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Wheat, C Geoffrey; Hartwell, Anne M; McManus, James; Fisher, Andrew T; Orcutt, Beth N; Schlicht, Lucy E M; Niedenzu, Sara; Bach, Wolfgang (2019): Observations collected by AUV Sentry, ROV Jason-II (Dec 2013, AT26-09) and submersible ALVIN (Dec 2014, AT26-24) on Dorado Outcrop; chemical composition of rock samples, discrete temperature data and long-term temperature and dissolved oxygen data [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.900771, Supplement to: Wheat, CG et al. (2019): Geology and fluid discharge at Dorado Outcrop, a low temperature ridge-flank hydrothermal system. Geochemistry, Geophysics, Geosystems, 20(1), 487-504, https://doi.org/10.1029/2018GC007933

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Published: 2019-04-29 • DOI registered: 2019-06-04

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Abstract:
Two expeditions to Dorado Outcrop on the eastern flank of the East Pacific Rise and west of the Middle America Trench collected images, video, rocks, and sediment samples and measured temperature and fluid discharge rates to document the physical and biogeochemical characteristics of a regional, low‐temperature (~15 °C) hydrothermal system. Analysis of video and images identified lava morphologies: pillow, lobate, and sheet flows. Glasses from collected lavas were consistent with an off‐axis formation. Hydrothermal discharge generally occurs through pillow lavas but is patchy, sporadic, and sometimes ceases at particular sites of discharge. Yearlong temperature measurements at five of these discharge sites show daily ranges that oscillate with tidal frequencies by 6 °C or more. Instantaneous fluid discharge rates (0.16 to 0.19 L/s) were determined resulting in a calculated discharge of ~200 L/s when integrated over the area defined by the most robust fluid discharge. Such discharge has a power output of 10-12 MW. Hydrothermal seepage through thin sediment adjacent to the outcrop accounts for <3% of this discharge, but seepage may support an oxic sediment column. High extractable Mn concentrations and depleted δ13C in the low but variable organic solid phase suggest that hydrothermal fluids provide a source for manganese accumulation and likely enhance the oxidation of organic carbon. Comparisons of the physical and geochemical characteristics at Dorado and Baby Bare Outcrops, the latter being the only other site of ridge‐flank hydrothermal discharge that has been sampled directly, suggest commonalities and differences that have implications for future discoveries.
Keyword(s):
Dorado Outcrop; hydrothermal fluid discharge; ridge flank; seafloor geology; sediment
Coverage:
Median Latitude: 9.082866 * Median Longitude: -79.619396 * South-bound Latitude: 9.000000 * West-bound Longitude: -87.116499 * North-bound Latitude: 9.098669 * East-bound Longitude: 87.110821
Date/Time Start: 2013-12-08T00:00:00 * Date/Time End: 2014-12-11T00:00:00
License:
Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International (CC-BY-NC-ND-4.0)
Size:
18 datasets

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Datasets listed in this publication series

  1. Wheat, CG; Hartwell, AM; McManus, J et al. (2019): (Supplemental Material, Table 1) Observations from images collected by the autonomous underwater vehicle Sentry on Dorado Outcrop, December 2013 (AT26-09). https://doi.org/10.1594/PANGAEA.900674
  2. Wheat, CG; Hartwell, AM; McManus, J et al. (2019): (Supplemental Materials, Table 2) Observations from images collected by the remotely operated vehicle Jason-II on Dorado Outcrop, December 2013 (AT26-09). https://doi.org/10.1594/PANGAEA.900675
  3. Wheat, CG; Hartwell, AM; McManus, J et al. (2019): (Supplemental Materials, Table 3) Observations from images collected by the Submersible ALVIN on Dorado Outcrop, December 2014 (AT26-24). https://doi.org/10.1594/PANGAEA.900686
  4. Wheat, CG; Hartwell, AM; McManus, J et al. (2019): (Suppplemental Materials, Table 4) Location and depth of rock samples collected during AT26-09 and AT26-24 from Dorado Outcrop. https://doi.org/10.1594/PANGAEA.900700
  5. Wheat, CG; Hartwell, AM; McManus, J et al. (2019): (Supplemental Materials, Table 5) Major and trace elements compositions of fresh glass samples recovered during AT26-09 and AT26-24 from Dorado Outcrop. https://doi.org/10.1594/PANGAEA.900762
  6. Wheat, CG; Hartwell, AM; McManus, J et al. (2019): (Supplemental Materials, Table 5) Major and trace elements compositions of altered rock samples recovered during AT26-09 and AT26-24 from Dorado Outcrop. https://doi.org/10.1594/PANGAEA.900759
  7. Wheat, CG; Hartwell, AM; McManus, J et al. (2019): (Supplemental Materials, Table 6) Additional trace elements compositions of fresh glass samples recovered during AT26-09 and AT26-24 from Dorado Outcrop. https://doi.org/10.1594/PANGAEA.900768
  8. Wheat, CG; Hartwell, AM; McManus, J et al. (2019): (Supplemental Materials, Table 6) Additional trace elements compositions of altered rock samples recovered during AT26-09 and AT26-24 from Dorado Outcrop. https://doi.org/10.1594/PANGAEA.900766
  9. Wheat, CG; Hartwell, AM; McManus, J et al. (2019): (Supplemental Material, Table 7) Temperature data from probes inserted in cracks, crevices, and shallow sediment in search of hydrothermal discharge from Dorado Outcrop (AT26-09 and AT26-24). https://doi.org/10.1594/PANGAEA.900704
  10. Wheat, CG; Hartwell, AM; McManus, J et al. (2019): (Supplemental Materials, Table 8) Temperature data (Sensor 768600) recorded from December 2013 (deployed on AT26-09) to December 2014 (Recovered on AT26-24) at Marker D on Dorado Outcrop. https://doi.org/10.1594/PANGAEA.900732
  11. Wheat, CG; Hartwell, AM; McManus, J et al. (2019): (Supplemental Materials, Table 9) Temperature data (Sensor 768601) recorded from December 2013 (deployed on AT26-09) to December 2014 (Recovered on AT26-24) at Marker A on Dorado Outcrop. https://doi.org/10.1594/PANGAEA.900731
  12. Wheat, CG; Hartwell, AM; McManus, J et al. (2019): (Supplemental Materials, Table 10) Temperature data (Sensor 768602) recorded from December 2013 (deployed on AT26-09) to December 2014 (Recovered on AT26-24) at Marker M on Dorado Outcrop. https://doi.org/10.1594/PANGAEA.900734
  13. Wheat, CG; Hartwell, AM; McManus, J et al. (2019): (Supplemental Materials, Table 11) Temperature data (Sensor 768604) recorded from December 2013 (deployed on AT26-09) to December 2014 (Recovered on AT26-24) at Marker K on Dorado Outcrop. https://doi.org/10.1594/PANGAEA.900739
  14. Wheat, CG; Hartwell, AM; McManus, J et al. (2019): (Supplemental Materials, Table 12) Temperature data (Sensor 768616) recorded from December 2013 (deployed on AT26-09) to December 2014 (Recovered on AT26-24) at Marker R on Dorado Outcrop. https://doi.org/10.1594/PANGAEA.900735
  15. Wheat, CG; Hartwell, AM; McManus, J et al. (2019): (Supplementary Materials, Table 13) Temperature and dissolved oxygen in situ sensor data collected from RBR prototype instruments deployed in 2014 at Dorado Outcrop, first deployment Marker K/W. https://doi.org/10.1594/PANGAEA.900743
  16. Wheat, CG; Hartwell, AM; McManus, J et al. (2019): (Supplementary Materials, Table 13) Temperature and dissolved oxygen in situ sensor data collected from RBR prototype instruments deployed in 2014 at Dorado Outcrop, first deployment Marker R. https://doi.org/10.1594/PANGAEA.900744
  17. Wheat, CG; Hartwell, AM; McManus, J et al. (2019): (Supplementary Materials, Table 13) Temperature and dissolved oxygen in situ sensor data collected from RBR prototype instruments deployed in 2014 at Dorado Outcrop, second deployment Marker K/W. https://doi.org/10.1594/PANGAEA.900745
  18. Wheat, CG; Hartwell, AM; McManus, J et al. (2019): (Supplementary Materials, Table 13) Temperature and dissolved oxygen in situ sensor data collected from RBR prototype instruments deployed in 2014 at Dorado Outcrop, second deployment Marker R. https://doi.org/10.1594/PANGAEA.900746