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

Darren R. Groecke, Stephen P. Hesselbo and Hugh C. Jenkyns
Carbon-isotope composition of Lower Cretaceous fossil wood; ocean-atmosphere chemistry and relation to sea-level change
Geology (Boulder) (February 1999) 27 (2): 155-158

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 delta (super 13) C (sub wood) through the Aptian was influenced primarily by fluctuations in the isotopic composition of CO (sub 2) 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 delta (super 13) C (sub wood) 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 delta (super 13) C 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 CO (sub 2) emissions, weathering, and sedimentary rate.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 27
Serial Issue: 2
Title: Carbon-isotope composition of Lower Cretaceous fossil wood; ocean-atmosphere chemistry and relation to sea-level change
Affiliation: University of Oxford, Department of Earth Sciences, Oxford, United Kingdom
Pages: 155-158
Published: 199902
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 44
Accession Number: 1999-021266
Categories: StratigraphyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: charts
N50°40'00" - N50°45'00", W01°30'00" - W01°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199908
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