Isotope data from Cretaceous chalks and foraminifera; environmental or diagenetic signals?

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doi: 10.1130/0091-7613(1997)025<0691:IDFCCA>2.3.CO;2
Authors:Mitchell, Simon F.; Ball, James D.; Crowley, Stephen F.; Marshall, Jim D.; Paul, Christopher R. C.; Veltkamp, Cornelis J.; Samir, Ashraf M.
Author Affiliations:Primary:
University of the West Indies, Department of Geography and Geology, Kingston, Jamaica
University of Liverpool, Liverpool, United Kingdom
University of Alexandria, Alexandria, Egypt
Volume Title:Geology (Boulder)
Source:Geology (Boulder), 25(8), p.691-694. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613
Publication Date:1997
Note:In English. 17 refs.; illus., incl. 1 table
Summary:Scanning electron microscopy of sediments, microfossils, and polished thin sections from the Cenomanian-Turonian boundary section at Dover, England, demonstrates that cement is concentrated within large pores such as foraminifera and calcispheres, whereas the surrounding coccolith-rich sediments are largely lacking in cement. Isotope analysis of single microfossils and cement samples indicates the presence of mixing lines between primary (paleoceanographic) compositions and cements. Consequently, paleoceanographic and stratigraphic interpretations of these sediments, and perhaps other similar sediments based on similar data, may be suspect.
Subjects:Arthropoda; Benthic taxa; C-13/C-12; Carbon; Carbonate rocks; Cement; Cenomanian; Chalk; Clastic rocks; Covariance analysis; Cretaceous; Crustacea; Cyclic processes; Foraminifera; Isotope ratios; Isotopes; Mandibulata; Marl; Mesozoic; Microfossils; O-18/O-16; Ostracoda; Oxygen; Paleo-oceanography; Paleoenvironment; Sedimentary rocks; SEM data; Stable isotopes; Statistical analysis; Turonian; Upper Cretaceous; England; Europe; Great Britain; Kent England; London Basin; United Kingdom; Western Europe; Dover England; Invertebrata; Plenus Marl Formation; Protista
Coordinates:N510000 N511500 E0013000 E0010000
Abstract Numbers:98M/2046
Record ID:1997067716
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
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