Citation:

dsdp.proc.54.104.1980

Name: Annotated record of the detailed examination of Mn deposits observed from bottom photography taken during the INDOMED-1 expedition
Published: 1980
License: https://creativecommons.org/licenses/by/3.0/

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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):

NOAA and MMS Marine Minerals Geochemical Database (NOAA-MMS)

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: * 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: * 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: * 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	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

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Event	2 ID	4 Position	5 Deposit type	6 Quantity	7 Size	8 Sediment	9 Description	10 File name	11 URL image
INMD-3-2C	INMD-3-2C-1	Surface	Mn nodule	Few	Small	Clay	Complete sediment burial, except for prominent bulbous pillowslavas. Scattered Mn nodules at the surface.	Fig_3-2_AB.jpg	Fig_3-2_AB.jpg
INMD-3-7C	INMD-3-7C-1	Surface	Mn nodule	Few	Small	Clay	Scattered Mn nodules at the foot of bulbous basalt blocks.	Fig_3-7_C.jpg	Fig_3-7_C.jpg
INMD-4-1C	INMD-4-1C-1	Surface	Mn nodule	Few		Clay	Scattered Mn nodules at the foot of basalt pillows.	Fig_4-1_F.jpg	Fig_4-1_F.jpg
INMD-4-3C	INMD-4-3C-1	Surface	Mn nodule	Few	Small	Clay	Scattered Mn nodules at the foot of basalt blocks.	Fig_4-3_D.jpg	Fig_4-3_D.jpg