IEEE Geoscience and Remote Sensing Magazine - June 2019 - 60

TABLE 3. THE INTERPRETED MINERALOGY AND SPECTRAL PARAMETERS OF SELECTED REFLECTANCE SPECTRA.

MINERAL

DEEPEST
ABSORPTION FEATURE

SECONDDEEPEST
ABSORPTION
FEATURE

ILLITE-
MUSCOVITE
COMPOSITION
AND
ORDERING

LOCATION*

COORDINATES
(COLUMN, ROW)

VISUAL

SPECTRAL

WAVELENGTH
(NM)

DEPTH§

WAVELENGTH
(NM)

CRYSTALLINITY

A

2, 197

Plagioclase

Illite

2,211

0.35

2,355

2.73

Al poor, poorly
ordered

B

76, 129

Quartz-
plagioclase

Muscovite

2,002

0.51

2,348

9.28

AI rich, well
ordered

C

102, 68

K-feldspar

Kaolinite

2,009

0.42

2,168

2.36

-

D

187, 118

Quartz-
plagioclase

Illite

2,205

0.11

2,255

0.99

Intermediate
AI content,
intermediate
ordering

E

203, 137

Tourmaline

Tourmaline

2,209

0.14

2,243

5.95

-

F

212, 160

Quartz-
plagioclase

Muscovite

2,208

0.46

2,348

5

Intermediate
AI content,
intermediate
ordering

G

147, 238

Chalcopyrite

Chalcopyrite

2,210

0.05

2,224

2.36

-

*Locations as in Figure 6 photo.
§Continuum-removed reflectance (zero to one).

Wavelength (nm)
(a)

40
0
2,

35
0
2,

30
0
2,

25
0
2,

10
0
2,

40
0
2,

20
0
2,

00
0
2,

80
0
1,

60
0
1,

40
0
1,

20
0

G: 147, 238 (Chalcopyrite)

20
0

F: 212, 160 (Muscovite)

2,

E: 203, 137 (Tourmaline)

15
0

D: 187, 118 (Illite)

2,

C: 102, 68 (Kaolinite)

1,

1,

00
0

Reflectance (Offset for Clarity)

B: 78, 129 (Muscovite)

Reflectance (Offset for Clarity)

A: 2, 197 (Illite)

Wavelength (nm)
(b)

FIGURE 7. (a) The reflectance spectra of the marked pixels in Figure 6 and Table 3. (b) A spectral zoom for the 2,100-2,400-nm range. The

y-axis tick interval is 0.2 reflectance units.
that from chalcopyrite, have the deepest absorption feature between approximately 2,200 and 2,215 nm [Figure 7(b)]. The deepest features of these minerals are related to the Al-OH bonds in illite, muscovite, and kaolinite
and the boron-OH bonds in tourmaline [12].
The wavelength image of the deepest absorption features
between 2,100 and 2,400 nm [Figure 8(a)] shows that the
wavelength positions are not evenly distributed throughout the rock. The absorption features of minerals in or near
the quartz veins have shorter wavelength positions (dark
60

shades of gray) than those in the wall rock (brighter shades
of gray). The histogram of wavelength position values contains a large and a small peak [Figure 8(b)]. The large, asymmetric peak near 2,205 nm is composed of pixel spectra
containing Al-OH and boron-OH absorption features. The
small peak near 2,245 nm is caused by a second boron-OH
feature at longer wavelengths.
The depth values of the deepest features in Figure 8(c)
are not evenly distributed. Deeper features occur in or
near quartz veins and in spots distributed throughout
IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE

JUNE 2019



IEEE Geoscience and Remote Sensing Magazine - June 2019

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