Harris {GCDkit}R Documentation

Harris et al. (1986) Hf-Rb/30-Ta*3

Description

Assigns data for the Hf-Rb/30-Ta*3 ternary diagram of Harris et al. (1986) into Figaro template (list 'sheet') and appropriate values into 'x.data' and 'y.data'.

Usage

    Harris()

Details

Triangular diagram with apices Hf, Rb/30 and Ta*3, proposed by Harris et al. (1986) for classification of collisional granites.

Following fields are defined:

VA Volcanic-Arc granites (Group 1, VA)
WP Within-Plate granites (Group 4, WP)
Group 2
Group 3

Harris.png

Quoting from their abstract:

(i) Group 1 - Pre-collision calc-alkaline (volcanic-arc) intrusions which are mostly derived from mantle modified by a subduction component and which are characterized by selective enrichments in LIL elements.

(ii) Group 2 - Syn-collision peraluminous intrusions (leucogranies) which may be derived from the hydrated bases of continental thrust sheets and which are characterized by high Rb/Zr and Ta/Nb and low K/Rb ratios.

(iii) Group 3 - Late or post-collision calc-alkaline intrusions which may be derived from a mantle source but undergo extensive crustal contamination and can only be distinguished from volcanic-arc intrusions by their higher ratios of Ta/Hf and Ta/Zr.

(iv) Group 4 - Post-collision alkaline intrusions which may be derived from mantle lithosphere beneath the collision zones and which carry high concentrations of both LIL and HFS elements.

Value

sheet

list with Figaro Style Sheet data

x.data, y.data

Th, Hf/3 and Ta in ppm recalculated into two dimensions

Author(s)

Vojtech Janousek, vojtech.janousek@geology.cz

References

Harris N B W, Pearce J A, Tindle A G (1986) Geochemical characteristics of collision-zone magmatism. In: Coward M P, Ries A C (eds) Collision Tectonics. Geological Society London Special Publication 19, pp 67-81

See Also

figaro plotDiagram

Examples

#plot the diagram
plotDiagram("Harris", FALSE)

[Package GCDkit version 4.0 Index]