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Gorda Ridge pp 201-210 | Cite as

An Electric Drill for Deep-Sea Coring

  • Patrick J. C. Ryall
Conference paper
  • 92 Downloads

Abstract

A series of drills has been developed at the Bedford Institute of Oceanography for collecting cores of hard rock from the ocean floor. Early deep-sea drills were hydrostatically powered and were principally employed on the Mid-Atlantic Ridge. However, these drills have been replaced by a deep-water version of an electric rock-core drill originally designed for continental shelf work. Part of the design philosophy behind these drills is operability from any research ship. To that end, the cable is mounted on a portable winch, and the workshops and controls are built into standard 20-foot containers.

The drill is driven by a 2,400-V electric motor powered and controlled from the ship through a contrahelically armored triaxial cable. Information from the drill, such as tilt angle, extension rate, down load, and flushing pressure, is multiplexed and transmitted up the cable. A television camera and light mounted on a pan and tilt unit have been added to the drill to aid site selection. Problems with interference and lighting have not been completely solved. The drill has been proved at depths of 3,500 m and on slopes of up to 30°. The drill was used in May 1986 to recover a short core of massive pyrite and pyrrhotite from the Middle Valley of the northern Juan de Fuca Ridge.

Keywords

Motor Current Short Core Fuca Ridge Empty Chamber Electric Drill 
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.

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References

  1. Ade-Hall JM, Aumento F, Ryall PJC, Gerstein RE, Brooke J, McKeown DL (1973) The Mid-Atlantic Ridge near 45°N. XXI. Magnetic results from basalt drill cores from the Median Valley. Can J Earth Sci 10:679–696.CrossRefGoogle Scholar
  2. Ballard RD, Holcomb RT, Andel TH (1979) The Galapagos Rift at 86°W. 3. Sheet flows collapse pits, and lava lakes of the rift valley. J Geophys Res 84:5407–5422.CrossRefGoogle Scholar
  3. Brooke J, Gilbert RLG (1968) Sea drilling technique of Bedford Institute. The development of the Bedford Institute deep sea drill. Deep-Sea Research 15:483–490.Google Scholar
  4. Brooke J, Irving E, Park JK (1970) The Mid-Atlantic Ridge near 45°N. XIII. Magnetic properties of basalt bore-core. Can J Earth Sci 7:1515–1527.CrossRefGoogle Scholar
  5. Davis EE, Goodfellow WD, Bornhold BD, et al. (1987) Massive sulphides in a sedimented rift valley, northern Juan de Fuca Ridge. Earth Planetary Sci Lett 82:49–61.CrossRefGoogle Scholar
  6. Davis RE, Williams DL, Von Herzen RP (1975) ARPA rock drill report. Unpublished manuscript, Technical Report WHOI 75–28.Google Scholar
  7. Fowler GA, Kingston PF (1975) An underwater drill for continental shelf exploration. J Soc Underwater Technol 1:4, 18–22.Google Scholar
  8. Inoue E, Maruyama S, Yuasa M, Oushika H (1978) Submerged rock drill MD-500H. Proceedings of 5th International Conference of Ocean Development, September 25–29, 1978, Tokyo, B2:41–46.Google Scholar
  9. Joly J (1914) On the investigation of the deep-sea deposits. Sci Proc R Dublin Soc N Ser XIV: 256–267.Google Scholar
  10. Kinoshita Y, Oshika H, Inoue E, (1977) A new type of submerged rock drill “MD-300PT.” Marine Geol 25:321–333.CrossRefGoogle Scholar
  11. Loncarevic BD, Mason CS, Matthews DH (1966) The Mid-Atlantic Ridge near 45°N. I. The Median Valley. Can J Earth Sci 3:327–349.CrossRefGoogle Scholar
  12. MacLean B, Jansa LF, Falconer, RKH, Srivastava SP (1977) Ordovician strata on the southeastern Baffin Island Shelf revealed by shallow drilling. Can J Earth Sci 14:1925–1939.CrossRefGoogle Scholar
  13. MacLean B, Falconer RKH, Clarke DB (1978) Tertiary basalts of western Davis Strait: Bedrock core samples and geophysical data. Can J Earth Sci 15:773–780.CrossRefGoogle Scholar
  14. McQuillin R, Ardus DA, (1977) Exploring the Geology of the Shelf Seas. London: Graham and Trotman, p. 234.Google Scholar
  15. Ryall PJC (1987) Remote drilling technology. Marine Mining 6:149–160.Google Scholar
  16. Ryall PJC, Fowler GA, Manchester KS (1981) An electric rock-core drill for deep ocean use. Proceedings of 13th Annual Offshore Technology Conference, Houston, pp 123–126.Google Scholar

Copyright information

© Springer-Verlag New York Inc. 1990

Authors and Affiliations

  • Patrick J. C. Ryall

There are no affiliations available

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