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,RCC=0.12)

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?

RCC

numeric; the 147Sm/144Nd ratio of the intermediate crustal reservoir for calculation of the two-stage Nd model ages

Details

Recalculates the Sr-Nd isotopic data and returns them in the numeric matrix init with the following columns (DM = Depleted Mantle):

Age (Ma) Age in Ma
87Sr/86Sri Initial 87Sr/86Sr ratios
143Nd/144Ndi Initial 143Nd/144Nd ratios
EpsNdi Initial ε(Nd) values
TDM Single-stage DM Nd model ages (Liew & Hofmann, 1988), function DMage
TDM.Gold Single-stage DM Nd model ages (Goldstein et al., 1988), function DMGage
TDM.2stg Two-stage DM 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

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 doi: 10.1016/0012-821X(84)90007-4

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 doi: 10.1007/BF00402106

Examples

# recalculation to 500 Ma
srnd(500)

# print the isotopic parameters currently in the memory
init

[Package GCDkit version 6.0 Index]