srnd {GCDkit}R Documentation

Recalculations of the Sr-Nd isotopic data

Description

Age-corrects the Sr-Nd isotopic data to a given age; calculates initial ε(Nd) values and Nd model ages.

Usage

srnd(age="")
initial(x,age,system="Nd")
epsilon(WR,age)
DMage(WR)
DMGage(WR)
DMLHage(WR, age)

Arguments

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?

Details

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

Value

init

numeric matrix with the results

Plugin

SrNd.r

Author(s)

Vojtech Janousek, vojtech.janousek@geology.cz

References

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

Examples

# recalculation to 500 Ma
srnd(500)

# print the isotopic parameters currently in the memory
init

[Package GCDkit version 4.1 Index]