Table
T6. Minerals identified by X-ray diffraction analysis, Hole
1189B.
major (minor, "trace") minerals*
193-1189B-
1R-1,
0
Hammer
sample (for further explanation see "Variation of Alteration with
Depth" in "Hydrothermal Alteration," in the "Site
1189" chapter)
Pyrite
(chalcopyrite, illite, "sphalerite")
1R-1,
0-2
1
Semimassive
sulfide with sparse volcanic rock clasts
Anhydrite
(pyrite, chalcopyrite, gypsum)
1R-1,
20-30
1
Semimassive
sulfide with sparse volcanic rock clasts
Pyrite,
illite, chl/sm mixed-layer clays ("sphalerite")
1R-1,
30-31
2
Completely
altered, moderately vesicular, aphyric rock
Pyrite,
muscovite (chlorite)
2R-1,
11-20
3
Breccia
of completely altered volcanic rock clasts in a pyrite-anhydrite stockwork
matrix
Anhydrite
(gypsum, pyrite)
2R-1,
11-20
3
Breccia
of completely altered volcanic rock clasts in a pyrite-anhydrite stockwork
matrix
Gypsum,
pyrite (anhydrite, illite)
2R-1,
40-50
3
Pyrite-anhydrite
stockwork matrix
Pyrite,
anhydrite, quartz (gypsum)
2R-1,
40-50
3
Wallrock
sample
Pyrite
(illite, chlorite, kaolinite?, "smectite, quartz")
3R-1,
0-10
3
Breccia
of completely altered volcanic rock clasts in a pyrite-anhydrite stockwork
matrix
Quartz,
pyrite ("illite")
5R-1,
11-22
4
Breccia
of completely altered volcanic rock clasts in a pyrite-quartz matrix
Pyrite
(quartz, K-feldspar, illite, "chlorite")
6R-1,
23-33
5
Breccia
of completely altered volcanic rock clasts in quartz-hematite-pyrite
matrix
Quartz
(K-feldspar, plagioclase, pyrite, chlorite, "illite")
6R-1,
64-74
7
Completely
altered, aphyric volcanic rock
Quartz
(plagioclase, K-feldspar, pyrite, chlorite, "illite")
7R-1,
0-10
8
Breccia
of completely altered volcanic rock clasts
Quartz,
pyrite (K-feldspar, "illite")
8R-1,
7-9
9
Completely
altered, slightly vesicular, aphyric volcanic rock
K-feldspar
(pyrite, chlorite, illite, "illite-bearing mixed-layer clays")
10R-1,
26-27
13
Silica-clay
altered, aphyric volcanic rock
Quartz
(chlorite, K-feldspar, plagioclase, pyrite)
10R-1,
57-60
14
Silica-chlorite
altered, spherulitic, aphyric volcanic rock
Quartz
(chlorite, K-feldspar, anhydrite, pyrite, illite)
10R-1,
67-69
15
Completely
altered, silicified, massive, aphyric volcanic rock
Cristobalite,
plagioclase (K-feldspar, chlorite, "pyrite")
11R-1,
0-7
16
Breccia
of completely altered volcanic clasts
Quartz
(anhydrite, K-feldspar, chlorite, chl/sm mixed-layer clays, smectite,
illite, pyrite)
11R-1,
14-16
17
Jasperoidal
breccia of completely altered volcanic clasts
Quartz
(anhydrite, pyrite, "hematite")
11R-1,
19-20
18
Polymict
breccia of completely altered green volcanic clasts
Quartz
(K-feldspar, illite, chlorite, pyrite, "plagioclase")
11R-1,
63-65
19
Completely
altered, moderately vesicular, aphyric volcanic rock
Cristobalite,
plagioclase (quartz, "pyrite, chlorite, chl/sm mixed-layer clays,
smectite")
11R-2,
46-47
19
Completely
altered, moderately vesicular, aphyric volcanic rock
Cristobalite,
plagioclase (quartz, chlorite, "chl/sm mixed-layer clays, smectite")
11R-2,
89-91
19
Completely
altered, moderately vesicular, aphyric volcanic rock
Cristobalite,
plagioclase (quartz, smectite, "chlorite")
12R-1,
114-115
19
Completely
altered, moderately vesicular, aphyric volcanic rock
Plagioclase
(K-feldspar, quartz, chlorite, "illite, pyrite")
12R-2,
55-57
19
Completely
altered, moderately vesicular, aphyric volcanic rock
Cristobalite,
plagioclase (K-feldspar, quartz, chl/sm mixed-layer clays, "smectite,
illite")
13R-1,
22-24
20
Breccia
with completely altered volcanic clasts
Quartz
(plagioclase, pyrite, "chlorite")
13R-1,
34-36
20
Breccia
with completely altered volcanic clasts
Quartz
(pyrite, "barite")
13R-1,
52-54
21
Completely
altered, massive, aphyric volcanic rock
Quartz
(plagioclase, "chlorite, illite, pyrite")
14R-1,
0-10
22
Silicified
and mineralized, aphyric volcanic rock
Quartz
(pyrite, "illite")
14R-1,
57-58
23
Breccia
of completely altered volcanic rock fragments
Anhydrite,
quartz ("plagioclase, chlorite")
60
14R-1,
117-119
23
Breccia
of completely altered volcanic rock fragments
Anhydrite,
quartz (K-feldspar, plagioclase, chlorite)
50
14R-2,
10-11
23
Breccia
of completely altered volcanic rock fragments
Quartz
(plagioclase, pyrite, "chlorite")
14R-2,
29-35
24
Completely
altered, brecciated, silicified, aphyric volcanic rock
Quartz
(pyrite, plagioclase, K-feldspar)
15R-1,
16-17
25
Breccia
completely altered and silicified volcanic rock
Cristobalite,
plagioclase (K-feldspar, illite, chlorite, "smectite, chl/sm
mixed-layer clays, illite-bearing mixed-layer clays, pyrite")
15R-1,
128-129
25
Breccia
completely altered and silicified volcanic rock
Cristobalite,
plagioclase (K-feldspar, illite, chlorite, "smectite, chl/sm
mixed-layer clays, illite-bearing mixed-layer clays, pyrite")
15R-2,
61-64
26
Silicified,
sparsely vesicular, aphyric volcanic rock
Cristobalite,
plagioclase (K-feldspar, illite, "chlorite, smectite,
chl-sm-mixed-layer clays, pyrite")
16R-1,
36-39
26
Silicified,
sparsely vesicular, aphyric volcanic rock
Cristobalite,
plagioclase (K-feldspar, "illite, illite-bearing mixed-layer clays,
chlorite, smectite, chl/sm mixed-layer clays")
16R-1,
130-131
27
Very
highly altered, moderately vesicular, aphyric volcanic rock
Quartz
(plagioclase, pyrite, chl/sm mixed-layer clays)
16R-2,
9-10
27
Very
highly altered, moderately vesicular, aphyric volcanic rock
Quartz
(plagioclase, K-feldspar, chl/sm mixed-layer clays, "pyrite, illite")
17R-1,
19-20
28
Silicified,
moderately vesicular, aphyric volcanic rock
Quartz
(plagioclase, K-feldspar, pyrite)
17R-1,
60-63
30
Silicified,
flow-banded volcanic rock
Quartz
(plagioclase, K-feldspar, pyrite, chl/sm mixed-layer clays)
17R-1,
65-66
30
Silicified,
flow-banded volcanic rock
Quartz
(plagioclase, K-feldspar, pyrite, chl/sm mixed-layer clays)
17R-1,
96-98
31
Normal
graded, thinly bedded, volcaniclastic sandstone
Quartz
(plagioclase, pyrite, illite)
17R-1,
118-122
32
Flow-banded
silicified volcanic rock
Quartz
(plagioclase, K-feldspar, pyrite, chlorite, "illite, illite-bearing
mixed-layer clays, chl/sm mixed-layer clays")
18R-1,
24-25
33
Breccia
of completely altered, flow-banded volcanic rock
Cristobalite,
plagioclase (quartz, K-feldspar, illite, chlorite, "illite-bearing
mixed-layer clays, pyrite")
18R-1,
70-71
34
Breccia
of completely altered flow-banded volcanic rock
Cristobalite,
plagioclase (quartz, K-feldspar, pyrite, illite, chlorite, chl/sm
mixed-layer clays, "illite-bearing mixed-layer clays, talc?")
18R-1,
107-108
34
Breccia
of completely altered flow-banded volcanic rock
Cristobalite,
plagioclase (quartz, K-feldspar, pyrite, illite, chl/sm mixed-layer clays,
"smectite, illite-bearing mixed-layer clays, actinolite?")
18R-2,
23-24
34
Breccia
of completely altered flow-banded volcanic rock
Cristobalite,
plagioclase (quartz, K-feldspar, pyrite, illite, chlorite, chl/sm
mixed-layer clays, "smectite, illite-bearing mixed-layer clays,
actinolite?")
18R-2,
42-43
35
Completely
altered, clast-supported polymict breccia
Quartz
(plagioclase, K-feldspar, chlorite, "illite, pyrite")
Notes: chl/sm mixed-layer clays = chlorite/smectite-mixed-layer clays. * = the terms major, minor, and trace are applied to X-ray diffraction (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 for cristobalite-dominated assemblages.