Please Note:

The Open Access Repository will be moving to a new authentication system on the 1st of November.

From this date onwards, account holders will be required to login using their University of Tasmania credentials.
If your current repository username differs from your University username, please email so we can update these details on your behalf.

Due to the change, there will be a short outage of the repository from 9am on the morning of the 1st of November

Open Access Repository

Origin, structural and tectonic history of the Macquarie Island region


Downloads per month over past year

Williamson, PE (1988) Origin, structural and tectonic history of the Macquarie Island region. Papers and Proceedings of the Royal Society of Tasmania, 122 (1). pp. 27-43. ISSN 0080-4703

1988_Williamson...pdf | Download (626kB)
Available under University of Tasmania Standard License.


Macquarie Island, in the Southern Ocean, was formed by oceanic crust uplift due to transpressivc forces
between the Indian / Australian and Pacific oceanic plates, in a transpressional regime which has persisted over the last
10 Ma. The amount of uplift is affected by regional isostatic compensation for crustal thickening; accompanying effects
are tilting of rocks and rotation of the southern segment of the island. Gabbro and serpentinite, in the north, and basalts,
in the south, all of which were formed in the primary oceanic crust, are now exposed. Consequently, magnetic properties
of igneous rocks on the island correlate with similar features on the Indian plate which is on both sides of it.
In conflict with evidence from younger palaeontological and potassium-argon (K-Ar) dating, which may reflect later
episodes, this suggests that the original oceanic crust composing the island was formed at the I ndian-Antarctic accreting
mid-oceanic ridge around the time of anomaly 7 (27 Ma BY.).

Item Type: Article
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. 27-43
ISSN: 0080-4703
Collections: Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
Additional Information:

Copyright Royal Society of Tasmania

Date Deposited: 24 May 2012 01:32
Last Modified: 15 Sep 2017 01:06
Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page