Mascle, Jean; Auroux, Christian (1989): Description of manganese deposits collected by R/V "Jean Charcot" during its EQUAMARGE II expedition in the Equatorial Atlantic [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.858531
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Abstract:
During the Equamarge II cruise (February 4 to March 21, 1988), on board the R. V. "Jean Charcot", 12.500 kms of continuous geophysical profiling have been recorded along three sectors of the Equatorial Atlantic. Two segments ofthe West African transform margin have been intensively surveyed off Guinea and off Ivory Coast and Ghana. The active Romanche fracture zone has been surveyed in details on a distance of about 100 kms. These data (multibeam bathymetry, continuous seismic profiling, magnetism and gravity) have been supplemented by 16 geological stations (dredging and coring). This report gives a synthetic review of the onboard analysis and allows to better understand the geological structures of the three surveyed areas.
Related to:
Mascle, Jean; Auroux, Christian (1989): Les marges continentales transformantes ouest - africaines : Guinée, Côte d'Ivoire, Ghana et la zone de la fracture de la Romanche. Campagne Equamarge II : rapport scientifique. Ifremer (pdf 40 MB), 139 pp, https://archimer.ifremer.fr/doc/00000/4461/
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):
Coverage:
Median Latitude: 5.709369 * Median Longitude: -15.259529 * South-bound Latitude: 0.050000 * West-bound Longitude: -17.666667 * North-bound Latitude: 9.350283 * East-bound Longitude: -2.666667
Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 6.10 m
Event(s):
EQUM-DR3 * Latitude: 8.658483 * Longitude: -16.907017 * Elevation: -2900.0 m * Location: Atlantic Ocean * Campaign: Equamarge_II * Basis: Jean Charcot * Method/Device: Dredge (DRG)
EQUM-DR4 * Latitude: 8.693367 * Longitude: -16.919433 * Elevation: -2120.0 m * Location: Atlantic Ocean * Campaign: Equamarge_II * Basis: Jean Charcot * Method/Device: Dredge (DRG)
EQUM-DR8 * Latitude: 3.500000 * Longitude: -2.666667 * Elevation: -2420.0 m * Location: Atlantic Ocean * Campaign: Equamarge_II * Basis: Jean Charcot * Method/Device: Dredge (DRG)
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 | Mascle, Jean | |||
| 2 | Latitude of event | Latitude | Mascle, Jean | |||
| 3 | Longitude of event | Longitude | Mascle, Jean | |||
| 4 | Elevation of event | Elevation | m | Mascle, Jean | ||
| 5 | Identification | ID | Mascle, Jean | |||
| 6 | DEPTH, sediment/rock | Depth sed | m | Mascle, Jean | Geocode | |
| 7 | Depth, top/min | Depth top | m | Mascle, Jean | ||
| 8 | Depth, bottom/max | Depth bot | m | Mascle, Jean | ||
| 9 | Position | Position | Mascle, Jean | Visual description | ||
| 10 | Deposit type | Deposit type | Mascle, Jean | |||
| 11 | Quantity of deposit | Quantity | Mascle, Jean | |||
| 12 | Size | Size | Mascle, Jean | |||
| 13 | Substrate type | Substrate | Mascle, Jean | |||
| 14 | Sediment type | Sediment | Mascle, Jean | |||
| 15 | Comment | Comment | Mascle, Jean | |||
| 16 | Description | Description | Mascle, Jean |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
84 data points
Data
| 1 Event | 2 Latitude | 3 Longitude | 4 Elevation [m] | 5 ID | 6 Depth sed [m] | 7 Depth top [m] | 8 Depth bot [m] | 9 Position | 10 Deposit type | 11 Quantity | 12 Size | 13 Substrate | 14 Sediment | 15 Comment | 16 Description |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| EQUM-DR3 | 8.6585 | -16.9070 | -2900 | EQUM-DR3-1 | 0.00 | 0.00 | 0.00 | Surface | Mn crust | 2 | Small | Rock; volcanic breccia | Dredging only recovered two small samples of volcanic breccia one of which being largely coated with a ferro-manganese crusts. The breccia cement is a yellow-brown, clay | ||
| EQUM-DR4 | 8.6934 | -16.9194 | -2120 | EQUM-DR4-1 | 0.00 | 0.00 | 0.00 | Surface | Mn crust | Many | Fragment | Abundant samples of basalt, volcanic breccia and ferro-manganese crusts | |||
| EQUM-E88-DR5 | 0.3634 | -17.5691 | -1750 | EQUM-E88-DR5-1 | 0.00 | 0.00 | 0.00 | Surface | Mn crust | Many | 01-10.0 cm thick | Rock; basalt | Sand | Globigerina sand | Most basaltic samples are partially covered with a manganese hydroxide crust which thickness ranges from a few millimeters to more than 10 cm. |
| EQUM-DR8 | 3.5000 | -2.6667 | -2420 | EQUM-DR8-1 | 0.00 | 0.00 | 0.00 | Surface | Mn crust | Many | Rock; sandstone | Large amount of polymetallic crusts, many rock fragments. Decimetric blocks of angular light colored sandstone encrusted with a black product (manganese). | |||
| EQUM-KS1 | 9.3503 | -17.5545 | -1820 | EQUM-KS1-1 | 0.10 | 0.00 | 0.20 | Buried | Mn crust | Several | Fragment | Clay | Yellow colored clay | Various gravel, including fragments of manganese crusts are also present. It is probably the top part of the unit 1. | |
| EQUM-KS2 | 9.3500 | -17.5333 | -1675 | EQUM-KS2-1 | 2.60 | 1.90 | 3.50 | In sediment | Mn micronodule | Several | 0.05-0.10 cm | Sand | Fine foraminifera sand | Mn micronodules Mn (5 to 10 mm) | |
| EQUM-KS2 | 9.3500 | -17.5333 | -1675 | EQUM-KS2-2 | 6.10 | 3.50 | 8.90 | In sediment | Mn micronodule | Several | 0.01 cm | Mud | Silty mud with foraminifera | Millimetric Mn micronodules | |
| EQUM-KS2 | 9.3500 | -17.5333 | -1675 | EQUM-KS2-3 | 3.80 | 3.80 | Buried | Mn nodule | 1 | 2.5 cm | Mud | Silty mud with foraminifera | One small Mn nodule, 2.5 cm diam. | ||
| EQUM-KS4 | 0.0500 | -17.6667 | -5880 | EQUM-KS4-1 | 0.10 | 0.00 | 0.20 | In sediment | Mn micronodule | Several | Mud | Lumpy argileous mud with radiolarians spicules | Mn micronodules and heavy minerals. |