Hastie {GCDkit} | R Documentation |
Assigns data for Co vs. Th (ppm) diagram into Figaro template (list 'sheet
')
and appropriate values into 'x.data
' and 'y.data
'
Hastie()
Diagram in Co vs. Th space, proposed by Hastie et al. (2007) for subdivision of volcanic arc rocks. This is thought to be a more robust replacement for SiO2 vs. K2O plot of Peccerillo & Taylor (1976) for altered/weathered volcanic rocks. The decreasing Co concentrations are used as an index of fractionation (as a proxy for SiO2), the Th contents mimic those of K2O.
The following fields are defined:
Tholeiite Series
Calc-alkaline Series
High-K Calc-alkaline and Shoshonite Series
Rocks with composition falling beyond defined boundaries are labeled 'undefined' by the 'classify' function.
In addition, the diagram discriminates between the following rock types:
Abbreviation | Full name |
B | basalt |
BA/A | basaltic andesite and andesite |
D/R* | dacite and rhyolite* |
* latites and trachytes also fall in the D/R fields
sheet |
list with Figaro Style Sheet data |
x.data |
Co ppm |
y.data |
Th ppm |
Vojtech Janousek, vojtech.janousek@geology.cz
Hastie AR, Kerr AC, Pearce JA & Mitchell SF (2007) Classification of altered volcanic island arc rocks using immobile trace elements: development of the Th-Co discrimination diagram. J Pet 48: 2341-2357 doi: 10.1093/petrology/egm062
Peccerillo A & Taylor S R (1976) Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area, Northern Turkey. Contrib Mineral Petrol 58: 63-81 doi: 10.1007/BF00384745
#Within GCDkit, the plot is called using following auxiliary functions: #To Classify data stored in WR (Groups by diagram) classify("Hastie") #To plot data stored in WR or its subset (menu Classification) plotDiagram("Hastie", FALSE)