The mineralogy and chemistry of modern shallow-water and deep-sea corals
Thesis: Ph. D., Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2019 Cataloged from PDF version of thesis. Includes bibliographical ref...
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ftmit:oai:dspace.mit.edu:1721.1/122323 2023-06-11T04:15:42+02:00 The mineralogy and chemistry of modern shallow-water and deep-sea corals Farfan, Gabriela A.(Gabriela Aylin) Colleen M. Hansel. Joint Program in Oceanography/Applied Ocean Science and Engineering. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences. Woods Hole Oceanographic Institution. Joint Program in Oceanography/Applied Ocean Science and Engineering Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Woods Hole Oceanographic Institution 2019 214 pages application/pdf https://hdl.handle.net/1721.1/122323 eng eng Massachusetts Institute of Technology https://hdl.handle.net/1721.1/122323 1102054498 MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission. http://dspace.mit.edu/handle/1721.1/7582 Joint Program in Oceanography/Applied Ocean Science and Engineering Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution Corals Deep sea corals Mineralogy CoralsEcology CoralsComposition CoralsAnatomy CoralsGrowth Thesis 2019 ftmit 2023-05-29T08:33:35Z Thesis: Ph. D., Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2019 Cataloged from PDF version of thesis. Includes bibliographical references. The architecture of coral reef ecosystems is composed of coral skeletons built from the mineral aragonite (CaCO3). Coral reefs are currently being threatened by ocean acidification (OA), which may lower calcification rates, reduce skeletal density, and increase aragonite dissolution. Crystallography and chemistry are what govern the materials properties of minerals, such solubility and strength. Thus, understanding the mineralogical nature of coral aragonite and how it forms are important for predicting bulk skeletal responses under climate change. Different models based on geochemical versus biological controls over coral skeleton biomineralization propose conflicting predictions about the fate of corals under OA. Rather than investigating the mechanism directly, I use a mineralogical approach to study the aragonite end-products of coral biomineralization. I hypothesize that coral mineralogy and crystallography will lend insights into how coral aragonite crystals form and how sensitive coral aragonite material properties may be to OA. Here I compare the crystallography, bonding environments, and compositions of coral aragonite with aragonite produced by other organisms (mollusk), synthetically (abiogenic precipitation in aragonite-supersaturated seawater and freshwater), and in natural geological settings (abiogenic). Coral aragonite crystallography does not resemble mollusk aragonite (aragonite formed with a strong biological influence), but rather is identical to abiogenic synthetic aragonite precipitated from seawater. I predict that the material properties of coral aragonite are similar to that of abiogenic synthetic seawater aragonites and that coral aragonite formation is sensitive to ... Thesis Ocean acidification DSpace@MIT (Massachusetts Institute of Technology) |
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language |
English |
topic |
Joint Program in Oceanography/Applied Ocean Science and Engineering Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution Corals Deep sea corals Mineralogy CoralsEcology CoralsComposition CoralsAnatomy CoralsGrowth |
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Joint Program in Oceanography/Applied Ocean Science and Engineering Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution Corals Deep sea corals Mineralogy CoralsEcology CoralsComposition CoralsAnatomy CoralsGrowth Farfan, Gabriela A.(Gabriela Aylin) The mineralogy and chemistry of modern shallow-water and deep-sea corals |
topic_facet |
Joint Program in Oceanography/Applied Ocean Science and Engineering Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution Corals Deep sea corals Mineralogy CoralsEcology CoralsComposition CoralsAnatomy CoralsGrowth |
description |
Thesis: Ph. D., Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2019 Cataloged from PDF version of thesis. Includes bibliographical references. The architecture of coral reef ecosystems is composed of coral skeletons built from the mineral aragonite (CaCO3). Coral reefs are currently being threatened by ocean acidification (OA), which may lower calcification rates, reduce skeletal density, and increase aragonite dissolution. Crystallography and chemistry are what govern the materials properties of minerals, such solubility and strength. Thus, understanding the mineralogical nature of coral aragonite and how it forms are important for predicting bulk skeletal responses under climate change. Different models based on geochemical versus biological controls over coral skeleton biomineralization propose conflicting predictions about the fate of corals under OA. Rather than investigating the mechanism directly, I use a mineralogical approach to study the aragonite end-products of coral biomineralization. I hypothesize that coral mineralogy and crystallography will lend insights into how coral aragonite crystals form and how sensitive coral aragonite material properties may be to OA. Here I compare the crystallography, bonding environments, and compositions of coral aragonite with aragonite produced by other organisms (mollusk), synthetically (abiogenic precipitation in aragonite-supersaturated seawater and freshwater), and in natural geological settings (abiogenic). Coral aragonite crystallography does not resemble mollusk aragonite (aragonite formed with a strong biological influence), but rather is identical to abiogenic synthetic aragonite precipitated from seawater. I predict that the material properties of coral aragonite are similar to that of abiogenic synthetic seawater aragonites and that coral aragonite formation is sensitive to ... |
author2 |
Colleen M. Hansel. Joint Program in Oceanography/Applied Ocean Science and Engineering. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences. Woods Hole Oceanographic Institution. Joint Program in Oceanography/Applied Ocean Science and Engineering Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Woods Hole Oceanographic Institution |
format |
Thesis |
author |
Farfan, Gabriela A.(Gabriela Aylin) |
author_facet |
Farfan, Gabriela A.(Gabriela Aylin) |
author_sort |
Farfan, Gabriela A.(Gabriela Aylin) |
title |
The mineralogy and chemistry of modern shallow-water and deep-sea corals |
title_short |
The mineralogy and chemistry of modern shallow-water and deep-sea corals |
title_full |
The mineralogy and chemistry of modern shallow-water and deep-sea corals |
title_fullStr |
The mineralogy and chemistry of modern shallow-water and deep-sea corals |
title_full_unstemmed |
The mineralogy and chemistry of modern shallow-water and deep-sea corals |
title_sort |
mineralogy and chemistry of modern shallow-water and deep-sea corals |
publisher |
Massachusetts Institute of Technology |
publishDate |
2019 |
url |
https://hdl.handle.net/1721.1/122323 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
https://hdl.handle.net/1721.1/122323 1102054498 |
op_rights |
MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission. http://dspace.mit.edu/handle/1721.1/7582 |
_version_ |
1768372720392732672 |