Karson, Jeffrey A; Rona, Peter A (1990): Observation of manganese deposits in the Kane Fractue Zone of the Mid-Atlantic Ridge [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.875536, Supplement to: Karson, JA; Rona, PA (1990): Block-tilting, transfer faults, and structural control of magmatic and hydrothermal processesin the TAG area, Mid-Atlantic Ridge 26°N. Bulletin of the Geological Society of America, 102(12), 1635-1645, https://doi.org/10.1130/0016-7606(1990)102%3C1635:BTTFAS%3E2.3.CO;2
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Abstract:
Seven Alvin dives (14 km total) and numerous deep-towed camera traverses using ANGUS and NOAA camera systems provide dense coverage of a 12-km2 portion of the eastern wall of the Mid-Atlantic Ridge in the TAG area (26°N lat.). These data, in conjunction with recent Soviet Mir submersible data, provide important constraints on the tectonic, magmatic, and hydrothermal history of this spreading center segment. Active hydrothermal venting occurs near the junction of the median valley floor and eastern median valley wall and appears to be tectonically controlled by the intersection of major fault zones. An east-west fault-line scarp interpreted as an accommodation zone intersects escarpments associated with 020°-trending (ridge-parallel) normal faults that bound the median valley floor. The accommodation zone permits differential extension and rotation between major crustal blocks to the north and south. On the basis of the distribution of tilted chalk beds and geochemical anomalies in sediments, this fault zone has been intermittently active for at least 5x104 yr. The accommodation zone has apparently provided a conduit of high permeability oriented at a high angle to the ridge axis. Observations and samples from areas surrounding active and inactive vent sites provide evidence for three distinct episodes for hydrothermal outflow driven by separate magmatic events. The geometry of this active system may have implications for the location of hydrothermal systems in active spreading regimes and for massive sulfide exploration in ophiolite terranes.
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:
Latitude: 26.133000 * Longitude: -44.783000
Date/Time Start: 1982-07-14T00:00:00 * Date/Time End: 1982-07-21T00:00:00
Minimum DEPTH, sediment/rock: 0 m * Maximum DEPTH, sediment/rock: 0 m
Event(s):
ALV-1240 (AL12400) * Latitude: 26.133000 * Longitude: -44.783000 * Date/Time: 1982-07-14T00:00:00 * Elevation: -3122.0 m * Location: Mid-Atlantic Ridge * Campaign: ALV1240 * Basis: Alvin * Method/Device: Grab (GRAB)
ALV-1240C (AL12400) * Latitude: 26.133000 * Longitude: -44.783000 * Date/Time: 1982-07-14T00:00:00 * Elevation: -3122.0 m * Location: Mid-Atlantic Ridge * Campaign: ALV1240 * Basis: Alvin * Method/Device: Photo/Video (PV)
ALV-1242 (AL12420) * Latitude: 26.133000 * Longitude: -44.783000 * Date/Time: 1982-07-15T00:00:00 * Elevation: -3216.0 m * Location: Mid-Atlantic Ridge * Campaign: ALV1242 * Basis: Alvin * Method/Device: Grab (GRAB)
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 | Substrate type | Substrate | ||||
| 8 | Sediment type | Sediment | ||||
| 9 | Comment | Comment | ||||
| 10 | Description | Description |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
112 data points
Data
| 1 Event | 2 ID | 3 Depth sed [m] | 4 Position | 5 Deposit type | 6 Quantity | 7 Substrate | 8 Sediment | 9 Comment | 10 Description |
|---|---|---|---|---|---|---|---|---|---|
| ALV-1240 | ALV-1240-1 | 0 | Surface | Mn coating | Several | Rock; basalt | Hard ground | Large fragments of basalt breccia | Heavily Mn-coated (0.1 cm). Alteration Mn cemented weathering |
| ALV-1240 | ALV-1240-2A | 0 | Surface | Mn coating | 1 | Consolidated sediment | Clay | Lithified brown colored sediment | Mn-coated (0.1 cm), lithfied, brown colored sediment |
| ALV-1240 | ALV-1240-3 | 0 | Surface | Mn coating | 1 | Rock; basalt | Hard ground | Basalt with plagioclase. Approx. 1.0 cm weathering rinds along cracks | Mn coating (0.1 cm) |
| ALV-1240C | ALV-1240C-1 | 0 | Surface | Mn crust | Several | Rock; chalk | Hard ground | Scarp broken slabs of chalk | Ferro-manganese crusts litter the 25-30¡ east-facing slope. |
| ALV-1242 | ALV-1242-1 | 0 | Surface | Mn coating | 1 | Cobble; basalt | Hard ground | Large basalt cobble with olivive and plagioclase. Coarse grained | Mn-coated (0.1 cm) |
| ALV-1242 | ALV-1242-3 | 0 | Surface | Mn crust | Several | Clay | Stained formaminifera rich sediment | Pieces of hydrothermal Mn crust. Up to 3.0 cm thick with platty appearance | |
| ALV-1242C | ALV-1242C-1 | 0 | Surface | Mn crust | Several | Rock; basalt | Ooze | Monotonous carbonate ooze interrupted only by small outcrops | Ferromanganese crusts, or basalts. |
| ALV-1243 | ALV-1243-1 | 0 | Surface | Mn crust | 1 | Thick, friable Mn crust. Peculiar reddish and green hues and textures. | |||
| ALV-1243 | ALV-1243-2 | 0 | Surface | Mn coating | Several | Rock; basalt | Hard ground | Angular basalt or pillow basalt fragments fragment | Mn-coated (0.1 cm) in weathered zones. |
| ALV-1243 | ALV-1243-3 | 0 | Surface | Mn crust | 1 | Consolidated sediment | Ooze | Carbonate ooze. Large piece of brownish, lithified sediment | Covered by 0.2 cm botryoidal Mn crust |
| ALV-1244 | ALV-1244-1 | 0 | Surface | Mn slab | Several | Layered thick Mn slabs with botryoidal surface. Inner surface very shiny and sometimes friable | |||
| ALV-1245 | ALV-1245-1 | 0 | Surface | Mn coating | Several | Boulder; basalt | Hard ground | Basalt boulder fragments and breccia, sometimes friable | Mn coating up to 0.5 cm layerd on surface |
| ALV-1246 | ALV-1246-1 | 0 | Surface | Mn crust | Several | Boulder; basalt | Ooze | Traces of foraminifera ooze with basalt boulder fragments and breccia | Mn crust, sometimes as thick as 1.0 cm. Outside surface with sponge fragments. |
| ALV-1246C | ALV-1246C-1 | 0 | Surface | Mn crust | Several | Fragment | Hard ground | Massive to crudely bedded breccias composed of variably weathered basaltic clasts (pebble to cobble size) in a matrix of well indurated carbonate mud | Minor ferromangenese clasts reaching sand size |
| ALV-1247 | ALV-1247-1 | 0 | In sediment | Mn rich layer | 1 | Hydrothermal | Ferromanganes rich deposit | Friable several cm thick friable pieces with shades of orange and black. Bulbous internal structure |