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Mélange within subduction–accretion complex rocks of Fredriksen Island, South Orkney Islands

Published online by Cambridge University Press:  01 May 2009

B. C. Storey  and
A. W. Meneilly
B. C. Storey
Affiliation:
British Antarctic Survey, High Cross Madingley Road Cambridge, CB3 0ET, U.K.
A. W. Meneilly
Affiliation:
British Antarctic Survey, High Cross Madingley Road Cambridge, CB3 0ET, U.K.
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Abstract

Summary. A m´lange on Fredriksen Island, South Orkney Islands, is part of a Mesozoic subduction- accretion complex which formed along the western, Pacific side of Gondwana. It consists of a chaotic arrangement of irregular sized blocks, up to 8 m across, of basic pillow lava, chert, felsite and epiclastic sandstone in a pervasively sheared cataclastic matrix. Inclusions are typically lozenge-shaped and are characteristic of a tectonic m´lange. As the m´lange incorporates both possible ocean floor material that was accreted on to the continental margin and inner slope basin sediments it probably formed beneath the trench-slope basin along a shear zone at a high level in the subduction complex.

Type
Articles
Information
Geological Magazine , Volume 120 , Issue 6 , December 1983 , pp. 555 - 566
Copyright
Copyright © Cambridge University Press 1983

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