Citation:

dsdp.proc.48.1979

Name: Annotated record of the detailed examination of Mn deposits from DSDP Leg 48 (Holes 400A, 401, 402)
Published: 1979
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Unlike many cruises of the Deep Sea Drilling Project, Leg 48 was scientifically planned to drill a number of sites to systematically address the problems of passive margin evolution. Site 400 was drilled at the foot of the Meriadzek Escarpment of North Biscay in 4399 meters depth. The site was located in a half-graben forming part of a succession of tilted and rotated fault blocks near the continent/ocean boundary. Site 401 was situated on the planated edge of a tilted fault-block underlying the southern edge of the Meriadzek Terrace on the north Biscay margin. Site 402 was located on the upper slope of the northern continental margin of the Bay of Biscay. The main objectives were to establish the presence or absence of shallow water Upper Cretaceous beds, and to penetrate pre-Aptian synrift sediments and the upslope equivalent of the deep water Albian-Aptian carbonaceous mudstones penetrated at Hole 400A.

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: 47.561300 * Median Longitude: -8.949767 * South-bound Latitude: 47.381700 * West-bound Longitude: -9.198300 * North-bound Latitude: 47.874700 * East-bound Longitude: -8.810300

Date/Time Start: 1976-05-25T00:00:00 * Date/Time End: 1976-06-11T00:00:00

Minimum DEPTH, sediment/rock: 42.76 m * Maximum DEPTH, sediment/rock: 520.20 m

Event(s):

48-400A * Latitude: 47.381700 * Longitude: -9.198300 * Date/Time: 1976-05-25T00:00:00 * Elevation: -4399.0 m * Penetration: 777.5 m * Recovery: 334 m * Location: North Atlantic/BASIN * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 73 cores; 692.5 m cored; 9.5 m drilled; 48.2 % recovery

48-401 * Latitude: 47.427500 * Longitude: -8.810300 * Date/Time: 1976-06-06T00:00:00 * Elevation: -2495.0 m * Penetration: 341 m * Recovery: 103.1 m * Location: North Atlantic/TERRACE * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 24 cores; 228 m cored; 38 m drilled; 45.2 % recovery

48-402 * Latitude: 47.874700 * Longitude: -8.840700 * Date/Time: 1976-06-11T00:00:00 * Elevation: -2339.0 m * Penetration: 137 m * Recovery: 12 m * Location: North Atlantic/SLOPE * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 5 cores; 42 m cored; 0 m drilled; 28.6 % 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	Substrate type	Substrate
9	Sediment type	Sediment
10	Comment	Comment
11	Description	Description

License:

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

Size:

67 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 Substrate	9 Sediment	10 Comment	11 Description
48-400A	48-400A-47-61,120-1	48-400A-47-61,120	520.20	Buried	Mn crust	Many	Consolidated sediment	Chalk	Spilicuferous nanno chalk (Middle Eocene)	Contains pyritized radiolarians and sponge spicules and clasts with manganese crusts (65%), but no foraminifers
48-401	48-401-5-1,113-171.5-1	48-401-5-1,113-171.5	114.42	Buried	Mn nodule	Several		Chalk	Nanno chalk (Middle Eocene)	Disseminated dark flecks, patches, streaks, and laminae of fine pyrite are common throughout. Some larger aggregates appear to be manganese nodules.
48-401	48-401-14-11,120-1	48-401-14-11,120	199.70	In sediment	Mn micronodule	Several		Chalk	Marly nanno chalk (Upper Paleocene)	Towards the top of the unit, disseminated manganese grains are present
48-401	48-401-19-1,20-1	48-401-19-1,20	246.20	Buried	Mn nodule	1		Chalk	Foram calcareous chalk (Cretaceous)	A manganese nodule occurs at 246.2 meters
48-401	48-401-19-1,118-120-1	48-401-19-1,118-120	247.19	In sediment	Mn micronodule	Several		Chalk	Laminated nannofossil and foraminiferal calcareous chalk (Cretaceous)	The coarse fraction (43%) comprises 5 per cent planktonic foraminifers and 2 per cent benthic foraminifers as well as manganese oxides, pyrite, limonite
48-401	48-401-19-1,118-120-2	48-401-19-1,118-120	247.19	Buried	Mn nodule	Several		Chalk	Laminated nannofossil and foraminiferal calcareous chalk (Cretaceous)	Manganese nodules in the form of manganiferous stromatolitic cauliform concretions generally associated with a hiatus or intense condensation
48-402	48-402-2-1,76-1	48-402-2-1,76	42.76	Buried	Mn coating	Several	Gravel	Mud	Homogeneous calcareous mud or marly ooze of grayish olive (10Y4/2) to light olive-gray (5Y5/2) (Pleistocene)	Manganese-coated ice-rafted gravels are present throughout.
48-402	48-402-3-11,110-1	48-402-3-11,110	81.10	Buried	Mn coating	Several	Gravel	Mud	Homogeneous calcareous mud or marly ooze of grayish olive (10Y4/2) to light olive-gray (5Y5/2) (Pleistocene)	Manganese-coated ice-rafted gravels are present throughout.