AVERAGE MAJOR-ELEMENT COMPOSITIONS
OF CLARNO ROCKS IN THE MITCHELL AREA  

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SiO2

Al2O3

FeO

CaO

MgO

K2O

Na2O

TiO2

Sum

Marshall Butte Group

45.5

12.0

10.3

13.0

11.3

1.15

3.5

2.19

98.9 (22)

Hudspeth Mill Group

50.4

12.7

8.4

10.0

12.1

2.54

2.1

0.96

99.1 (16)

Minette Lamprophyres

45.9

10.5

10.8

11.4

7.7

2.17

2.0

4.34

94.7 (9)

Mafic Dike System

52.6

14.0

13.9

8.3

3.9

0.86

3.0

3.03

99.5 (16)

Clarno Basalts

50.4

15.1

10.4

10.3

7.8

0.71

2.7

1.39

98.8 (36)

Clarno Bas. Andesites

55.2

16.4

8.5

8.0

5.2

0.98

3.3

1.15

98.8 (68)

Clarno Andesites

59.9

16.6

7.1

6.2

3.0

1.33

3.9

1.05

99.0 (180)

Clarno Dacites

64.9

16.2

5.2

4.4

1.6

1.85

4.3

0.79

99.2 (79)

Clarno Rhyolites

74.3

14.3

2.2

1.5

0.3

3.25

3.6

0.25

99.7 (41)

 


 

CALCULATED NORMS OF CLARNO ROCKS
IN THE MITCHELL AREA

 

Qtz

An

Ab

Or

Neph

Diop

Hyp

Oliv

Ilmen

Mag

Marshall Butte Group

 

13.8

1.5

6.86

15.35

41.41

15.19

4.20

1.68

Hudspeth Mill Group

 

17.9

15.3

15.13

1.36

25.80

21.30

1.84

1.36

Minnett Lamprophyres

 

13.9

13.8

13.53

2.21

36.96

9.07

8.68

1.83

Mafic Dike System

4.76

22.3

25.5

5.08

16.02

18.38

5.77

2.25

Clarno Basalts

27.28

23.10

4.25

19.94

13.19

7.87

2.68

1.70

Clarno Bas. Andesites

4.97

27.38

28.26

5.85

10.55

19.40

2.20

1.39

Clarno Andesites

11.72

24.08

33.25

7.92

5.78

14.08

2.01

1.16

Clarno Dacites

18.56

19.57

36.64

10.99

2.03

9.84

1.52

0.84

Clarno Rhyolites

35.99

7.44

30.55

19.27

3.78

0.47

0.36

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ANALYSES OF CLARNO ROCKS