Geologists Seamounts
| Geologists Seamounts | |
|---|---|
 Bathymetric map of the south-west Geologists Seamounts | |
  Location within Pacific Ocean | |
| Location | |
| Location | North Pacific Ocean |
| Coordinates | 18°40′N 157°40′W / 18.667°N 157.667°W[1] |
| Geology | |
| Age of rock | Cretaceous |
Geologists Seamounts (alternatively were named South West Hawaii Group[2]) are a cluster of seamounts in the Pacific Ocean, located mainly 100 miles (160 km) south of Oahu, Hawaii[3] and 100–200 kilometres (62–124 mi)[4] south-west from Big Island (Hawaiʻi).[5] Clockwise from north they are named Perret, Jaggar, McCall, Pensacola, Daly, Swordfish, Cross, Washington and Ellis.[6] The Kauluakalana seamount to the north of Oahu on the far side of the Hawaiian chain to the other seamounts of the cluster, and south-east of the Musicians Seamounts has reason to be regarded as part of the Geologists Seamounts,[7] but would not so be grouped logically by the former name for the cluster.
Geology
[edit]The mountains have a height above seafloor of about 5 kilometres (3.1 mi). They developed on a mid-ocean ridge[8] during the Cretaceous,[9] about 80 million years ago, and there is no geological relationship to the neighbouring Hawaiian Islands.[4] There is about contemporaneous timing with the formation of the Musicians Seamounts to the north-west of Oahu and Hawaiʻi, from the limited sampling and analysis to date.[10] Ages that have been obtained include 80.5 Ma for Kauluakalana, 84.5 Ma for Cross and 82.7 Ma for McCall.[7] Rocks dredged from the seamounts include iron-manganese crusts, carbonates and basalts.[11][12]
Ecology
[edit]Corals and sponges have been recorded at the south-western Swordfish Seamount at a depth of 1,071 m (3,514 ft) with plexauridae, alcyonacea, and coralliidae corals.[13] The deeper coral community on Ellis Seamount at a depth of 2,135 m (7,005 ft) was less diverse with bamboo corals dominant,[13] but coverage is still widespread.[14]
References
[edit]- 1 2 Kelley et al. 2020, p. 5.
- ↑ Wessel, P.; Keating, B. H. (10 February 1994). "Temporal variations of flexural deformation in Hawaii". Journal of Geophysical Research: Solid Earth. 99 (B2): 2751. Bibcode:1994JGR....99.2747W. doi:10.1029/93JB02876.
- ↑ Elliott, Kelley (2015). "Project instruction for EX-15-04 Leg 3 : CAPSTONE NWHI Exploration, Leg III". NOAA: 3. doi:10.7289/V5DB7ZVQ. Retrieved 25 March 2018.
- 1 2 Wessel, P.; Lyons, S. (10 October 1997). "Distribution of large Pacific seamounts from Geosat/ERS-1: Implications for the history of intraplate volcanism". Journal of Geophysical Research: Solid Earth. 102 (B10): 22467. Bibcode:1997JGR...10222459W. doi:10.1029/97JB01588.
- ↑ Wessel 1998, p. 403.
- ↑ "APPLICATION BRIEFS 2008" (PDF). University of Hawaii. 2008. p. 15. Retrieved 25 March 2018.
- 1 2 Clouard, V.; Bonneville, A. (2005). "Ages of seamounts, islands, and plateaus on the Pacific plate" (PDF). In Foulger, G.R.; Natland, J.H.; Presnall, D.C.; Anderson, D.L. (eds.). Plates, plumes, and paradigms:Geological Society of America Special Paper 388. Geological Society of America. pp. 71–90. doi:10.1130/0-8137-2388-4.71. ISBN 978-0-8137-2388-4. Retrieved 25 January 2024.pp=78, 84, 85
- ↑ Boston, Brian; Shillington, Donna J.; Watts, Anthony B.; Cilli, Philip; Dunn, Robert; Ito, Garrett; Wessel, Paul; ten Brink, Uri (June 2025). "Crustal Structure Along and Surrounding the Hawaiian Islands: Volcanic Island Construction Across Scarred Oceanic Crust". Journal of Geophysical Research: Solid Earth. 130 (6): 4. doi:10.1029/2024JB030377.
- ↑ Wessel 1998, p. 405.
- ↑ Hillier, J. K. (February 2007). "Pacific seamount volcanism in space and time". Geophysical Journal International. 168 (2): 877–889. Bibcode:2007GeoJI.168..877H. doi:10.1111/j.1365-246X.2006.03250.x. ISSN 0956-540X.
- ↑ Kelley et al. 2020, pp. 24, 35.
- ↑ Sowers et al. 2020, p. 14.
- 1 2 Kelley et al. 2020, pp. 24, 33.
- ↑ Sowers et al. 2020, p. 15.
Sources
[edit]- Kelley, C.; Parrish, F.; Elliott, K.; Sowers, D.; Maxon, A. (2020). Cruise EX-15-04 Leg 3—2015 Hohonu Moana: Exploring the Deep Waters off Hawaiʻi (ROV/Mapping). NOAA (Report). doi:10.25923/136y-a180. Retrieved 27 January 2024.
- Sowers, Derek; Elliot, Kelley; Kelley, Chris; Parrish, Frank; Nalley, Joy; Raymond, Annie (2020). Mapping Data Acquisition and Processing Summary Report: EX-15-04 Leg 3, Hohonu Moana 2015: Exploring the Deep Waters off Hawai’i (ROV & Mapping) (Report). doi:10.25923/vv2r-qw07.
- Wessel, P. (1 May 1998). "An Empirical Method for Optimal Robust Regional-Residual Separation of Geophysical Data". Mathematical Geology. 30 (4): 391–408. doi:10.1023/A:1021744224009. ISSN 0882-8121. S2CID 118600983.
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