The Open UniversitySkip to content
 

Determination of intratest variability of trace elements in foraminifera by laser ablation inductively coupled plasma-mass spectrometry

Hathorne, E. C.; Alard, O.; James, R. H. and Rogers, N. W. (2003). Determination of intratest variability of trace elements in foraminifera by laser ablation inductively coupled plasma-mass spectrometry. Geochemistry Geophysics Geosystems, 4(12) pp. 1–14.

URL: http://www.agu.org/pubs/crossref/2003/2003GC000539...
DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1029/2003GC000539
Google Scholar: Look up in Google Scholar

Abstract

We have developed a technique to determine the variability of trace elements (including Li, B, Na, Mg, Mn, Cu, Zn, Sr and Ba) within foraminifera tests using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). This technique has a high spatial resolution (width 40–80 mm, depth >0.5 mm), is reproducible (<8% external reproducibility) and has low detection limits (generally <0.05 mg g1). We demonstrate that normalization of data to a calcite standard usually gives results that are more consistent with solution ICP-MS data than normalization to NIST 612. Rastering into the wall of the final chamber of
Globigerinoides sacculifer shows that the outermost 1.5 mm of the test is enriched in trace elements, including Mn, relative to the interior, indicating the presence of a contaminant surface phase. Pustule calcite close to the aperture of Globorotalia tumida has different Sr/Ca and Ba/Ca compared to other parts of the test. Sr/Ca and Ba/Ca partition coefficients suggest that the pustule calcite is diagenetic and/or formed in a more open system. Multiple analyses of Orbulina universa tests recovered from a latitudinal transect in the North Atlantic give a relationship between Mg/Ca and sea surface temperature similar to that reported elsewhere in the literature. These initial data demonstrate the validity of this technique, and show that it is potentially an extremely powerful microanalytical tool for palaeoceanographic and palaeontological studies.

Item Type: Journal Article
ISSN: 1525-2027
Keywords: Foraminifera; laser ablation ICP-MS; trace element/Ca ratios; calcite.
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 10490
Depositing User: Rachael James
Date Deposited: 31 Mar 2008
Last Modified: 02 Dec 2010 20:07
URI: http://oro.open.ac.uk/id/eprint/10490
Share this page:

Altmetrics

Scopus Citations

Actions (login may be required)

View Item
Report issue / request change

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340   general-enquiries@open.ac.uk