Hastie {GCDkit}R Documentation

Co-Th diagram (Hastie et al. 2007)

Description

Assigns data for Co vs. Th (ppm) diagram into Figaro template (list 'sheet') and appropriate values into 'x.data' and 'y.data'

Usage

Hastie()

Details

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

Hastie.png

Value

sheet

list with Figaro Style Sheet data

x.data

Co ppm

y.data

Th ppm

Author(s)

Vojtech Janousek, vojtech.janousek@geology.cz

References

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

See Also

classify figaro plotDiagram

Examples

#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)

[Package GCDkit version 4.0 Index]