Lonsdale, Peter; Spiess, Fred N (1980): Annotated record of the detailed examination of Mn deposits observed from bottom photography taken during the INDOMED-1 expedition [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.873176, Supplement to: Lonsdale, P; Spiess, FN (1980): Deep-Tow Observations at the East Pacific Rise, 8°45'N, and Some Interpretations. In: Rosendahl, B.R.; Hekinian, R.; et al., Initial Reports of the Deep Sea Drilling Project, U.S. Government Printing Office, LIV, 43-62, https://doi.org/10.2973/dsdp.proc.54.104.1980
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Abstract:
A near-bottom survey of a 24-km length of the East Pacific Rise (EPR) crest near the Leg 54 drill sites has established that the axial ridge is a 12- to 15-km-wide lava plateau, bounded by steep 300-meter-high slopes that in places are large outward-facing fault scarps. The plateau is bisected asymmetrically by a 1- to 2-km-wide crestal rift zone, with summit grabens, pillow walls, and axial peaks, which is the locus of dike injection and fissure eruption. About 900 sets of bottom photos of this rift zone and adjacent parts of the plateau show that the upper oceanic crust is composed of several different types of pillow and sheet lava. Sheet lava is more abundant at this rise crest than on slow-spreading ridges or on some other fastspreading rises. Beyond 2 km from the axis, most of the plateau has a patchy veneer of sediment, and its surface is increasingly broken by extensional faults and fissures. At the plateau's margins, secondary volcanism builds subcircular peaks and partly buries the fault scarps formed on the plateau and at its boundaries. Another deep-tow survey of a patch of young abyssal hills 20 to 30 km east of the spreading axis mapped a highly lineated terrain of inactive horsts and grabens. They were created by extension on inward- and outwardfacing normal faults, in a zone 12 to 20 km from the axis. Sediments sampled on the rise crest and flanks are mixtures of calcareous ooze and metalliferous precipitates, and they have been redistributed by southerly currents with average velocities of 9 cm/s.
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: 8.767815 * Median Longitude: -104.198630 * South-bound Latitude: 8.745318 * West-bound Longitude: -104.265845 * North-bound Latitude: 8.819114 * East-bound Longitude: -104.172656
Date/Time Start: 1977-10-01T00:00:00 * Date/Time End: 1977-10-01T00:00:00
Minimum DEPTH, sediment/rock: 0 m * Maximum DEPTH, sediment/rock: 0 m
Event(s):
INMD-3-2C * Latitude: 8.745507 * Longitude: -104.177807 * Date/Time: 1977-10-01T00:00:00 * Elevation: -2628.0 m * Location: East Pacific Ocean * Campaign: Indomed_leg_1 * Basis: Melville * Method/Device: Photo/Video (PV)
INMD-3-7C * Latitude: 8.745318 * Longitude: -104.265845 * Date/Time: 1977-10-01T00:00:00 * Elevation: -2734.0 m * Location: East Pacific Ocean * Campaign: Indomed_leg_1 * Basis: Melville * Method/Device: Photo/Video (PV)
INMD-4-1C * Latitude: 8.819114 * Longitude: -104.172656 * Date/Time: 1977-10-01T00:00:00 * Elevation: -2613.0 m * Location: East Pacific Ocean * Campaign: Indomed_leg_1 * Basis: Melville * Method/Device: Photo/Video (PV)
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 | ||||
| 2 | Identification | ID | ||||
| 3 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 4 | Position | Position | Visual description | |||
| 5 | Deposit type | Deposit type | ||||
| 6 | Quantity of deposit | Quantity | ||||
| 7 | Size | Size | ||||
| 8 | Sediment type | Sediment | ||||
| 9 | Description | Description | ||||
| 10 | File name | File name | ||||
| 11 | Uniform resource locator/link to image | URL image |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
35 data points