scholarly journals Could Coral Skeleton Oxygen Isotopic Fractionation be Controlled by Biology?

2020 ◽  
Author(s):  
Anne Juillet-Leclerc
Keyword(s):  
Isotopic Fractionation ◽  
Coral Skeleton ◽  
Oxygen Isotopic

Hydrogen and Oxygen Isotopic Fractionation During Heterotrophic Cellulose Synthesis

1992 ◽  
Vol 43 (1) ◽  
pp. 47-50 ◽  
Author(s):  
YAO-HUA LUO ◽  
LEONEL DA SILVEIRA LOBO STERNBERG
Keyword(s):  
Isotopic Fractionation ◽  
Cellulose Synthesis ◽  
Oxygen Isotopic

scholarly journals Reviews and syntheses: Revisiting the boron systematics of aragonite and their application to coral calcification

2018 ◽  
Vol 15 (9) ◽  
pp. 2819-2834 ◽  
Author(s):  
Thomas M. DeCarlo ◽  
Michael Holcomb ◽  
Malcolm T. McCulloch
Keyword(s):  
Partition Coefficient ◽  
Isotopic Fractionation ◽  
Computer Code ◽  
Comprehensive Analysis ◽  
Coral Skeleton ◽  
Carbonate Chemistry ◽  
Carbonate System ◽  
Coral Skeletons ◽  
User Friendly ◽  
Propagation Of Uncertainties

Abstract. The isotopic and elemental systematics of boron in aragonitic coral skeletons have recently been developed as a proxy for the carbonate chemistry of the coral extracellular calcifying fluid. With knowledge of the boron isotopic fractionation in seawater and the B∕Ca partition coefficient (KD) between aragonite and seawater, measurements of coral skeleton δ11B and B∕Ca can potentially constrain the full carbonate system. Two sets of abiogenic aragonite precipitation experiments designed to quantify KD have recently made possible the application of this proxy system. However, while different KD formulations have been proposed, there has not yet been a comprehensive analysis that considers both experimental datasets and explores the implications for interpreting coral skeletons. Here, we evaluate four potential KD formulations: three previously presented in the literature and one newly developed. We assess how well each formulation reconstructs the known fluid carbonate chemistry from the abiogenic experiments, and we evaluate the implications for deriving the carbonate chemistry of coral calcifying fluid. Three of the KD formulations performed similarly when applied to abiogenic aragonites precipitated from seawater and to coral skeletons. Critically, we find that some uncertainty remains in understanding the mechanism of boron elemental partitioning between aragonite and seawater, and addressing this question should be a target of additional abiogenic precipitation experiments. Despite this, boron systematics can already be applied to quantify the coral calcifying fluid carbonate system, although uncertainties associated with the proxy system should be carefully considered for each application. Finally, we present a user-friendly computer code that calculates coral calcifying fluid carbonate chemistry, including propagation of uncertainties, given inputs of boron systematics measured in coral skeleton.

Oxygen isotopic fractionation between drip water and speleothem calcite: A 10-year monitoring study, central Texas, USA

2012 ◽  
Vol 304-305 ◽  
pp. 53-67 ◽  
Author(s):  
Weimin Feng ◽  
Jay L. Banner ◽  
Amber L. Guilfoyle ◽  
MaryLynn Musgrove ◽  
Eric W. James
Keyword(s):  
Isotopic Fractionation ◽  
Drip Water ◽  
Monitoring Study ◽  
Central Texas ◽  
Oxygen Isotopic

scholarly journals Effect of increased metabolic rate on oxygen isotopic fractionation

1992 ◽  
Vol 89 (3) ◽  
pp. 319-327 ◽  
Author(s):  
Stefania Zanconato ◽  
Dan M. Cooper ◽  
Yaacov Armon ◽  
Samuel Epstein
Keyword(s):  
Metabolic Rate ◽  
Isotopic Fractionation ◽  
Oxygen Isotopic

scholarly journals Oxygen isotopic fractionation in TiO2 polymorphs (rutile, anatase, brookite) estimated from “first principles”

2019 ◽  
Vol 489 (1) ◽  
pp. 62-64 ◽  
Author(s):  
D. P. Krylov ◽  
A. B. Kuznetsov
Keyword(s):  
Density Functional Theory ◽  
First Principles ◽  
Density Functional ◽  
Isotopic Fractionation ◽  
Functional Theory ◽  
The Density Functional Theory ◽  
Coexisting Phases ◽  
Oxygen Isotopic

Temperature relations of b-factors for 18O/16O substitutions in TiO2 polymorphs have been determined using the density functional theory (DFT): 1000lnbrt(18O/16O) = 6,93039x - 0,08158x2 + 0,00116x3 + 0,08305*P, 1000lnbant(18O/16O) = 7,34275x - 0,09906x2 + 0,00153x3 + 0,08027*P, 1000lnbbrk(18O/16O) = 7,19088x - 009157x2 + 0,00139x3 + 0,07601*P, x = 106/T(K)2, P - pressure (GPa). The relations can be applied for isotope thermometry if combined with -factors of coexisting phases.

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