| 词条 | Osbourn Seamount |
| 释义 |
| name=Osbourn Seamount | pushpin_map= Pacific Ocean | map_caption= | depth= | height= | location= South Pacific Ocean | group= | coordinates = {{Coord|26|S|175|W|display=title, inline}} | country = | type=Guyot | volcanic_group=Louisville Ridge | age=76.7±0.8 {{Abbr|Ma|million year}} | last_eruption= | discovered= | Discovered_by= | First_visit= | translation= | pronunciation= | photo= | photo_caption= }} The Osbourn Seamount is a seamount in the south-west Pacific Ocean. It is the western-most and oldest unsubducted seamount of the Louisville Ridge, with an estimated age of 78.8 ± 1.3 {{Abbr|Ma|million year}}.[1][2] Like other seamounts comprising the Louisville Ridge, it was formed by the Louisville hotspot which is currently located {{Convert|4300|km|abbr=on}} away near the Pacific-Antarctic Ridge.[3] Osbourn Seamount will eventually be destroyed by subduction in the Tonga and Kermadec trenches once it is carried into the trenches by the ongoing plate motion.[4] The trench-chain collision zone is moving southward at a rate of {{Convert|200|km|abbr=on}}/{{Abbr|Ma|million year}} because of the oblique angle between the trench and the Louisville chain. This further shortens the seamount's lifespan.[5] The flat top of the seamount is currently tilting down toward the trench because the seamount is sitting on the edge of the trench where the Australian Plate is being bent by subduction.[6] A bathymetric high {{Circa}} {{Convert|2|km|abbr=on}} north-west of the Osbourn Seamount has been interpreted as the currently subducting portion of the Louisville chain, but this continuation is not aligned with the existent chain. The Osbourn Seamount is the same age as the Detroit Seamount (75.8±0.6 Ma), one of the oldest of the Hawaii–Emperor seamount chain, and a clockwise bend in the Louisville chain near Osbourn is similar to the Detroit-Meiji bend in the Hawaii–Emperor chain.[7] References
1. ^{{Harvnb|Timm|Bassett|Graham|Leybourne|2013|loc=Location of the Louisville seamount chain beneath the arc, pp. 5–6}} 2. ^{{Cite journal|last=Koppers|first=Anthony A. P.|last2=Gowen|first2=Molly D.|last3=Colwell|first3=Lauren E.|last4=Gee|first4=Jeffrey S.|last5=Lonsdale|first5=Peter F.|last6=Mahoney|first6=John J.|last7=Duncan|first7=Robert A.|date=December 2011|title=New 40Ar/39Ar age progression for the Louisville hot spot trail and implications for inter-hot spot motion|journal=Geochemistry, Geophysics, Geosystems|language=en|volume=12|issue=12|pages=n/a|doi=10.1029/2011gc003804|issn=1525-2027|bibcode=2011GGG....12.AM02K}} 3. ^{{Harvnb|Hawkins|Lonsdale|Batiza|1987|loc=Abstract}} 4. ^{{Cite news|url=https://www.bbc.co.uk/news/science-environment-16056192|title=Subsea mountains' 'march to ruin'|last=Shukman|first=David|date=2011-12-06|work=BBC News|access-date=2018-06-15|language=en-GB}} 5. ^{{Harvnb|Garcia-Castellanos|Torne|Fernandez|2000|loc=14:38}} 6. ^{{Harvnb|Garcia-Castellanos|Torne|Fernandez|2000|loc=4:12}} 7. ^{{Harvnb|Timm|Bassett|Graham|Leybourne|2013|loc=Location of the Louisville seamount chain beneath the arc, pp. 5–6}}
| last1 = Garcia-Castellanos | first1 = D. | last2 = Torne | first2 = M. | last3 = Fernandez | first3 = M. | title = Slab pull effects from a flexural analysis of the Tonga and Kermadec Trenches (Pacific Plate) | year = 2000 | journal = Geophysical Journal International | volume = 141 | issue = 2 | pages = 479–484 | url = http://diapiro.ictja.csic.es/gt/danielgc/papers/Garcia-Castellanos%20et%20al.,%202000,%20GJI.pdf | access-date = 9 April 2017 | doi = 10.1046/j.1365-246x.2000.00096.x | bibcode = 2000GeoJI.141..479G }}
| last1 = Hawkins | first1 = J. W. | last2 = Lonsdale | first2 = P. F. | last3 = Batiza | first3 = R. | chapter = Petrologic Evolution of the Louisville Seamount Chain | pages = 235–254 | title = Seamounts, islands, and atolls | editor1-last = Keating | editor1-first = B. H. | editor2-last = Fryer | editor2-first = P. | editor3-last = Batiza | editor3-first = R. | editor4-last = Boehlert | editor4-first = G. W. | year = 1987 | publisher = American Geophysical Union | location = Washington, D. C. | doi = 10.1029/GM043p0235 | ref = harv| bibcode = 1987GMS....43..235H| series = Geophysical Monograph Series | isbn = 9781118664209
| last1 = Timm | first1 = C. | last2 = Bassett | first2 = D. | last3 = Graham | first3 = I. J. | last4 = Leybourne | first4 = M. I. | last5 = De Ronde | first5 = C. E. | last6 = Woodhead | first6 = J. | last7 = Layton-Matthews | first7 = D. | last8 = Watts | first8 = A. B. | title = Louisville seamount subduction and its implication on mantle flow beneath the central Tonga–Kermadec arc | year = 2013 | journal = Nature Communications | volume = 4 | page = 1720 | url = http://igppweb.ucsd.edu/~dbassett/Publications_files/Timm_Louisville_seamount_subduction_NatureComm_2013.pdf | access-date = 19 March 2017 | doi = 10.1038/ncomms2702 | pmid = 23591887 | ref = harv| bibcode = 2013NatCo...4E1720T}}{{Refend}}{{marine-geo-stub}} 5 : Guyots|Seamounts of the Pacific Ocean|Hotspot volcanoes|Cretaceous volcanoes|Polygenetic volcanoes |
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