The age, petrogenesis and emplacement of the Dalmatian Granite, H.U. Sverdrupfjella, Dronning Maud Land, Antarctica

The ∼470 Ma Dalmatian Granite forms sheet-like bodies intruded discordantly into orthogneisses, paragneisses and calcareous rocks belonging to the ∼1000 Ma Jutulrora, Sveabreen and Fuglefjellet formations respectively. The Dalmatian Granite is muscovite + biotite bearing. Two varieties are recognize...

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Bibliographic Details
Published in:Antarctic Science
Main Authors: Grantham, G.H., Moyes, A.B., Hunter, D.R.
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 1991
Subjects:
Geology
Ecology, Evolution, Behavior and Systematics
Oceanography
Dronning Maud Land
Transantarctic Mountains
Sverdrupfjella
Fuglefjellet
Sveabreen
Jutulrora
Antarc*
Antarctic Science
Antarctica
Online Access:http://dx.doi.org/10.1017/s0954102091000238
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102091000238
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Summary:The ∼470 Ma Dalmatian Granite forms sheet-like bodies intruded discordantly into orthogneisses, paragneisses and calcareous rocks belonging to the ∼1000 Ma Jutulrora, Sveabreen and Fuglefjellet formations respectively. The Dalmatian Granite is muscovite + biotite bearing. Two varieties are recognized, one that is magnetite-bearing and another that is characterized by tourmaline nodules. At some localities, development of the tourmaline-bearing variety is spatially associated with the presence of carbonates. Physical conditions of emplacement for the Dalmatian Granite are estimated to be approximately 700°C and 6kbar with pH 2 O = P load . The emplacement of the granite is considered to have occurred syntectonically during D 3 approximately 470 Ma ago. The granites are therefore similar in age to Pan African age granites in Mozambique as well as Ross Orogeny age granites in the Transantarctic Mountains.

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