Organic Preservation of Biopolymers in Fossil Leaves - Biopolymers: A Molecular Paleontology Approach - page 64

a

0.7

Diatomite

1095 cm -1

0.6

0.5

0.4

0.3

0.2

798 cm -1

0.1

0

4000 3800 3600 3400 3200 3000 2800 2600 2400 2200 2000 1800 1600 1400 1200 1000 800 600

b

2

Silicate contamination

Populus alba specimen 1

1.8

1.6

1.4

ν OH

3400 cm -1

ν CH aliphatic

1.2

2925 cm -1
2850 cm -1

C=C

1600 cm -1

1

C=O

1700 cm -1

0.8

0.6

0.4

4000 3800 3600 3400 3200 3000 2800 2600 2400 2200 2000 1800 1600 1400 1200 1000 800 600

c

2

Ethers

Castanea vesca specimen 1

1.8

1090 cm -1

1200 cm -1

1.6

δ CH aliphatic

1500 cm -1
1450 cm

1.4

CH aliphat ic

ν OH ν

3400 cm -1

-1

1.2

2925 cm -1

C=C

1600 cm -1

1

2850 cm -1

0.8

C=O

1705 cm -1

CH Aromatic

0.6 γ

0.4

0.2

0

4000 3800 3600 3400 3200 3000 2800 2600 2400 2200 2000 1800 1600 1400 1200 1000 800 600

(cm -1 )

Wavenumbers

Fig. 3.12 FTIR spectra of fossil leaves and diatomite. ( a ) Global FTIR Silica (Diatomite), ( b ) Global
FTIR, Populus alba sp 1, ( c )micro-FTIR, Castaneavesca sp1. For details see Table 3.2