d17O_qz: Triple oxygen isotope values of quartz

In isogeochem: Tools for Stable Isotope Geochemistry

Triple oxygen isotope values of quartz

Description

d17O_qz() calculates the equilibrium d18O, d17O, and D17O values of quartz grown at a given temperature.

Usage

d17O_qz(temp, d18O_H2O_VSMOW, D17O_H2O = 0, lambda = 0.528)

Arguments

temp	Quartz 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.
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_{SiO2,VSMOW} = \delta'^{17}O_{SiO2,VSMOW} - \lambda \times \delta'^{18}O_{SiO2,VSMOW}

NOTE:

\theta_{quartz/water} = -\frac{1.85}{T} + 0.5305

\alpha^{18}_{quartz/water} = e^{(\frac{4280}{T^{2}} - \frac{3.5}{T})}

Value

Returns a data frame:

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

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

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

References

Sharp, Z.D., Gibbons, J.A., Maltsev, O., Atudorei, V., Pack, A., Sengupta, S., Shock, E.L. and Knauth, L.P. (2016). A calibration of the triple oxygen isotope fractionation in the SiO2-H2O system and applications to natural samples. Geochimica et Cosmochimica Acta, 186, 105-119. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1016/j.gca.2016.04.047")}

Examples

d17O_qz(temp = 10, d18O_H2O_VSMOW = 0) # Returns the data frame (length = 3)
d17O_qz(temp = 10, d18O_H2O_VSMOW = 0)[, 3] # Returns the D17O value

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