| calc_hf {detzrcr} | R Documentation |
Calculate hafnium values.
Description
Calculates the initial 176Hf/177Hf values, the initial epsilon hafnium values, the model age using the measured 176Lu/177Hf value and the model age assuming the parental magma was produced from an average continental crust (176Lu/177Hf = 0.015) that originally was derived from the depleted mantle (Griffin, 2004).
Usage
calc_hf(dat, constants)
Arguments
dat |
data.frame, list or matrix of hafnium values |
constants |
vector of constants which must be in the order decay constant 176Lu, 176/177Hf CHUR, 176Lu/177Hf CHUR, 176/177Hf DM, 176Lu/177Hf DM and 176Lu/177Hf value used for two-stage depleted mantle model age calculations |
References
Bouvier, A., Vervoort, J.D. & Patchett, P.J. 2008. The Lu-Hf and Sm-Nd isotopic composition of CHUR: Constraints from unequilibrated chondrites and implications for the bulk composition of terrestrial planets. Earth And Planetary Science Letters 273(1-2), 48-57.
Griffin, W., Belousova, E., Shee, S., Pearson, N. and O'Reilly, S. 2004. Archean crustal evolution in the northern Yilgam Craton: U-Pb and Hf-isotope evidence from detrital zircons. Precambrian Research, 231-282.
Soderlund, U., Patchett, J., Vervoort, J. & Isachsen, C. 2004. The Lu-176 decay constant determined by Lu-Hf and U-Pb isotope systematics of Precambrian mafic intrusions. Earth And Planetary Science Letters 219(3-4), 311-324.