Melson, William G; Thompson, Geoffrey; van Andel, Tjeerd H (1968): Observation of manganese crusts recovered during the R/V Thomas Washington cruise 1965-1 in December 1965 in the Atlantic Ocean [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.859210, Supplement to: Melson, WG et al. (1968): Volcanism and metamorphism in the Mid-Atlantic Ridge, 22°N latitude. Journal of Geophysical Research, 73(18), 5925-5941, https://doi.org/10.1029/JB073i018p05925
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Abstract:
The petrology of the mid-Atlantic ridge between 22° and 23°N latitude may be typical of those portions of the ridge characterized by a linear topography parallel to the axis, a well-developed median valley, and an absence of volcanic cones. Submarine basalt lavas dredged at fifteen stations on the crest of the ridge are of three eruptive facies, all derived from essentially identical magmas; (1) pillow lavas, (2) sideromelane-rich tuffs, and (3) massive, mainly holocrystalline basalts. This association is well known from continental exposures of ancient submarine lavas. Chemically, the lavas are oceanic tholeiites and thus support the view that these low-potassium olivine basalts are by far the dominant eruptive on the deep-sea floor. In the 22° area, they are probably the product of voluminous fissure eruptions. The oceanic tholeiite is evidently the counterpart of the continental flood basalts, but it differs compositionally from these, especially in a lower potassium content. As a further characterization of the basalts, seven new analyses of major, minor, and trace elements are presented. Post-cooling hydrothermal metamorphism under some overburden has transformed some of these basalts into greenschists and lower-grade metamorphic rocks. New data indicate that faulting and shearing along the median valley combined with the introduction of hot, probably saline solutions were major agents in the metamorphism.
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: 22.574846 * Median Longitude: -45.163834 * South-bound Latitude: 22.240000 * West-bound Longitude: -45.420000 * North-bound Latitude: 22.817288 * East-bound Longitude: -45.002955
Minimum DEPTH, sediment/rock: 0 m * Maximum DEPTH, sediment/rock: 0 m
Event(s):
THV651-4D * Latitude: 22.522191 * Longitude: -45.002955 * Elevation: -2728.0 m * Location: Atlantic Ocean * Campaign: TW65-1 * Basis: Thomas Washington * Method/Device: Dredge (DRG)
THV651-8D * Latitude: 22.800000 * Longitude: -45.200000 * Elevation: -2600.0 m * Location: Atlantic Ocean * Campaign: TW65-1 * Basis: Thomas Washington * Method/Device: Dredge (DRG)
THV651-9D * Latitude: 22.240000 * Longitude: -45.020000 * Elevation: -3150.0 m * Location: Atlantic Ocean * Campaign: TW65-1 * Basis: Thomas Washington * 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 | Melson, William G | |||
| 2 | Identification | ID | Melson, William G | |||
| 3 | DEPTH, sediment/rock | Depth sed | m | Melson, William G | Geocode | |
| 4 | Position | Position | Melson, William G | Visual description | ||
| 5 | Deposit type | Deposit type | Melson, William G | |||
| 6 | Quantity of deposit | Quantity | Melson, William G | |||
| 7 | Size | Size | Melson, William G | |||
| 8 | Substrate type | Substrate | Melson, William G | |||
| 9 | Sediment type | Sediment | Melson, William G | |||
| 10 | Description | Description | Melson, William G |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
45 data points