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Schmid, Florian; Molari, Massimiliano; Schlindwein, Vera; Kaul, Norbert E; 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. PANGAEA, https://doi.org/10.1594/PANGAEA.877640, Supplement to: Schmid, F et al. (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.
Size:
64 datasets

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Datasets listed in this publication series

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