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High-resolution analysis of trace elements in crustose coralline algae from the North Atlantic and North Pacific by laser ablation ICP-MS

Artikel i vetenskaplig tidskrift
Författare S. Hetzinger
J. Halfar
Thomas Zack
G. Gamboa
D. E. Jacob
B. E. Kunz
A. Kronz
W. Adey
P. A. Lebednik
R. S. Steneck
Publicerad i Palaeogeography Palaeoclimatology Palaeoecology
Volym 302
Nummer/häfte 1-2
Sidor 81-94
ISSN 0031-0182
Publiceringsår 2011
Publicerad vid Institutionen för geovetenskaper
Sidor 81-94
Språk en
Ämnesord coralline algae, clathromorphum, laser ablation, la-icp-ms, trace element, electron microprobe, north pacific, north atlantic, proxy archive, sea-surface temperature, great-barrier-reef, arctica-islandica, sr/ca records, red algae, magnesium, reconstructions, geochemistry, thermometry, variability
Ämneskategorier Geovetenskap och miljövetenskap, Geokemi, Geologi, Kvartärgeologi, Klimatforskning

Sammanfattning

We have investigated the trace elemental composition in the skeleta of two specimens of attached-living coralline algae of the species Clathromorphum compactum from the North Atlantic (Newfoundland) and Clathromorphum nereostratum from the North Pacific/Bering Sea region (Amchitka Island, Aleutians). Samples were analyzed using Laser Ablation-Inductively Coupled Plasma Mass Spectrometry (IA-ICP-MS) yielding for the first time continuous individual trace elemental records of up to 69 years in length. The resulting algal Mg/Ca, Sr/Ca, U/Ca, and Ba/Ca ratios are reproducible within individual sample specimens. Algal Mg/Ca ratios were additionally validated by electron microprobe analyses (Amchitka sample). Algal Sr/Ca, U/Ca, and Ba/Ca ratios were compared to algal Mg/Ca ratios, which previously have been shown to reliably record sea surface temperature (SST). Ratios of Sr/Ca from both Clathromorphum species show a strong positive correlation to temperature-dependent Mg/Ca ratios, implying that seawater temperature plays an important role in the incorporation of Sr into algal calcite. Linear Sr/Ca-SST regressions have provided positive, but weaker relationships as compared to Mg/Ca-SST relationships. Both, algal Mg/Ca and Sr/Ca display clear seasonal cycles. Inverse correlations were found between algal Mg/Ca and U/Ca, Ba/Ca, and correlations to SST are weaker than between Mg/Ca, Sr/Ca and SST. This suggests that the incorporation of U and Ba is influenced by other factors aside from temperature. (C) 2010 Elsevier B.V. All rights reserved.

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