According to [R.sub.1]-[R.sub.2] discrimination diagram  and the classification diagram for plutonic rocks , the Chah Anjir intrusive rocks can be classified as diorite, monzodiorite (Figure 7(a)), and diorite to syenodiorite
, respectively (Figure 7(b)), with subalkaline to alkaline affinity (Figure 8(a)).
aIe (as in fire) ye io i iro syenodiorite
(a type of rock) tiring-irons
Figure 5 shows the extent of the favourable brucite-bearing zone in the Marble Canyon area of Texas, which developed in dolomitic rocks that surrounded an elliptically shaped intrusive complex, consisting of horn-blende-bearing granite, syenodiorite
and syenogabbro (Newman and Hoffman 1996).