Jung {GCDkit}R Documentation

Al/Ti thermometer for granitic rocks (Jung + Pfander 2007)

Description

This function estimates the temperature of a granitic magma based on measured Al2O3/TiO2 ratio and experimental constraints. The regression formulae were defined by Jung & Pfander (2007).

Usage

Jung(model = NULL, plot = TRUE)

Arguments

model

specification of the model

plot

logical; should be shown a Al2O3/TiO2 vs. CaO/Na2O plot?

Details

As shown by Sylvester (1998), the Al2O3/TiO2 ratio in the granitic magmas is temperature sensitive, decreasing with the increasing temperature of the crustal anatexis. This probably reflects an increasing instability of Ti-bearing phases with progressive crustal fusion.

Jung & Pfander (2007) compiled the available experimental data and defined a set of regression formulae (linear, power law and exponential) for several types of protoliths.

Any of the following models can be chosen: pelite melting, psammite melting, igneous rock melting, A-type granite melting, amphibolite melting after Rapp & Watson (1995) and amphibolite melting after Patino Douce & Beard (1995).

Optionally, also Al2O3/TiO2 vs. CaO/Na2O plot could be displayed with three secondary axes annotated by the calculated temperatures.

Jung.png

Value

Returns a matrix 'results' with the following columns:

Al2O3/TiO2

wt. % ratio of Al2O3/TiO2

T_Al/Ti.power.C

temperature in C, power law calibration

T_Al/Ti.exp.C

temperature in C, exponential calibration

T_Al/Ti.linear.C

temperature in C, linear calibration

T_Al/Ti.mean.C

mean temperature in C, based on the above three models

Plugin

Jung.r

Erratum

As pointed out by S. Jung (pers. com. 2009), in Table 1 of their original paper were printed wrongly several of the regression coefficients. These are:

Rock Model Jung and Pfander (2007) Corrected
A-type power law B = 0.992 B = 9.921
amphibolite (Rapp and Watson 1995) power law A = 2.82x10^3 A = 2.82x10^30

The function implements these corrected values.

Author(s)

Vojtech Janousek, vojtech.janousek@geology.cz

References

Jung S, Pfander J A (2007) Source composition and melting temperatures of orogenic granitoids: constraints from CaO/Na2O, Al2O3/TiO2 and accessory mineral saturation thermometry. Eur J Mineral 19: 859-870 doi: 10.1127/0935-1221/2007/0019-1774

Patino Douce A E, Beard J S (1995) Dehydration-melting of biotite gneiss and quartz amphibolite from 3 to 15 kbar. J Petrol 36: 707-738 doi: 10.1093/petrology/36.3.707

Rapp R P, Watson E B (1995) Dehydration melting of metabasalt at 8-32 kbar: implications for continental growth and crust-mantle recycling. J Petrol 36: 891-931 doi: 10.1093/petrology/36.4.891

Sylvester P J (1998) Post-collisional strongly peraluminous granites. Lithos 45: 29-44

doi: 10.1016/S0024-4937(98)00024-3

Examples

Jung()

Jung("A-type")

Jung("psammite",plot=FALSE)

[Package GCDkit version 4.1 Index]