Harris {GCDkit} | R Documentation |
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
'.
Harris()
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 | |
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.
sheet |
list with Figaro Style Sheet data |
x.data, y.data |
Th, Hf/3 and Ta in ppm recalculated into two dimensions |
Vojtech Janousek, vojtech.janousek@geology.cz
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
#plot the diagram plotDiagram("Harris", FALSE)