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Schmid, Florian; Molari, Massimiliano; Schlindwein, Vera; Kaul, Norbert; Bach, Wolfgang; Vogt, Martin; Jöns, Niels; Hansen, Christian T; Walter, Maren; Damm, Ellen; Boetius, Antje (2017): Marine heat flow data from the South West Indian Ridge during POLARSTERN cruise ANT-XXIX/8 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.877640, Supplement to: Schmid, Florian; Schlindwein, Vera (submitted): Lithospheric strength, thermal structure, diffusive geochemical fluxes and microbial activity in the ultraslow spreading Southwest Indian Ridge axial valley. Geochemistry, Geophysics, Geosystems

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Abstract:
The relation of tectonics and geochemical cycling at magma-starved ultraslow spreading ridges are hardly understood. Here we present yield-strength profiles, heat flow determinations, geochemical- and microbiological results from the axial valley of the Oblique Supersegment at the Southwest Indian Ridge. Our results report a rheologically weak lithosphere down to 18 km and a very low heat flow of 63.4 - 82.5 mW/m² at the brittle-ductile transition. This is best explained by serpentinization possibly focused in shear zones of deep reaching boundary faults. The axial valley sediments, especially in the deepest areas, are enriched in organic carbon due to high primary productivity and efficient downslope sediment transportation. The microbial activity is comparable inside and outside the valley and appears strongest at a site where we discovered a bivalve that is endemic to hydrothermal- or reducing habitats. We did not find any site of active hydrothermal discharge. Pore water geochemical profiles are contrary to the local temperature and heat flow values and show high diffusive upward fluxes at sites of low heat flow and vice versa. Biogeochemical processes in the axial valley sediments appear strongly influenced by the accumulation and subsequent remineralization of organic matter. Increasing flux rates towards the boundary faults indicate a diffuse, sluggish fluid circulation in these fault zones.
Coverage:
Median Latitude: -51.949067 * Median Longitude: 14.222729 * South-bound Latitude: -54.974670 * West-bound Longitude: 12.495330 * North-bound Latitude: -48.731170 * East-bound Longitude: 17.390000
Date/Time Start: 2013-11-15T02:07:00 * Date/Time End: 2013-12-11T16:41:00
Comment:
Marine heat flow data were acquired along the western part of the South West Indian Ridge (SWIR) between 13°-15.5°E, the so-called Oblique Supersegment This was done using the Bremen 6 m heat flow probe. It contains 21 channels, spaced at 26 cm, resulting in 21 in-situ temperatures an thermal conductivity measurements.
Data reduction and geothermal heat flow determation was done using the algorithm according to Villinger & Davis (1987).
42 new heat flow determinations on and near the SWIR east of the Bouvet Triple Junction.
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
64 datasets

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Datasets listed in this publication series

  1. Vogt, M; Walter, M; Schmid, F (2017): Helium 3 isotope concentrations above the Southwest Indian Ridge during POLARSTERN cruise ANT-XXIX/8. https://doi.org/10.1594/PANGAEA.882064
  2. Bach, W; Jöns, N; Hansen, CT et al. (2017): Concentrations of total dissolved manganese and methane in the water column above the Southwest Indian Ridge during POLARSTERN cruise ANT-XXIX/8. https://doi.org/10.1594/PANGAEA.881316
  3. Kaul, N (2017): Heat flow data at station PS81/603-1. https://doi.org/10.1594/PANGAEA.877596
  4. Kaul, N (2017): Heat flow data at station PS81/603-2. https://doi.org/10.1594/PANGAEA.877597
  5. Kaul, N (2017): Heat flow data at station PS81/604-1. https://doi.org/10.1594/PANGAEA.877598
  6. Kaul, N (2017): Heat flow data at station PS81/604-2. https://doi.org/10.1594/PANGAEA.877599
  7. Kaul, N (2017): Heat flow data at station PS81/604-3. https://doi.org/10.1594/PANGAEA.877600
  8. Molari, M; Boetius, A (2017): Geochemistry of sediment core PS81/606-1. https://doi.org/10.1594/PANGAEA.881929
  9. Kaul, N (2017): Heat flow data at station PS81/607-1. https://doi.org/10.1594/PANGAEA.877601
  10. Kaul, N (2017): Heat flow data at station PS81/608-1. https://doi.org/10.1594/PANGAEA.877602
  11. Kaul, N (2017): Heat flow data at station PS81/620-1. https://doi.org/10.1594/PANGAEA.877603
  12. Kaul, N (2017): Heat flow data at station PS81/620-2. https://doi.org/10.1594/PANGAEA.877604
  13. Kaul, N (2017): Heat flow data at station PS81/620-3. https://doi.org/10.1594/PANGAEA.877605
  14. Molari, M; Boetius, A (2017): Geochemistry of porewater of sediment core PS81/626-1. https://doi.org/10.1594/PANGAEA.881918
  15. Molari, M; Boetius, A (2017): Geochemistry of sediment core PS81/626-1. https://doi.org/10.1594/PANGAEA.881930
  16. Kaul, N (2017): Heat flow data at station PS81/635-1. https://doi.org/10.1594/PANGAEA.877606
  17. Kaul, N (2017): Heat flow data at station PS81/635-2. https://doi.org/10.1594/PANGAEA.877607
  18. Molari, M; Boetius, A (2017): Geochemistry of porewater of sediment core PS81/636-1. https://doi.org/10.1594/PANGAEA.881919
  19. Molari, M; Boetius, A (2017): Geochemistry of sediment core PS81/636-1. https://doi.org/10.1594/PANGAEA.881931
  20. Molari, M; Boetius, A (2017): Geochemistry of porewater of sediment core PS81/639-1. https://doi.org/10.1594/PANGAEA.881920
  21. Molari, M; Boetius, A (2017): Geochemistry of sediment core PS81/639-1. https://doi.org/10.1594/PANGAEA.881932
  22. Kaul, N (2017): Heat flow data at station PS81/640-1. https://doi.org/10.1594/PANGAEA.877608
  23. Kaul, N (2017): Heat flow data at station PS81/640-2. https://doi.org/10.1594/PANGAEA.877609
  24. Kaul, N (2017): Heat flow data at station PS81/640-3. https://doi.org/10.1594/PANGAEA.877610
  25. Kaul, N (2017): Heat flow data at station PS81/643-1. https://doi.org/10.1594/PANGAEA.877611
  26. Kaul, N (2017): Heat flow data at station PS81/643-2. https://doi.org/10.1594/PANGAEA.877612
  27. Kaul, N (2017): Heat flow data at station PS81/643-3. https://doi.org/10.1594/PANGAEA.877613
  28. Kaul, N (2017): Heat flow data at station PS81/644-1. https://doi.org/10.1594/PANGAEA.877614
  29. Kaul, N (2017): Heat flow data at station PS81/644-2. https://doi.org/10.1594/PANGAEA.877615
  30. Kaul, N (2017): Heat flow data at station PS81/644-3. https://doi.org/10.1594/PANGAEA.877616
  31. Molari, M; Boetius, A (2017): Geochemistry of porewater of sediment core PS81/649-1. https://doi.org/10.1594/PANGAEA.881921
  32. Molari, M; Boetius, A (2017): Geochemistry of sediment core PS81/649-1. https://doi.org/10.1594/PANGAEA.881933
  33. Molari, M; Boetius, A (2017): Geochemistry of porewater of sediment core PS81/652-1. https://doi.org/10.1594/PANGAEA.881922
  34. Molari, M; Boetius, A (2017): Geochemistry of sediment core PS81/652-1. https://doi.org/10.1594/PANGAEA.881934
  35. Molari, M; Boetius, A (2017): Geochemistry of porewater of sediment core PS81/653-1. https://doi.org/10.1594/PANGAEA.881923
  36. Molari, M; Boetius, A (2017): Geochemistry of sediment core PS81/653-1. https://doi.org/10.1594/PANGAEA.881935
  37. Kaul, N (2017): Heat flow data at station PS81/655-1. https://doi.org/10.1594/PANGAEA.877617
  38. Kaul, N (2017): Heat flow data at station PS81/655-4. https://doi.org/10.1594/PANGAEA.877618
  39. Kaul, N (2017): Heat flow data at station PS81/655-5. https://doi.org/10.1594/PANGAEA.877619
  40. Molari, M; Boetius, A (2017): Geochemistry of porewater of sediment core PS81/656-1. https://doi.org/10.1594/PANGAEA.881924
  41. Molari, M; Boetius, A (2017): Geochemistry of sediment core PS81/656-1. https://doi.org/10.1594/PANGAEA.881936
  42. Molari, M; Boetius, A (2017): Geochemistry of porewater of sediment core PS81/657-1. https://doi.org/10.1594/PANGAEA.881925
  43. Molari, M; Boetius, A (2017): Geochemistry of sediment core PS81/657-1. https://doi.org/10.1594/PANGAEA.881937
  44. Molari, M; Boetius, A (2017): Geochemistry of porewater of sediment core PS81/659-1. https://doi.org/10.1594/PANGAEA.881926
  45. Molari, M; Boetius, A (2017): Geochemistry of sediment core PS81/659-1. https://doi.org/10.1594/PANGAEA.881938
  46. Molari, M; Boetius, A (2017): Geochemistry of porewater of sediment core PS81/661-1. https://doi.org/10.1594/PANGAEA.881927
  47. Molari, M; Boetius, A (2017): Geochemistry of sediment core PS81/661-1. https://doi.org/10.1594/PANGAEA.881939
  48. Kaul, N (2017): Heat flow data at station PS81/665-1. https://doi.org/10.1594/PANGAEA.877620
  49. Kaul, N (2017): Heat flow data at station PS81/665-2. https://doi.org/10.1594/PANGAEA.877621
  50. Kaul, N (2017): Heat flow data at station PS81/665-3. https://doi.org/10.1594/PANGAEA.877622
  51. Kaul, N (2017): Heat flow data at station PS81/675-1. https://doi.org/10.1594/PANGAEA.877623
  52. Kaul, N (2017): Heat flow data at station PS81/675-2. https://doi.org/10.1594/PANGAEA.877624
  53. Kaul, N (2017): Heat flow data at station PS81/676-1. https://doi.org/10.1594/PANGAEA.877625
  54. Kaul, N (2017): Heat flow data at station PS81/676-2. https://doi.org/10.1594/PANGAEA.877626
  55. Kaul, N (2017): Heat flow data at station PS81/677-1. https://doi.org/10.1594/PANGAEA.877627
  56. Kaul, N (2017): Heat flow data at station PS81/677-2. https://doi.org/10.1594/PANGAEA.877628
  57. Kaul, N (2017): Heat flow data at station PS81/677-3. https://doi.org/10.1594/PANGAEA.877629
  58. Kaul, N (2017): Heat flow data at station PS81/678-1. https://doi.org/10.1594/PANGAEA.877630
  59. Kaul, N (2017): Heat flow data at station PS81/678-2. https://doi.org/10.1594/PANGAEA.877637
  60. Kaul, N (2017): Heat flow data at station PS81/678-3. https://doi.org/10.1594/PANGAEA.877638
  61. Kaul, N (2017): Heat flow data at station PS81/679-2. https://doi.org/10.1594/PANGAEA.877633
  62. Kaul, N (2017): Heat flow data at station PS81/679-3. https://doi.org/10.1594/PANGAEA.877634
  63. Molari, M; Boetius, A (2017): Geochemistry of porewater of sediment core PS81/681-1. https://doi.org/10.1594/PANGAEA.881928
  64. Molari, M; Boetius, A (2017): Geochemistry of sediment core PS81/681-1. https://doi.org/10.1594/PANGAEA.881940