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| Detailed Seamount Information |
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| Lalla Rookh Seamount |    |
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| Index | SMNT-129S-1757W |
Classification | Small A2 Seamount |
| Location | 12º 56.00' S
175º 39.97' W |
Elongation
Irregularity | 1.51 ± 0.16
1.12 ± 0.14 |
| Plate Age | |
Oceanic Province | Abyssal Plain |
| Region | Samoan Hotspot Trail |
Alternative Names | Home Knoll |
| Plate | Pacific Plate |
Age | 10 Ma |
| Tectonic Setting | Hotspot Trail |
Seamount Top | 30 m |
| Volume | 1560 km3 |
Ocean Bottom | 3440 m |
Shelf Edge
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Volcanic Activity | Extinct |
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| | Description | | Lalla Rookh is located at 12¿ 56 'S, 175¿ 40' W and is part of the Samoan Hotspot Trail on the Pacific Plate. The seamount is a shallow, flat topped, volcanic ridge. It is 3410 m tall with the top at -30 m and ocean bottom at -3440 m. It is fairly small with a volume of 1560 km3. The seamount is slightly elongated in a southwest, northeast direction with an azimuth of 221¿. The edges of the seamount are fairly smooth with little irregularity. Lalla Rookh is located to the southwest of Field Bank and has a similar morphology to Taviuni and Field Banks. |
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Lalla Rookh Seamount -- Multibeam data merged with predicted satellite bathymetry |
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Lalla Rookh Seamount -- Multibeam bathymetry |
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Lalla Rookh Seamount -- Predicted satellite bathymetry |
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Lalla Rookh 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 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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Samoan Hotspot Trail -- Tile 3 -- Multibeam data merged with predicted satellite bathymetry |
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Samoan Hotspot Trail -- Tile 3 -- Multibeam bathymetry |
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Samoan Hotspot Trail -- Tile 3 -- Predicted satellite bathymetry |
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Samoan Hotspot Trail -- Tile 3 -- Residual bathymetry |
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Lalla Rookh Seamount -- Multibeam data merged with predicted satellite bathymetry |
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Lalla Rookh Seamount -- Multibeam bathymetry |
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Lalla Rookh Seamount -- Predicted satellite bathymetry |
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Lalla Rookh 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 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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Samoan Hotspot Trail -- Tile 3 -- Multibeam data merged with predicted satellite bathymetry |
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Samoan Hotspot Trail -- Tile 3 -- Multibeam bathymetry |
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Samoan Hotspot Trail -- Tile 3 -- Predicted satellite bathymetry |
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Samoan Hotspot Trail -- Tile 3 -- Residual bathymetry |
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Brocher, T.M. (1985). On the age progression of the seamounts west of the Samoan Islands, SW Pacific. In: Investigations of the Northern Melanesian Borderland. Brocher, T.M. (Editors), Circum-Pacific Council for Energy and Mineral Resources, Houston. 3: 173-185. |
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Brocher, T.M. and Holmes, R. (1985). Tectonic and geochemical framework of the Northern Melanesian Borderland; an overview of the KK820316 Leg 2 objectives and results. In: Investigations of the northern Melanesian Borderland. Brocher, T.M. (Editors), Circum-Pacific Council for Energy and Mineral Resources, Houston. 3: 1-11. |
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Chaproniere, G.C.H. (1985). Late Tertiary and Quaternary foraminiferal biostratigraphy and paleobathymetry of cores and dredge samples from Cruise KK820316 Leg 2. In: Investigations of the northern Melanesian Borderland. Brocher, T.M. (Editors), Circum-Pacific Council for Energy and Mineral Resources, Houston. 3: 103-122. |
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Clouard, V. and Bonneville, A. (2001). Ages of seamounts, islands and plateaus on the Pacific plate. 1-42. |
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Duncan, R.A. (1985). Radiometric ages from volcanic rocks along the New Hebrides-Samoa Lineament. In: Investigations of the northern Melanesian Borderland. Brocher, T.M. (Editors), Circum-Pacific Council for Energy and Mineral Resources, Houston. 3: 67-76. |
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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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Keating, B.H. (1987). Summary of radiometric ages from the Pacific. In: Intergovernmental Oceanographic Comission technical series. UNESCO. 32. |
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Sinton, J.M., Johnson, K.T.M. and Price, R.C. (1985). Petrology and geochemistry of volcanic rocks from the Northern Melanesian Borderland. In: Investigations of the northern Melanesian Borderland. Brocher, T.M. (Editors), Circum-Pacific Council for Energy and Mineral Resources, Houston. 3: 35-65. |
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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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| 1053 |
220.6 |
61.4 |
11.6 |
7.2 |
1.622 |
29.8 |
29.0 |
1.027 |
| 1394 |
223.8 |
95.1 |
14.3 |
9.1 |
1.571 |
37.5 |
35.9 |
1.045 |
| 1735 |
219.2 |
155.9 |
18.3 |
13.8 |
1.327 |
57.4 |
44.9 |
1.278 |
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| 35 % Multibeam Coverage |
1.51 ± 0.16 |
1.12 ± 0.14 |
| 3410 m High |
| 1 Summit |
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