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| Detailed Seamount Information |
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| Alexa Seamount |    |
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| Index | SMNT-116S-1753E |
Classification | Seamount |
| Location | 11º 36.00' S
175º 18.00' E |
Elongation
Irregularity |
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| Plate Age | |
Oceanic Province | |
| Region | Samoan Hotspot Trail |
Alternative Names | |
| Plate | Pacific Plate |
Age | 35 Ma |
| Tectonic Setting | Hotspot Trail |
Seamount Top | |
| Volume | |
Ocean Bottom | |
Shelf Edge
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Volcanic Activity | Extinct |
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| | Description | | Alexa Seamount is located at 11¿ 36' S, 175¿ 18' E and is part of the Samoan Hotspot Trail on the Pacific Plate. The seamount is saucer shaped with a steep southern flank that may be partially subducted. It has 0.8-1.6 km of carbonate sedimentary cover on its summit. |
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Alexa Seamount -- Predicted satellite bathymetry |
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Samoan Hotspot Trail -- Multibeam bathymetry |
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Samoan Hotspot Trail -- Predicted satellite bathymetry |
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Alexa Seamount -- Predicted satellite bathymetry |
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Samoan Hotspot Trail -- Multibeam bathymetry |
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Samoan Hotspot Trail -- Predicted satellite 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. (1985). On the formation of the Vitiaz Trench lineament and North Fiji Basin. In: Investigations of the northern Melanesian Borderland. Brocher, T.M. (Editors), Circum-Pacific Council for Energy and Mineral Resources, Houston. 3: 13-33. |
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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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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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