Syn-depositional deformation in a Cretaceous succession, James Ross Island, Antarctica. Evidence from vitrinite reflectivity

Abstract A detailed vitrinite reflectivity study has been made through the Cretaceous sedimentary rocks of northwest James Ross Island, Antarctica. The results show that a progressive increase in reflectivity does not occur with depth and that values (0.45 %) from the base of the succession are lowe...

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Bibliographic Details
Published in:Geological Magazine
Main Authors: Whitham, A. G., Marshall, J. E. A.
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 1988
Subjects:
Online Access:http://dx.doi.org/10.1017/s0016756800023402
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756800023402
Description
Summary:Abstract A detailed vitrinite reflectivity study has been made through the Cretaceous sedimentary rocks of northwest James Ross Island, Antarctica. The results show that a progressive increase in reflectivity does not occur with depth and that values (0.45 %) from the base of the succession are lower than expected for the sequence as described by previous authors. Using a synthesis of sedimentological and stratigraphic information, the sequence is reinterpreted as an apparent monoclinal syncline, strongly influenced by syndepositional tectonics, with a thickness appreciably less than previously described.