d17O_c: Triple oxygen isotope values of carbonates

In isogeochem: Tools for Stable Isotope Geochemistry

Triple oxygen isotope values of carbonates

Description

d17O_c() calculates the equilibrium d18O, d17O, and D17O values of a calcite grown at a given temperature.

Usage

d17O_c(
  temp,
  d18O_H2O_VSMOW,
  D17O_H2O = 0,
  min = "calcite",
  eq17 = "Wostbrock20",
  eq18 = "Daeron19",
  lambda = 0.528
)

Arguments

temp	Calcite growth temperature (°C).
d18O_H2O_VSMOW	Water d18O value expressed on the VSMOW scale (‰).
D17O_H2O	D17O value of ambient water calculated using a lambda of 0.528. Default 0.
min	Mineralogy. Options are "calcite" (default) and "aragonite".
eq17	Equation used to calculate the 17O/16O fractionation factor between carbonate and water. Options are "Wostbrock20" (default) and "GZ19".
eq18	Equation used to calculate the 18O/16O fractionation factor between carbonate and water. Options are like in a18_c_H2O(). Default "Daeron19".
lambda	Triple oxygen isotope reference slope. Default 0.528.

Details

\theta_{A/B} = \frac{\alpha^{17}_{A/B}}{\alpha^{18}_{A/B}}

\delta'^{17}O_{H2O,VSMOW} = \beta \times \delta'^{18}O_{H2O,VSMOW} + \gamma \textrm{ , where } \beta=0.528 \textrm{ and } \gamma = 0

\Delta^{17}O_{CaCO3,VSMOW} = \delta'^{17}O_{CaCO3,VSMOW} - \lambda \times \delta'^{18}O_{CaCO3,VSMOW}

"Wostbrock20": Wostbrock et al. (2020):

\theta_{aragonite/water} = \frac{-1.53}{T} + 0.5305

\theta_{calcite/water} = \frac{-1.39}{T} + 0.5305

"GZ19": Guo and Zhou (2019):

\theta_{aragonite/water} = \frac{78.1173}{T^{2}} - \frac{1.5152}{T} + 0.5299

\theta_{calcite/water} = \frac{59.1047}{T^{2}} - \frac{1.4089}{T} + 0.5297

Value

Returns a data frame:

1. d18O value of the carbonate expressed on the VSMOW scale (‰).

2. d17O value of the carbonate expressed on the VSMOW scale (‰).

3. D17O value of the carbonate expressed on the VSMOW scale (‰).

References

Wostbrock, J.A.G., Brand, U., Coplen, T.B., Swart, P.K., Carlson, S.J., Brearley, A.J., and Sharp, Z.D. (2020). Calibration of carbonate-water triple oxygen isotope fractionation: Seeing through diagenesis in ancient carbonates. Geochimica et Cosmochimica Acta, 288, 369-388. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1016/j.gca.2020.07.045")}

Guo, W., and Zhou, C. (2019). Triple oxygen isotope fractionation in the DIC-H2O-CO2 system: A numerical framework and its implications. Geochimica et Cosmochimica Acta, 246, 541-564. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1016/j.gca.2018.11.018")}

See Also

Other equilibrium_carbonate: D47(), D48(), d18O_c()

Examples

d17O_c(temp = 10, d18O_H2O_VSMOW = -1) # Returns the data frame (length = 3)
prime(d17O_c(temp = 10, d18O_H2O_VSMOW = -1)[, 2]) # Returns the d'17O value
d17O_c(temp = 10, d18O_H2O_VSMOW = -1)[, 3] # Returns the D17O value

isogeochem documentation built on March 31, 2023, 8:30 p.m.