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Journal of the Geological Society; 2005; v. 162; issue.4; p. 641-651;
DOI: 10.1144/0016-764904-096
© 2005 Geological Society of London

Original Article

Investigating the record of Permian climate change from argillaceous sedimentary rocks, Oman

M.H. Stephenson1, M.J. Leng2, C.H. Vane1, P.L. Osterloff3 & C. Arrowsmith2

1 1British Geological Survey, Keyworth, Nottingham NG12 5GG, UK (e-mail: m.stephenson@bgs.ac.uk)
2 2NERC Isotope Geoscience Laboratory, British Geological Survey, Keyworth, Nottingham NG12 5GG, UK
3 3EPT–SGS, Sarawak Shell Berhad, Locked Bag No. 1, 98009 Miri, Sarawak, Malaysia

A standard method for the analysis of carbon isotope composition of bulk organic matter ({delta}13Cbulk) in palaeoenvironmental and stratigraphic studies of sedimentary basins associated with hydrocarbons is suggested. This method includes the removal of interstitial hydrocarbon within the sediments, which is shown to have a negative effect on {delta}13C. Using the method, a {delta}13Cbulk trend (c. –21 to –24{per thousand}) was found within the Lower Permian Al Khlata and lower Gharif formations of Thuleilat-16 and -42 well sections, south Oman. Palaeontological and sedimentological evidence indicates considerable palaeoenvironmental change, from a cold climate lowland fern flora and upland primitive conifer flora low in the sequence, to a lowland cycad-like and upland glossopterid or other gymnospermous flora higher in the sequence. The lithologies range from glacial diamictite at the base to calcrete horizons and redbeds at the top. It is therefore likely that the {delta}13Cbulk trend is related to palaeoenvironmental change.

Key Words: Permian • 13C • climate change • palynology




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M.H. STEPHENSON, D. MILLWARD, M.J. LENG, and C.H. VANE
Palaeoecological and possible evolutionary effects of early Namurian (Serpukhovian, Carboniferous) glacioeustatic cyclicity
Journal of the Geological Society, 2008; 165: 993 - 1005.
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