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Carbon-isotope composition of Lower Cretaceous fossil wood: Ocean-atmosphere chemistry and relation to sea-level change

Gröcke, D.R.; Hesselbo, S.P.; Jenkyns, H.C.

Authors

S.P. Hesselbo

H.C. Jenkyns



Abstract

The carbon-isotope composition of fossil wood fragments, collected through a biostratigraphically well-constrained Aptian (Lower Cretaceous) shallow-marine siliciclastic succession on the Isle of Wight, southern Britain, shows distinct variations with time. The results indicate that the stratigraphic signature of δ13Cwood through the Aptian was influenced primarily by fluctuations in the isotopic composition of CO2 in the global ocean-atmosphere system, as registered in marine carbonates elsewhere, and was not governed by local paleoenvironmental and/or paleoecological factors. Negative and positive excursions in δ13Cwood through the lower Aptian occur in phase with inferred transgressions and regressions, respectively—a pattern that contrasts with that observed in many previous studies for different time intervals. The relationship between δ13C variations and relative sea-level change is tentatively interpreted as a response to various climatic and eustatic factors, relating to rapid sea-floor spreading, thermal uplift of ocean floor, emplacement of plateaus, volcanic CO2 emissions, weathering, and sedimentary rate.

Citation

Gröcke, D., Hesselbo, S., & Jenkyns, H. (1999). Carbon-isotope composition of Lower Cretaceous fossil wood: Ocean-atmosphere chemistry and relation to sea-level change. Geology, 27(2), 155-158. https://doi.org/10.1130/0091-7613%281999%29027%3C0155%3Acicolc%3E2.3.co%3B2

Journal Article Type Article
Publication Date 1999-02
Deposit Date May 19, 2015
Journal Geology
Print ISSN 0091-7613
Electronic ISSN 1943-2682
Publisher Geological Society of America
Peer Reviewed Peer Reviewed
Volume 27
Issue 2
Pages 155-158
DOI https://doi.org/10.1130/0091-7613%281999%29027%3C0155%3Acicolc%3E2.3.co%3B2