Mesozoic dolerites from Whichaway Nunataks

The southernmost exposures of Mesozoic dolerites in Coats Land, the Omega dolerites, occur at Whichaway Nunataks. The dolerites are geochemically indistinguishable from the Theron Mountains' dolerites. In both regions high- and low-Ti compositions occur with trace element signatures more akin t...

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Bibliographic Details
Published in:Antarctic Science
Main Author: Brewer, T.S.
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 1989
Subjects:
Geology
Ecology, Evolution, Behavior and Systematics
Oceanography
Coats Land
Theron Mountains
Weddell
Weddell Sea
Whichaway Nunataks
Antarctic Science
Online Access:http://dx.doi.org/10.1017/s0954102089000222
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102089000222
Description
Summary:The southernmost exposures of Mesozoic dolerites in Coats Land, the Omega dolerites, occur at Whichaway Nunataks. The dolerites are geochemically indistinguishable from the Theron Mountains' dolerites. In both regions high- and low-Ti compositions occur with trace element signatures more akin to island-arc magmas than within-plate tholeiites. From a preliminary Sr isotopic study the Omega dolerites can be classified as Ferrar type. The existence of Ferrar type material in these nunataks suggest that the boundary between the Ferrar and Weddell Sea sub-provinces occurs within the Theron Mountains.

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