Geochemical and microstructural characterisation of two species of cool-water bivalves (<i>Fulvia tenuicostata</i> and <i>Soletellina biradiata</i>) from Western Australia
The shells of two marine bivalve species (<i>Fulvia tenuicostata</i> and <i>Soletellina biradiata</i>) endemic to south Western Australia have been characterised using a combined crystallographic, spectroscopic and geochemical approach. Both species have been described previo...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2017-03-01
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| Series: | Biogeosciences |
| Online Access: | http://www.biogeosciences.net/14/1721/2017/bg-14-1721-2017.pdf |
| _version_ | 1818694651236843520 |
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| author | L. M. Roger A. D. George J. Shaw R. D. Hart M. Roberts T. Becker B. J. McDonald N. J. Evans |
| author_facet | L. M. Roger A. D. George J. Shaw R. D. Hart M. Roberts T. Becker B. J. McDonald N. J. Evans |
| author_sort | L. M. Roger |
| collection | DOAJ |
| description | The shells of two marine bivalve species (<i>Fulvia tenuicostata</i> and
<i>Soletellina biradiata</i>) endemic to south Western Australia have been
characterised using a combined crystallographic, spectroscopic and
geochemical approach. Both species have been described previously as purely
aragonitic; however, this study identified the presence of three phases,
namely aragonite, calcite and Mg-calcite, using XRD analysis. Data obtained
via confocal Raman spectroscopy, electron probe microanalysis and laser
ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) show
correlations between Mg ∕ S and Mg ∕ P in <i>F. tenuicostata</i>
and between Sr ∕ S and S ∕ Ba in <i>S. biradiata</i>. The
composition of the organic macromolecules that constitute the shell organic
matrix (i.e. the soluble phosphorus-dominated and/or insoluble
sulfur-dominated fraction) influences the incorporation of Mg, Sr and Ba into
the crystal lattice. Ionic substitution, particularly Ca<sup>2+</sup> by Mg<sup>2+</sup>
in calcite in <i>F. tenuicostata</i>, appears to have been promoted by the
combination of both S- and P-dominated organic macromolecules. The elemental
composition of these two marine bivalve shells is species specific and
influenced by many factors, such as crystallographic structure, organic
macromolecule composition and environmental setting. In order to reliably use
bivalve shells as proxies for paleoenvironmental reconstructions, both the
organic and inorganic crystalline material need to be characterised to
account for all influencing factors and accurately describe the <q>vital
effect</q>. |
| first_indexed | 2024-12-17T13:32:58Z |
| format | Article |
| id | doaj.art-8868be628d924dccb4958a5465df6477 |
| institution | Directory Open Access Journal |
| issn | 1726-4170 1726-4189 |
| language | English |
| last_indexed | 2024-12-17T13:32:58Z |
| publishDate | 2017-03-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Biogeosciences |
| spelling | doaj.art-8868be628d924dccb4958a5465df64772022-12-21T21:46:31ZengCopernicus PublicationsBiogeosciences1726-41701726-41892017-03-011461721173710.5194/bg-14-1721-2017Geochemical and microstructural characterisation of two species of cool-water bivalves (<i>Fulvia tenuicostata</i> and <i>Soletellina biradiata</i>) from Western AustraliaL. M. Roger0A. D. George1J. Shaw2R. D. Hart3M. Roberts4T. Becker5B. J. McDonald6N. J. Evans7School of Earth Sciences, the University of Western Australia, Crawley 6009, AustraliaSchool of Earth Sciences, the University of Western Australia, Crawley 6009, AustraliaCentre for Microscopy, Characterisation and Analysis, the University of Western Australia, Crawley 6009, AustraliaCentre for Microscopy, Characterisation and Analysis, the University of Western Australia, Crawley 6009, AustraliaCentre for Microscopy, Characterisation and Analysis, the University of Western Australia, Crawley 6009, AustraliaCentre for Microscopy, Characterisation and Analysis, the University of Western Australia, Crawley 6009, AustraliaDepartment of Applied Geology, John de Laeter Centre, TIGeR, Curtin University, Bentley 6102, AustraliaDepartment of Applied Geology, John de Laeter Centre, TIGeR, Curtin University, Bentley 6102, AustraliaThe shells of two marine bivalve species (<i>Fulvia tenuicostata</i> and <i>Soletellina biradiata</i>) endemic to south Western Australia have been characterised using a combined crystallographic, spectroscopic and geochemical approach. Both species have been described previously as purely aragonitic; however, this study identified the presence of three phases, namely aragonite, calcite and Mg-calcite, using XRD analysis. Data obtained via confocal Raman spectroscopy, electron probe microanalysis and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) show correlations between Mg ∕ S and Mg ∕ P in <i>F. tenuicostata</i> and between Sr ∕ S and S ∕ Ba in <i>S. biradiata</i>. The composition of the organic macromolecules that constitute the shell organic matrix (i.e. the soluble phosphorus-dominated and/or insoluble sulfur-dominated fraction) influences the incorporation of Mg, Sr and Ba into the crystal lattice. Ionic substitution, particularly Ca<sup>2+</sup> by Mg<sup>2+</sup> in calcite in <i>F. tenuicostata</i>, appears to have been promoted by the combination of both S- and P-dominated organic macromolecules. The elemental composition of these two marine bivalve shells is species specific and influenced by many factors, such as crystallographic structure, organic macromolecule composition and environmental setting. In order to reliably use bivalve shells as proxies for paleoenvironmental reconstructions, both the organic and inorganic crystalline material need to be characterised to account for all influencing factors and accurately describe the <q>vital effect</q>.http://www.biogeosciences.net/14/1721/2017/bg-14-1721-2017.pdf |
| spellingShingle | L. M. Roger A. D. George J. Shaw R. D. Hart M. Roberts T. Becker B. J. McDonald N. J. Evans Geochemical and microstructural characterisation of two species of cool-water bivalves (<i>Fulvia tenuicostata</i> and <i>Soletellina biradiata</i>) from Western Australia Biogeosciences |
| title | Geochemical and microstructural characterisation of two species of cool-water bivalves (<i>Fulvia tenuicostata</i> and <i>Soletellina biradiata</i>) from Western Australia |
| title_full | Geochemical and microstructural characterisation of two species of cool-water bivalves (<i>Fulvia tenuicostata</i> and <i>Soletellina biradiata</i>) from Western Australia |
| title_fullStr | Geochemical and microstructural characterisation of two species of cool-water bivalves (<i>Fulvia tenuicostata</i> and <i>Soletellina biradiata</i>) from Western Australia |
| title_full_unstemmed | Geochemical and microstructural characterisation of two species of cool-water bivalves (<i>Fulvia tenuicostata</i> and <i>Soletellina biradiata</i>) from Western Australia |
| title_short | Geochemical and microstructural characterisation of two species of cool-water bivalves (<i>Fulvia tenuicostata</i> and <i>Soletellina biradiata</i>) from Western Australia |
| title_sort | geochemical and microstructural characterisation of two species of cool water bivalves i fulvia tenuicostata i and i soletellina biradiata i from western australia |
| url | http://www.biogeosciences.net/14/1721/2017/bg-14-1721-2017.pdf |
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