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Raman Analysis of Octocoral Carbonate Ion Lattice Disorder along a Natural Depth Gradient, Kona Coast, Hawai'i.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Raman Analysis of Octocoral Carbonate Ion Lattice Disorder along a Natural Depth Gradient, Kona Coast, Hawai'i./
Author:	Conner, Kyle Anthony.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2022,
Description:	88 p.
Notes:	Source: Masters Abstracts International, Volume: 84-01.
Contained By:	Masters Abstracts International84-01.
Subject:	Chemical oceanography. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29061769
ISBN:	9798834058304

Raman Analysis of Octocoral Carbonate Ion Lattice Disorder along a Natural Depth Gradient, Kona Coast, Hawai'i.
Conner, Kyle Anthony.

Raman Analysis of Octocoral Carbonate Ion Lattice Disorder along a Natural Depth Gradient, Kona Coast, Hawai'i. - Ann Arbor : ProQuest Dissertations & Theses, 2022 - 88 p.

Source: Masters Abstracts International, Volume: 84-01.

Thesis (M.S.)--University of Hawai'i at Manoa, 2022.

This item must not be sold to any third party vendors.

Both environmental and vital effects cause carbonate lattice disorder in biogenic Mg-calcites. A major component of this disorder is driven by the incorporation of Mg through environmental forcing and growth rate kinetics although non-Mg factors (e.g., other cation/anion impurities, organic molecules) also contribute. Understanding the drivers of Mg content in biogenic calcite and its effects on disorder has implications for octocoral Mg paleo-proxies and the stability and diagenetic alteration of their calcitic skeletons. However, prior studies of biogenic Mg-calcites have often been complicated by sampling inconsistencies over space and time and potential intra-sample Mg variability. This study aims to analyze the relative contributing factors of octocoral Mg-calcite lattice disorder along gradients of both depth and growth rate. Calcitic octocorals (Corallidae and Isididae, N = 28) were collected from 221-823 m across a natural gradient in biogeochemical parameters (pH: 7.4-7.9, T: 5-16°C) off the Kona coast of Hawai'i Island and analyzed using Raman spectroscopy. Samples were collected during the same month, controlling for potential seasonal variability. Raman spectral parameters from the ν1 peak quantified total carbonate lattice disorder (full width at half maximum height [FWHM] of ν1) and Mg content (ν1 position, Raman shift). The total lattice disorder was then partitioned into Mg-driven and non-Mg driven components (residual FWHM). The total lattice disorder and Mg content decreased significantly with increasing depth, correlating with temperature and carbonate system parameters. The Mg-temperature relationships from this study were also consistent with prior studies. Residual FWHM did not correlate to any environmental parameters. When measured across an intra-sample gradient of (ontogenetic) growth rate, total lattice disorder, Mg content, and residual FWHM increased with growth rate for all but one taxon, demonstrating the kinetic effect of growth rate as well as potential taxon specific vital effects. These results provide insight into how environmental and growth rate kinetic effects independently affect different components of carbonate lattice disorder (Mg content and non-Mg factors). These findings also suggest that Raman spectroscopy may be helpful in quantifying solubility within biogenic calcites.

ISBN: 9798834058304Subjects--Topical Terms:

516760
Chemical oceanography.
Subjects--Index Terms:

Carbonate ion disorder

Raman Analysis of Octocoral Carbonate Ion Lattice Disorder along a Natural Depth Gradient, Kona Coast, Hawai'i.
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245 1 0 $a Raman Analysis of Octocoral Carbonate Ion Lattice Disorder along a Natural Depth Gradient, Kona Coast, Hawai'i.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2022
300 $a 88 p.
500 $a Source: Masters Abstracts International, Volume: 84-01.
500 $a Advisor: Kahng, Samuel;Sabine, Christopher.
502 $a Thesis (M.S.)--University of Hawai'i at Manoa, 2022.
506 $a This item must not be sold to any third party vendors.
520 $a Both environmental and vital effects cause carbonate lattice disorder in biogenic Mg-calcites. A major component of this disorder is driven by the incorporation of Mg through environmental forcing and growth rate kinetics although non-Mg factors (e.g., other cation/anion impurities, organic molecules) also contribute. Understanding the drivers of Mg content in biogenic calcite and its effects on disorder has implications for octocoral Mg paleo-proxies and the stability and diagenetic alteration of their calcitic skeletons. However, prior studies of biogenic Mg-calcites have often been complicated by sampling inconsistencies over space and time and potential intra-sample Mg variability. This study aims to analyze the relative contributing factors of octocoral Mg-calcite lattice disorder along gradients of both depth and growth rate. Calcitic octocorals (Corallidae and Isididae, N = 28) were collected from 221-823 m across a natural gradient in biogeochemical parameters (pH: 7.4-7.9, T: 5-16°C) off the Kona coast of Hawai'i Island and analyzed using Raman spectroscopy. Samples were collected during the same month, controlling for potential seasonal variability. Raman spectral parameters from the ν1 peak quantified total carbonate lattice disorder (full width at half maximum height [FWHM] of ν1) and Mg content (ν1 position, Raman shift). The total lattice disorder was then partitioned into Mg-driven and non-Mg driven components (residual FWHM). The total lattice disorder and Mg content decreased significantly with increasing depth, correlating with temperature and carbonate system parameters. The Mg-temperature relationships from this study were also consistent with prior studies. Residual FWHM did not correlate to any environmental parameters. When measured across an intra-sample gradient of (ontogenetic) growth rate, total lattice disorder, Mg content, and residual FWHM increased with growth rate for all but one taxon, demonstrating the kinetic effect of growth rate as well as potential taxon specific vital effects. These results provide insight into how environmental and growth rate kinetic effects independently affect different components of carbonate lattice disorder (Mg content and non-Mg factors). These findings also suggest that Raman spectroscopy may be helpful in quantifying solubility within biogenic calcites.
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650 4 $a Mineralogy. $3 516743
650 4 $a Geochemistry. $3 539092
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653 $a Octocorals
653 $a Raman spectroscopy
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710 2 $a University of Hawai'i at Manoa. $b Oceanography. $3 3282820
773 0 $t Masters Abstracts International $g 84-01.
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792 $a 2022
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29061769