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159 Ma Kjakebeinet lamproites (Dronning Maud Land, Antarctic) and their implications for Gondwana breakup processes

A. V. Luttinen, X. Zhang and K. A. Foland
159 Ma Kjakebeinet lamproites (Dronning Maud Land, Antarctic) and their implications for Gondwana breakup processes
Geological Magazine (September 2002) 139 (5): 525-539

Abstract

Lamproite dykes that cross-cut Middle Jurassic Karoo-related flood basalts in Vestjella, Dronning Maud Land, Antarctica, have been dated at 158.7+1.6 Ma by (super 40) Ar/ (super 39) Ar incremental heating of phlogopite. The Kjakebeinet lamproites are notably high in incompatible elements, show negative initial epsilon (sub Sr) values (+14, +17) with T (sub DM) model ages of c. 1.1 Ga, and probably record melting of metasomatized and subcontinental lithospheric mantle beneath western Dronning Maud Land. Their emplacement records the youngest recognized magmatic event in the region, coincides with the proposed second and final stage of Gondwana breakup between Africa and Antarctica, and may be associated with deep-seated coast-parallel strike-slip faulting in Dronning Maud Land. (modified journ. abstr.)


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 139
Serial Issue: 5
Title: 159 Ma Kjakebeinet lamproites (Dronning Maud Land, Antarctic) and their implications for Gondwana breakup processes
Affiliation: British Antarctic Survey, Cambridge, United Kingdom
Pages: 525-539
Published: 200209
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 75
Accession Number: 2003-025963
Categories: Igneous and metamorphic petrologySolid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch map
Secondary Affiliation: Ohio State University, USA, United States
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200309
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