Tasmantid Seamount Chain
Like its neighbour, the Tasmantid Seamount Chain has resulted from the Indo-Australian Plate moving northward over a stationary hotspot. It ranges in age from about 56 to 7 million years old.
Features
The Tasmantid Seamount Chain includes the following named seamounts:
There is an unnamed seamount between Stradbroke Seamount and Derwent Hunter Guyot and 7 unnamed seamounts in the Coral Sea near Mellish Reef that have been assigned to the chain. Some of the later have age ranges between 37.0 to 50.5 Ma. Also assigned to the chain are two sampled areas of the southern Louisiade Plateau with ages of 56.40 ± 0.60 and 55.00 ± 0.40 Ma respectively that are believed to represent the most northern aspects of the chain.
Geology
The volcanics are saturated tholeiitic to transitional alkali-olivine basalt.
Age note
- ^ Only limited sampling and age studies have been done. Ages are available on some of the eleven dredging samples analysed by Eggins et al.(1991) by K/Ar absolute methodology and some of 32 later samples by the ArAr relative methodology. While different specimens from Gascoyne Seamount matched on age, different specimens from Britannia Guyots mismatch by 5 million years odd by the two different methodologies. However adjacant volcanoes can have long eruptive histories. ArAr age subsample data as presented in conference proceedings in 2015 is sourced from the appendix published by Douglas(2022).
References
- ^ Douglas (Smethurst), Amelia (2022). The East Australian, Tasmantid and Lord Howe volcanoes : exploring the origins of three, contemporaneous, parallel chains of volcanism. (PhD thesis and appendix) (Thesis). doi:10.7488/era/2805. Retrieved 2023-03-30.
- ^ "Marine Gazetteer Placedetails". Retrieved 2017-02-20.
- ^ "Tasmantid Seamounts of Australia". Archived from the original on 2017-02-18. Retrieved 2017-02-20.
- ^ Richards, F. D.; Kalnins, L. M.; Watts, A. B.; Cohen, B. E.; Beaman, R. J. (October 2018). "The Morphology of the Tasmantid Seamounts: Interactions Between Tectonic Inheritance and Magmatic Evolution" (PDF). Geochemistry, Geophysics, Geosystems. 19 (10): 3870–3891. Bibcode:2018GGG....19.3870R. doi:10.1029/2018GC007821. hdl:20.500.11820/10f58983-8003-4af7-8fdd-def2ed23b0be. S2CID 133360937.
- ^ Richards, F. D.; Kalnins, L. M.; Watts, A. B.; Cohen, B. E.; Beaman, R. J. (2018). "The Morphology of the Tasmantid Seamounts: Interactions Between Tectonic Inheritance and Magmatic Evolution". Geochemistry, Geophysics, Geosystems. 19 (10): 3870–3891. Bibcode:2018GGG....19.3870R. doi:10.1029/2018GC007821. hdl:10044/1/74307.
- ^ Van Der Linden, Willem J. M. (1970). "Morphology of the Tasman sea floor". New Zealand Journal of Geology and Geophysics. 13: 282–291. Bibcode:1970NZJGG..13..282V. doi:10.1080/00288306.1970.10428218.
- ^ W. J. Morgan and J. P. Morgan. Plate velocities in hotspot reference frame: electronic supplement.
- ^ "GEBCO Undersea Feature Names Gazetteer".
- ^ Eggins, S. M.; Green, David Headley; Falloon, Trevor J. (1991). "The Tasmantid seamounts: Shallow melting and contamination of an EM1 mantle plume". Earth and Planetary Science Letters. 107 (3–4): 448–462. Bibcode:1991E&PSL.107..448E. doi:10.1016/0012-821X(91)90092-V.
- ^ "Coral Sea Marine Park - Management Plan 2018" (PDF). Retrieved 2023-03-29.