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| Dissolution susceptibility of Paleocene-Eocene planktic foraminifera: implications for palaeoceanographic reconstructions Nguyen, T.M.P.; Petrizzo, M.R.; Stassen, P.; Speijer, R.P. (2011). Dissolution susceptibility of Paleocene-Eocene planktic foraminifera: implications for palaeoceanographic reconstructions. Mar. Micropaleontol. 81(1-2): 1-21. http://dx.doi.org/10.1016/j.marmicro.2011.07.001
In: Marine Micropaleontology. Elsevier: Amsterdam; New York; Oxford; Tokyo. ISSN 0377-8398; e-ISSN 1872-6186
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Two independent experiments were carried out, one focusing on gradual qualitative deterioration of taxa by dissolution and the other documenting the weight loss of taxa. Shell parameters such as wall thickness, porosity and pore size were determined through Scanning Electron Microscopy (SEM) and image analysis (JMicroVision). We found that the large muricate Acarinina and Morozovella are most resistant, followed by the cancellate Subbotina and the small muricate Igorina, confirming results of previous work. At species level, the thick-walled Acarinina soldadoensis, Acarinina subsphaerica and the large Morozovella subbotinae are the most resistant species. Most of the large Morozovella species such as Morozovella aequa, Morozovella formosa-gracilis, Morozovella velascoensis and Morozovella pasionensis, together with Acarinina nitida show intermediate dissolution resistance, whereas the small muricate Igorina species, the cancellate Subbotina velascoensis and the thin-walled Morozovella acuta and Morozovella occlusa are the most vulnerable species. We propose a formula for calculating the dissolution resistance of taxa based on their wall thickness and size — two key parameters in dissolution resistance of a species. Application of this formula reveals good agreement between the calculated and measured dissolution resistance, indicating its robustness. Furthermore, the agreement between our experimental results, in-situ experimental results on live foraminifera and natural quantitative/qualitative records suggests that our experiments accurately mimic natural dissolution processes. Consequently, these experimental results strongly bear on interpretations of foraminiferal dissolution in natural environments, especially in studies on early Paleogene climatic events that are often associated with dissolution phenomena. More generally, a proper assessment of taphonomic alteration by dissolution should be part of every paleoenvironmental reconstruction based on quantitative foraminiferal records. |
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