DebonCalc {GCDkit} | R Documentation |
Recalculates whole-rock analyses to Debon & Le Fort's values.
DebonCalc(millicats=milli)
millicats |
a numeric matrix with millications to be used for calculation. |
All the parameters are based on millications (1000 gram-atoms per 100 grams).
P = K - (Na + Ca); represents the proportion of K-feldspar to plagioclase
Q = Si / 3 - (K + Na + 2 * Ca / 3); corresponds to quartz content
A = Al - (K + Na + 2 Ca); expresses alumina saturation
B = Fe + Mg + Ti; proportional to the amount of dark minerals
F = 555 - (Q + B); represents the proportion of feldspars
(Na+K)
K/(Na+K)
Mg/(Fe+Mg); serves to distinguish between ferriferous and magnesian associations
Q(quartz)
B(dark m.)
F(feldsp)
The Q - B - F ternary plot expresses the balance of dark minerals, feldspars and quartz.
For details, see Debon & Le Fort (1983) or (1988).
results |
numerical matrix with the above specified results |
Vojtech Janousek, vojtech.janousek@geology.cz
Debon F & Le Fort P (1983) A chemical-mineralogical classification of common plutonic rocks and associations. Trans Roy Soc Edinb; Earth Sci 73: 135-149
Debon F & Le Fort P (1988) A cationic classification of common plutonic rocks and their magmatic associations: principles, method, applications. Bull Mineral 111: 493-511