Geology and geochronology of McMurdo volcanic group rocks in the vicinity of Lake Morning, McMurdo Sound, Antarctica
Kyle, P.R.; Muncy, L. (1989). Geology and geochronology of McMurdo volcanic group rocks in the vicinity of Lake Morning, McMurdo Sound, Antarctica. Antarctic Science 1(4): 345-350. http://dx.doi.org/10.1017/S0954102089000520
In: Antarctic Science. Cambridge University Press: Oxford. ISSN 0954-1020; e-ISSN 1365-2079, more
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| Keywords |
Antarctica
Geological time > Phanerozoic > Geological time > Cenozoic > Tertiary > Cenozoic > Neogene > Miocene
Lava flows
PSE, Antarctica, Victoria Land, McMurdo Sound
Rocks > Igneous rocks > Volcanic rocks
Antarctica [Marine Regions]; McMurdo Sound [Marine Regions]
Marine/Coastal |
| Abstract |
Trachyandesite lava flows and trachytic dykes exposed at ‘Gandalf Ridge’ and near Lake Morning on the northern slopes of Mount Morning represent the oldest exposed volcanic rocks in the Erebus volcanic province of the McMurdo Volcanic Group. Conventional whole rock K-Ar age determinations show the rocks are mid-Miocene, ranging between 14.6 and 18.7 Ma. North–south trending faults, which parallel the Transantarctic Mountains, cut the dated dykes. The faults are probably part of a broad fault zone which bounds the uplifted Transantarctic Mountains and the down-dropped Ross Sea/Ross Ice Shelf embayment. |
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