Melt-modified lithosphere beneath Ross Island and its role in the tectono-magmatic evolution of the West Antarctic Rift System

Mantle lithosphere influences rift system tectonic evolution, yet the age and composition of rifted lithosphere is typically difficult to constrain due to limited sampling. In the West Antarctic Rift System (WARS), Cenozoic to recent alkaline volcanic rocks yield a variety of peridotite and pyroxeni...

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Bibliographic Details
Published in:Chemical geology 2019-07, Vol.518, p.45-54
Main Authors: Day, James M.D., Harvey, Ralph P., Hilton, David R.
Format: Article
Language:English
Subjects:
Helium
Highly siderophile elements
Mantle lithosphere
Melt-rock reaction
Mesozoic
Ross Island
West Antarctic Rift System
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Summary:Mantle lithosphere influences rift system tectonic evolution, yet the age and composition of rifted lithosphere is typically difficult to constrain due to limited sampling. In the West Antarctic Rift System (WARS), Cenozoic to recent alkaline volcanic rocks yield a variety of peridotite and pyroxenite xenoliths that allow sampling of lithosphere. We report osmium and helium isotope data, elemental abundances, and petrology, for a suite of xenoliths and lavas from the Hut Point Peninsula of Ross Island. Recently (
ISSN:0009-2541
1872-6836
DOI:10.1016/j.chemgeo.2019.04.012