Name: 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
Published: 2023-08-21
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Geochemistry; manganese micronodule; manganese nodule; ocean; sediment

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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: * 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: (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: (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):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event
2	Latitude of event	Latitude
3	Longitude of event	Longitude
4	Elevation of event	Elevation	m
5	Identification	ID		Hoffert, M
6	Deposit type	Deposit type		Hoffert, M
7	Silicon dioxide	SiO2	%	Hoffert, M	Arc spectrometry
8	Aluminium oxide	Al2O3	%	Hoffert, M	Arc spectrometry
9	Iron oxide, Fe2O3	Fe2O3	%	Hoffert, M	Arc spectrometry
10	Manganous manganic oxide	Mn3O4	%	Hoffert, M	Arc spectrometry
11	Magnesium oxide	MgO	%	Hoffert, M	Arc spectrometry
12	Calcium oxide	CaO	%	Hoffert, M	Arc spectrometry
13	Sodium oxide	Na2O	%	Hoffert, M	Emission spectrography
14	Potassium oxide	K2O	%	Hoffert, M	Emission spectrography
15	Titanium(II) oxide	TiO	%	Hoffert, M	Optical emission spectrography
16	Loss on ignition	LOI	%	Hoffert, M	Wet chemistry	at 1000°C
17	Strontium	Sr	mg/kg	Hoffert, M	Optical emission spectrography
18	Barium	Ba	mg/kg	Hoffert, M	Optical emission spectrography
19	Vanadium	V	mg/kg	Hoffert, M	Optical emission spectrography
20	Nickel	Ni	mg/kg	Hoffert, M	Optical emission spectrography
21	Cobalt	Co	mg/kg	Hoffert, M	Optical emission spectrography
22	Chromium	Cr	mg/kg	Hoffert, M	Optical emission spectrography
23	Boron	B	mg/kg	Hoffert, M	Optical emission spectrography
24	Zinc	Zn	mg/kg	Hoffert, M	Optical emission spectrography
25	Gallium	Ga	mg/kg	Hoffert, M	Optical emission spectrography
26	Copper	Cu	mg/kg	Hoffert, M	Optical emission spectrography