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 3.00 Index]