New Zealand Journal of Geology and Geophysics abstracts
Amalgamation of disparate crustal fragments in the Walcott Bay-Foster Glacier
area, South Victoria Land, Antarctica
Y. A. COOK
D. CRAW
Geology Department
University of Otago
P.O. Box 56
Dunedin, New Zealand
Abstract Five structurally distinct crustal sub-blocks are
recognised in the Walcott Bay-Foster Glacier area of South Victoria Land. The
Radian sub-block consists of variably deformed greenschist and amphibolite
facies metasediments, some of which have original clastic textures preserved.
The Rücker sub-block is made up almost entirely of amphibolite facies
marble folded into a broad synform on the 10 km scale. The Glee sub-block is
made up of three parallel belts of metasediments with northeast strike. The
Renegar sub-block consists of metasediments deformed around kilometre-scale
plutons. The Kemp sub-block is composite, including exotic quartzofeldspathic
metasediments and orthogneiss extensively altered by metamorphic muscovite. The
five sub-blocks have been amalgamated into the Walcott crustal block along
amphibolite facies ductile shear zones which had dominantly strike-slip motion.
The Walcott Block has a northeast-striking structural grain, and has been
intruded by Middle Cambrian alkaline intrusions. The numerous structural
discontinuities identified in the Walcott Bay-Foster Glacier area preclude
mapping of lithostratigraphy and metamorphic isograds.
Keywords Antarctica; structure; ductile faults; metamorphism;
tectonics; South Victoria Land; Ross Orogeny
New Zealand Journal of Geology & Geophysics, 2001, Vol 44: 403-416
0028-8306/01/4403-0403 $7.00/0 (c) The Royal Society of New Zealand
2001
PDF file of entire paper: medium quality (2401K); (scanned from paper original: notes about this process)
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