Bowers Supergroup

The Bowers Terrane consists of volcanic and sedimentary rocks of Cambrian to Ordovician age which together constitute the Bowers Supergroup (Wodzicki and Robert 1986). After 2 decades of fieldwork by geologists from New Zealand, Germany, and the USA,... 

Table 4.3 Stratigraphy of the Bowers Supergroup in the Bowers Terrane of northern Victoria Land (Laird et ai. 1982 Wodzicki and Robert 1986 Stump 1995)...

The rocks of the Bowers Supergroup are structurally deformed but only slightly metamorphosed (preh-nite-pumpellyite or lowermost greenschist facies) and their ages are indicated by fossils such as acritarchs, trace fossils, as well as trilobites, brachiopods, and mollusks (Laird et al. 1972, 1974 Dow and Neall 1974 Shergold et al. 1976 Andrews and Laird 1976 Cooper et al. 1976,1982). 

The rocks of the Bowers Supergroup are locally overlain by erosional remnants of the Beacon Supergroup (Permian to Triassic) which includes sills of the Ferrar Dolerite (Middle Jurassic). In addition, erosional remnants of the Kirkpatrick Basalt plateau (Middle Jurassic) are present adjacent to the Lanterman Range and in the Leitch Massif (Gair et al. 1969). 

Adams CJD, Gabites JE, Wodzicki A, Laird MG, Bradshaw JD (1982) Potassium-argon geochronometry of the Precambrian-Cambrian Wilson and Robertson Bay groups and Bowers Supergroup, northern Victoria Land, Antarctica. In Craddock... 

Cooper RA, Jago JB, Rowell AJ, Braddock P (1983) Age rmd correlation of the Cambriem-Ordovician Bowers Supergroup, northern Victoria Land. In Oliver RL, James PR, Jago (eds) Antarctic earth science. Australian Academy of Science, Canberra, ACT, pp 128-131... 

Gibson GM (1987) Metamorphism and deformation in the Bowers Supergroup Implications for terrane accretion in northern Victoria Land, Antarctica. In Leitch EC, Schreibner E (eds) Terrane accretion and orogenic belts. Geophysical Monograph, vol. 41. American Geophysical Union, Washington, DC, pp 207-219... 

Weaver SD, Bradshaw JD, Laird MG (1984) Geochemistry of Cambrian volcanics of the Bowers Supergroup and implications for the early Paleozoic tectonic evolution of northern Victoria Land, Antarctica. Earth Planet Sci Lett 68 128-140... 

The apparent duration of the remagnetization event and the high precision of the mean direction from the Bowers Supergroup are most consistent with locking in of the remanence during the Cretaceous normal polarity superchron. 

Schmierer K, Burmester R (1986) Paleomagnetic results from the Cambro-Ordovician Bowers Supergroup, northern Victoria Land, Antarctica In Stump E (ed) Geological investigations on Northern Victoria Land. Antarctic Research Series, vol. 46. American Geophysical Union, Washington, DC, pp 69-90... 

Beacon Supergroup Admiralty Intmsives in the Robertson Bay and Bowers terranes Gallipoli Porphyries... 

Fig. 4.19 The Bowers Terrane occupies the central area of northern Victoria Land flanked by the Wilson Terrane in the west and the Robertson Bay Terrane in the east The major rock types of this segment of the Transantarctic Mountains are identified by capital letters in alphabetical order A = Admiralty Intmsives, B = Beacon Supergroup, BT = Bowers Terrane, G = Granite Harbor Intrusives, P = Galhpoli Porphyries, R = Robertson Bay Group, W = Wilson Group. The Kirkpatrick Basalt has been onritted from this map for the sake of clarity and the Ferrar Dolerite sills are included with the Beacon Supergroup. The Lanterman and Salamander ranges constitute the eastern province of the Wilson Terrane (Adapted from Gair et al. 1969)...

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