scholarly journals Most natural-forming calcites precipitate at isotopic equilibrium

2021 ◽  
Author(s):  
Yuan jie
Keyword(s):  
Oxygen Isotope ◽  
Thermodynamic Equilibrium ◽  
Isotope Fractionation ◽  
Atomic Level ◽  
Quantum Mechanical ◽  
Isotopic Equilibrium ◽  
Oxygen Isotope Fractionation ◽  
Carbon And Oxygen Isotope ◽  
Devils Hole ◽  
Slow Growing

Abstract Based on thermodynamic equilibrium isotope fractionation theory, this letter reasonably understands the clumping 13C-18O (Δ47 ), as well as carbon and oxygen isotope fractionation in calcites with extremely slow-growing rates from Devils Hole and Laghetto Basso (Corchia Cave) at atomic level with solid physical precipitation models and quantum-mechanical backgrounds. It is found that most calcites in nature precipitate in at equilibrium.

Oxygen isotope fractionation between rutile and water and geothermometry of metamorphic eclogites

1979 ◽  
Vol 43 (327) ◽  
pp. 405-413 ◽  
Author(s):  
Alan Matthews ◽  
Robert D. Beckinsale ◽  
John J. Durham
Keyword(s):  
Oxygen Isotope ◽  
Isotope Fractionation ◽  
Western Alps ◽  
Titanium Metal ◽  
Isotopic Equilibrium ◽  
Oxygen Isotope Fractionation ◽  
Tauern Window ◽  
Theoretical Predictions ◽  
Aqueous Oxidation ◽  
Isotope Analyses

SummaryOxygen isotope fractionation between rutile and water has been studied from 300 °C to 700 °C, PH2O = 1 kb, using aqueous oxidation of titanium metal as the equilibration reaction. The mechanism of rutile formation (which is critical to the assessment of isotopic equilibrium) is an ‘armouring’ reaction in which rutile grows around grains of titanium metal by solution-precipitation processes. Mean fractionation factors expressed as 103 In αTiO2-H2O obtained in the present study are:−6.20±0.23‰ at 304±5 °C−6.64±0.27‰ at 405±6 °C−6.11±0.16%. at 508±6 °C−4.45±0.28%. at 608±6 °C−3.38±0.15%. at 698±6 °C.These data agree with those obtained at temperatures above 500 °C by Addy and Garlick (1974) but do not accord with theoretical predictions by Bottinga and Javoy (1973). A minimum in the calibration curve 103 ln α versus 106T−2 occurs between 300 °C and 500 °C but from 500 °C to 700 °C 18O fractionation between rutile and water may be expressed by the equation:103 ln α = −(4.72±0.40)106T−2+(1.62±0.53).Oxygen isotope analyses of rutile and quartz from metamorphic eclogites and schists from the Tauern Window, Austria, yield isotopic temperatures at about 550 °C in agreement with results obtained on similar rocks from the Sesia Zone (Western Alps, Italy) and elsewhere by other workers. Petrologic studies indicate that the latest metamorphism of the Tauern eclogites reached about 450 °C Thus the measured partitions of 18O between rutile and quartz indicating temperatures around 550 °C have been inherited from an earlier metamorphic event.

Stable carbon and oxygen isotope fractionation in bivalve (Placopecten magellanicus) larval aragonite

2008 ◽  
Vol 72 (19) ◽  
pp. 4687-4698 ◽  
Author(s):  
Erin F. Owen ◽  
Alan D. Wanamaker ◽  
Scott C. Feindel ◽  
Bernd R. Schöne ◽  
Paul D. Rawson
Keyword(s):  
Oxygen Isotope ◽  
Isotope Fractionation ◽  
Stable Carbon ◽  
Placopecten Magellanicus ◽  
Oxygen Isotope Fractionation ◽  
Carbon And Oxygen Isotope

Disequilibrium carbon and oxygen isotope fractionation in recent cave calcite: Comparison of cave precipitates and model data

2013 ◽  
Vol 103 ◽  
pp. 232-244 ◽  
Author(s):  
Dana F.C. Riechelmann ◽  
Michael Deininger ◽  
Denis Scholz ◽  
Sylvia Riechelmann ◽  
Andrea Schröder-Ritzrau ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
Isotope Fractionation ◽  
Model Data ◽  
Oxygen Isotope Fractionation ◽  
Carbon And Oxygen Isotope

The Dependence of the Oxygen Isotope Fractionation in the Hydration Water of CuSO4 · 5 H2O on the Crystallization Temperature

1975 ◽  
Vol 30 (12) ◽  
pp. 1667-1674
Author(s):  
D. Götz ◽  
K. Heinzinger ◽  
A. Klemm
Keyword(s):  
Neutron Diffraction ◽  
Oxygen Isotope ◽  
Isotope Fractionation ◽  
Crystallization Process ◽  
Water Molecules ◽  
Hydration Water ◽  
Isotopic Equilibrium ◽  
Oxygen Isotope Fractionation ◽  
X Ray ◽  
Different Types

Abstract The fractionation of the oxygen isotopes in the water collected by stepwise dehydration of CuSO4·5H2O has been measured for the crystallization temperatures 25, 40 and 50 °C. From X-ray and neutron diffraction studies it is known that three different kinds of water, differing in their binding in the crystal, exist in CuSO4 · 5 H2O. On the basis of the results reported here it is concluded that isotopic equilibrium exists between the different kinds of water in the crystal and the mother liquor during the crystallization process. In addition it is shown that on stepwise dehydration the water molecules from the different types of sites can be separated. Consequently, the measurements provide the possibility to determine crystallization temperatures from intracrystalline oxygen isotope fractionation alone. Possible applications in isotope geothermometry are discussed.

Carbon and oxygen isotope fractionation in dense interstellar clouds

1984 ◽  
Vol 277 ◽  
pp. 581 ◽  
Author(s):  
W. D. Langer ◽  
T. E. Graedel ◽  
M. A. Frerking ◽  
P. B. Armentrout
Keyword(s):  
Oxygen Isotope ◽  
Isotope Fractionation ◽  
Oxygen Isotope Fractionation ◽  
Interstellar Clouds ◽  
Carbon And Oxygen Isotope

scholarly journals Carbon and oxygen isotope fractionation in the water-calcite-aragonite system

2018 ◽  
Vol 235 ◽  
pp. 127-139 ◽  
Author(s):  
Jens Fohlmeister ◽  
Jennifer Arps ◽  
Christoph Spötl ◽  
Andrea Schröder-Ritzrau ◽  
Birgit Plessen ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
Isotope Fractionation ◽  
Oxygen Isotope Fractionation ◽  
Carbon And Oxygen Isotope
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