srnd {GCDkit} | R Documentation |
Age-corrects the Sr-Nd isotopic data to a given age; calculates initial ε(Nd) values and Nd model ages.
srnd(age="") initial(x,age,system="Nd") epsilon(WR,age) DMage(WR) DMGage(WR) DMLHage(WR, age)
age |
age in Ma: if empty, the user is prompted to enter a value |
x, WR |
isotopic data to be recalculated |
system |
character; which isotopic system Sr or Nd? |
Recalculates the Sr-Nd isotopic data and returns them in the numeric matrix
init
with the following columns:
Age (Ma) | Age in Ma |
87Sr/86Sri | Initial Sr isotopic ratios |
143Nd/144Ndi | Initial Nd isotopic ratios |
EpsNdi | Initial ε(Nd) values |
TDM | Single-stage depleted-mantle Nd model ages (Liew & Hofmann, 1988), function Image |
TDM.Gold | Single-stage depleted-mantle Nd model ages (Goldstein et al., 1988), function DMGage |
TDM.2stg | Two-stage depleted-mantle Nd model ages (Liew & Hofmann, 1988), function DMLHage |
init |
numeric matrix with the results |
SrNd.r
Vojtech Janousek, vojtech.janousek@geology.cz
Liew T C & Hofmann A W (1988) Precambrian crustal components, plutonic associations, plate environment of the Hercynian Fold Belt of Central Europe: indications from a Nd and Sr isotopic study. Contrib Mineral Petrol 98: 129-138
Goldstein S L, O'Nions R K & Hamilton P J (1984) A Sm-Nd isotopic study of atmospheric dusts and particulates from major river systems. Earth Planet Sci Lett 70: 221-236
# recalculation to 500 Ma srnd(500) # print the isotopic parameters currently in the memory init