Major, minor, and trace element geochemistry
The granitic samples obtained of the Spirit Mountain batholith record an
almost continuous chemical gradation from 61 to 79 wt%
SiO2 (Fig. 4 and 5). The variation of any particular
major element reaches a minimum at around 72 – 74 wt%
SiO2 and increases as wt% SiO2decreases. At SiO2 contents greater than 72 – 74 wt%,
the spread in oxide concentrations tends to either cluster or spread
again (Fig. 4). Similar trends occur in minor and trace elements when
plotted as a function of wt% SiO2 (Fig. 4 and 5). The
samples highlighted in yellow in Fig. 2b are plotted in yellow in Fig. 4
and 5 and define a near linear trend in major, minor, and trace element
space.