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| Detailed Seamount Information |
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| Uo Mamae Seamount |    |
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| Index | SMNT-150S-1722W |
Classification | Small B1 Seamount |
| Location | 14º 57.54' S
172º 14.21' W |
Elongation
Irregularity | 1.43 ± 0.08
1.29 ± 0.09 |
| Plate Age | |
Oceanic Province | Abyssal Plain |
| Region | Samoan Hotspot Trail |
Alternative Names | Machias |
| Plate | Pacific Plate |
Age | 1 Ma |
| Tectonic Setting | Hotspot Trail |
Seamount Top | 645 m |
| Volume | 3246 km3 |
Ocean Bottom | 4785 m |
Shelf Edge
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Volcanic Activity | Extinct |
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| | Description | | Uo Mamae or Machias Guyot is located at 14¿ 57.5' S, 172¿ 14.2' W and is part of the Samoan Seamount Chain. The guyot is relatively small with a 60 km basal diameter and the top surface reaching -600 m. It is elongated in a NW-SE direction and has a flat area at ~750m that is about 2.5km wide and 8km long. The guyot is located near the bend in the Tonga Trench and is aligned subparallel to the local trend of the trench axis. The northwest flank of the seamount has several volcanic cones that are 1-4km in diameter and appear to postdate formation of the edifice. The seamount is capped by a carbonate platform and rock samples collected from the flanks had equal amounts of vesicular and massive basalt. |
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Uo Mamae Seamount -- Multibeam data merged with predicted satellite bathymetry |
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Uo Mamae Seamount -- Multibeam bathymetry |
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Uo Mamae Seamount -- Predicted satellite bathymetry |
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Uo Mamae Seamount -- Residual bathymetry |
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Samoan Hotspot Trail -- Multibeam bathymetry |
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Samoan Hotspot Trail -- Predicted satellite bathymetry |
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Samoan Hotspot Trail -- Tile 1 -- Multibeam data merged with predicted satellite bathymetry |
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Samoan Hotspot Trail -- Tile 1 -- Multibeam bathymetry |
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Samoan Hotspot Trail -- Tile 1 -- Predicted satellite bathymetry |
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Samoan Hotspot Trail -- Tile 1 -- Residual bathymetry |
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Samoan Hotspot Trail -- Tile 2 -- Multibeam data merged with predicted satellite bathymetry |
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Samoan Hotspot Trail -- Tile 2 -- Multibeam bathymetry |
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Samoan Hotspot Trail -- Tile 2 -- Predicted satellite bathymetry |
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Samoan Hotspot Trail -- Tile 2 -- Residual bathymetry |
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Uo Mamae Seamount -- Multibeam data merged with predicted satellite bathymetry |
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Uo Mamae Seamount -- Multibeam bathymetry |
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Uo Mamae Seamount -- Predicted satellite bathymetry |
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Uo Mamae Seamount -- Residual bathymetry |
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Samoan Hotspot Trail -- Multibeam bathymetry |
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Samoan Hotspot Trail -- Predicted satellite bathymetry |
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Samoan Hotspot Trail -- Tile 1 -- Multibeam data merged with predicted satellite bathymetry |
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Samoan Hotspot Trail -- Tile 1 -- Multibeam bathymetry |
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Samoan Hotspot Trail -- Tile 1 -- Predicted satellite bathymetry |
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Samoan Hotspot Trail -- Tile 1 -- Residual bathymetry |
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Samoan Hotspot Trail -- Tile 2 -- Multibeam data merged with predicted satellite bathymetry |
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Samoan Hotspot Trail -- Tile 2 -- Multibeam bathymetry |
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Samoan Hotspot Trail -- Tile 2 -- Predicted satellite bathymetry |
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Samoan Hotspot Trail -- Tile 2 -- Residual bathymetry |
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Coulbourn, W.T., Hill, P.J. and Bergersen, D.D. (1989). Machias Seamount, western Samoa; sediment remobilization, tectonic dismemberment and subduction of a guyot. Geo-Marine Letters 9(3): 119-125. |
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Hart, S.R. (2004). Collaborative research: The Samoan Hotspot, Past and Present. In: Collaborative research: The Samoan Hotspot, Past and Present. Woods Hole Oceanographic Institution, Woods Hole, MA. |
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Hill, P.J. and Tiffin, D.L. (1993). Geology, sediment patterns, and widespread deformation on the sea floor off Western Samoa revealed by wide-swath imagery. Geo-Marine Letters 13(2): 116-125. |
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Workman, R.K., Hart, S.R., Jackson, M., Regelous, M., Farley, K.A., Blusztajn, J., Kurz, M. and Staudigel, H. (2004). Recycled metasomatized lithosphere as the origin of the Enriched Mantle II (EM2) end-member: Evidence from the Samoan Volcanic Chain. Geochemistry Geophysics Geosystems 5: doi: 10.1029/2003GC000623. issn: 1525-2027. |
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Hart, S., Coetzee, M., Workman, R., Blusztajn, J., Johnson, K., Sinton, J., Steinberger, B. and Hawkins, J. (2004). Genesis of the Western Samoa seamount province: age, geochemical fingerprint and tectonics. Earth and Planetary Science Letters 227(1-2): 37-56. doi: 10.1016/j.epsl.2004.08.005. |
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| Depth |
Azimuth |
Area |
Length |
Width |
Elongation |
Contour |
Ellipse |
Irregularity |
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| m |
degrees |
km2 |
km |
km |
ratio |
km |
km |
ratio |
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| 2301 |
178.9 |
250.8 |
23.3 |
15.9 |
1.458 |
77.0 |
57.6 |
1.336 |
| 2715 |
182.5 |
377.3 |
28.3 |
19.0 |
1.487 |
95.7 |
70.9 |
1.350 |
| 3129 |
181.2 |
509.8 |
30.8 |
23.0 |
1.340 |
96.6 |
81.3 |
1.188 |
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| 49 % Multibeam Coverage |
1.43 ± 0.08 |
1.29 ± 0.09 |
| 4140 m High |
| 1 Summit |
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