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Keir, Robin; Schmale, Oliver; Walter, Maren; Sültenfuß, Jürgen; Seifert, Richard; Rhein, Monika (2008): Methane, helium isotope and hydrogen data from the Nibelungen hydrothermal area, Mid Atlantic Ridge [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.706730, Supplement to: Keir, R et al. (2008): Flux and dispersion of gases from the "Drachenschlund" hydrothermal vent at 8°18'S, 13°30'W on the Mid-Atlantic Ridge. Earth and Planetary Science Letters, 270, 338-348, https://doi.org/10.1016/j.epsl.2008.03.054

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Abstract:
Hydrothermal emission of mantle helium appears to be directly related to magma production rate, but other processes can generate methane and hydrogen on mid-ocean ridges. In an on-going effort to characterize these processes in the South Atlantic, the flux and distribution of these gases were investigated in the vicinity of a powerful black smoker recently discovered at 8°17.9' S, 13°30.4' W. The vent lies on the shoulder of an oblique offset in the Mid-Atlantic Ridge and discharges high concentrations of methane and hydrogen. Measurements during expeditions in 2004 and 2006 show that the ratio of CH4 to 3He in the neutrally buoyant plume is quite high, 4 x 10**8. The CTD stations were accompanied by velocity measurements with lowered acoustic Doppler current profilers (LADCP), and from these data we estimate the methane transport to have been 0.5 mol/sec in a WSW-trending plume that seems to develop during the ebb tidal phase. This transport is an order of magnitude greater than the source of CH4 calculated from its concentration in the vent fluid and the rise height of the plume. From this range of methane fluxes, the source of 3He is estimated to be between 0.14 and 1.2 nmol/sec. In either case, the 3He source is significantly lower than expected from the spreading rate of the Mid-Atlantic Ridge. From the inventory of methane in the rift valley adjacent to the vent, it appears that the average specific rate of oxidation is 2.6 to 23/yr, corresponding to a turnover time between 140 and 16 days. Vertical profiles of methane in the surrounding region often exhibited Gaussian-like distributions, and the variances appear to increase with distance from the vent. Using a Gaussian plume model, we obtained a range of vertical eddy diffusivities between 0.009 and 0.08 m2m2/sec. These high values may be due to tidally driven internal waves across the promontory on which the vent is located.
Project(s):
From Mantle to Ocean: Energy-, Material- and Life-cycles at Spreading Axes (DERIDGE)
Funding:
German Research Foundation (DFG), grant/award no. 5471797: From Mantle to Ocean: Energy-, Material- and Life-cycles at Spreading Axes
Coverage:
Median Latitude: -8.284289 * Median Longitude: -13.531668 * South-bound Latitude: -8.345000 * West-bound Longitude: -13.635000 * North-bound Latitude: -8.166670 * East-bound Longitude: -13.451660
Date/Time Start: 2004-11-29T00:00:00 * Date/Time End: 2006-05-25T10:03:00
Event(s):
M62/5a-1211-CTD-LADCP * Latitude: -8.300000 * Longitude: -13.573330 * Date/Time: 2004-11-29T00:00:00 * Elevation: -3414.0 m * Location: South Atlantic/subtropical * Campaign: M62/5a * Basis: Meteor (1986) * Method/Device: Multiple investigations (MULT) * Comment: CTD + LADCP, 5 water samples taken, MAPR attached
M62/5a-1212-CTD-LADCP * Latitude: -8.300000 * Longitude: -13.600000 * Date/Time: 2004-11-29T00:00:00 * Elevation: -2996.0 m * Location: South Atlantic/subtropical * Campaign: M62/5a * Basis: Meteor (1986) * Method/Device: Multiple investigations (MULT) * Comment: CTD + LADCP, 6 water samples taken, MAPR attached
M62/5a-1214-CTD-LADCP * Latitude: -8.345000 * Longitude: -13.575000 * Date/Time: 2004-11-29T00:00:00 * Elevation: -3165.0 m * Location: South Atlantic/subtropical * Campaign: M62/5a * Basis: Meteor (1986) * Method/Device: Multiple investigations (MULT) * Comment: CTD + LADCP, 5 water samples taken, MAPR attached
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
53 datasets

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Datasets listed in this publication series

  1. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5a-1211-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706683
  2. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5a-1212-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706684
  3. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5a-1214-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706685
  4. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5a-1215-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706686
  5. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5a-1216-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706687
  6. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5a-1217-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706688
  7. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1222-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706689
  8. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1223-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706690
  9. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1224-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706691
  10. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1225-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706692
  11. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1226-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706693
  12. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1227-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706694
  13. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1228-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706695
  14. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1229-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706696
  15. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1230-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706697
  16. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1231-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706698
  17. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1233-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706699
  18. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1234-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706700
  19. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1237-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706701
  20. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1238-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706702
  21. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1239-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706703
  22. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1240-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706704
  23. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1253-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706705
  24. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1254-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706706
  25. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1255-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706707
  26. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1256-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706708
  27. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1257-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706709
  28. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1259-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706710
  29. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1260-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706711
  30. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1261-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706712
  31. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1262-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706713
  32. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1265-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706714
  33. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1266-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706715
  34. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1267-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706716
  35. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1269-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706717
  36. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1270-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706718
  37. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1271-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706719
  38. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1273-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706720
  39. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1274-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706721
  40. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1275-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706722
  41. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1276-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706723
  42. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1279-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706724
  43. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1287-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706725
  44. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1289-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706726
  45. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane and helium isotope data in water profile M62/5b-1290-CTD-LADCP. https://doi.org/10.1594/PANGAEA.706727
  46. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane, helium isotope and hydrogen data in water profile M68/1-43-CTD. https://doi.org/10.1594/PANGAEA.706674
  47. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane, helium isotope and hydrogen data in water profile M68/1-47-CTD. https://doi.org/10.1594/PANGAEA.706675
  48. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane, helium isotope and hydrogen data in water profile M68/1-49-CTD. https://doi.org/10.1594/PANGAEA.706676
  49. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane, helium isotope and hydrogen data in water profile M68/1-50-CTD. https://doi.org/10.1594/PANGAEA.706677
  50. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane, helium isotope and hydrogen data in water profile M68/1-51-CTD. https://doi.org/10.1594/PANGAEA.706678
  51. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane, helium isotope and hydrogen data in water profile M68/1-52-CTD. https://doi.org/10.1594/PANGAEA.706679
  52. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane, helium isotope and hydrogen data in water profile M68/1-59-CTD. https://doi.org/10.1594/PANGAEA.706680
  53. Keir, R; Schmale, O; Walter, M et al. (2008): (Appendix A) Methane, helium isotope and hydrogen data in water profile M68/1-64-CTD. https://doi.org/10.1594/PANGAEA.706681