Geo-Marine Letters

, Volume 12, Issue 4, pp 208–213 | Cite as

Fe−Mn nodule field indicated by GLORIA, north of the Puerto Rico Trench

  • Kathryn M. Scanlon
  • Douglas G. Masson


A 2,500-km2 area of sea floor on the south-eastern flank of the Greater Antilles Outer Ridge north of the Puerto Rico Trench displays anomalously high acoustic backscattering properties on GLORIA longrange sidescan-sonar data. Previously collected dredges, bottom photographs, and sediment cores indicate the presence of Fe−Mn nodules within the area of high backscatter. We were able to map the extent of the inferred nodule field on the basis of acoustic property contrast between the nodule-covered sediment and the surrounding nodule-free sediment.


Nodule Trench Longrange Sediment Core Acoustic Property 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Chavez, P.S., Jr., 1986. Processing techniques for digital sonar images from GLORIA.Photogrammetric Engineering and Remote Sensing 52:1133–1145.Google Scholar
  2. EEZ-SCAN 85 Scientific Staff, 1987. Atlas of the US Exclusive Economic Zone, Eastern Caribbean. US Geological Survey Miscellaneous Investigations Series I-1864-B, 58 pp. scale 1:500,000.Google Scholar
  3. Hugget, Q.J., and Somers, M.L., 1988. Possibilities of using the GLORIA system for manganese nodule assessment.Marine Geophysical Researches 9:255–264.Google Scholar
  4. Kidd, R.B., Simm, R.W., and Searle, R.C., 1985. Sonar acoustic facies and sediment distribution on an area of the deep ocean floor.Marine and Petroleum Geology 2:210–221.Google Scholar
  5. Klitgord, K.D., and Schouten, H., 1986. Plate kinematics of the central Atlantic. In: Vogt, P.R., and Tucholke, B.E. (Eds.), The Western North Atlantic Region. v. M: The Geology of North America. Geological Society of America, Boulder, Colorado, pp. 341–350.Google Scholar
  6. Masson, D.G., and Scanlon, K.M., 1991. The neotectonic setting of Puerto Rico:Geological Society of America Bulletin 103:144–154.Google Scholar
  7. Rawson, M.D., and Ryan, W.B.F., 1978. Ocean floor sediment and polymetallic nodules. Mercator projection, 1:23,230,300 scale, Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York.Google Scholar
  8. Savit, C.H., Knox, W.A., Blue, D.M., and Paitson, L., 1964. Reflection and velocity profiles at the Outer Ridge, Puerto Rico.Journal of Geophysical Research 69:701–719.Google Scholar
  9. Scanlon, K.M., Masson, D.G., and Rodriguez, R.W., 1988. GLORIA sidescan-sonar survey of the EEZ of Puerto Rico and the US Virgin Islands. Transactions 11th Caribbean Conference, Government Printery. Bridgetown, Barbados 1986, pp. 32:1–32:9.Google Scholar
  10. Somers, M.L., Carson, R.M., Revie, J.A., Edge, R.H., Barrow, B.J., and Andrews, A.G., 1978. Gloria II—an improved long range sidescan sonar.Oceanology International 78, BPS Publications, London. pp. 16–26.Google Scholar
  11. Tucholke, B.E., 1974. The history of sedimentation and abyssal circulation on the Greater Antilles Outer Ridge. Unpublished PhD Dissertation. Woods Hole Oceanographic Institution/Massachusetts Institute of Technology. 314 pp.Google Scholar
  12. Tucholke, B.E., 1975. Sediment distribution and deposition by the Western Boundary Undercurrent: The Greater Antilles Outer Ridge.Journal of Geology 83:177–207.Google Scholar
  13. Tucholke, B.E., and Ewing, J.I., 1974. Bathymetry and sediment geometry of the Greater Antilles Outer Ridge and vicinity.Geological Society of America Bulletin 85:1789–1802.Google Scholar
  14. Tucholke, B.E., Wright, W.R., and Hollister, C.D., 1973. Abyssal circulation over the Greater Antilles Outer Ridge.Deep-Sea Research 20:973–995.Google Scholar

Copyright information

© Springer-Verlag New York Inc. 1992

Authors and Affiliations

  • Kathryn M. Scanlon
    • 1
  • Douglas G. Masson
    • 2
  1. 1.US Geological SurveyWoods HoleUSA
  2. 2.Institute of Oceanographic SciencesWormleyUK

Personalised recommendations