Citation:

dsdp.proc.45.1979

Name: Annotated record of the detailed examination of Mn deposits from DSDP Leg 45 (Holes 395, 395A and 396)
Published: 1979
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Leg 45 of the Deep Sea Drilling Project was the inaugural cruise of the International Phase of Ocean Drilling. Its primary scientific objective was to develop an understanding of the composition, structure, and origin of oceanic crust by drilling as deeply into it as technology would permit. The feasibility of drilling deep into the oceanic crust was demonstrated during Leg 37 when one hole was drilled 586 meters into basaltic volcanic rocks near the crest of the Mid-Atlantic Ridge at about 37 °N. The areas of principal interest for Leg 45 were survey areas AT-5, situated near 23 °N, 46 °W and AT-6 near 23 °N, 43°W. The two survey areas are on opposite sides of the Mid-Atlantic Ridge, south of the Kane fracture zone. During Leg 45, Holes 395 and 395A were drilled in survey area AT-5 and Hole 396, was drilled in survey area AT-6.

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: 22.664300 * Median Longitude: -45.226400 * South-bound Latitude: 22.481300 * West-bound Longitude: -46.081700 * North-bound Latitude: 22.755800 * East-bound Longitude: -43.515800

Date/Time Start: 1975-12-06T00:00:00 * Date/Time End: 1976-01-11T00:00:00

Minimum DEPTH, sediment/rock: 21.66 m * Maximum DEPTH, sediment/rock: 514.50 m

Event(s):

45-395 * Latitude: 22.755800 * Longitude: -46.081700 * Date/Time: 1975-12-06T00:00:00 * Elevation: -4484.0 m * Penetration: 184.7 m * Recovery: 87.9 m * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 20 cores; 184.2 m cored; 0 m drilled; 47.7 % recovery

45-395A * Latitude: 22.755800 * Longitude: -46.081700 * Date/Time: 1975-12-09T00:00:00 * Elevation: -4484.0 m * Penetration: 664.1 m * Recovery: 112 m * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 68 cores; 624.1 m cored; 9.4 m drilled; 17.9 % recovery

45-396 * Latitude: 22.481300 * Longitude: -43.515800 * Date/Time: 1976-01-11T00:00:00 * Elevation: -4450.0 m * Penetration: 221.5 m * Recovery: 132.8 m * Location: North Atlantic/SEDIMENT POND * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 22 cores; 194 m cored; 27.8 m drilled; 68.5 % 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	Substrate type	Substrate
10	Sediment type	Sediment
11	Comment	Comment
12	Description	Description

License:

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

Size:

125 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 Substrate	10 Sediment	11 Comment	12 Description
45-395	45-395-9-4,110-150-1	45-395-9-4,110-150	79.99	In sediment	Mn micronodule	Several	0.1 cm		Clay	Intensely deformed dark yellowish brown and dark brown calcareous clays (Pliocene)	The smear slides typically show manganese oxide micronodules about 1mm diam (Site 395, Core 9, Cored Interval: 74.19-83.70 m, page 178)
45-395	45-395-13-CC,0-1	45-395-13-CC,0	109.00	Buried	Mn coating	1		Rock; basalt	Hard ground	Basalt - aphyric, moderately altered with tiny Plagioclase laths	Manganese oxide(?) dendrites occur on the flat lower end. (Visual descriptions of igneous rocks, page 184)
45-395A	45-395A-12-1,110-150-1	45-395A-12-1,110-150	164.90	Buried	Mn coating	1		Rock; basalt	Hard ground	Fine-grained, aphyric, moderately altered basalt	Mn-oxide specks visible on one surface. (Visual descriptions of igneous rocks, page 197)
45-395A	45-395A-18-1,143-1	45-395A-18-1,143	221.22	Buried	Mn coating	1		Rock; basalt	Hard ground	Phyric basalt	Piece 9 has a thin coat of palagonite and calcite with small dendritic Mn encrustations. (Visual descriptions of igneous rocks, page 203)
45-395A	45-395A-19-1,110-150-1	45-395A-19-1,110-150	230.50	Buried	Mn staining	Several		Rock; basalt	Hard ground	Phyric basalt, moderately altered	Weathered surfaces darkened with Mn-oxides (Visual descriptions of igneous rocks, page 204)
45-395A	45-395A-20-1,126-1	45-395A-20-1,126	233.16	Buried	Mn coating	Several		Rock; basalt	Hard ground	Phyric basalt, moderately to intensely altered	In some places, carbonate cover contains Mn spots (Visual descriptions of igneous rocks, page 204)
45-395A	45-395A-22-1,50-60-1	45-395A-22-1,50-60	254.45	Buried	Mn coating	Several		Rock; basalt	Hard ground	Phyric basalt	Along the crack between 4A and 4B are iron-hydroxides(?) with Mn-oxide spots (Visual descriptions of igneous rocks, page 20
45-395A	45-395A-24-1,144-1	45-395A-24-1,144	271.32	Buried	Mn coating	Several		Rock; basalt	Hard ground	Phyric basalt	Some pieces are broken along cracks with a brownish (Mn?) coating. (Visual descriptions of igneous rocks, page 207)
45-395A	45-395A-29-1,111-1	45-395A-29-1,111	318.45	Buried	Mn staining	1		Rock; basalt	Hard ground	Phyric basalt	Piece 3 has a weathered surface coated with tiny black dots (Mn oxides?). (Visual descriptions of igneous rocks, page 211)
45-395A	45-395A-36-1,83-1	45-395A-36-1,83	383.27	Buried	Mn coating	Several		Rock; basalt	Hard ground	Fine-grained aphyric basalt	Pieces 8, 9,11, 14, 15, and 18 have palagonite and zeolite)?) encrustations with black spots (Mn?). (Visual descriptions of igneous rocks, page 215)
45-395A	45-395A-40-1,144-1	45-395A-40-1,144	421.84	Buried	Mn staining	1		Rock; basalt	Hard ground	Fine-grained aphyric basalt	A weathered surface on the piece is coated by zeolite(?) with black spots (Mn?). (Visual descriptions of igneous rocks, page 217)
45-395A	45-395A-50-1,107-117-1	45-395A-50-1,107-117	514.50	Buried	Mn coating	Many		Rock; basalt	Hard ground	Fine-grained aphyric basalt	Many pieces have cracks less than 0.5 mm thick lined with carbonate or other whitish secondary minerals. Some fracture surfaces have an oxidized coating, possibly with Mn spots (Visual descriptions of igneous rocks, page 217)
45-396	45-396-14-31,100-1	45-396-14-31,100	21.66	In sediment	Mn micronodule	Few			Ooze	Brown marly nanno ooze (Middle Miocene)	Traces of manganese oxide micronodules are present. (Site 396, Core 14, Cored Interval: 117.20-126.74 m, page 280)
45-396	45-396-24-3,73-78-1	45-396-24-3,73-78	214.00	Buried	Mn coating	Several		Rock; basalt	Hard ground	Phyric basalt	Carbonate veinlets present in most pieces, sometimes associated with manganese spots, (especially visible on fracture surfaces coated with carbonate). (Visual descriptions of igneous rocks, page 293)