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  • Data  (9)
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  • 1
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    Component parts of the World Heat Flow Data Collection
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Area/locality; Conductivity, average; Depth, bottom/max; ELEVATION; Heat flow; LATITUDE; LONGITUDE; Method comment; Number; Sample, optional label/labor no; Temperature gradient
    Type: Dataset
    Format: text/tab-separated-values, 96 data points
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  • 2
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    Table 1. Composition of manganese crusts from the Atlantis Fracture Zone (1972)
    PANGAEA
    In:  Supplement to: Scott, Robert B; Rona, Peter A; Butler, Louis W; Nalwalk, Andrew J; Scott, Martha R (1972): Manganese Crusts of the Atlantis Fracture Zone. (see erratum for this paper: Nature Phys. Sci. 242, 95, 1973), Nature Physical Science, 239(92), 77-79, https://doi.org/10.1038/physci239077a0
    Details
    Publication Date: 2023-08-28
    Description: Summaries of the transition element chemistry of oceanic ferro-manganese deposits report compositional trends related to water depth and to geographic proximity to continental margins1-4. Explanations of compositional variations include continental source influence3, 5, 6, diagenetic environmental control of manganese mineralogy that regulates the trace metal composition1, 3, 7, ionic mobility in interstitial solutions during diagenesis3, 8-10, and volcanic or hydrothermal influence3, 11-14. Glasby15 rejects a significant pressure control on manganese oxide mineralogy on thermodynamic grounds.
    Keywords: Atlantic Ocean; Atomic absorption spectrometry (AAS); Chromium; Cobalt; Copper; Discoverer (1966); DISTANCE; Distance, maximum; Distance, minimum; Dredge; DRG; Event label; Iron; Manganese; Mercury; Nickel; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Sample ID; T3-71D 148-2B; T3-71D 160-10G; TAG1971; TAG1971-10G; TAG1971-2B; Trans-Atlantic Geotraverse 1971; Vanadium; Zinc
    Type: Dataset
    Format: text/tab-separated-values, 146 data points
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  • 3
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    Observation of manganese deposits in the Kane Fractue Zone of the Mid-Atlantic Ridge (1990)
    PANGAEA
    In:  Supplement to: Karson, Jeffrey A; Rona, Peter A (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
    Details
    Publication Date: 2023-08-28
    Description: 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.
    Keywords: AL12400; AL12420; AL12430; AL12440; AL12450; AL12460; AL12470; ALV1240; ALV-1240; ALV-1240C; ALV1242; ALV-1242; ALV-1242C; ALV1243; ALV-1243; ALV1244; ALV-1244; ALV1245; ALV-1245; ALV1246; ALV-1246; ALV-1246C; ALV1247; ALV-1247; Alvin; Comment; Deposit type; DEPTH, sediment/rock; Description; Event label; Grab; GRAB; Identification; Mid-Atlantic Ridge; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Photo/Video; Position; PV; Quantity of deposit; Sediment type; Substrate type; Visual description
    Type: Dataset
    Format: text/tab-separated-values, 112 data points
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  • 4
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    Composition and mineralogy of samples recovered from the TAG hydrothermal field (2022)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Description: Solid layered hydrothermal deposits have been retrieved using submersible ALVIN robotic arm over the Mid-Atlantic Ridge TAG field. These samples were analysed using Atomic absorption spectrometry (AAS) for their chemical composition and X-ray diffraction (XRD) to determine their mineralogy.
    Keywords: AL12430; AL12440; AL12470; Aluminium; ALV1243; ALV-1243; ALV1244; ALV-1244; ALV1247; ALV-1247; ALV-1247-2; Alvin; Atomic absorption spectrometry (AAS); Calcium; Cobalt; DEPTH, sediment/rock; Elevation of event; Event label; Geochemistry; Grab; GRAB; Identification; Iron; Latitude of event; Longitude of event; Loss of weight after drying at 110°C for 12h; Magnesium; Manganese; manganese micronodule; manganese nodule; Mid-Atlantic Ridge; Minerals; Nickel; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; ocean; Potassium; Sample type; sediment; Silicon; Titanium; Water in rock; X-ray diffraction (XRD)
    Type: Dataset
    Format: text/tab-separated-values, 56 data points
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  • 5
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    Geochemistry on manganese deposit from the Median Valley of the Mid-Atlantic Ridge (1974)
    PANGAEA
    In:  Supplement to: Scott, Martha R; Scott, Robert B; Rona, Peter A; Butler, Louis W; Nalwalk, Andrew J (1974): Rapidly accumulating manganese deposit from the Median Valley of the Mid-Atlantic Ridge. Geophysical Research Letters, 1(8), 355-358, https://doi.org/10.1029/GL001i008p00355
    Details
    Publication Date: 2023-08-28
    Description: A manganese oxide crust from an extensive deposit in the median valley of the Mid-Atlantic Ridge was found to be unusually high in manganese (up to 39.4% Mn), low in Fe (as low as 0.01% Fe), low in trace metals and deficient in Th230 and Pa231 with respect to the parent uranium isotopes in the sample. The accumulation rate is 100 mm to 200 mm/10 million year, or 2 orders of magnitude faster than the typical rate for deep-sea ferromanganese deposits. The rapid growth rate and unusual chemistry are consistent with a hydrothermal origin or with a diagenetic origin by manganese remobilized from reduced sediments. Because of the association with an active ridge, geophysical evidence indicative of hydrothermal activity, and a scarcity of sediment in the sampling area, we suggest that a submarine hot spring has created the deposit.
    Keywords: NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 6
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    (Table 1a, Page 356), Radiometric data for manganese crusts; typical crusts from the Atlantis Fracture Zone (1974)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Keywords: Atlantic Ocean; Discoverer (1966); DISTANCE; Distance, maximum; Distance, minimum; Dredge; DRG; Event label; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Sample ID; T3-71D 148-2B; T3-71D 160-10G; TAG1971; TAG1971-10G; TAG1971-2B; Thorium-230 excess; Thorium-230 excess, standard deviation; Thorium-232; Thorium-232, standard deviation; Trans-Atlantic Geotraverse 1971; Uranium; Uranium, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 66 data points
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  • 7
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    (Table 2, Annex), Manganese crusts and manganese coated rocks recovered from study area (lat 26°N) (1976)
    PANGAEA
    In:  Supplement to: Rona, Peter A; Harbison, Reginald N; Bassinger, Bobby G; Scott, Robert B; Nalwalk, Andrew J (1976): Tectonic fabric and hydrothermal activity of Mid-Atlantic Ridge crest (lat 26°N). Geological Society of America Bulletin, 87, 661-674, https://doi.org/10.1130/0016-7606(1976)87%3C661:TFAHAO%3E2.0.CO;2
    Details
    Publication Date: 2023-12-14
    Description: An asymmetric tectonic fabric was delineated by narrow-beam bathymetric profiles in a 180-km2 area of the Mid-Atlantic Ridge crest at lat 26°N. Features of the tectonic fabric are a continuous rift valley offset by small (〈10-km) transform faults and minor fracture zones expressed as valleys with intervening ridges that trend normal and oblique to the two sides of the rift valley. The discharge zone of a postulated sub-sea-floor hydrothermal convection system is focused by faults on the southeast wall of the rift valley and driven by intrusive heat sources beneath the rift valley. The rift valley has a double structure consisting of linear segments, bounded by ridges, and basins at the intersections of the minor fracture zones. The double structure of the rift valley acts like a template that programs the reproduction of the tectonic fabric. The minor fracture zones form an asymmetric V about the rift valley at variance with the symmetric small circles formed by major fracture zones. To reconcile the asymmetry of minor fracture zones with the symmetry of major fracture zones, it is proposed that the minor fracture zones have been preferentially reoriented by an external stress field attributed to interplate and intraplate motions. Major fracture zones remain symmetric under the same stress field owing to differential stability between minor and major structures of oceanic lithosphere.
    Keywords: Atlantic Ocean; Description; Discoverer (1966); Dredge, chain bag; Dredge, pipe; DRG_C; DRG_P; Event label; Mass; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; T3-72D 253-13; T3-72D 255-19; T4-73-2A3; TAG1972; TAG1972-13; TAG1972-19; TAG1972-20; TAG1972-22; TAG1972-23; TAG1973; TAG1973-2A; TAG1973-3A; TAG1975; TAG1975-1A; TO-75AK61-1A (AK #1671); Trans-Atlantic Geotraverse 1972; Trans-Atlantic Geotraverse 1973; Trans-Atlantic Geotraverse 1975
    Type: Dataset
    Format: text/tab-separated-values, 16 data points
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  • 8
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    (Table 1b, Page 356), Radiometric data from manganese crusts; sample 13-21 from the median valley of the Mid-Atlantic Ridge (1974)
    PANGAEA
    Details
    Publication Date: 2023-12-14
    Keywords: Age, 230Thorium; Age, 231Protactinium; Age, dated; Age, dated standard deviation; Atlantic Ocean; Discoverer (1966); DISTANCE; Distance, maximum; Distance, minimum; Dredge, chain bag; DRG_C; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Protactinium-231/Uranium-235 ratio; Protactinium-231/Uranium-235 ratio, standard deviation; Sample ID; T3-72D 253-13; TAG1972; TAG1972-13; Thorium-230/Uranium-234 ratio; Thorium-230/Uranium-234 ratio, standard deviation; Thorium-232; Thorium-232, standard deviation; Trans-Atlantic Geotraverse 1972; Uranium; Uranium, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 81 data points
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  • 9
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    (Table 2, Page 357), Compositions of layers within the largest fragment of the Site 13 manganese deposit and from sites 15 and 19 within 50 km of site 13 (1974)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Keywords: Atlantic Ocean; Atomic absorption spectrometry (AAS); Cobalt; Copper; Discoverer (1966); DISTANCE; Distance, maximum; Distance, minimum; Dredge; Dredge, chain bag; DRG; DRG_C; Event label; Iron; Manganese; Nickel; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Sample ID; T3-71D 254-15; T3-72D 253-13; T3-72D 255-19; TAG1971; TAG1971-15; TAG1972; TAG1972-13; TAG1972-19; Trans-Atlantic Geotraverse 1971; Trans-Atlantic Geotraverse 1972
    Type: Dataset
    Format: text/tab-separated-values, 68 data points
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