hfIso | R Documentation |
Main function that age-corrects the in-situ zircon Hf isotopic data to a given age; calculates initial ε(Hf) values, single-stage CHUR, as well as single- and two-stage depleted-mantle (DM) Nd model ages.
hfIso(age = NULL, GUI = FALSE) hfInitial(age, x = WR) hfEpsilon(age, x = WR, digits = 2) hfCHURage(x = WR, digits = 3) hfDMage(x = WR, digits = 3) hfDM2stgAge(x = WR, age = NULL, RCC = R.crust, digits = 3)
age |
age in Ma |
GUI |
logical; is the function called from GUI? |
x |
numeric matrix with isotopic data to be recalculated |
digits |
integer; the precision of the result |
RCC |
numeric; the 176Lu/177Hf ratio of the intermediate crustal reservoir used for calculation of the two-stage Hf model ages |
Recalculates the Hf isotopic data and returns the numeric matrix
Hfinit
with the following columns (DM = Depleted Mantle):
Menu item | Explanation |
176Hf/177Hfi | Initial Hf isotopic ratios |
EpsHfi | Initial ε(Hf) values |
HfTCHUR.1stg | Single-stage CHUR Hf model ages |
HfTDM.1stg | Single-stage DM Hf model ages |
HfTDM.2stg | Two-stage DM Hf model ages |
If the parameter 'age
' is provided upon the call to the main function hfIso()
,
the same value is used for all the samples. On the other hand, if the parameter
'age
' is empty, and no column named 'Age
' is found in the dataset,
the user is prompted to enter a value from a dialogue.
For the remaining functions, if the argument 'age
' is empty, it is taken from the
value assigned upon loading the dataset.
The main parameters for Hf isotopic data recalculations are set from the graphical interface, triggered by the function 'hfOptions'. These include the 176Lu decay constant, 176Lu/177Hf and 176Hf/177Hf ratios of the CHUR and Depleted Mantle reservoirs, and 176Lu/177Hf ratio of the intermediate crustal reservoir used for calculation of the two-stage Hf model ages.
For hfIso
:
Hfinit |
numeric matrix with the results |
For all other functions:
results |
numeric matrix, or vector, with the results |
Hf.r
Vojtěch Janoušek, vojtech.janousek@geology.cz
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hfOptions, hfAgeEps, hfAgeEps2, hfStripplot, hfBoxplot, hfViolinplot, hfAddResults,
hfSaveResults
sampleDataset("khantaishir_Hf") # Recalculation using the age information from the file; # this is done automatically upon loading a new data set; # column named 'Age' is present in the datafile hfIso() # Using the same age for all samples hfIso(500) hfInitial(346) out <- cbind(hfEpsilon(0), hfEpsilon(346)) colnames(out) <- c(0, 346) print(out) # Model ages hfCHURage() hfDMage() hfDM2stgAge() # default RCC (crustal 176Lu/177Hf) value is taken from the system (variable 'R.crust') hfDM2stgAge(age = 300) # basaltic RCC (Lancaster et al. 2011) is assumed here hfDM2stgAge(RCC = 0.022)