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  • Data  (7)
  • NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS  (5)
  • In Situ/Laboratory Instruments 〉 Magnetic/Motion Sensors 〉 Seismometers  (2)
  • 1980-1984  (7)
  • 1983  (1)
  • 1980  (6)
Collection
  • Data  (7)
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Keywords
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  • 1980-1984  (7)
Year
  • 1
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    Unknown
    Observations and rare earth element composition of manganese nodules during Atlantis cruise AT266, Blake Plateau (1980)
    PANGAEA
    In:  Supplement to: Manheim, Frank T; Pratt, Richard M; McFarlin, P F (1980): Composition and origin of phosphorite deposits of the Blake Plateau. In: Bentor, Y.K. (Ed.), Marine Phosphorites - Geochemistry, Occurrence, Genesis, Society of Economic Paleontologists and Mineralogists, Special Publication, 29, 117-137, https://download.pangaea.de/reference/80812/attachments/Manheim-etal_1980.pdf
    Details
    Publication Date: 2023-08-28
    Description: An area of about 22,000 km² on the northern Blake Plateau, off the coast of South Carolina, contains an estimated 2 billion metric tons of phosphorite concretions, and about 1.2 billion metric tons of mixed ferromanganese-phosphorite pavement. Other offshore phosphorites occur between the Blake Plateau and known continental deposits, buried under variable thicknesses of sediments. The phosphorite resembles other marine phosphorites in composition, consisting primarily of carbonate-fluorapatite, some calcite, minor quartz and other minerals. The apatite is optically pseudo-isotropic and contains about 6% [CO3]**2- replacing [PO4]**3- in its structure. JOIDES drillings and other evidence show that the phosphorite is a lag deposit derived from Miocene strata correlatable with phosphatic Middle Tertiary sediments on the continent. It has undergone variable cycles of erosion, reworking, partial dissolution and reprecipitation. Its present form varies from phosphatized carbonate debris, loose pellets, and pebbles, to continuous pavements, plates, and conglomeratic boulders weighing hundreds of kilograms. No primary phosphatization is currently taking place on the Blake Plateau. The primary phosphate-depositing environment involved reducing conditions and required at least temporary absence of the powerful Gulf Stream current that now sweeps the bottom of the Blake Plateau and has eroded away the bulk of the Hawthorne-equivalent sediments with which the phosphorites were once associated.
    Keywords: NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
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    Unknown
    Description, Beryllium characteristics and chemical composition of manganese nodules from the Pacific Ocean (1983)
    PANGAEA
    In:  Supplement to: Inoue, Teruo; Huang, Zui-Yao; Imamura, Mineo; Tanaka, Shigeo; Usui, Akira (1983): 10Be and 10Be/9Be in manganese nodules. Geochemical Journal, 17(6), 307-312, https://www.jstage.jst.go.jp/article/geochemj1966/17/6/17_6_307/_pdf
    Details
    Publication Date: 2023-08-28
    Description: Depth profiles of 10Be and 9Be concentrations have been measured in five manganese nodules from widely varying locations of the Pacific Ocean. Mean accumulation rate of these manganese nodules ranges from 2.7 to 8.0 mm/m.y.. The variation of 10Be and 10Be/9Be with depth or time is found to be less than ±30% for periods from 0.4-1.0 m.y. back to 6 m.y. B.P. Surface 10Be/9Be atomic ratio is found to be (9-13) x 10**-8, that shows authigenic nature of manganese nodule acuumulation by comparison with (12-31) x 10-8 for deep-sea water, (2-7) x 10**-8 for clay sediments and (7-9) x 10**-8 for fossil-rich sediments.
    Keywords: NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 3
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    Unknown
    Floor density and geochemistry of manganese nodules recovered for the DOMES Sites A, B and C, Pacific Ocean (1980)
    PANGAEA
    In:  Supplement to: Fewkes, Ronald H; McFarland, William Douglas; Reinhart, W R (1980): Evaluation of metal resources at and near proposed deep sea mine sites. United States Bureau of Mines, Open File Report, 108-80, 242 pp
    Details
    Publication Date: 2023-08-28
    Description: Methods of estimating manganese nodule grade and concentration were investigated using data from a well-explored east-central Pacific manganese nodule deposit. Bulk chemical analyses of 159 nodules recovered from 21 box cores show that the range in metal values between nodules from a single box core is commonly small but may be greater than the range in mean metal content of nodules from widely separated box cores. The metal exhibiting the greatest variability in the 21 box cores is Zn, followed in decreasing order by Cu, Mn, Co, Ni, and Fe. Approximately half of the box cores required analysis of 11 nodules or more to predict metal content within plus or minus 10 percent of the mean value.
    Keywords: NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 4
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    Annotated record and Pb, Th, U and Ra isotope concentrations for two cores of the Atlantic and Pacific Ocean (1980)
    PANGAEA
    In:  Supplement to: Kadko, David (1980): 230Th, 226Ra and 222Rn in abyssal sediments. Earth and Planetary Science Letters, 49(2), 360-380, https://doi.org/10.1016/0012-821X(80)90079-5
    Details
    Publication Date: 2023-08-28
    Description: A model that predicts the flux of 222Rn out of deep-sea sediment is presented. The radon is ultimately generated by 230Th which is stripped from the overlying water into the sediment. It is shown that the continental contribution of ionium is not significant, and that at low sedimentation rates, biological mixing and erosional processes strongly affect the surface concentration of the ionium. Two cores from areas of slow sediment accumulation, one from a manganese nodule region of the central Pacific and one from the Rio Grande Rise in the Atlantic were analyzed at closely spaced intervals for 230Th, 226Ra, and 210Pb. The Pacific core displayed evidence of biological mixing down to 12 cm and had a sedimentation rate of only 0.04 cm/kyr. The Atlantic core seemed to be mixed to 8 cm and had a sedimentation rate of 0.07 cm/kyr. Both cores had less total excess 230Th than predicted. Radium sediment profiles are generated from the 230Th model. Adsorbed, dissolved, and solid-phase radium is considered. According to the model, diffusional losses of radium are especially important at low sedimentation rates. Any particulate, or excess radium input is ignored in this model. The model fits the two analyzed cores if the fraction of total radium available for adsorption-desorption is about 0.5-0.7, and if K, the distribution coefficient, is about 1000. The flux of radon out of the sediments is derived from the model-generated radium profiles. It is shown that the resulting standing crop of SUP-222 Rn in the overlying water may be considered as an added constraint in budgeting 230Th and 226Ra in deep-sea sediments.
    Keywords: NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 5
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    Analysis of Mn-depositis from the Briançon area, France (1980)
    PANGAEA
    In:  Supplement to: Bourbon, Maurice (1980): Evolution d'un secteur de la marge nord-téthysienne en milieu pélagique: la zone briançonnaise près de Briançon entre le début du Malm et l'Eocène inférieur = Evolution of a sector of the pelagic environment of the North-Tethyan Platform in the Briançon area between the Malm and lower Eocene periods. Ph. D. Dissertation, Université Louis Pasteur, Strasbourg, France; https://tel.archives-ouvertes.fr/tel-00799263/, 2 volumes, 580 pp, https://store.pangaea.de/Projects/NOAA-MMS/These-Bourbon-T1-1980.pdf
    Details
    Publication Date: 2023-08-28
    Description: This text offers a general introduction to the geological history of the North-Tethys Platform from the Malm to the Lower Eocene periods. It is followed by three parts: a sedimentology development, a geochemical study and a part devoted to the reconstitution of the environment and the sedimentation rates, the subsidence, the depth and the morphology of the seabed and therefore the paleogeography of the Briançonnais domain. The last two chapters deal, one with the evolution of the Briançonnais domain in the context of events affecting Western Tethys and the Central Atlantic, and the other with two sedimentation models deduced from the previous study.
    Keywords: NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 6
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    Northern Finland Seismological Network (1980)
    GFZ Data Services
    Details
    Publication Date: 2023-05-12
    Description: Abstract
    Description: Sodankylä geophysical observatory (SGO) has operated in Sodankylä in northern Finland since 1913. SGO was originally founded by the Finnish Academy of Science and Letters. Now it takes care of national and international duties studying the space and geoenvironment as an independent research organisation in the University of Oulu. SGO performs long-term measurements, builds instruments, innovates and maintains domestic and international measurements, and performs research from these measurements. The seismic observations at SGO started in Sodankylä 1956. In 2005-2006 SGO seismic stations were updated to broadband instrumentation and connected to GEOFON data center. Today, the number of seismic stations has increased to 9. The stations have Streckeisen STS-2 or Nanometrics Trillium PA/PH broadband sensors. 3 of the stations are so called Posthole stations located in borehole 7-20 m below surface. The rest of the stations are located on the surface or in a more traditional type of vault. Data acquisition systems are either Earth Data PS6-24 digitisers and PC with Seiscomp or Nanometrics Centaurs. The continuous wave form data is collected at 100 Hz sampling frequency. The VH, LH and BH channel data is available from GEOFON data center and the 100Hz HH data from SGO by request. Further information about instrumentation can be found at the Institute’s web site (https://www.sgo.fi/). Waveform data are available from the GEOFON data centre, under network code FN, and arefully open.
    Keywords: geophysics ; seismology ; seismic noise ; earthquakes ; induced ; seismic hazard ; broad band ; velocity ; acceleration ; displacement ; Broadband seismic waveforms ; Seismic monitoring ; EARTH SCIENCE 〉 SOLID EARTH 〉 TECTONICS 〉 EARTHQUAKES ; In Situ/Laboratory Instruments 〉 Magnetic/Motion Sensors 〉 Seismometers ; In Situ Land-based Platforms 〉 GEOPHYSICAL STATIONS/NETWORKS ; In Situ Land-based Platforms 〉 GEOPHYSICAL STATIONS/NETWORKS 〉 SEISMOLOGICAL STATIONS
    Type: Dataset , Seismic Network
    Format: ~300G
    Format: .mseed
    Format: XML
    Location Call Number Expected Availability
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    DATA GFZ
  • 7
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    The Finnish National Seismic Network (1980)
    GFZ Data Services
    Details
    Publication Date: 2023-02-08
    Description: Abstract
    Description: The Institute of Seismology, University of Helsinki (ISUH) was founded in 1961 as a response to the growing public concern for environmental hazards caused by nuclear weapon testing. Since then ISUH has been responsible for seismic monitoring in Finland. The current mandate covers government regulator duties in seismic hazard mitigation and nuclear test ban treaty verification, observatory activities and operation of the Finnish National Seismic Network (FNSN) as well as research and teaching of seismology at the University of Helsinki.The first seismograph station of Finland was installed at the premises of the Department of Physics, University of Helsinki in 1924. However, the mechanical Mainka seismographs had low magnification and thus the recordings were of little practical value for the study of local seismicity. The first short-period seismographs were set up between 1956 and 1963. The next significant upgrade of FNSN occurred during the late 1970’s when digital tripartite arrays in southern and central Finland became fully operational, allowing for systematic use of instrumental detection, location and magnitude determination methods. By the end of the 1990’s, the entire network was operating using digital telemetric or dial-up methods. The FNSN has expanded significantly during the 21st Century. It comprises now 36 permanent stations. Most of the stations have Streckeisen STS-2, Nanometrics Trillium (Compact/P/PA/QA) or Guralp CMG-3T broad band sensors. Some Teledyne-Geotech S13/GS13 short period sensors are also in use. Data acquisition systems are a combination of Earth Data PS6-24 digitizers and PC with Seiscomp/Seedlink software or Nanometrics Centaurs. The stations are connected to the ISUH with Seedlink via Internet and provide continuous waveform data at 40 Hz (array) or 100-250 Hz sampling frequency. Further information about instrumentation can be found at the Institute’s web site (www.seismo.helsinki.fi). Waveform data are available from the GEOFON data centre, under network code HE, and arefully open.
    Keywords: geophysics ; seismology ; seismic noise ; earthquakes ; induced ; seismic hazard ; broad band ; velocity ; acceleration ; displacement ; Monitoring system ; Seismological stations ; In Situ/Laboratory Instruments 〉 Magnetic/Motion Sensors 〉 Seismometers ; In Situ Land-based Platforms 〉 GEOPHYSICAL STATIONS/NETWORKS
    Type: Dataset , Seismic Network
    Format: ~300G
    Format: .mseed
    Format: XML
    Location Call Number Expected Availability
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    DATA GFZ
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