Citation:

dsdp.proc.25.120.1974

Name: Annotated record of the detailed examination of Mn deposits from DSDP Leg 25 (Sites 239, 242, 245, 245A, 248)
Creator: Lucien Leclaire
Published: 1974
License: https://creativecommons.org/licenses/by/3.0/

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Published: 1974 (exact date unknown) • DOI registered: 2017-01-04

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Abstract:

Pelagic deposits are the dominant contributors to the sediment layers that blanket ridges and basaltic sea floor in deep basins. Among pelagic constituents, nannofossils undoubtedly are the predominant contributor, especially to Cenozoic chalk and ooze. Among Leg 25 sites, the most typical pelagic deposits are found in the Madagascar Basin (Site 245) including a clayey nanno chalk, bearing Fe-Mn oxides, resting directly on the basalt and overlain successively by a nanno chalk which is interlayered with chert and devitrified volcanic ash and a nearly pure nanno ooze. The lithologic sequence is capped by brown clay. Upper Cenozoic foram sand and foram nanno ooze were found on the Mozambique Ridge (Site 249) and particularly on the Madagascar Ridge (Site 246). Biogenic silica-rich facies are rare and mainly located near the top of the lowest latitude sites.

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):

Deep Sea Drilling Project (DSDP)

NOAA and MMS Marine Minerals Geochemical Database (NOAA-MMS)

Coverage:

Median Latitude: -25.947160 * Median Longitude: 47.115520 * South-bound Latitude: -31.533700 * West-bound Longitude: 37.474700 * North-bound Latitude: -15.844200 * East-bound Longitude: 52.301800

Date/Time Start: 1972-07-01T00:00:00 * Date/Time End: 1972-08-14T00:00:00

Minimum DEPTH, sediment/rock: 9.29 m * Maximum DEPTH, sediment/rock: 632.39 m

Event(s):

25-239 * Latitude: -21.294500 * Longitude: 51.678800 * Date/Time: 1972-07-01T00:00:00 * Elevation: -4971.0 m * Penetration: 326 m * Recovery: 106.1 m * Location: Indian Ocean//BASIN * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 19 cores; 157 m cored; 18 m drilled; 67.6 % recovery

25-242 * Latitude: -15.844200 * Longitude: 41.820500 * Date/Time: 1972-07-23T00:00:00 * Elevation: -2275.0 m * Penetration: 676 m * Recovery: 102.9 m * Location: Indian Ocean//CHANNEL * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 18 cores; 125 m cored; 9 m drilled; 82.3 % recovery

25-245 * Latitude: -31.533700 * Longitude: 52.301800 * Date/Time: 1972-08-03T00:00:00 * Elevation: -4857.0 m * Penetration: 396.5 m * Recovery: 82 m * Location: Indian Ocean//BASIN * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 17 cores; 144.5 m cored; 6 m drilled; 56.7 % recovery

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	Event label	Event		Leclaire, Lucien
2	Identification	ID		Leclaire, Lucien
3	Sample code/label	Sample label		Leclaire, Lucien
4	DEPTH, sediment/rock	Depth sed	m	Leclaire, Lucien		Geocode
5	Position	Position		Leclaire, Lucien	Visual description
6	Deposit type	Deposit type		Leclaire, Lucien
7	Quantity of deposit	Quantity		Leclaire, Lucien
8	Size	Size		Leclaire, Lucien
9	Sediment type	Sediment		Leclaire, Lucien
10	Comment	Comment		Leclaire, Lucien
11	Description	Description		Leclaire, Lucien

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

77 data points

Data

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

1 Event	2 ID	3 Sample label	4 Depth sed [m]	5 Position	6 Deposit type	7 Quantity	8 Size	9 Sediment	10 Comment	11 Description
25-239	25-239-15-2,20-1	25-239-15-2,20	273.50	Buried	Mn nodule	1	0.5-1.0 cm	Clay	Brown clay, silt bearing (Upper Paleocene)	One manganese nodule, 0.5-1 cm in diameter. ( Site 239, Core 15, Cored interval: 272-281 m, page 48 )
25-239	25-239-15-3,120-1	25-239-15-3,120	276.20	Buried	Mn nodule	2	0.5-1.0 cm	Clay	Clay rich nanno ooze (Upper Paleocene)	Two manganese nodules, 0.5-1 cm in diameter. ( Site 239, Core 15, Cored interval: 272-281 m, page 48 )
25-242	25-242-8-5,34-1	25-242-8-5,34	485.84	Buried	Mn coating	Several		Chalk, Fragment; limestone	Manganese clayey carbonate chalk (Lower Miocene)	Conspicuous bedding plane with black MnO2 coating on carbonate fragments. ( Site 242, Core 8, Cored interval: 479-488 m, page 159 )
25-242	25-242-13-1,89-1	25-242-13-1,89	632.39	In sediment	Mn rich layer	1		Ooze	Manganese nanno ooze (Lower oligocene)	50% manganese. ( Site 242, Core 13, Cored interval: 631-640 m, page 160 )
25-245	25-245-1-2,79-1	25-245-1-2,79	9.29	In sediment	Mn micronodule	Several		Clay	Brown clay, silt rich (Middle Miocene)	Opaques presumably are Fe and Mn oxides. Micronodules of MnO2 remain on coarser sieves with fish teeth and bones. ( Site 245, Core 1, Cored interval: 7-16 m, page 209 )
25-245	25-245-3-5,80-1	25-245-3-5,80	127.80	In sediment	Mn micronodule	Several		Ooze	Pale orange clay-bearing to clay-rich nanno ooze containing foraminifera and iron oxides (Middle Eocene)	Some manganese micronodules form specks in the sediment. ( Site 245, Core 3, Cored interval : 121-130 m, page 210 )
25-245A	25-245A-2-2,24-1	25-245A-2-2,24	55.74	Buried	Mn nodule	1	1.0 cm	Clay	Silty clay (Upper Eocene)	Mn nodule, 1 cm diameter. ( Site 245A, Core 2, Cored Interval: 54-63 m, page 217 )
25-245A	25-245A-2-41,140-1	25-245A-2-41,140	59.95	Buried	Mn nodule	1	1.0 cm	Ooze	Clayey nanno ooze (Upper Eocene)	Mn nodule, 1 cm diameter. ( Site 245A, Core 2, Cored Interval: 54-63 m, page 217 )
25-248	25-248-10-2,95-1	25-248-10-2,95	314.45	Buried	Mn nodule	1	1.0 cm	Clay	Volcanic manganese rich silty clay (Lower Miocene)	Small (1 cm) Mn nodule at 95 cm. ( Site 248, Core 10, Cored Interval: 312-321 m, page 276 )