Can the pattern of foraminiferal intratest trace element variations be explained by Ca dilution during biomineralization?
Recently Hathorne et al. (2009) documented large intratest trace element (TE) variations in planktonic foraminifera from a single sediment trap sample that could not be explained by variations in water column properties. The laser ablation ICP-MS depth profiles of trace elements through the test wal...
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ftoceanrep:oai:oceanrep.geomar.de:10910 2023-05-15T18:01:10+02:00 Can the pattern of foraminiferal intratest trace element variations be explained by Ca dilution during biomineralization? Hathorne, Ed C. 2010 text https://oceanrep.geomar.de/id/eprint/10910/ https://oceanrep.geomar.de/id/eprint/10910/1/2010_Hathorne_EGU2010-5184.pdf http://meetingorganizer.copernicus.org/EGU2010/EGU2010-5184.pdf en eng Copernicus https://oceanrep.geomar.de/id/eprint/10910/1/2010_Hathorne_EGU2010-5184.pdf Hathorne, E. C. (2010) Can the pattern of foraminiferal intratest trace element variations be explained by Ca dilution during biomineralization?. [Talk] In: EGU General Assembly 2010. , 02.05.-07.05.2010, Vienna, Austria . Geophysical Research Abstracts. EGU2010-5184 . Conference or Workshop Item NonPeerReviewed 2010 ftoceanrep 2023-04-07T14:59:17Z Recently Hathorne et al. (2009) documented large intratest trace element (TE) variations in planktonic foraminifera from a single sediment trap sample that could not be explained by variations in water column properties. The laser ablation ICP-MS depth profiles of trace elements through the test walls revealed strong positive correlations between Li, Mg, Mn and Ba resulting from the mixing of a lower TE outer calcite with a higher TE inner calcite. In contrast Sr/Ca ratios remained relatively constant throughout the test wall. These intratest TE variations likely result from biomineralization processes and therefore should be explained by any valid biomineralization model. However, changes in calcite precipitation rate, crystal structure, or the chemical composition of the internal calcification reservoir could not, by themselves, fully account for the pattern of cation intratest variability. Here I expand on this work and investigate if a model of coral biomineralization by Sinclair and Risk (2006) can be adapted to explain the pattern of intratest TE variability in foraminifera. It is clear that the low Mg calcite secreting foraminifera must reduce the Mg/Ca ratio of the calcifying solution by at least a factor of 10 (e.g. Hathorne et al., 2009) and it has been suggested this is achieved by active removal of Mg from the calcification reservoir, although the actual mechanisms remain debatable (e.g. Bentov and Erez, 2006). However, a recent study of the calcification of a low Mg calcite species in the laboratory found a large shortcoming in the amount of Ca potentially provided by seawater transported to the site of calcification in vacuoles compared to a conservative estimate of the amount required to form the new calcite wall (de Nooijer et al., 2009a). This suggests active Ca transport to the site of calcification is required to provide sufficient Ca. If Ca specific, this Ca addition would effectively dilute the TE content (including Mg) of the calcification reservoir to varying degrees and potentially cause ... Conference Object Planktonic foraminifera OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Sinclair ENVELOPE(-63.883,-63.883,-65.733,-65.733) |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Recently Hathorne et al. (2009) documented large intratest trace element (TE) variations in planktonic foraminifera from a single sediment trap sample that could not be explained by variations in water column properties. The laser ablation ICP-MS depth profiles of trace elements through the test walls revealed strong positive correlations between Li, Mg, Mn and Ba resulting from the mixing of a lower TE outer calcite with a higher TE inner calcite. In contrast Sr/Ca ratios remained relatively constant throughout the test wall. These intratest TE variations likely result from biomineralization processes and therefore should be explained by any valid biomineralization model. However, changes in calcite precipitation rate, crystal structure, or the chemical composition of the internal calcification reservoir could not, by themselves, fully account for the pattern of cation intratest variability. Here I expand on this work and investigate if a model of coral biomineralization by Sinclair and Risk (2006) can be adapted to explain the pattern of intratest TE variability in foraminifera. It is clear that the low Mg calcite secreting foraminifera must reduce the Mg/Ca ratio of the calcifying solution by at least a factor of 10 (e.g. Hathorne et al., 2009) and it has been suggested this is achieved by active removal of Mg from the calcification reservoir, although the actual mechanisms remain debatable (e.g. Bentov and Erez, 2006). However, a recent study of the calcification of a low Mg calcite species in the laboratory found a large shortcoming in the amount of Ca potentially provided by seawater transported to the site of calcification in vacuoles compared to a conservative estimate of the amount required to form the new calcite wall (de Nooijer et al., 2009a). This suggests active Ca transport to the site of calcification is required to provide sufficient Ca. If Ca specific, this Ca addition would effectively dilute the TE content (including Mg) of the calcification reservoir to varying degrees and potentially cause ... |
format |
Conference Object |
author |
Hathorne, Ed C. |
spellingShingle |
Hathorne, Ed C. Can the pattern of foraminiferal intratest trace element variations be explained by Ca dilution during biomineralization? |
author_facet |
Hathorne, Ed C. |
author_sort |
Hathorne, Ed C. |
title |
Can the pattern of foraminiferal intratest trace element variations be explained by Ca dilution during biomineralization? |
title_short |
Can the pattern of foraminiferal intratest trace element variations be explained by Ca dilution during biomineralization? |
title_full |
Can the pattern of foraminiferal intratest trace element variations be explained by Ca dilution during biomineralization? |
title_fullStr |
Can the pattern of foraminiferal intratest trace element variations be explained by Ca dilution during biomineralization? |
title_full_unstemmed |
Can the pattern of foraminiferal intratest trace element variations be explained by Ca dilution during biomineralization? |
title_sort |
can the pattern of foraminiferal intratest trace element variations be explained by ca dilution during biomineralization? |
publisher |
Copernicus |
publishDate |
2010 |
url |
https://oceanrep.geomar.de/id/eprint/10910/ https://oceanrep.geomar.de/id/eprint/10910/1/2010_Hathorne_EGU2010-5184.pdf http://meetingorganizer.copernicus.org/EGU2010/EGU2010-5184.pdf |
long_lat |
ENVELOPE(-63.883,-63.883,-65.733,-65.733) |
geographic |
Sinclair |
geographic_facet |
Sinclair |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
https://oceanrep.geomar.de/id/eprint/10910/1/2010_Hathorne_EGU2010-5184.pdf Hathorne, E. C. (2010) Can the pattern of foraminiferal intratest trace element variations be explained by Ca dilution during biomineralization?. [Talk] In: EGU General Assembly 2010. , 02.05.-07.05.2010, Vienna, Austria . Geophysical Research Abstracts. EGU2010-5184 . |
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1766170517589458944 |