# d17O_qz: Triple oxygen isotope values of quartz In isogeochem: Tools for Stable Isotope Geochemistry

 d17O_qz R Documentation

## 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.