Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Fleischer, U; Meyer, O; Schaaf, H (1970): Magnetic and gravity measurements on North-South profiles across the Grosse Meteor Bank, North Atlantic [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.548400, Supplement to: Fleischer, U et al. (1970): Über den Aufbau der untermeerischen Tafelberge südlich der Azoren an Hand eines gravimetrisch-magnetischen Nord-Süd-Profils über die Große Meteor-Bank. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe C Geologie und Geophysik, Gebrüder Bornträger, Berlin, Stuttgart, C3, 37-47

Always quote citation above when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Abstract:
During the first section of the "Meteor" cruise No. 2 a profile was run from the Azores to the south across the flanks of the Mid-Atlantic Ridge with a chain of seamounts. The profile extended between the Cruiser (living) and the Hyeres seamounts, which, according to our soundings, form a connected massif, and across the centre of the Grosse Meteor Bank (30°N, 28.5 °W). These seamounts rise from a depth of more than 4000 m up till close to the surface of the sea forming there a large almost flat plateau. In the case of the Grosse Meteor Bank, this plateau has a N-S extension of approx. 30 nautical miles and an E-W extension of approx. 20 nautical miles and reaches a height of 275 m in water depth.
The gravity measurements yielded a density of the topographic masses of 2.6 g/cm**3 for the Grosse Meteor Bank. Magnitude and shape of the measured free-air anomaly are very well shown in a model computation with this density. The theoretical gravity effects of the seismically detected swell of cristalline rock and of the Moho depression (mountain root) are not indicated by the observational data. It can, therefore, be assumed that the latter two neutralize each other. It seems, accordingly, that there is no local isostatic compensation of the topographic masses. Hence, the density of 2.6 g/cm**3 obtained would be about the true density of rock. In connection with the mean velocity of P waves (Aric et al., 1968) obtained by seismic refraction methods it must be concluded that the material of the 1200-4000 m thick surface layer of the Grosse Meteor Bank consists of consolidated sediments.
This finding is supported by the total intensity of the Earth's magnetic field over the Grosse Meteor Bank. On the assumption of a homogeneous magnetization in the direction of the present Earth's field, the computed anomaly of the massif deviates considerably from the measured anomaly while the magnetic field of the seismically detected crystalline body is capable of interpreting the observed data.
Deviating from the prevailing interpretation of the seamounts' plateau as a volcanic cone with submarine abrasion, the Grosse Meteor Bank and the seamounts in the vicinity are assumed to be of continental origin. The questions whether these seamounts submerged later on or whether the sealevel has risen subsequently are, therefore, largely nonexistent.
Coverage:
Median Latitude: 31.723217 * Median Longitude: -28.373517 * South-bound Latitude: 25.556700 * West-bound Longitude: -29.200000 * North-bound Latitude: 35.250000 * East-bound Longitude: -28.093300
Date/Time Start: 1965-08-18T06:00:00 * Date/Time End: 1965-08-20T13:00:00
Event(s):
M2_20017 * Latitude Start: 35.250000 * Longitude Start: -28.093333 * Latitude End: 33.968333 * Longitude End: -28.163333 * Date/Time Start: 1965-08-18T06:00:00 * Date/Time End: 1965-08-18T13:00:00 * Elevation Start: -3550.0 m * Elevation End: -2590.0 m * Location: Atlantic * Campaign: M2 (IQSY - Jahre der ruhigen Sonne, Atlantische Expedition 1965) * Basis: Meteor (1964) * Method/Device: Magnetometer (MAG)
M2_20018 * Latitude Start: 33.963333 * Longitude Start: -28.191667 * Latitude End: 33.376667 * Longitude End: -28.218333 * Date/Time Start: 1965-08-18T14:00:00 * Date/Time End: 1965-08-18T17:00:00 * Elevation Start: -2535.0 m * Elevation End: -4140.0 m * Location: Atlantic * Campaign: M2 (IQSY - Jahre der ruhigen Sonne, Atlantische Expedition 1965) * Basis: Meteor (1964) * Method/Device: Magnetometer (MAG)
M2_20019 * Latitude Start: 33.403333 * Longitude Start: -28.208333 * Latitude End: 32.158333 * Longitude End: -28.321667 * Date/Time Start: 1965-08-18T18:00:00 * Date/Time End: 1965-08-19T01:00:00 * Elevation Start: -4145.0 m * Elevation End: -1275.0 m * Location: Atlantic * Campaign: M2 (IQSY - Jahre der ruhigen Sonne, Atlantische Expedition 1965) * Basis: Meteor (1964) * Method/Device: Magnetometer (MAG)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text — use the following character encoding:

Datasets listed in this publication series

  1. Fleischer, U; Meyer, O; Schaaf, H (1970): Individual magnetic and gravity measurement on North-South profile M2_20017 across the Grosse Meteor Bank (Table 1). https://doi.org/10.1594/PANGAEA.474690
  2. Fleischer, U; Meyer, O; Schaaf, H (1970): Individual magnetic and gravity measurement on North-South profile M2_20018 across the Grosse Meteor Bank (Table 1). https://doi.org/10.1594/PANGAEA.474774
  3. Fleischer, U; Meyer, O; Schaaf, H (1970): Individual magnetic and gravity measurement on North-South profile M2_20019 across the Grosse Meteor Bank (Table 1). https://doi.org/10.1594/PANGAEA.474783
  4. Fleischer, U; Meyer, O; Schaaf, H (1970): Individual magnetic and gravity measurement on North-South profile M2_20020 across the Grosse Meteor Bank (Table 1). https://doi.org/10.1594/PANGAEA.474791
  5. Fleischer, U; Meyer, O; Schaaf, H (1970): Individual magnetic and gravity measurement on North-South profile M2_20021 across the Grosse Meteor Bank (Table 1). https://doi.org/10.1594/PANGAEA.474800
  6. Fleischer, U; Meyer, O; Schaaf, H (1970): Individual magnetic and gravity measurement on North-South profile M2_20022 across the Grosse Meteor Bank (Table 1). https://doi.org/10.1594/PANGAEA.474806