Bollons Seamount: Difference between revisions
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{{short description|Continental fragment seamount southeast of New Zealand}} |
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'''''this page needs more info'''''''''Bold text''''''Bold text'''''' 'Bollons Seamount''' is a [[seamount]] ([[Submarine volcano|underwater volcano]]) just east of the [[international date line]], a few hundred miles off the coast of [[New Zealand]].<ref name="earthref">{{cite web|title=Bollons Seamount|work=Seamount database|publisher=Earthref, a [[National Science Foundation]] project|accessdate=22 July 2010}}</ref> |
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[[File:Zealandia, topographic map.jpg|thumb|upright=1.35|Topographic map of [[Zealandia]], showing Bollons Seamount in the southeast]] |
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<ref>{{cite web|title=Google Maps|url=http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=49%C2%BA+57.60'+S,+176%C2%BA+42.00'+W&sll=37.0625,-95.677068&sspn=23.126202,56.162109&ie=UTF8&ll=-49.95122,-176.660156&spn=37.692136,112.324219&z=3|publisher=[[Google]]|accessdate=22 July 2010}}</ref> |
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'''Bollons Seamount''' or '''Bollons Tablemount''' is a [[seamount]] just east of the [[international date line]], a few hundred miles off the coast of [[New Zealand]].<ref>{{cite web |title=Google Maps |url=https://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=49%C2%BA+57.60'+S,+176%C2%BA+42.00'+W&sll=37.0625,-95.677068&sspn=23.126202,56.162109&ie=UTF8&ll=-49.95122,-176.660156&spn=37.692136,112.324219&z=3 |accessdate=22 July 2010}}</ref> It represents a [[continental fragment]] that separated from [[Zealandia (continent)|Zealandia]] as a result of [[rift]]ing.<ref name="Sutherland1999">{{cite journal | bibcode=1999Tectp.308..341S | title=Basement geology and tectonic development of the greater New Zealand region: an interpretation from regional magnetic data | author=Sutherland, Rupert | journal=Tectonophysics | year=1999 | volume=308 | issue=3 | pages=341–362 | doi=10.1016/S0040-1951(99)00108-0}}</ref> |
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The seamount was involved in a 2002 survey and collection project defined to find the edge of New Zealand's [[continental shelf]].<ref>{{cite web |year=2002 |title=Hydrographic Report Number crunching time for Continental Shelf Project |url=http://www.hydrographicsociety.org.nz/reports/report_conti.htm |accessdate=22 July 2010|archive-url=https://web.archive.org/web/20100526030218/http://www.hydrographicsociety.org.nz/reports/report_conti.htm|archive-date=26 May 2010}}</ref> The Bollons Seamount has been shown to be a site of extensive [[Cretaceous]]-era [[plate tectonics|rifting]] in the area towards the southern [[Chatham Rise]] between 83.7 and 78.5 [[mya (unit)|MYA]].<ref name="Davy2006">{{cite journal |last=Davy |first=B. |year=2006 |title=Bollons Seamount and early New Zealand–Antarctic seafloor spreading |journal=Geochem. Geophys. Geosyst. |doi=10.1029/2005GC001191 |volume=7 |issue=6 |page=Q06021 |bibcode=2006GGG.....7.6021D |doi-access=free }}</ref> |
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[[File:Zealandia topography and magnetism.jpg|thumb|left|alt=Bollons Seamount Magnetic Anomaly|White outline of [[Zealandia]] with '''Bollons Seamount''' [[magnetic anomaly]] identifiable to the south of the [[Campbell Plateau]]. Magnetic anomaly is shown as red (field deviation more than 100nT) and blue (field deviation less than -100nT). Outside the confines of Zealandia on the oceanic plates, the effects of sea flow spreading are seen to the south in terms of parallel magnetic anomaly which is disrupted by the Bollons Seamount continental fragment]] |
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[[Magnetic anomaly|Magnetic anomalies]] from the seamount indicate that it was the site of highly irregular activity, with differences in the rifting there being up to {{convert|100|km|mi|0|abbr=on}}. A {{convert|50|km|mi|0|abbr=on}} gap near the seamount, known as the Ballons gap, is interpreted as being due to excess volcanism from the [[seafloor spreading]] process. A ridge just south of the seamount, the [[Antipodes Fracture Zone]], is interpreted as having been built by a combination of compression and volcanic activity associated with the [[Triple junction|triple-junction]] [[Bellingshausen Plate|Bellingshausen]]-Marie Byrd Land [[plate tectonics|plate boundary]] nearby.<ref name="Davy2006"/> |
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==References== |
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{{reflist}} |
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==External links== |
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*[https://earthref.org/cgi-bin/sc-s2-list.cgi?database_name=sc&search_start=advanced&selected_smnt_id=585 Bollons Seamount] at the Seamount database published by Earthref, a [[National Science Foundation]] project |
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[[Category:New Zealand seafloor (oceanography)]] |
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[[Category:Zealandia (continent)]] |
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[[ja:ボロンズ海山]] |
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[[Category:Geography of the New Zealand seabed]] |
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[[Category:Continental fragments]] |
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[[Category:Seamounts of New Zealand]] |
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Revision as of 18:40, 2 November 2022
Bollons Seamount or Bollons Tablemount is a seamount just east of the international date line, a few hundred miles off the coast of New Zealand.[1] It represents a continental fragment that separated from Zealandia as a result of rifting.[2] The seamount was involved in a 2002 survey and collection project defined to find the edge of New Zealand's continental shelf.[3] The Bollons Seamount has been shown to be a site of extensive Cretaceous-era rifting in the area towards the southern Chatham Rise between 83.7 and 78.5 MYA.[4]
Magnetic anomalies from the seamount indicate that it was the site of highly irregular activity, with differences in the rifting there being up to 100 km (62 mi). A 50 km (31 mi) gap near the seamount, known as the Ballons gap, is interpreted as being due to excess volcanism from the seafloor spreading process. A ridge just south of the seamount, the Antipodes Fracture Zone, is interpreted as having been built by a combination of compression and volcanic activity associated with the triple-junction Bellingshausen-Marie Byrd Land plate boundary nearby.[4]
References
- ^ "Google Maps". Retrieved 22 July 2010.
- ^ Sutherland, Rupert (1999). "Basement geology and tectonic development of the greater New Zealand region: an interpretation from regional magnetic data". Tectonophysics. 308 (3): 341–362. Bibcode:1999Tectp.308..341S. doi:10.1016/S0040-1951(99)00108-0.
- ^ "Hydrographic Report Number crunching time for Continental Shelf Project". 2002. Archived from the original on 26 May 2010. Retrieved 22 July 2010.
- ^ a b Davy, B. (2006). "Bollons Seamount and early New Zealand–Antarctic seafloor spreading". Geochem. Geophys. Geosyst. 7 (6): Q06021. Bibcode:2006GGG.....7.6021D. doi:10.1029/2005GC001191.
External links
- Bollons Seamount at the Seamount database published by Earthref, a National Science Foundation project