Table
T9. Minerals identified by X-ray diffraction analysis, Hole 1188F.
193-1188F-
1Z-1,
4-5
27
Completely
altered massive rock
Quartz
(anhydrite, illite, "pyrite")
1Z-1,
29-30
27
Completely
altered massive rock
Quartz
(anhydrite, illite, pyrite)
1Z-1,
87-88
27
Completely
altered massive rock
Quartz
(anhydrite, illite, pyrite)
1Z-2,
4-5
27
Completely
altered massive rock
Quartz
(anhydrite, illite)
1Z-2,
37-38
27
Completely
altered massive rock
Quartz
(anhydrite, illite, "pyrite")
1Z-3,
20-21
27
Completely
altered massive rock
Quartz
(anhydrite, illite)
1Z-3,
34-35
27
Completely
altered massive rock
Quartz
(anhydrite, illite)
1Z-3,
35-36
27
Completely
altered massive rock (including anhydrite vein)
Quartz
(anhydrite, illite)
1Z-3,
85-86
28
Completely
altered, silicified and green clay-bearing massive rock
Quartz
(chlorite, illite, anhydrite, pyrite)
1Z-3,
106-108
28
Completely
altered, silicified and green clay-bearing massive rock
Quartz
(anhydrite, illite, pyrite, "chlorite")
1Z-4,
90-91
28
Completely
altered, silicified and green clay-bearing massive rock
Quartz
(anhydrite, illite, "pyrite")
2Z-1,
44-45
29
Completely
altered, silicified aphyric massive rock
Quartz
(anhydrite, illite, pyrite)
2Z-1,
73-74
29
Completely
altered, silicified aphyric massive rock
Quartz,
calcite (anhydrite, illite, "kaolinite?")
3Z-1,
6-7
29
Completely
altered, silicified aphyric massive rock
Quartz
(illite, anhydrite, "pyrite")
3Z-2,
40-41
30
Completely
altered, brecciated, clay-rich rock
Quartz
(anhydrite, illite, pyrite)
3Z-2,
144-145
30
Completely
altered, brecciated, clay-rich rock
Quartz
(anhydrite, chlorite, illite)
3Z-2,
150-151
30
Completely
altered, brecciated, clay-rich rock
Quartz
(anhydrite, illite, pyrite)
6Z-1,
20-21
30
Completely
altered, brecciated, clay-rich rock
Quartz
(anhydrite, illite, chlorite, pyrite)
6Z-1,
46-47
31
Highly
altered volcanic rock
Cristobalite,
plagioclase (chlorite, pyrite)
6Z-1,
77-78
32
Completely
altered, silicified massive aphyric rock
Quartz
(anhydrite, illite)
6Z-2,
47-48
33
Silicified
volcanic fragments embedded in soft gray clay
Quartz
(illite, pyrite, anhydrite)
7Z-1,
41-45
34
Silicified
massive aphyric rock
Quartz
(anhydrite, illite, "pyrite")
7Z-1,
104-107
35
Silicified,
plagioclase-phyric rock
Quartz
(anhydrite, illite)
7Z-2,
3-6
35
Silicified,
plagioclase-phyric rock
Quartz
(anhydrite, illite, "pyrite")
8Z-1,
68-71
36
Silicified
massive aphyric rock
Quartz
(anhydrite, illite)
9Z-1,
9-12
37
Silicified
clastic rock
Quartz
(anhydrite, illite)
11G-1,
53-56
38
Silicified
massive aphyric rock
Quartz
(anhydrite, illite, "pyrite")
11G-1,
138-141
39
Silicified
plagioclase-phyric, slightly vesicular volcanic rock
Quartz
(anhydrite, pyrite, illite)
13Z-1,
118-121
41
Silicified
plagioclase-phyric volcanic rock
Quartz,
anhydrite, pyrite, illite)
13Z-2,
51-55
41
Silicified
plagioclase-phyric volcanic rock
Quartz
(anhydrite, illite, "pyrite")
13Z-2,
55-70
41
Silicified
plagioclase-phyric volcanic rock
Quartz
(anhydrite, pyrite, illite, "chlorite")
14Z-1,
134-139
41
Silicified
plagioclase-phyric volcanic rock
Quartz
(anhydrite, brittle mica?, pyrite)
15Z-1,
66-69
42
Silicified,
aphyric rock
Quartz
(anhydrite, brittle mica?, pyrite)
15Z-1,
90-95
42
Silicified,
aphyric rock
Quartz
(anhydrite, illite, brittle mica?, pyrite)
16Z-1,
41-43
44
Silicified,
brecciated, flow banded, aphyric rock
Quartz
(illite, pyrite, "anhydrite")
16Z-1,
139-141
44
Silicified,
brecciated, flow banded, aphyric rock
Quartz
(pyrite, illite, brittle mica?, "anhydrite")
22Z-1,
63-67
46
Completely
altered, silicified, aphyric, volcanic rock
Quartz
(anhydrite, pyrite, illite, chlorite)
23Z-1,
25-26
48
White
halo of Piece 3
Quartz
(anhydrite, illite, pyrite, chlorite)
23Z-1,
26-27
48
Gray
kernel of Piece 3
Quartz
(chlorite, illite, pyrite, "anhydrite, smectite")
23Z-1,
102-103
49
Silicified,
green clay-bearing aphyric volcanic rock
Quartz
(anhydrite, chlorite, illite, "pyrite")
23Z-2,
13-14
49
White
crust of Piece 2 (anhydrite vein)
Anhydrite
("quartz")
23Z-2,
24-25
49
Silicified,
green clay-bearing, aphyric volcanic rock
Quartz
(anhydrite, chlorite, illite, pyrite)
23Z-2,
45-46
49
Silicified,
green clay-bearing, aphyric volcanic rock
Quartz
(anhydrite, chlorite, illite, "pyrite")
25Z-1,
24-26
49
Silicified,
green clay-bearing, aphyric volcanic rock
Quartz,
plagioclase (chlorite, pyrite, "anhydrite")
26Z-1,
20-23
49
Silicified,
green clay-bearing, aphyric volcanic rock
Quartz
(anhydrite, pyrite, illite, chlorite, chl/sm mixed-layer clays, "smectite")
26Z-2,
60-61
50
Silicified,
plagioclase-phyric volcanic rock
Quartz
(chlorite, illite, anhydrite, pyrite)
27Z-1,
22-23
50
Silicified,
plagioclase-phyric volcanic rock
Quartz
(anhydrite, pyrite, plagioclase, illite, chlorite)
30Z-1,
5-7
51
Completely
altered, variably silicified breccia
Quartz
(plagioclase, illite, chlorite, "pyrite")
31Z-1,
1-3
52
Silicified,
slightly plagioclase-magnetite phyric volcanic rock
Quartz,
plagioclase (chlorite, magnetite, pyrite, "anhydrite")
31Z-1,
39-42
53
Completely
altered, variably silicified breccia
Quartz
(pyrite, illite, chlorite, "anhydrite")
34Z-1,
22-23
54
Completely
altered aphyric volcanic rock
Quartz
(anhydrite, illite, pyrite, "plagioclase")
34Z-1,
27-28
55
Completely
altered volcanic rock and breccia with variable black, late-stage
magnetite-bearing alteration
Magnetite
(di- and trioctahedral illite, quartz, plagioclase, chlorite, pyrite, Fe
spinel, "brucite")
34Z-1,
40-41
55
Completely
altered volcanic rock and breccia with variable black, late-stage
magnetite-bearing alteration
Plagioclase,
quartz (illite, chlorite, pyrite, magnetite, "illite-bearing mixed
layer clays")
34Z-1,
89-90
56
Completely
altered and variably silicified volcanic rock breccia
Quartz
(chlorite, illite, "anhydrite, pyrite")
35Z-1,
5-6
57
Silicified,
sparsely vesicular, aphyric, massive volcanic rock
Quartz
(plagioclase, pyrite, magnetite, illite, "anhydrite, chlorite")
35Z-1,
46-48
57
Silicified,
sparsely vesicular, aphyric, massive volcanic rock
Quartz
(plagioclase, pyrite, chlorite, "illite, anhydrite, magnetite")
35Z-1,
140-141
57
Silicified,
sparsely vesicular, aphyric, massive volcanic rock
Quartz
(anhydrite, illite, "pyrite, chlorite")
35Z-2,
48-49
57
Silicified,
sparsely vesicular, aphyric, massive volcanic rock
Quartz
(anhydrite, illite, pyrite, "plagioclase")
37Z-1,
6-7
57
Silicified,
sparsely vesicular, aphyric, massive volcanic rock
Quartz,
plagioclase (illite, "anhydrite, pyrite, magnetite, chlorite")
37Z-2,
18-20
57
Silicified,
sparsely vesicular, aphyric, massive volcanic rock
Quartz
(plagioclase, illite, pyrite, anhydrite, chlorite)
37Z-2,
31-33
58
Magnetite-rich,
clastic rock
Plagioclase
(magnetite, illite, alunite, Fe spinel, chlorite, pyrite, brucite)
37Z-2,
65-68
59
Silicified,
locally magnetite-bearing, aphyric volcanic rock
Quartz
(plagioclase, anhydrite, magnetite, "illite, chlorite, pyrite")
38Z-2,
90-92
61
Completely
altered, aphyric, amygular volcanic rock
Quartz,
plagioclase (illite, chlorite, anhydrite, "pyrite, magnetite")
39Z-1,
7-8
62
Completely
altered, sparsely plagioclase-phyric volcanic rock
Quartz
(anhydrite, illite, "chlorite, plagioclase, pyrite")
39Z-1,
41-43
62
Completely
altered, sparsely plagioclase-phyric volcanic rock
Quartz
(anhydrite, illite, chlorite, "pyrite")
39Z-2,
18-19
64
Completely
altered, aphyric volcanic rock
Quartz
(anhydrite, illite, chlorite, pyrite, plagioclase, illite-bearing mixed
layer clays)
40Z-1,
3-5
65
Completely
altered, magnetite-enriched, vesicular volcanic rock
Quartz
(plagioclase, anhydrite, illite, chlorite, pyrite, magnetite)
40Z-1,
36-38
66
Completely
altered, sparsely plagioclase-phyric volcanic rock
Quartz
(anhydrite, illite, pyrite, "plagioclase, chlorite")
40Z-2,
35-36
67
Completely
altered, clastic-textured volcanic rock
Quartz
(anhydrite, illite, pyrite, "plagioclase, chlorite")
41Z-1,
46-47
69
Completely
altered, aphyric, amygdular volcanic rock
Quartz
(plagioclase, pyrite, illite, chlorite, "magnetite, anhydrite")
41Z-2,
7-10
69
Completely
altered, aphyric, amygdular volcanic rock
Quartz
(plagioclase, pyrite, illite, chlorite, "magnetite, anhydrite")
42Z-1,
30-31
70
Completely
altered, aphyric, sparsely amygdaloidal volcanic rock
Quartz
(anhydrite, illite, "pyrite")
42Z-1,
72-74
70
Completely
altered, aphyric, sparsely amygdaloidal volcanic rock
Quartz
(anhydrite, chlorite, illite, pyrite, "plagioclase")
43Z-1,
6-8
71
Completely
altered, aphyric, sparsely vesicular volcanic rock
Quartz
(illite, pyrite, chlorite, "anhydrite, plagioclase")
43Z-1,
67-69
72
Completely
altered, magnetite-bearing, aphyric volcanic rock
Quartz,
plagioclase (chlorite, pyrite, magnetite, "anhydrite")
43Z-1,
90-91
72
Completely
altered, magnetite-bearing, aphyric volcanic rock
Quartz,
plagioclase (chlorite, anhydrite, "pyrite, magnetite")
44Z-1,
85-86
72
Completely
altered, magnetite-bearing, aphyric volcanic rock
Quartz,
plagioclase (chlorite, anhydrite, "pyrite, magnetite")
Notes: XRD = X-ray diffraction. * = the terms major, minor, and trace are applied to XRD analyses as explained in "Hydrothermal Alteration" in the "Explanatory Notes" chapter and do not imply quantitative abundances. Anhydrite abundances are estimated for quartz-bearing assemblages as described in "Hydrothermal Alteration" in the "Explanatory Notes" chapter. This procedure probably results in an overestimation of the anhydrite abundance because the effect of clays is ignored. In the absence of a suitable calibration, it is not possible to estimate anhydrite abundance from XRD spectra. Chl/sm mixed-layer clays = chlorite/smectite-mixed layer clays.