YbN vs. LaN/YbN {GCDkit}R Documentation

YbN vs LaN/YbN (Martin 1986) TTG/adakite

Description

Assigns data for the YbN vs. LaN/YbN diagram for adakite/TTG discrimination into Figaro template (list 'sheet') and appropriate values into 'x.data' and 'y.data'.

Usage

LaYb(ybrep=FALSE)

Arguments

ybrep

logical, should be missing Yb values replaced by Y/2.4?

Details

Diagram proposed by several authors for discriminating between adakitic (or TTG) and "ordinary" calc-alkaline rocks. The version used here is from Martin (1986).

Martin (1999) suggested that Yb (ppm) could be replaced by Y (ppm)/2.4. Notionally this could help with old data with missing values. However if Yb is missing La is also likely to be absent (or unreliable), so by default this replacement is not done; the user can access it by calling the function with ybrep=TRUE (not available from GUI).

Normalization values are La = 0.33 ppm, Yb = 0.22 ppm (Nakamura 1974).

Value

sheet

list with Figaro Style Sheet data

x.data

LaN/YbN or La/(Y/2.4)

y.data

YbN

Author(s)

Jean-François Moyen, jfmoyen@gmail.com

References

Martin H (1986) Effect of steeper Archean geothermal gradient on geochemistry of subduction-zone magmas. Geology 14: 753-756 doi: 10.1130/0091-7613(1986)14<753:EOSAGG>2.0.CO;2

Martin H (1999) Adakitic magmas: modern analogues of Archaean granitoids. Lithos 46: 411-429 doi: 10.1016/S0024-4937(98)00076-0

Nakamura N (1974) Determination of REE, Ba, Fe, Mg, Na and K in carbonaceous and ordinary chondrites. Geochim Cosmochim Acta 38: 757-775 doi: 10.1016/0016-7037(74)90149-5

See Also

figaro plotDiagram

Examples

    data(sazava)
    accessVar("sazava")
    
    # plot the diagram
    plotDiagram("LaYb",FALSE)

[Package GCDkit version 6.1 Index]