Citation:

PANGAEA.961652

Name: Chemical analyses of hydrothermal deposits and associated material from Transform fault 'A' on the Mid-Atlantic Ridge, FAMOUS area
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:

Sampled hydrothermal deposits from Transform fault 'A' on the Mid-Atlantic Ridge have been classified into two main categories according to the relative proportion of the black Fe-Mn concretions with respect to the clay-rich fraction: clay-rich hydrothermal material and black Fe-Mn concretions (nodules). These materials have been analysed for their chemical composition 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 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

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: 36.942125 * Median Longitude: -33.063630 * South-bound Latitude: 36.940833 * West-bound Longitude: -33.067000 * North-bound Latitude: 36.945000 * East-bound Longitude: -33.061500

Date/Time Start: 1974-07-24T00:00:00 * Date/Time End: 1974-08-03T00:00:00

Minimum Elevation: -2695.0 m * Maximum Elevation: -2690.0 m

Event(s):

CY-74-23-12 * Latitude: 36.941000 * Longitude: -33.061500 * Date/Time: 1974-07-24T00:00:00 * Elevation: -2695.0 m * Location: Mid-Atlantic Ridge * Campaign: (FAMOUS74) * Basis: Le Noroit * Method/Device: Grab, on Cyana [Submersible] (GRAB_subCyana)

CY-74-26-14 * Latitude: 36.945000 * Longitude: -33.067000 * Date/Time: 1974-08-01T00:00:00 * Elevation: -2690.0 m * Location: Mid Atlantic Ridge * Campaign: (FAMOUS74) * Basis: Le Noroit * Method/Device: Grab, on Cyana [Submersible] (GRAB_subCyana)

CY-74-26-15 * Latitude: 36.941667 * Longitude: -33.062667 * Date/Time: 1974-08-03T00:00:00 * Elevation: -2690.0 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 2, pp. 706 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, Michel
6	Sample type	Samp type		Hoffert, Michel
7	Silicon dioxide	SiO2	%	Hoffert, Michel	Arc spectrometry
8	Aluminium oxide	Al2O3	%	Hoffert, Michel	Arc spectrometry
9	Iron oxide, Fe2O3	Fe2O3	%	Hoffert, Michel	Arc spectrometry
10	Manganous manganic oxide	Mn3O4	%	Hoffert, Michel	Arc spectrometry
11	Magnesium oxide	MgO	%	Hoffert, Michel	Arc spectrometry
12	Calcium oxide	CaO	%	Hoffert, Michel	Arc spectrometry
13	Sodium oxide	Na2O	%	Hoffert, Michel	Optical emission spectrography
14	Potassium oxide	K2O	%	Hoffert, Michel	Optical emission spectrography
15	Titanium(II) oxide	TiO	%	Hoffert, Michel	Optical emission spectrography
16	Loss on ignition	LOI	%	Hoffert, Michel	Wet chemistry	at 1000°C
17	Strontium	Sr	mg/kg	Hoffert, Michel	Optical emission spectrography
18	Barium	Ba	mg/kg	Hoffert, Michel	Optical emission spectrography
19	Vanadium	V	mg/kg	Hoffert, Michel	Optical emission spectrography
20	Nickel	Ni	mg/kg	Hoffert, Michel	Optical emission spectrography
21	Cobalt	Co	mg/kg	Hoffert, Michel	Optical emission spectrography
22	Chromium	Cr	mg/kg	Hoffert, Michel	Optical emission spectrography
23	Boron	B	mg/kg	Hoffert, Michel	Optical emission spectrography
24	Zinc	Zn	mg/kg	Hoffert, Michel	Optical emission spectrography
25	Gallium	Ga	mg/kg	Hoffert, Michel	Optical emission spectrography
26	Copper	Cu	mg/kg	Hoffert, Michel	Optical emission spectrography
27	Description	Description		Hoffert, Michel

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

270 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 Samp 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]	27 Description
CY-74-23-12	36.9410	-33.0615	-2695	CY-74-23-12-2HOF78	Mn nodule	16.6	1.7	16.3	37.20	3.70	2.3	2.47	0.97	0.08	15.93	353	589	321	570	91	13	204	126	5	275	Black Fe-mn rich concretion
CY-74-26-15	36.9417	-33.0627	-2690	CY-74-26-15-2HOF78	Mn nodule	8.7	0.7	13.7	40.30	2.68	7.3	1.47	0.28	0.04	20.11	615	703	108	172	73	9	170	40	9	137	Black Fe-mn rich concretion
CY-74-26-15	36.9417	-33.0627	-2690	CY-74-26-15-2HOF781a	Mn nodule	45.5	0.2	37.9	1.07	2.91	0.6	1.71	3.23	0.02	6.22	59	43	5	2	2	4	75	6	2	46	Dark green Fe-Mn rich concretion
CY-74-26-15	36.9417	-33.0627	-2690	CY-74-26-15-3HOF781b	Sediment	36.4	0.4	38.6	3.78	2.73	2.9	1.70	2.77	0.02	9.53	300	63	270	116	8	8	529	36	5	88	Dark green hydrothermal clay
CY-74-26-15	36.9417	-33.0627	-2690	CY-74-26-15-3HOF78A	Sediment	30.2	0.2	32.3	6.68	2.77	2.9	1.93	3.00	0.02	9.13	223	73	27	20	9	10	532	5	5	64	Yellowish green hydrothermal clay
CY-74-26-15	36.9417	-33.0627	-2690	CY-74-26-15-3HOF78B	Sediment	41.9	0.2	35.1	4.69	2.72	1.2	1.91	2.80	0.02	7.94	221	100	30	28	2	11	576	6	5	66	Yellowish green hydrothermal clay
CY-74-26-16	36.9408	-33.0634	-2690	CY-74-26-16-2HOF78	Sediment	44.4	0.2	35.6	3.88	2.84	0.8	1.84	3.35	0.02	6.95	149	56	48	33	2	9	592	9	5	49	Yellowish green hydrothermal clay
CY-74-26-15	36.9417	-33.0627	-2690	CY-74-26-15-3HOF78C	Sediment	41.0	3.2	29.9	4.69	4.39	4.4	2.13	2.28	0.20	8.14	257	101	101	66	10	62	461	24	5	73	Black hydrothermal clay
CY-74-26-15	36.9417	-33.0627	-2690	CY-74-26-15-3HOF78D	Sediment	39.0	5.9	20.8	4.01	5.24	9.5	1.83	1.55	0.38	9.94	217	72	117	71	27	84	293	79	13	60	White hydrothermal clay
CY-74-26-14	36.9450	-33.0670	-2690	CY-74-26-14-2HOF78A	Sediment	24.7	0.4	40.6	11.50	2.92	3.0	1.75	1.76	0.03	12.89	383	122	472	225	10	4	442	84	5	135	Brownish red hydrothermal clay
CY-74-26-14	36.9450	-33.0670	-2690	CY-74-26-14-sHOF78	Sediment	1.7	0.5	1.1	0.18	0.68	51.7	0.09	0.05	0.05	42.90	383	6	5	2	2	2	5	5	2	26	Sediment
CY-74-26-15	36.9417	-33.0627	-2690	CY-74-26-15-rHOF78	Basalt	49.6	15.7	8.8	0.18	8.42	10.8	2.05	0.59	0.85	0.94	102	313						8		100	Basalt