Library Open Repository
A summary of the oldest ages for the world's islands
Shields, O (1976) A summary of the oldest ages for the world's islands. Papers and Proceedings of the Royal Society of Tasmania, 110. pp. 35-62. ISSN 0080-4703
1976_Shields_Summary.pdf | Download (383kB)
Available under University of Tasmania Standard License.
The oldest ages of rocks on the world's islands are summarized (Oligocene or older) based on published literature. All the oceans and perhaps all the seas contain a few continental islands, indicative of debris left from continental rifting prior to ocean basin formation by seafloor spreading. The Musicians Seamounts and the Hawaiian Ridge (both Cretaceous), and the Tuamotu Islands (Eocene) are the same age as the surrounding seafloor and probably formed at the crest of the East Pacific Rise. Future drilling and dredging operations are expected to modify and add to this list, as recent volcanism may well have obscured the much older basement rocks on many islands. Thus, the faunas of the Galapagos, Mauritius, Rodriguez, and Tristan da Cunha suggest they are continental islands, while their known surface geology yields dates of only 8 m.y. or less.
|Keywords:||Royal Society of Tasmania, RST, Van Diemens Land, natural history, science, ecology, taxonomy, botany, zoology, geology, geography, papers & proceedings, Australia, UTAS Library|
|Journal or Publication Title:||Papers and Proceedings of the Royal Society of Tasmania|
|Page Range:||pp. 35-62|
|Additional Information:||Copyright Royal Society of Tasmania|
|Date Deposited:||28 May 2012 04:14|
|Last Modified:||18 Nov 2014 04:37|
|Item Statistics:||View statistics for this item|
Repository Staff Only (login required)
|Item Control Page|