|Appears in Collections:||Biological and Environmental Sciences Journal Articles|
|Peer Review Status:||Refereed|
|Title:||Identification and composition of secondary meniscus calcite in fossil coral and the effect on predicted sea surface temperature|
Dobson, Phil S
Fallick, Anthony E
Tudhope, Alexander W
|Citation:||Dalbeck P, Cusack M, Dobson PS, Allison N, Fallick AE & Tudhope AW (2011) Identification and composition of secondary meniscus calcite in fossil coral and the effect on predicted sea surface temperature, Chemical Geology, 280 (3-4), pp. 314-322.|
|Abstract:||This study uses electron backscatter diffraction (EBSD) and atomic force microscopy (AFM) to identify secondary calcite in coral skeletons. Secondary calcite appears to have nucleated on the original aragonite dissepiments, producing horizontal structures that mimic the morphology of the original coral aragonite, forming dissepiment-like meniscus structures. The Sr/Ca and δ18O of the pristine aragonite and secondary calcite were analysed by secondary ion mass spectrometry (SIMS). The effect of calcite inclusion on the mean geochemistry of the coral carbonate and subsequent sea surface temperature (SST) calculations were determined for both Sr/Ca and δ18O. Inclusion of as little as 1% secondary calcite within the primary coral aragonite elevates the Sr/Ca-derived SST by 1.2°C and could markedly offset estimates of past tropical climate. Conversely, inclusion of 10% secondary calcite has little effect on the SST estimated from δ18O (+0.6°C) indicating that this proxy is relatively robust to even large amounts of calcite. The different extents to which the two proxies would be influenced by inadvertent inclusion of such meniscus calcite demonstrate the importance of a multi-proxy approach. © 2010 Elsevier B.V.|
|Rights:||The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.|
|Notes:||Additional listed co-author: EIMF - Edinburgh Ion Microprobe Facility|
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