Table 26

Major and trace element compositions, and normative and modal mineral assemblages of a sample with phaneritic texture compared to a sample with porphyritic texture. The two samples are nearly identical in chemical composition despite having different textures.


DDH 331-218.5	DDH 340-166.1

Major Oxides

Sample	331-218.5	340-166.1
Texture	Porphyry	Phanerite
SiO2	60.1	60.1
TiO2	0.5	0.5
Al2O3	18.2	18.1
Fe2O3	3.1	3.5
FeO	1.4	1.1
MnO	0.12	0.1
MgO	1.1	1.3
CaO	6.3	6.4
Na2O	3.9	4.2
K2O	4.1	3.5
P2O5	0.22	0.25
Cr2O3	< 0.1	< 0.01
H2O+	0.13	0.26
H2O	<0.05	0.12
S.G	2.7	2.7

Norm

Sample	331-218.5	340-166.1
Q	8.9	9.6
An	20	20.5
Ab	33.3	35.2
Or	24.3	20.6
C	0	0
Z	0.1	0.1
Di	6.2	7.1
Wo	1.2	0.5
Mt	3.4	2.2
Hm	0.8	1.9
Ilm	1	1
Ap	0.5	0.6

Trace Elements

Sample	331-218.5	340-166.1
Sc	4.97	5.96
Cr	66.3	75.1
Co	4.1	4.07
Ni	22	27
Rb	93	96
Cs	1.14	0.47
Sr	1040	1060
Ba	1170	889
La	38.1	48.9
Ce	82.4	87.5
Nd	37	35.1
Sm	7.29	7.16
Eu	2.13	1.9
Tb	0.85	0.72
Yb	2.24	2.2
Lu	0.29	0.29
Hf	5.25	5.26
Ta	0.55	0.59
Th	7.76	8.19
U	1.7	2.4

Mode

Sample	331-218.5	340-166.1
Quartz	3.3	8.2
Plagioclase	45.7	61.7
K-Feldspar	0.6	15.7
Groundmass	38.1	0
Biotite	0.5	1.7
Pyroxene	4.1	8.7
Hornblende	0.1	0
Opaques	2.7	2.3
Sphene	0.3	0.8
Apatite	0.2	0.3