Stable carbon and oxygen isotope record of Cretaceous planktonic foraminifera from DSDP (Table 1)
Citation
Nederbragt A J, Erlich R N, Fouke B W, Ganssen G M (1997). Stable carbon and oxygen isotope record of Cretaceous planktonic foraminifera from DSDP (Table 1). PANGAEA - Publishing Network for Geoscientific and Environmental Data. Occurrence dataset https://doi.org/10.1594/pangaea.704919 accessed via GBIF.org on 2018-08-16.Description
The Cretaceous Heterohelix moremani (Cushman) was the only biserial planktonic foraminiferal species from its first appearance in the late Albian up to the Cenomanian/Turonian boundary. Within that time, it increased gradually in abundance relative to other planktonic foraminifera in five Circum-North Atlantic sections. It is generally rare in upper Albian sediments, common in most of the Cenomanian and very abundant in sediments representing the latest Cenomanian Oceanic Anoxic Event. Short-term variations on the overall abundance trend correlate with positive excursions in the bulk carbonate delta13C record. Maximum rain rates of H. moremani during OAE2 show that this species was an opportunist that did well in extreme conditions, but its overall distribution indicates that it is not necessarily a marker for very high palaeoproductivity environments. Stable oxygen and carbon isotope measurements on foraminiferal species indicate that H. moremani was a surface water dweller at least in part of its geographic range, but incorporated 13C out of equilibrium with ambient seawater. It is depleted in delta13C relative to other planktonic foraminifera, which is attributed to vital effects related to its opportunistic character.Taxonomic Coverages
Geographic Coverages
Bibliographic Citations
Contacts
Alexandra J Nederbragtoriginator
Robert N Erlich
originator
Bruce W Fouke
originator
Gerald M Ganssen
originator
metadata author
PANGAEA - Data Publisher for Earth & Environmental Science
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homepage: https://www.pangaea.de
administrative point of contact
PANGAEA - Data Publisher for Earth & Environmental Science
email: info@pangaea.de
homepage: http://www.pangaea.de