TABLE 1.

Characteristics of Fe mats at Loihi, including total number of cells and oxide morphotypee

Sample locationSample no.Depth (m below sea level)Temp (°C)aMat density (g/ml)Total Fe (mg/g [dry wt])No. of cells (SD)bDilution seriescDominant morphotype(s)d
Pele's Pit, Ikaika vents, marker 20393, 1-41,317680.170552.93 × 108 (4.2 × 107)10−4Filaments
Pele's Pit, Ikaika vents, lower jets393, 5-81,2981670.268816.9 × 107 (1.6 × 107)10−7Amorphous
South rift, Naha vents, marker 1396, 2-41,325100.0971832.45 × 108 (7.94 × 107)10−6 (10−4 at 12°C)Filaments
Upper South rift, Pohaku vents, marker 27396, 61,196170.049779.33 × 107 (8.6 × 106)10−5Amorphous, sheaths
Upper South rift, Pohaku vents, marker 27396, 7-81,196170.1571531.26 × 108 (3.1 × 107)10−7Amorphous, filaments
Pele's Pit, Ikaika vents, lower jets397, 1-41,2951650.1401414.61 × 108 (6.5 × 107)10−6Amorphous
Pele's Pit, Ikaika vents, upper jets397, 51,289167NDNDNDNDAmorphous
Pele's Pit, Ikaika vents, near marker 15398, 5-61,2901130.1151521.54 × 108 (4 × 107)10−6Amorphous, filaments
  • a All temperatures are the maximums measured in the vent orifice closest to the sampling site.

  • b These values are expressed per milliliter (wet weight) of mat.

  • c The highest dilution in a series that yielded growth.

  • d The predominant iron oxide morphotypes (Fig. 4 and 5).

  • e ND, not determined.