Citation:

dsdp.proc.26.1974

Name: Annotated record of the detailed examination of Mn deposits from DSDP Leg 26 (Sites 250A, 252, 256, 257)
Published: 1974
License: https://creativecommons.org/licenses/by/3.0/

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Published: 1974 (exact date unknown) • DOI registered: 2017-01-06

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Abstract:

DSDP Leg 26, is the fifth cruise of D/V Glomar Challenger in the Indian Ocean, and the first cruise of Phase III of the Deep Sea Drilling Project. The Indian Ocean is the smallest of the three major ocean basins but appears to be geologically the most complex. The sites drilled on Leg 26 were selected to try to elucidate a number of specific problems of both local and broad regional significance, as well as to add to the general knowledge of the area. In particular: a) To locate the oldest sediment in the Indian Ocean and thus possibly the date of the initial breakup of Gondwanaland (Sites 250, 256, 257); b) To determine the effects of the initiation of the Circumpolar Current on southern Indian Ocean sedimentation (Sites 250, 252, 256, 257, 258); c) To determine the history of spreading of the Southwest Branch of the Indian Ocean Ridge and the history of the crust and oceanic sedimentation in that general region (Sites 250, 251, 252).

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: -31.236200 * Median Longitude: 76.933025 * South-bound Latitude: -37.040700 * West-bound Longitude: 39.369200 * North-bound Latitude: -23.455800 * East-bound Longitude: 108.349800

Date/Time Start: 1972-09-08T00:00:00 * Date/Time End: 1972-10-20T00:00:00

Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 695.39 m

Event(s):

26-250A * Latitude: -33.462300 * Longitude: 39.369200 * Date/Time: 1972-09-08T00:00:00 * Elevation: -5119.0 m * Penetration: 737.5 m * Recovery: 124.2 m * Location: Indian Ocean//BASIN * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 26 cores; 238.5 m cored; 0 m drilled; 52.1 % recovery

26-252 * Latitude: -37.040700 * Longitude: 59.238800 * Date/Time: 1972-09-23T00:00:00 * Elevation: -5032.0 m * Penetration: 247 m * Recovery: 40.8 m * Location: Indian Ocean//BASIN * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 6 cores; 57 m cored; 10 m drilled; 71.6 % recovery

26-256 * Latitude: -23.455800 * Longitude: 100.774300 * Date/Time: 1972-10-15T00:00:00 * Elevation: -5361.0 m * Penetration: 270 m * Recovery: 78.2 m * Location: Indian Ocean//BASIN * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 11 cores; 99 m cored; 0 m drilled; 78.9 % 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	Method/Device	Comment
1	Event label	Event
2	Identification	ID
3	Sample code/label	Sample label
4	DEPTH, sediment/rock	Depth sed	m		Geocode
5	Position	Position		Visual description
6	Deposit type	Deposit type
7	Quantity of deposit	Quantity
8	Size	Size
9	Sediment type	Sediment
10	Comment	Comment
11	Description	Description

License:

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

Size:

42 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
26-250A	26-250A-22-31,139-1	26-250A-22-31,139	695.39	Buried	Mn nodule	Several	1.5 cm	Clay	Moderate brown zeolite-bearing clay and nannofossil zeolite bearing clay (Coniacian)	Black nodules of opaque iron and/or manganese oxides up to 1.5 cm diameter are common throughout. ( Site 250A, Core 22, 691.0-700.5 m, page 49 )
26-250A	26-250A-22-31,139-1	26-250A-22-31,139	695.39	In sediment	Mn micronodule	Several		Clay	Moderate brown zeolite-bearing clay and nannofossil zeolite bearing clay (Coniacian)	Finely disseminated iron or manganese oxides also form striking dark bands or diffuse lighter colored patches in the brown clay. ( Site 250A, Core 22, 691.0-700.5 m, page 49 )
26-252	26-252-1-CC,0-1	26-252-1-CC,0	0.00	Surface	Mn nodule	Several	1.0x1.0x2.0 cm	Clay	Brown radiolarian clay with minor brown radiolarian silt-clay	About 10 small rounded manganese nodules (1.0x1.0x2.0 cm) found in the core catcher. ( Site 252, Core 1 Cored Interval: 0-0 m, page 142 )
26-256	26-256-4-11,110-1	26-256-4-11,110	87.10	In sediment	Mn micronodule	Many		Clay	Mostly dark yellowish brown and dark grayish brown detrital clay with a basal 30 cm interval of olive brown ferromanganese rich detrital clay	Dark grey patches, 1 cm in diameter, many with 1-5 mm micronodular centers. Smear slides of the micronodules assay 50% black opaque (ferromanganese) clay-sized grains.( Site 256, Core 4, Cored Interval:85.5-95.0 m, page 310 )
26-257	26-257-3-2,80-1	26-257-3-2,80	49.80	In sediment	Mn micronodule	Many		Clay	Dark orange detrital clay	Approx. 3% black 0.5-3 cm patches, many of which possess 1-2 mm black micronodular cores.( Site 257, Core 3, Cored Interval 47.5-57.0 m Hole Core, page 339 )